Interleukin 15: Difference between revisions

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{{protein
{{Infobox_gene}}
| Name = Interleukin 15
| caption =
| image =
| width =
| HGNCid = 5977
| Symbol = IL15
| AltSymbols = 
| EntrezGene = 3600
| OMIM = 600554
| RefSeq = NP_751914
| UniProt = P40933
| PDB =
| ECnumber =
| Chromosome = 4
| Arm = q
| Band = 31
| LocusSupplementaryData =
}}


'''Interleukin-15''' (IL-15) is a [[cytokine]] with structural similarity to Interleukin-2 (IL-2).  Like IL-2, IL-15 binds to and signals through a complex composed of IL-2/IL-15 receptor beta chain ([[IL-2 receptor|CD122]]) and the [[common gamma chain]] (gamma-C, CD132).  IL-15 is secreted by [[phagocytes|mononuclear phagocytes]] (and some other cells) following infection by [[virus]](es).  This cytokine induces [[cell proliferation]] of [[natural killer cell]]s; cells of the [[innate immune system]] whose principal role is to kill virally infected cells.


==Overview==
== Expression ==
'''Interleukin 15''' (IL-15) is a [[cytokine]] with structural similarity to [[IL-2]] that is secreted by [[phagocytes|mononuclear phagocytes]] (and some other cells) following infection by [[virus]](es).  This cytokine induces [[cell proliferation]] of [[natural killer cells]]; cells of the [[innate immune system]] whose principal role is to kill virally infected cells.


Maintenance of memory cells does not appear to require persistence of the original antigen; instead, survival signals for memory lymphocytes are provided by cytokines such as IL-15.
IL-15 was discovered in 1994 by two different laboratories, and characterized as [[T cell]] [[growth factor]].<ref name="Steel_2012"/> Together with [[Interleukin-2]] ([[Interleukin 2|IL-2]]), [[Interleukin-4]] ([[Interleukin-4|IL-4]]), [[Interleukin-7]] ([[Interleukin-7|IL-7]]), [[Interleukin-9]] ([[Interleukin-9|IL-9]]), [[granulocyte colony-stimulating factor]] ([[G-CSF]]), and [[granulocyte-macrophage colony-stimulating factor]] ([[GM-CSF]]), IL-15 belongs to the four α-helix bundle family of [[cytokine]].<ref name="Steel_2012"/><ref name="pmid21074481">{{cite journal |vauthors=Di Sabatino A, Calarota SA, Vidali F, Macdonald TT, Corazza GR | title = Role of IL-15 in immune-mediated and infectious diseases | journal = Cytokine Growth Factor Rev. | volume = 22 | issue = 1 | pages = 19–33 |date=February 2011 | pmid = 21074481 | doi = 10.1016/j.cytogfr.2010.09.003 }}</ref>


In transgenic mice that have the IL-15 receptor alpha (IL-15Ralpha) gene knocked out, [[natural killer cells]] cells do not develop.
IL-15 is constitutively expressed by a large number of [[cell types]] and [[tissue (biology)|tissue]]s, including [[monocytes]], [[macrophages]], [[dendritic cells]] ([[Dendritic cell|DC]]), [[keratinocytes]], [[fibroblasts]] and [[nerve cells]].<ref name="pmid8178155">{{cite journal |vauthors=Grabstein KH, Eisenman J, Shanebeck K, Rauch C, Srinivasan S, Fung V, Beers C, Richardson J, Schoenborn MA, Ahdieh M | title = Cloning of a T cell growth factor that interacts with the beta chain of the interleukin-2 receptor | journal = Science | volume = 264 | issue = 5161 | pages = 965–8 |date=May 1994 | pmid = 8178155 | doi = 10.1126/science.8178155 }}</ref> As a pleiotropic cytokine, it plays an important role in [[innate]] and [[adaptive immunity]].<ref name="pmid12401478">{{cite journal |vauthors=Lodolce JP, Burkett PR, Koka RM, Boone DL, Ma A | title = Regulation of lymphoid homeostasis by interleukin-15 | journal = Cytokine Growth Factor Rev. | volume = 13 | issue = 6 | pages = 429–39 |date=December 2002 | pmid = 12401478 | doi = 10.1016/S1359-6101(02)00029-1}}</ref>


In people with history of acute infectious mononucleosis (the syndrome associated with primary Epstein-Barr virus infection), IL-15R expressing lymphocytes are not detected--even 14 years after infection.
== Gene ==


IL-15 is 14-15 kDa [[glycoprotein]] encoded by the 34 kb region of [[chromosome]] 4q31 in humans, and at the central region of [[chromosome 8]] in [[mice]].<ref name="pmid10358752">{{cite journal |vauthors=Waldmann TA, Tagaya Y | title = The multifaceted regulation of interleukin-15 expression and the role of this cytokine in NK cell differentiation and host response to intracellular pathogens | journal = Annu. Rev. Immunol. | volume = 17 | issue = | pages = 19–49 | year = 1999 | pmid = 10358752 | doi = 10.1146/annurev.immunol.17.1.19 }}</ref> The human IL-15 [[gene]] comprises nine [[exons]] (1 - 8 and 4A) and eight [[introns]], four of which (exons 5 through 8) code for the mature [[protein]] (Figure 1).<ref name="Steel_2012">{{cite journal |vauthors=Steel JC, Waldmann TA, Morris JC | title = Interleukin-15 biology and its therapeutic implications in cancer | journal = Trends Pharmacol. Sci. | volume = 33 | issue = 1 | pages = 35–41 |date=January 2012 | pmid = 22032984 | doi = 10.1016/j.tips.2011.09.004 | pmc = 3327885}}</ref>[[File:Gen IL-15.jpg|thumb|'''Figure 1.'''  IL-15 is 14-15 kDa glycoprotein encoded by the 34 kb region on chromosome 4q31, and by central region of chromosome 8 in mice. The human IL-15 gene comprises nine exons (1 - 8 and 4A) and eight introns, four of which (exons 5 through 8) code for the mature protein.]]


Two alternatively spliced transcript variants of this [[gene]] encoding the same [[protein]] have been reported.<ref name = "entrez"/> The originally identified [[isoform]], with long [[signal peptide]] of 48 [[amino acids]] (IL-15 LSP) consisted of a 316 bp 5’-untranslated region (UTR), 486 bp [[coding sequence]] and the C-terminus 400 bp 3’-UTR region. The other isoform (IL-15 SSP) has a short signal peptide of 21 amino acids encoded by [[exons]] 4A and 5.<ref name="Steel_2012"/> Both isoforms shared 11 amino acids between  [[signal peptide|signal sequence]]s of the N-terminus.<ref name="pmid9405632">{{cite journal |vauthors=Tagaya Y, Kurys G, Thies TA, Losi JM, Azimi N, Hanover JA, Bamford RN, Waldmann TA | title = Generation of secretable and nonsecretable interleukin 15 isoforms through alternate usage of signal peptides | journal = Proc. Natl. Acad. Sci. U.S.A. | volume = 94 | issue = 26 | pages = 14444–9 |date=December 1997 | pmid = 9405632 | pmc = 25016 | doi = 10.1073/pnas.94.26.14444}}</ref> Although both isoforms produce the same mature protein, they differ in their [[protein targeting|cellular trafficking]].<ref name="Steel_2012"/> IL-15 LSP isoform was identified in [[Golgi apparatus]] [GC], early [[endosomes]] and in the [[endoplasmic reticulum]] (ER). It exists in two forms, secreted and membrane-bound particularly on [[dendritic cells]]. On the other hand, IL-15 SSP isoform is not secreted and it appears to be restricted to the [[cytoplasm]] and [[Cell nucleus|nucleus]] where plays an important role in the regulation of [[cell cycle]].<ref name="Steel_2012"/>


It has been demonstrated that two isoforms of IL-15 mRNA are generated by alternatively [[RNA splicing|splicing]] in mice. The isoform which had an alternative exon 5 containing another 3’ splicing site, exhibited a high [[Translation (biology)|translational]] efficiency, and the product lack [[hydrophobe|hydrophobic]] [[protein domain|domains]] in the [[signal peptide|signal sequence]] of the N-terminus. This suggests that the protein derived from this isoform is located intracellulary. The other isoform with normal exon 5, which is generated by integral splicing of the alternative exon 5, may be released extracellulary.<ref name="pmid10620614">{{cite journal |vauthors=Nishimura H, Yajima T, Naiki Y, Tsunobuchi H, Umemura M, Itano K, Matsuguchi T, Suzuki M, Ohashi PS, Yoshikai Y | title = Differential roles of interleukin 15 mRNA isoforms generated by alternative splicing in immune responses in vivo | journal = J. Exp. Med. | volume = 191 | issue = 1 | pages = 157–70 |date=January 2000 | pmid = 10620614 | pmc = 2195806 | doi = 10.1084/jem.191.1.157 }}</ref>


{{interleukins}}
Although IL-15 [[mRNA]] can be found in many [[cell (biology)|cell]]s and [[tissue (biology)|tissue]]s including [[mast cells]], [[cancer cells]] or [[fibroblasts]], this [[cytokine]] is produced as a mature protein mainly by [[dendritic cells]], [[monocytes]] and [[macrophages]]. This discrepancy between the wide appearance of IL-15 mRNA and limited production of protein might be explained by the presence of the twelve in humans and five in mice upstream initiating codons, which can repress [[Translation (biology)|translation]] of IL-15 mRNA. Translational inactive mRNA is stored within the cell and can be induced upon specific signal.<ref name="pmid21531164">{{cite journal |vauthors=Jakobisiak M, Golab J, Lasek W | title = Interleukin 15 as a promising candidate for tumor immunotherapy | journal = Cytokine Growth Factor Rev. | volume = 22 | issue = 2 | pages = 99–108 |date=April 2011 | pmid = 21531164 | doi = 10.1016/j.cytogfr.2011.04.001 }}</ref> Expression of IL-15 can be stimulated by cytokine such as [[GM-CSF]], [[MRNA|double-strand mRNA]], unmethylated CpG oligonucleotides, [[lipopolysaccharide]] (LPS) through [[Toll-like receptors]] (TLR), [[interferon gamma]] ([[IFN-γ]]) or after infection of monocytes [[herpes simplex virus|herpes virus]], ''[[Mycobacterium tuberculosis]]'' and ''[[Candida albicans]]'' (Figure 2).<ref name="pmid9574546">{{cite journal |vauthors=Bamford RN, DeFilippis AP, Azimi N, Kurys G, Waldmann TA | title = The 5' untranslated region, signal peptide, and the coding sequence of the carboxyl terminus of IL-15 participate in its multifaceted translational control | journal = J. Immunol. | volume = 160 | issue = 9 | pages = 4418–26 |date=May 1998 | pmid = 9574546 | doi = }}</ref> [[File:Doc2.1.jpg|thumb|'''Figure 2.'''  The originally identified isoform, with long signal peptide of 48 amino acids (IL-15 LSP) consisted of a 316 bp 5’-untraslated region (UTR), 486 bp coding sequence and on the C-terminus 400 bp 3’-UTR region. The other isoform (IL-15 SSP) has a short signal peptide of 21 amino acids encoded by exons 4A and 5.  Both isoforms shared 11 amino acids between signal sequences of the leader peptides.]]


[[pl:Interleukina 15]]
== Signaling ==
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[[File:Doc 6.jpg|thumb|'''Figure 3.'''  The main mechanism of IL-15 signaling is trans-presentation which is mediated by membrane-bound complex IL-15/IL-15Rα. Signaling pathway of IL-15 begins with biding to IL-15Rα receptor, with subsequent presentation to surrounding cells bearing IL-15Rβγc complex on their cell surface.]]
[[File:Doc 7.jpg|thumb|'''Figure 4.'''  IL-15 bind to IL-15Rα receptor alone with affinity (K<sub>a</sub> = 1.10<sup>11</sup>/M). It can also bind to IL-15Rβγc signaling complex with lower affinity (Ka = 1.10<sup>9</sup>/M).]]
[[File:Doc 8.jpg|thumb|'''Figure 5.'''  Signaling pathway of IL-15 begins with biding to IL-15Rα receptor, with subsequent presentation to surrounding cells bearing IL-15Rβγc complex on their cell surface. Upon binding IL-15β subunit activates Janus kinase 1 (Jak1) and γc subunit Janus kinase 3 (Jak3), which leads to phosphorylation and activation of signal transducer and activator of transcription 3 (STAT3) and STAT5. Due to sharing of receptor subunits between IL-2 and IL-15, both of these cytokines have similar downstream effects including the induction of B-cell lymphoma (Bcl-2), MAP (mitogen-activated protein kinase) kinase pathway and the phosphorylation of Lck (lymphocyte-activated protein tyrosine kinase) and Syk (spleen tyrosine kinase) kinases, which leads to cell proliferation and maturation.]]
[[File:Doc4.jpg|thumb|'''Figure 6.'''  The second mechanism pof IL-15 action is cis-presentation, when IL-15 is presented by IL-15Rα to 15Rβγc signaling complex on the same cell. This mechanism is mediated by the C-terminus flexibility which is mediated by 32 amino acids linker and/or 74 amino acids long PT region.]]
 
The prevailing mechanism of IL-15 action seems to be [[juxtacrine signaling]] or also determined as cell-to-cell contact. It also includes intracrine and reverse signaling. IL-15 was initially characterized as a soluble molecule. Later it was shown that IL-15 also exists as a membrane-bound form which represents the major form of IL-15 [[protein]]. In membrane-bound form it could be bound directly to [[cellular membrane]] or presented by [[IL-15 receptor|IL-15Rα receptor]].<ref name = "pmid21531164"/>
 
The main mechanism of IL-15 signaling is trans-presentation which is mediated by membrane-bound complex IL-15/IL-15Rα (Figure 3).<ref name="Olsen_2007">{{cite journal |vauthors=Olsen SK, Ota N, Kishishita S, Kukimoto-Niino M, Murayama K, Uchiyama H, Toyama M, Terada T, Shirouzu M, Kanagawa O, Yokoyama S | title = Crystal Structure of the interleukin-15.interleukin-15 receptor alpha complex: insights into trans and cis presentation | journal = J. Biol. Chem. | volume = 282 | issue = 51 | pages = 37191–204 |date=December 2007 | pmid = 17947230 | doi = 10.1074/jbc.M706150200 }}</ref> IL-15 bind to IL-15Rα receptor alone with [[Affinity (pharmacology)|affinity]] (K<sub>a</sub> = 1.10<sup>11</sup>/M). It can also bind to IL-15Rβγ<sub>c</sub> signaling complex with lower affinity (K<sub>a</sub> = 1.10<sup>9</sup>/M) (Figure 4).<ref name="pmid12401478"/>
 
Signaling pathway of IL-15 begins with binding to IL-15Rα receptor, with subsequent presentation to surrounding cells bearing IL-15Rβγc complex on their cell surface. Upon binding IL-15β subunit activates [[Janus kinase 1]] ([[Janus kinase 1|Jak1]]) and γc subunit [[Janus kinase 3]] ([[Janus kinase 3|Jak3]]), which leads to [[phosphorylation]] and activation of [[STAT3|signal transducer and activator of transcription 3]] ([[STAT3]]) and [[STAT5]].<ref>{{cite journal | vauthors = Okada S, Han S, Patel ES, Yang LJ, Chang LJ | title = STAT3 signaling contributes to the high effector activities of interleukin-15-derived dendritic cells | journal = Immunology and Cell Biology | volume = 93 | issue = 5 | pages = 461–71 | pmid = 25582338 | doi = 10.1038/icb.2014.103 | pmc=4450366 | year=2015}}</ref> Due to sharing of [[Receptor (immunology)|receptor]] subunits between [[Interleukin 2|IL-2]] and IL-15, both of these [[cytokine]]s have similar downstream effects including the induction of [[Bcl-2 family|B-cell lymphoma]] ([[Bcl-2 family|Bcl-2]]), [[MAP kinase|MAP]] ([[mitogen-activated protein kinase]]) kinase pathway and the phosphorylation of Lck (lymphocyte-activated protein tyrosine kinase) and Syk (spleen tyrosine kinase) kinases, which leads to cell proliferation and maturation (Figure 5).<ref name="pmid12401478"/><ref name="pmid15896666">{{cite journal |vauthors=Schluns KS, Stoklasek T, Lefrançois L | title = The roles of interleukin-15 receptor alpha: trans-presentation, receptor component, or both? | journal = Int. J. Biochem. Cell Biol. | volume = 37 | issue = 8 | pages = 1567–71 |date=August 2005 | pmid = 15896666 | doi = 10.1016/j.biocel.2005.02.017 }}</ref>
 
In [[mast cells]], the IL-15R [[signaling pathway]] has been found to include Jak2 and STAT5 instead Jak1/3 and STAT3/5. Phosphorylation STATs form transcription factors and activate transcription of appropriate genes. The β chain of IL-15R recruits and also activates protein tyrosine kinases of the Src family including Lck, Fyn and Lyn kinase. It also activates phosphatidylinositol 3-kinase (PI3K) and AKT signaling pathway and induce expression of transcription factors including c-Fos, c-Jun, c-Myc and NF-κB.<ref name="pmid21531164"/>
 
IL-15 is also able to bind to the 15Rβγc signaling complex with intermediate affinity without requirement for IL-15Rα receptor. Upon binding IL-15 to signaling complex,  kinases of the Src family including Lck and Fyn are activated, and subsequently activates PI3K and [[MAPK signaling pathway]].<ref name="pmid22064066">{{cite journal |vauthors=Perera PY, Lichy JH, Waldmann TA, Perera LP | title = The role of interleukin-15 in inflammation and immune responses to infection: implications for its therapeutic use | journal = Microbes Infect. | volume = 14 | issue = 3 | pages = 247–61 |date=March 2012 | pmid = 22064066 | doi = 10.1016/j.micinf.2011.10.006 | url = | pmc=3270128}}</ref> The second mechanism of IL-15 action is cis-presentation, when IL-15 is presented by IL-15Rα to 15Rβγc signaling complex on the same cell. This mechanism is mediated by the C-terminus flexibility which is mediated by 32 amino acids linker and/or 74 amino acids long PT region (Figure 6).<ref name="Olsen_2007"/>
 
== Function ==
 
IL-15 regulates the activation and proliferation of [[T cells|T]] and [[natural killer cell|natural killer]] (NK) cells. Survival signals that maintain memory T cells in the absence of antigen are provided by IL-15.  This cytokine is also implicated in NK cell development.  In rodent lymphocytes, IL-15 prevents [[apoptosis]] by inducing [[BCL2-like 1 (gene)|BCL2L1]]/BCL-x(L), an inhibitor of the apoptosis pathway.<ref name = "entrez">{{cite web | title = Entrez Gene: IL15 interleukin 15| url =https://www.ncbi.nlm.nih.gov/gene/3600}}</ref> In humans with [[coeliac disease|celiac disease]] IL-15 similarly suppresses apoptosis in T-lymphocytes by inducing [[Bcl-2]] and/or [[Bcl-xL]].<ref name="pmid20440074">{{cite journal |vauthors=Malamut G, El Machhour R, Montcuquet N, Martin-Lannerée S, Dusanter-Fourt I, Verkarre V, Mention JJ, Rahmi G, Kiyono H, Butz EA, Brousse N, Cellier C, Cerf-Bensussan N, Meresse B | title = IL-15 triggers an antiapoptotic pathway in human intraepithelial lymphocytes that is a potential new target in celiac disease–associated inflammation and lymphomagenesis | journal = J. Clin. Invest. | volume = 120 | issue = 6 | pages = 2131–43 |date=June 2010 | pmid = 20440074 | pmc = 2877946 | doi = 10.1172/JCI41344 }}</ref>
 
A [[erythropoietin|hematopoietin]] receptor, the [[IL-15 receptor]], that binds IL-15 propagates its function.  Some subunits of the IL-15 receptor are shared in common with the receptor for a structurally related cytokine called [[Interleukin 2]] (IL-2) allowing both cytokines to compete for and negatively regulate each other's activity.  [[CD8]]+ memory T cell number is controlled by a balance between IL-15 and IL-2.  When IL-15 binds its receptor, [[Janus kinase|JAK kinase]], [[STAT3]], [[STAT5]], and [[STAT6]] [[transcription factor]]s are activated to elicit downstream signaling events.
 
As a [[myokine]], IL-15 appears to play a significant role in the reduction of visceral (intra-abdominal or interstitial) fat.<ref>Pedersen, Bente Klarlund. "Muscles and their myokines." ''The Journal of Experimental Biology'' 214, 337-346. © 2011. Published by The Company of Biologists Ltd. {{DOI|10.1242/jeb.048074}}</ref>
 
== Disease ==
 
=== Epstein-Barr virus ===
 
In humans with history of acute [[infectious mononucleosis]] (the syndrome associated with primary [[Epstein-Barr virus]] infection), IL-15R expressing lymphocytes are not detected even 14 years after infection.<ref name="pmid16543467">{{cite journal |vauthors=Sauce D, Larsen M, Curnow SJ, Leese AM, Moss PA, Hislop AD, Salmon M, Rickinson AB | title = EBV-associated mononucleosis leads to long-term global deficit in T-cell responsiveness to IL-15 | journal = Blood | volume = 108 | issue = 1 | pages = 11–8 |date=July 2006 | pmid = 16543467 | doi = 10.1182/blood-2006-01-0144 }}</ref>
 
=== Celiac disease ===
 
There have been recent studies suggesting that suppression of IL-15 may be a potential treatment for [[celiac disease]] and even presents the possibility of preventing its development. In one study with mice blocking IL-15 with an antibody led to the reversal of autoimmune intestinal damage.<ref name="pmid21307853">{{cite journal |vauthors=DePaolo RW, Abadie V, Tang F, Fehlner-Peach H, Hall JA, Wang W, Marietta EV, Kasarda DD, Waldmann TA, Murray JA, Semrad C, Kupfer SS, Belkaid Y, Guandalini S, Jabri B | title = Co-adjuvant effects of retinoic acid and IL-15 induce inflammatory immunity to dietary antigens | journal = Nature | volume = 471 | issue = 7337 | pages = 220–4 |date=March 2011 | pmid = 21307853 | pmc = 3076739 | doi = 10.1038/nature09849 | laysummary = http://www.webmd.com/digestive-disorders/celiac-disease/news/20110208/new-treatment-for-celiac-disease | laysource = WebMD Health News }}</ref> In another study mice used were able to eat [[gluten]] without developing symptoms.<ref name="pmid19805228">{{cite journal |vauthors=Yokoyama S, Watanabe N, Sato N, Perera PY, Filkoski L, Tanaka T, Miyasaka M, Waldmann TA, Hiroi T, Perera LP | title = Antibody-mediated blockade of IL-15 reverses the autoimmune intestinal damage in transgenic mice that overexpress IL-15 in enterocytes | journal = Proc. Natl. Acad. Sci. U.S.A. | volume = 106 | issue = 37 | pages = 15849–54 |date=September 2009 | pmid = 19805228 | pmc = 2736142 | doi = 10.1073/pnas.0908834106 }}</ref>
 
=== Non-alcoholic fatty liver disease ===
A recent report indicated IL-15 promotes non-alcoholic fatty liver disease.<ref name="Cepero-Donates 2016">{{cite journal |vauthors= Cepero-Donates Y, Lacraz G, Ghobadi F, Rakotoarivelo V, Orkhis S, Mayhue M, Chen YG, Rola-Pleszczynski M, Menendez A, Ilangumaran S, Ramanathan S | title = Interleukin-15-mediated inflammation promotes non-alcoholic fatty liver disease | journal = Cytokine | volume = 82 | pages = 102–111 |date = Jun 2016 | pmid = 26868085 | doi = 10.1016/j.cyto.2016.01.020 }}</ref>
 
== Immunotherapy ==
 
=== Metastatic cancer ===
 
IL-15 has been shown to enhance the anti-tumor immunity of CD8+ T cells in pre-clinical models.<ref name="pmid14762166">{{cite journal |vauthors=Klebanoff CA, Finkelstein SE, Surman DR, Lichtman MK, Gattinoni L, Theoret MR, Grewal N, Spiess PJ, Antony PA, Palmer DC, Tagaya Y, Rosenberg SA, Waldmann TA, Restifo NP | title = IL-15 enhances the in vivo antitumor activity of tumor-reactive CD8+ T Cells | journal = Proc. Natl. Acad. Sci. U.S.A. | volume = 101 | issue = 7 | pages = 1969–74 |date=February 2004 | pmid = 14762166 | pmc = 357036 | doi = 10.1073/pnas.0307298101 }}</ref><ref name="pmid16474399">{{cite journal |vauthors=Teague RM, Sather BD, Sacks JA, Huang MZ, Dossett ML, Morimoto J, Tan X, Sutton SE, Cooke MP, Ohlén C, Greenberg PD | title = Interleukin-15 rescues tolerant CD8+ T cells for use in adoptive immunotherapy of established tumors | journal = Nat. Med. | volume = 12 | issue = 3 | pages = 335–41 |date=March 2006 | pmid = 16474399 | doi = 10.1038/nm1359  }}</ref> A [[phase I clinical trial]] to evaluate the safety, dosing, and anti-tumor [[efficacy]] of IL-15 in patients with [[Metastasis|metastatic]] [[melanoma]] and [[renal cell carcinoma]] (kidney cancer) has begun to [[wikt:enrollment|enroll]] patients at the [[National Institutes of Health]].<ref name="url_ClinicalTrials.gov">{{cite web | url = http://www.clinicaltrials.gov/ct2/show/NCT01021059 | title = A Phase I Study of Intravenous Recombinant Human IL-15 in Adults With Refractory Metastatic Malignant Melanoma and Metastatic Renal Cell Cancer | publisher = ClinicalTrials.gov }}</ref>
 
=== Vaccines Adjuvants===
 
Vector-based therapy – Nonlytic Newcastle Disease Virus (NDV) was engineered to express recombinant IL-15 protein to generate an NDV-modified tumor vaccine. Preclinical results of NDV-modified tumor vaccine showed promise by controlling melanoma tumor growth in mice.<ref name="Xu 2017">{{cite journal |vauthors=Xu X, Sun Q, Yu X, Zhao L | title = Rescue of nonlytic Newcastle Disease Virus (NVD) expressing IL-15 for cancer immunotherapy | journal = Virus Res | volume = 233 | pages = 35–41 | date = Apr 2017 | pmid = 28286036 | doi = 10.1016/j.virusres.2017.03.003 }}</ref> A recombinant vaccinia virus expressing influenza A proteins and IL-15 promoted cross protection by CD4+ T cells.<ref name="Valkenburg 2014">{{cite journal |vauthors=Valkenburg SA, Li OT, Mak PW, Mok CK, Nicholls JM, Guan Y, Waldmann TA, Peiris JS, Perera LP, Poon LL | title =IL-15-adjuvanted multivalent vaccinia-based universal influenza vaccine requires CD4+ T cells for heterosubtypic protection | journal = Proc. Natl. Acad. Sci. U.S.A. | volume = 111 | issue = 15 | pages = 5676–5681 |date = Apr 2014 | pmid = 24706798 | doi = 10.1073/pnas.1403684111 }}</ref> A Brucella DNA vacccine containing IL-15 gene enhanced the CD8+ T cell immune response in mice.<ref name="Hu 2010">{{cite journal |vauthors=Hu XD, Chen ST, Li JY, Yu DH, Yi-Zhang, Cai H | title = An IL-15 adjuvant enhances the efficacy of a combined DNA vaccine against Brucella by increasing the CD8+ cytotoxic T cell response | journal = Vaccine | volume = 28 | issue = 12 | pages = 2408–2415 |date = Mar 2010 | pmid = 20064480 | doi = 10.1016/j.vaccine.2009.12.076 }}</ref> IL-15 was needed for CD4+ T cell heterosubtypic protection while using a multivalent influenza vaccine using vaccinia-based vector.<ref name = "Valkenburg 2014"/> While influenza A virus expressing IL-15 stimulates both innate and adaptive immune cells to decrease tumor growth mice.<ref name = "Hock 2017">{{cite journal |vauthors=Hock K, Laengle J, Kuznetsova I, Egorov A, Hegedus B, Dome B, Wekerle T, Sachet M, Bergmann M | title = Oncolytic influenza A virus expressing interleukin-15 decreases tumor growth in vivo | journal = Surgery | volume = 161 | issue = 3 | pages = 735–746 |date= Mar 2017 | pmid = 27776794 | doi = 10.1016/j.surg.2016.08.045 }}</ref>
 
=== Transpresentation complexes ===
 
Currently there are two varieties of IL-15 superagonist available. One combines IL-15 and IL-15Rα-Fc (R&D Systems) ''in vitro'' to generate the complex. It is referred to as IL-15 SA. A second IL-15 superagonist complex called ALT-803 is offered by [[Altor BioScience]].
 
==== IL-15 SA ====
IL-15 SA is currently being evaluated for antiviral and anticancer activities, in addition to enhancing immunotherapy and vaccination.<ref name="Ahmad 2005">{{cite journal |vauthors=Ahmad A, Ahmad R, Iannello A, Toma E, Morisset R, Sindhu ST | title = IL-15 and HIV infection: lessons for immunotherapy and vaccination | journal = Curr HIV Res | volume = 3 | issue = 3 | pages = 261–270 |date = 2005 | pmid = 16022657 }}</ref><ref name="Suck 2011 ">{{cite journal |vauthors=Suck G, Oei VY, Linn YC, Ho SH, Chu S, Choong A, Niam M, Koh MB | title = Interleukin-15 supports generation of highly potent clinical-grade natural killer cells in long-term cultures for targeting hematological malignancies | journal = Exp Hematol | volume = 39 | issue = 9 | pages = 904–914 |date = Sep 2011 | pmid = 21703984 | doi = 10.1016/j.exphem.2011.06.003 }}</ref> One potential shortcoming of IL-15 SA was its enhancement of septic shock in mice.<ref name="Guo 2017">{{cite journal |vauthors=Guo Y, Luan L, Patil NK, Wang J, Bohannon JK, Rabacal W, Fensterheim BA, Hernandez A, Sherwood ER | title = IL-15 Enables Septic Shock by Maintaining NK Cell Integrity and Function | journal = J Immunol | volume = 198 | issue = 3 | pages = 1320–1333 |date = Feb 2017 | pmid = 28031340 | pmc = 5263185 | doi = 10.4049/jimmunol.1601486 }}</ref>
 
==== ALT-803 ====
ALT-803 is a fusion protein of IL-15 and a soluble [[T-cell receptor]] for [[TP53|p53 tumor-associated antigen]].<ref name=FierceProfile2009>{{cite news|last1=Carroll|first1=John|title=Emerging Drug Developer: Altor BioScience|url=http://www.fiercebiotech.com/special-report/emerging-drug-developer-altor-bioscience|work=FierceBiotech|date=May 4, 2009|language=en}}</ref><ref>{{cite web|title=ALT 803|url=http://adis.springer.com/drugs/800039285|publisher=AdisInsight|accessdate=30 June 2017|language=en}}</ref><ref>{{cite book|last1=Romano|first1=Emanuela|last2=Margolin|first2=Kim|editor1-last=Butterfield|editor1-first=Lisa H.|editor2-last=Kaufman|editor2-first=Howard L.|editor3-last=Marincola|editor3-first=Francesco M.|title=Cancer Immunotherapy Principles and Practice|date=2017|publisher=Springer Publishing Company|isbn=9781617052736|pages=277–278|url=https://books.google.com/books?id=tjwuDgAAQBAJ&pg=PA277|language=en|chapter=18. T Cell Modulatory Cytokines}}</ref>  ALT-803 was given [[Fast track (FDA)|fast track]] status by the FDA in 2017 and at that time, Phase III trials in bladder cancer were being prepared.<ref name=FierceRevolt2017>{{cite news|last1=Adams|first1=Ben|title=Altor shareholders revolt against Soon-Shiong buyout|url=http://www.fiercebiotech.com/biotech/soon-shiong-deal-for-altor-could-be-rocked-by-revolt|work=FierceBiotech|date=June 28, 2017|language=en}}</ref>
 
== References ==
{{Reflist|35em}}
 
== Further reading ==
{{refbegin|35em}}
*{{cite journal | author=Maślińska D |title=The cytokine network and interleukin-15 (IL-15) in brain development |journal=Folia Neuropathologica |volume=39 |issue=2 |pages=43–7 |year=2001 |pmid=11680634 }}
*{{cite journal |vauthors=Liew FY, McInnes IB |title=Role of interleukin 15 and interleukin 18 in inflammatory response |journal=Ann. Rheum. Dis. |volume=61 Suppl 2 |pages=ii100–2 |year=2002 |pmid=12379638 | pmc=1766710 | doi = 10.1136/ard.61.suppl_2.ii100 | issue=Suppl 2  }}
*{{cite journal  |vauthors=Lodolce JP, Burkett PR, Koka RM, etal |title=Regulation of lymphoid homeostasis by interleukin-15 |journal=Cytokine Growth Factor Rev. |volume=13 |issue=6 |pages=429–39 |year=2003 |pmid=12401478 |doi=10.1016/S1359-6101(02)00029-1 }}
*{{cite journal |author1=Mattei Fabrizio |author2=Schiavoni G. |author3=Belardelli F. |author4=Tough D.F. |title=IL-15 is expressed by dendritic cells in response to Type I IFN, Double-stranded RNA, or Lipopolysaccharide and promotes dendritic cell activation |journal=J. Immunol. |volume=167 |issue=3 |pages=1179–87 |year=2001 |pmid=11466332 |doi=10.4049/jimmunol.167.3.1179}}
{{refend}}
 
{{Interleukins}}
{{Interleukin receptor modulators}}
 
[[Category:Interleukins]]

Revision as of 11:46, 7 November 2017

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Interleukin-15 (IL-15) is a cytokine with structural similarity to Interleukin-2 (IL-2). Like IL-2, IL-15 binds to and signals through a complex composed of IL-2/IL-15 receptor beta chain (CD122) and the common gamma chain (gamma-C, CD132). IL-15 is secreted by mononuclear phagocytes (and some other cells) following infection by virus(es). This cytokine induces cell proliferation of natural killer cells; cells of the innate immune system whose principal role is to kill virally infected cells.

Expression

IL-15 was discovered in 1994 by two different laboratories, and characterized as T cell growth factor.[1] Together with Interleukin-2 (IL-2), Interleukin-4 (IL-4), Interleukin-7 (IL-7), Interleukin-9 (IL-9), granulocyte colony-stimulating factor (G-CSF), and granulocyte-macrophage colony-stimulating factor (GM-CSF), IL-15 belongs to the four α-helix bundle family of cytokine.[1][2]

IL-15 is constitutively expressed by a large number of cell types and tissues, including monocytes, macrophages, dendritic cells (DC), keratinocytes, fibroblasts and nerve cells.[3] As a pleiotropic cytokine, it plays an important role in innate and adaptive immunity.[4]

Gene

IL-15 is 14-15 kDa glycoprotein encoded by the 34 kb region of chromosome 4q31 in humans, and at the central region of chromosome 8 in mice.[5] The human IL-15 gene comprises nine exons (1 - 8 and 4A) and eight introns, four of which (exons 5 through 8) code for the mature protein (Figure 1).[1]

File:Gen IL-15.jpg
Figure 1. IL-15 is 14-15 kDa glycoprotein encoded by the 34 kb region on chromosome 4q31, and by central region of chromosome 8 in mice. The human IL-15 gene comprises nine exons (1 - 8 and 4A) and eight introns, four of which (exons 5 through 8) code for the mature protein.

Two alternatively spliced transcript variants of this gene encoding the same protein have been reported.[6] The originally identified isoform, with long signal peptide of 48 amino acids (IL-15 LSP) consisted of a 316 bp 5’-untranslated region (UTR), 486 bp coding sequence and the C-terminus 400 bp 3’-UTR region. The other isoform (IL-15 SSP) has a short signal peptide of 21 amino acids encoded by exons 4A and 5.[1] Both isoforms shared 11 amino acids between signal sequences of the N-terminus.[7] Although both isoforms produce the same mature protein, they differ in their cellular trafficking.[1] IL-15 LSP isoform was identified in Golgi apparatus [GC], early endosomes and in the endoplasmic reticulum (ER). It exists in two forms, secreted and membrane-bound particularly on dendritic cells. On the other hand, IL-15 SSP isoform is not secreted and it appears to be restricted to the cytoplasm and nucleus where plays an important role in the regulation of cell cycle.[1]

It has been demonstrated that two isoforms of IL-15 mRNA are generated by alternatively splicing in mice. The isoform which had an alternative exon 5 containing another 3’ splicing site, exhibited a high translational efficiency, and the product lack hydrophobic domains in the signal sequence of the N-terminus. This suggests that the protein derived from this isoform is located intracellulary. The other isoform with normal exon 5, which is generated by integral splicing of the alternative exon 5, may be released extracellulary.[8]

Although IL-15 mRNA can be found in many cells and tissues including mast cells, cancer cells or fibroblasts, this cytokine is produced as a mature protein mainly by dendritic cells, monocytes and macrophages. This discrepancy between the wide appearance of IL-15 mRNA and limited production of protein might be explained by the presence of the twelve in humans and five in mice upstream initiating codons, which can repress translation of IL-15 mRNA. Translational inactive mRNA is stored within the cell and can be induced upon specific signal.[9] Expression of IL-15 can be stimulated by cytokine such as GM-CSF, double-strand mRNA, unmethylated CpG oligonucleotides, lipopolysaccharide (LPS) through Toll-like receptors (TLR), interferon gamma (IFN-γ) or after infection of monocytes herpes virus, Mycobacterium tuberculosis and Candida albicans (Figure 2).[10]

File:Doc2.1.jpg
Figure 2. The originally identified isoform, with long signal peptide of 48 amino acids (IL-15 LSP) consisted of a 316 bp 5’-untraslated region (UTR), 486 bp coding sequence and on the C-terminus 400 bp 3’-UTR region. The other isoform (IL-15 SSP) has a short signal peptide of 21 amino acids encoded by exons 4A and 5. Both isoforms shared 11 amino acids between signal sequences of the leader peptides.

Signaling

File:Doc 6.jpg
Figure 3. The main mechanism of IL-15 signaling is trans-presentation which is mediated by membrane-bound complex IL-15/IL-15Rα. Signaling pathway of IL-15 begins with biding to IL-15Rα receptor, with subsequent presentation to surrounding cells bearing IL-15Rβγc complex on their cell surface.
File:Doc 7.jpg
Figure 4. IL-15 bind to IL-15Rα receptor alone with affinity (Ka = 1.1011/M). It can also bind to IL-15Rβγc signaling complex with lower affinity (Ka = 1.109/M).
File:Doc 8.jpg
Figure 5. Signaling pathway of IL-15 begins with biding to IL-15Rα receptor, with subsequent presentation to surrounding cells bearing IL-15Rβγc complex on their cell surface. Upon binding IL-15β subunit activates Janus kinase 1 (Jak1) and γc subunit Janus kinase 3 (Jak3), which leads to phosphorylation and activation of signal transducer and activator of transcription 3 (STAT3) and STAT5. Due to sharing of receptor subunits between IL-2 and IL-15, both of these cytokines have similar downstream effects including the induction of B-cell lymphoma (Bcl-2), MAP (mitogen-activated protein kinase) kinase pathway and the phosphorylation of Lck (lymphocyte-activated protein tyrosine kinase) and Syk (spleen tyrosine kinase) kinases, which leads to cell proliferation and maturation.
File:Doc4.jpg
Figure 6. The second mechanism pof IL-15 action is cis-presentation, when IL-15 is presented by IL-15Rα to 15Rβγc signaling complex on the same cell. This mechanism is mediated by the C-terminus flexibility which is mediated by 32 amino acids linker and/or 74 amino acids long PT region.

The prevailing mechanism of IL-15 action seems to be juxtacrine signaling or also determined as cell-to-cell contact. It also includes intracrine and reverse signaling. IL-15 was initially characterized as a soluble molecule. Later it was shown that IL-15 also exists as a membrane-bound form which represents the major form of IL-15 protein. In membrane-bound form it could be bound directly to cellular membrane or presented by IL-15Rα receptor.[9]

The main mechanism of IL-15 signaling is trans-presentation which is mediated by membrane-bound complex IL-15/IL-15Rα (Figure 3).[11] IL-15 bind to IL-15Rα receptor alone with affinity (Ka = 1.1011/M). It can also bind to IL-15Rβγc signaling complex with lower affinity (Ka = 1.109/M) (Figure 4).[4]

Signaling pathway of IL-15 begins with binding to IL-15Rα receptor, with subsequent presentation to surrounding cells bearing IL-15Rβγc complex on their cell surface. Upon binding IL-15β subunit activates Janus kinase 1 (Jak1) and γc subunit Janus kinase 3 (Jak3), which leads to phosphorylation and activation of signal transducer and activator of transcription 3 (STAT3) and STAT5.[12] Due to sharing of receptor subunits between IL-2 and IL-15, both of these cytokines have similar downstream effects including the induction of B-cell lymphoma (Bcl-2), MAP (mitogen-activated protein kinase) kinase pathway and the phosphorylation of Lck (lymphocyte-activated protein tyrosine kinase) and Syk (spleen tyrosine kinase) kinases, which leads to cell proliferation and maturation (Figure 5).[4][13]

In mast cells, the IL-15R signaling pathway has been found to include Jak2 and STAT5 instead Jak1/3 and STAT3/5. Phosphorylation STATs form transcription factors and activate transcription of appropriate genes. The β chain of IL-15R recruits and also activates protein tyrosine kinases of the Src family including Lck, Fyn and Lyn kinase. It also activates phosphatidylinositol 3-kinase (PI3K) and AKT signaling pathway and induce expression of transcription factors including c-Fos, c-Jun, c-Myc and NF-κB.[9]

IL-15 is also able to bind to the 15Rβγc signaling complex with intermediate affinity without requirement for IL-15Rα receptor. Upon binding IL-15 to signaling complex, kinases of the Src family including Lck and Fyn are activated, and subsequently activates PI3K and MAPK signaling pathway.[14] The second mechanism of IL-15 action is cis-presentation, when IL-15 is presented by IL-15Rα to 15Rβγc signaling complex on the same cell. This mechanism is mediated by the C-terminus flexibility which is mediated by 32 amino acids linker and/or 74 amino acids long PT region (Figure 6).[11]

Function

IL-15 regulates the activation and proliferation of T and natural killer (NK) cells. Survival signals that maintain memory T cells in the absence of antigen are provided by IL-15. This cytokine is also implicated in NK cell development. In rodent lymphocytes, IL-15 prevents apoptosis by inducing BCL2L1/BCL-x(L), an inhibitor of the apoptosis pathway.[6] In humans with celiac disease IL-15 similarly suppresses apoptosis in T-lymphocytes by inducing Bcl-2 and/or Bcl-xL.[15]

A hematopoietin receptor, the IL-15 receptor, that binds IL-15 propagates its function. Some subunits of the IL-15 receptor are shared in common with the receptor for a structurally related cytokine called Interleukin 2 (IL-2) allowing both cytokines to compete for and negatively regulate each other's activity. CD8+ memory T cell number is controlled by a balance between IL-15 and IL-2. When IL-15 binds its receptor, JAK kinase, STAT3, STAT5, and STAT6 transcription factors are activated to elicit downstream signaling events.

As a myokine, IL-15 appears to play a significant role in the reduction of visceral (intra-abdominal or interstitial) fat.[16]

Disease

Epstein-Barr virus

In humans with history of acute infectious mononucleosis (the syndrome associated with primary Epstein-Barr virus infection), IL-15R expressing lymphocytes are not detected even 14 years after infection.[17]

Celiac disease

There have been recent studies suggesting that suppression of IL-15 may be a potential treatment for celiac disease and even presents the possibility of preventing its development. In one study with mice blocking IL-15 with an antibody led to the reversal of autoimmune intestinal damage.[18] In another study mice used were able to eat gluten without developing symptoms.[19]

Non-alcoholic fatty liver disease

A recent report indicated IL-15 promotes non-alcoholic fatty liver disease.[20]

Immunotherapy

Metastatic cancer

IL-15 has been shown to enhance the anti-tumor immunity of CD8+ T cells in pre-clinical models.[21][22] A phase I clinical trial to evaluate the safety, dosing, and anti-tumor efficacy of IL-15 in patients with metastatic melanoma and renal cell carcinoma (kidney cancer) has begun to enroll patients at the National Institutes of Health.[23]

Vaccines Adjuvants

Vector-based therapy – Nonlytic Newcastle Disease Virus (NDV) was engineered to express recombinant IL-15 protein to generate an NDV-modified tumor vaccine. Preclinical results of NDV-modified tumor vaccine showed promise by controlling melanoma tumor growth in mice.[24] A recombinant vaccinia virus expressing influenza A proteins and IL-15 promoted cross protection by CD4+ T cells.[25] A Brucella DNA vacccine containing IL-15 gene enhanced the CD8+ T cell immune response in mice.[26] IL-15 was needed for CD4+ T cell heterosubtypic protection while using a multivalent influenza vaccine using vaccinia-based vector.[25] While influenza A virus expressing IL-15 stimulates both innate and adaptive immune cells to decrease tumor growth mice.[27]

Transpresentation complexes

Currently there are two varieties of IL-15 superagonist available. One combines IL-15 and IL-15Rα-Fc (R&D Systems) in vitro to generate the complex. It is referred to as IL-15 SA. A second IL-15 superagonist complex called ALT-803 is offered by Altor BioScience.

IL-15 SA

IL-15 SA is currently being evaluated for antiviral and anticancer activities, in addition to enhancing immunotherapy and vaccination.[28][29] One potential shortcoming of IL-15 SA was its enhancement of septic shock in mice.[30]

ALT-803

ALT-803 is a fusion protein of IL-15 and a soluble T-cell receptor for p53 tumor-associated antigen.[31][32][33] ALT-803 was given fast track status by the FDA in 2017 and at that time, Phase III trials in bladder cancer were being prepared.[34]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Steel JC, Waldmann TA, Morris JC (January 2012). "Interleukin-15 biology and its therapeutic implications in cancer". Trends Pharmacol. Sci. 33 (1): 35–41. doi:10.1016/j.tips.2011.09.004. PMC 3327885. PMID 22032984.
  2. ↑ Di Sabatino A, Calarota SA, Vidali F, Macdonald TT, Corazza GR (February 2011). "Role of IL-15 in immune-mediated and infectious diseases". Cytokine Growth Factor Rev. 22 (1): 19–33. doi:10.1016/j.cytogfr.2010.09.003. PMID 21074481.
  3. ↑ Grabstein KH, Eisenman J, Shanebeck K, Rauch C, Srinivasan S, Fung V, Beers C, Richardson J, Schoenborn MA, Ahdieh M (May 1994). "Cloning of a T cell growth factor that interacts with the beta chain of the interleukin-2 receptor". Science. 264 (5161): 965–8. doi:10.1126/science.8178155. PMID 8178155.
  4. ↑ 4.0 4.1 4.2 Lodolce JP, Burkett PR, Koka RM, Boone DL, Ma A (December 2002). "Regulation of lymphoid homeostasis by interleukin-15". Cytokine Growth Factor Rev. 13 (6): 429–39. doi:10.1016/S1359-6101(02)00029-1. PMID 12401478.
  5. ↑ Waldmann TA, Tagaya Y (1999). "The multifaceted regulation of interleukin-15 expression and the role of this cytokine in NK cell differentiation and host response to intracellular pathogens". Annu. Rev. Immunol. 17: 19–49. doi:10.1146/annurev.immunol.17.1.19. PMID 10358752.
  6. ↑ 6.0 6.1 "Entrez Gene: IL15 interleukin 15".
  7. ↑ Tagaya Y, Kurys G, Thies TA, Losi JM, Azimi N, Hanover JA, Bamford RN, Waldmann TA (December 1997). "Generation of secretable and nonsecretable interleukin 15 isoforms through alternate usage of signal peptides". Proc. Natl. Acad. Sci. U.S.A. 94 (26): 14444–9. doi:10.1073/pnas.94.26.14444. PMC 25016. PMID 9405632.
  8. ↑ Nishimura H, Yajima T, Naiki Y, Tsunobuchi H, Umemura M, Itano K, Matsuguchi T, Suzuki M, Ohashi PS, Yoshikai Y (January 2000). "Differential roles of interleukin 15 mRNA isoforms generated by alternative splicing in immune responses in vivo". J. Exp. Med. 191 (1): 157–70. doi:10.1084/jem.191.1.157. PMC 2195806. PMID 10620614.
  9. ↑ 9.0 9.1 9.2 Jakobisiak M, Golab J, Lasek W (April 2011). "Interleukin 15 as a promising candidate for tumor immunotherapy". Cytokine Growth Factor Rev. 22 (2): 99–108. doi:10.1016/j.cytogfr.2011.04.001. PMID 21531164.
  10. ↑ Bamford RN, DeFilippis AP, Azimi N, Kurys G, Waldmann TA (May 1998). "The 5' untranslated region, signal peptide, and the coding sequence of the carboxyl terminus of IL-15 participate in its multifaceted translational control". J. Immunol. 160 (9): 4418–26. PMID 9574546.
  11. ↑ 11.0 11.1 Olsen SK, Ota N, Kishishita S, Kukimoto-Niino M, Murayama K, Uchiyama H, Toyama M, Terada T, Shirouzu M, Kanagawa O, Yokoyama S (December 2007). "Crystal Structure of the interleukin-15.interleukin-15 receptor alpha complex: insights into trans and cis presentation". J. Biol. Chem. 282 (51): 37191–204. doi:10.1074/jbc.M706150200. PMID 17947230.
  12. ↑ Okada S, Han S, Patel ES, Yang LJ, Chang LJ (2015). "STAT3 signaling contributes to the high effector activities of interleukin-15-derived dendritic cells". Immunology and Cell Biology. 93 (5): 461–71. doi:10.1038/icb.2014.103. PMC 4450366. PMID 25582338.
  13. ↑ Schluns KS, Stoklasek T, Lefrançois L (August 2005). "The roles of interleukin-15 receptor alpha: trans-presentation, receptor component, or both?". Int. J. Biochem. Cell Biol. 37 (8): 1567–71. doi:10.1016/j.biocel.2005.02.017. PMID 15896666.
  14. ↑ Perera PY, Lichy JH, Waldmann TA, Perera LP (March 2012). "The role of interleukin-15 in inflammation and immune responses to infection: implications for its therapeutic use". Microbes Infect. 14 (3): 247–61. doi:10.1016/j.micinf.2011.10.006. PMC 3270128. PMID 22064066.
  15. ↑ Malamut G, El Machhour R, Montcuquet N, Martin-Lannerée S, Dusanter-Fourt I, Verkarre V, Mention JJ, Rahmi G, Kiyono H, Butz EA, Brousse N, Cellier C, Cerf-Bensussan N, Meresse B (June 2010). "IL-15 triggers an antiapoptotic pathway in human intraepithelial lymphocytes that is a potential new target in celiac disease–associated inflammation and lymphomagenesis". J. Clin. Invest. 120 (6): 2131–43. doi:10.1172/JCI41344. PMC 2877946. PMID 20440074.
  16. ↑ Pedersen, Bente Klarlund. "Muscles and their myokines." The Journal of Experimental Biology 214, 337-346. © 2011. Published by The Company of Biologists Ltd. doi:10.1242/jeb.048074
  17. ↑ Sauce D, Larsen M, Curnow SJ, Leese AM, Moss PA, Hislop AD, Salmon M, Rickinson AB (July 2006). "EBV-associated mononucleosis leads to long-term global deficit in T-cell responsiveness to IL-15". Blood. 108 (1): 11–8. doi:10.1182/blood-2006-01-0144. PMID 16543467.
  18. ↑ DePaolo RW, Abadie V, Tang F, Fehlner-Peach H, Hall JA, Wang W, Marietta EV, Kasarda DD, Waldmann TA, Murray JA, Semrad C, Kupfer SS, Belkaid Y, Guandalini S, Jabri B (March 2011). "Co-adjuvant effects of retinoic acid and IL-15 induce inflammatory immunity to dietary antigens". Nature. 471 (7337): 220–4. doi:10.1038/nature09849. PMC 3076739. PMID 21307853. Lay summary – WebMD Health News.
  19. ↑ Yokoyama S, Watanabe N, Sato N, Perera PY, Filkoski L, Tanaka T, Miyasaka M, Waldmann TA, Hiroi T, Perera LP (September 2009). "Antibody-mediated blockade of IL-15 reverses the autoimmune intestinal damage in transgenic mice that overexpress IL-15 in enterocytes". Proc. Natl. Acad. Sci. U.S.A. 106 (37): 15849–54. doi:10.1073/pnas.0908834106. PMC 2736142. PMID 19805228.
  20. ↑ Cepero-Donates Y, Lacraz G, Ghobadi F, Rakotoarivelo V, Orkhis S, Mayhue M, Chen YG, Rola-Pleszczynski M, Menendez A, Ilangumaran S, Ramanathan S (Jun 2016). "Interleukin-15-mediated inflammation promotes non-alcoholic fatty liver disease". Cytokine. 82: 102–111. doi:10.1016/j.cyto.2016.01.020. PMID 26868085.
  21. ↑ Klebanoff CA, Finkelstein SE, Surman DR, Lichtman MK, Gattinoni L, Theoret MR, Grewal N, Spiess PJ, Antony PA, Palmer DC, Tagaya Y, Rosenberg SA, Waldmann TA, Restifo NP (February 2004). "IL-15 enhances the in vivo antitumor activity of tumor-reactive CD8+ T Cells". Proc. Natl. Acad. Sci. U.S.A. 101 (7): 1969–74. doi:10.1073/pnas.0307298101. PMC 357036. PMID 14762166.
  22. ↑ Teague RM, Sather BD, Sacks JA, Huang MZ, Dossett ML, Morimoto J, Tan X, Sutton SE, Cooke MP, Ohlén C, Greenberg PD (March 2006). "Interleukin-15 rescues tolerant CD8+ T cells for use in adoptive immunotherapy of established tumors". Nat. Med. 12 (3): 335–41. doi:10.1038/nm1359. PMID 16474399.
  23. ↑ "A Phase I Study of Intravenous Recombinant Human IL-15 in Adults With Refractory Metastatic Malignant Melanoma and Metastatic Renal Cell Cancer". ClinicalTrials.gov.
  24. ↑ Xu X, Sun Q, Yu X, Zhao L (Apr 2017). "Rescue of nonlytic Newcastle Disease Virus (NVD) expressing IL-15 for cancer immunotherapy". Virus Res. 233: 35–41. doi:10.1016/j.virusres.2017.03.003. PMID 28286036.
  25. ↑ 25.0 25.1 Valkenburg SA, Li OT, Mak PW, Mok CK, Nicholls JM, Guan Y, Waldmann TA, Peiris JS, Perera LP, Poon LL (Apr 2014). "IL-15-adjuvanted multivalent vaccinia-based universal influenza vaccine requires CD4+ T cells for heterosubtypic protection". Proc. Natl. Acad. Sci. U.S.A. 111 (15): 5676–5681. doi:10.1073/pnas.1403684111. PMID 24706798.
  26. ↑ Hu XD, Chen ST, Li JY, Yu DH, Yi-Zhang, Cai H (Mar 2010). "An IL-15 adjuvant enhances the efficacy of a combined DNA vaccine against Brucella by increasing the CD8+ cytotoxic T cell response". Vaccine. 28 (12): 2408–2415. doi:10.1016/j.vaccine.2009.12.076. PMID 20064480.
  27. ↑ Hock K, Laengle J, Kuznetsova I, Egorov A, Hegedus B, Dome B, Wekerle T, Sachet M, Bergmann M (Mar 2017). "Oncolytic influenza A virus expressing interleukin-15 decreases tumor growth in vivo". Surgery. 161 (3): 735–746. doi:10.1016/j.surg.2016.08.045. PMID 27776794.
  28. ↑ Ahmad A, Ahmad R, Iannello A, Toma E, Morisset R, Sindhu ST (2005). "IL-15 and HIV infection: lessons for immunotherapy and vaccination". Curr HIV Res. 3 (3): 261–270. PMID 16022657.
  29. ↑ Suck G, Oei VY, Linn YC, Ho SH, Chu S, Choong A, Niam M, Koh MB (Sep 2011). "Interleukin-15 supports generation of highly potent clinical-grade natural killer cells in long-term cultures for targeting hematological malignancies". Exp Hematol. 39 (9): 904–914. doi:10.1016/j.exphem.2011.06.003. PMID 21703984.
  30. ↑ Guo Y, Luan L, Patil NK, Wang J, Bohannon JK, Rabacal W, Fensterheim BA, Hernandez A, Sherwood ER (Feb 2017). "IL-15 Enables Septic Shock by Maintaining NK Cell Integrity and Function". J Immunol. 198 (3): 1320–1333. doi:10.4049/jimmunol.1601486. PMC 5263185. PMID 28031340.
  31. ↑ Carroll, John (May 4, 2009). "Emerging Drug Developer: Altor BioScience". FierceBiotech.
  32. ↑ "ALT 803". AdisInsight. Retrieved 30 June 2017.
  33. ↑ Romano, Emanuela; Margolin, Kim (2017). "18. T Cell Modulatory Cytokines". In Butterfield, Lisa H.; Kaufman, Howard L.; Marincola, Francesco M. Cancer Immunotherapy Principles and Practice. Springer Publishing Company. pp. 277–278. ISBN 9781617052736.
  34. ↑ Adams, Ben (June 28, 2017). "Altor shareholders revolt against Soon-Shiong buyout". FierceBiotech.

Further reading

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