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<!-- The GNF_Protein_box is automatically maintained by Protein Box Bot.  See Template:PBB_Controls to Stop updates. -->
'''L-selectin''', also known as '''CD62L''', is a [[cell adhesion molecule]] found on [[lymphocytes]] and the preimplantation embryo. It belongs to the [[selectin]] family of proteins, which recognize sialylated carbohydrate groups. It is cleaved by [[ADAM17]].
{{GNF_Protein_box
| image = 
| image_source = 
| PDB =
| Name = Selectin L (lymphocyte adhesion molecule 1)
| HGNCid = 10720
| Symbol = SELL
| AltSymbols =; CD62L; LAM-1; LAM1; LECAM1; LNHR; LSEL; LYAM1; Leu-8; Lyam-1; PLNHR; TQ1; hLHRc
| OMIM = 153240
| ECnumber = 
| Homologene = 539
| MGIid = 98279
| GeneAtlas_image1 = PBB_GE_SELL_204563_at_tn.png
| Function = {{GNF_GO|id=GO:0005515 |text = protein binding}} {{GNF_GO|id=GO:0005529 |text = sugar binding}}
| Component = {{GNF_GO|id=GO:0005886 |text = plasma membrane}} {{GNF_GO|id=GO:0005887 |text = integral to plasma membrane}} {{GNF_GO|id=GO:0009897 |text = external side of plasma membrane}}
| Process = {{GNF_GO|id=GO:0006928 |text = cell motility}} {{GNF_GO|id=GO:0007155 |text = cell adhesion}}
| Orthologs = {{GNF_Ortholog_box
    | Hs_EntrezGene = 6402
    | Hs_Ensembl = ENSG00000188404
    | Hs_RefseqProtein = NP_000646
    | Hs_RefseqmRNA = NM_000655
    | Hs_GenLoc_db = 
    | Hs_GenLoc_chr = 1
    | Hs_GenLoc_start = 167926432
    | Hs_GenLoc_end = 167947463
    | Hs_Uniprot = P14151
    | Mm_EntrezGene = 20343
    | Mm_Ensembl = ENSMUSG00000026581
    | Mm_RefseqmRNA = NM_011346
    | Mm_RefseqProtein = NP_035476
    | Mm_GenLoc_db = 
    | Mm_GenLoc_chr = 1
    | Mm_GenLoc_start = 165899728
    | Mm_GenLoc_end = 165909011
    | Mm_Uniprot = Q3TA36
  }}
}}


'''L-selectin''', also known as '''CD62L''', is a [[cell adhesion molecule]] found on [[leukocytes]]. It belongs to the [[selectin]] family of proteins, which recognise sialylated carbohydrate groups. It is cleaved by [[ADAM17]].
SELL is a cell surface component that is a member of a family of adhesion/homing receptors that play important roles in lymphocyte-endothelial cell interactions. The molecule is composed of multiple domains: one homologous to lectins, one to epidermal growth factor, and two to the consensus repeat units found in C3/C4-binding proteins.<ref>{{cite web | title = Entrez Gene: SELL selectin L (lymphocyte adhesion molecule 1)| url = https://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=6402| accessdate = }}</ref>
 
<!-- The PBB_Summary template is automatically maintained by Protein Box Bot.  See Template:PBB_Controls to Stop updates. -->
{{PBB_Summary
| section_title =
| summary_text = SELL is a cell surface component that is a member of a family of adhesion/homing receptors which play important roles in leukocyte-endothelial cell interactions. The molecule is composed of multiple domains: one homologous to lectins, one to epidermal growth factor, and two to the consensus repeat units found in C3/C4 binding proteins.<ref>{{cite web | title = Entrez Gene: SELL selectin L (lymphocyte adhesion molecule 1)| url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=6402| accessdate = }}</ref>
}}


== Ligands ==
== Ligands ==
*[[GlyCAM-1]], found in the [[high endothelial venule]]s of the [[lymph node]]s.
*[[GlyCAM-1]], found in the [[high endothelial venule]]s of the [[lymph node]]s.
*[[CD34]], found on endothelial cells.
*[[CD34]], found on endothelial cells.
*[[MadCAM-1]], found on endothelial cells of [[gut associated lymphoid tissue]].
*[[MadCAM-1]], found on endothelial cells of [[gut-associated lymphoid tissue]].
*[[PSGL-1]], binds with low affinity.
*[[PSGL-1]], binds with low affinity.


== Function ==
== Function ==
L-selectin acts as a "homing receptor" for leukocytes to enter secondary lymphoid tissues via the high endothelial venules. [[Ligand]]s present on [[endothelial]] cells will bind to leukocytes expressing L-selectin, which causes the leukocytes to become localised at that point<ref name="robspath">{{cite book | title=Robbins Pathologic Basis of Disease| last=Cotran| coauthors=Kumar, Collins| publisher=W.B Saunders Company| location=Philadelphia| id=0-7216-7335-X}}</ref>. The receptor is also found on the cell surfaces of "naive" [[T-lymphocytes|T cells]], which have not yet encountered their specific antigen. This surface expression is lost after the cells are activated.
L-selectin acts as a "homing receptor" for lymphocytes to enter secondary lymphoid tissues via high endothelial venules. [[Ligand]]s present on [[endothelial]] cells will bind to lymphocytes expressing L-selectin, slowing lymphocyte trafficking through the blood, and facilitating entry into a secondary lymphoid organ at that point.<ref name="robspath">{{cite book | title=Robbins Pathologic Basis of Disease|vauthors=Robbins SL, Cotran RS, Kumar V, Collins T | publisher = W.B Saunders Company | location = Philadelphia | isbn = 0-7216-7335-X | year = 1998 }}</ref> The receptor is commonly found on the cell surfaces of [[T-lymphocytes|T cells]].  Naive T-lymphocytes, which have not yet encountered their specific antigen, need to enter secondary lymph nodes to encounter their antigen.  Central memory T-lymphocytes, which have encountered antigen, express L-selectin to localize in secondary lymphoid organs.  Here they reside ready to proliferate upon re-encountering antigen.  Effector memory T-lymphocytes do not express L-selectin, as they circulate in the periphery and have immediate effector functions upon encountering antigen.
 
High expression of L-selectin on human bone marrow progenitor cells is an early sign of cells becoming committed to lymphoid differentiation.<ref name="pmid22941246">{{cite journal |vauthors=Kohn LA, Hao QL, Sasidharan R, Parekh C, Ge S, Zhu Y, Mikkola HK, Crooks GM | title = Lymphoid priming in human bone marrow begins before expression of CD10 with upregulation of L-selectin | journal = Nat. Immunol. | volume = 13 | issue = 10 | pages = 963–71 |date=October 2012 | pmid = 22941246 | doi = 10.1038/ni.2405 }}</ref>
 
L-selectin is also present on the surface of human embryo trophoblasts prior to implantation into the uterus.  Similar to its function in lymphocytes, L-selectin acts as a receptor to facilitate adhesion of the embryo to the site of invasion on the surface epithelium of the uterine endometrium.  The embryo secretes human chorionic gonadotropin (hCG), which downregulates anti-adhesion factor, [[MUC-1]], located on the uterine epithelium at the site of invasion.  Removal of MUC-1 exposes the oligosaccharide ligands of the uterine epithelium, thus allowing binding by the L-selectin receptor of the trophopblast cell, followed by embryo adhesion and invasion.<ref name="pmid22374510">{{cite journal |vauthors=James JL, Carter AM, Chamley LW | title = Human placentation from nidation to 5 weeks of gestation. Part I: What do we know about formative placental development following implantation? | journal = Placenta | volume = 33 | issue = 5 | pages = 327–34 |date=May 2012 | pmid = 22374510 | doi = 10.1016/j.placenta.2012.01.020 }}</ref>
 
== References ==
{{reflist}}


==External links==
==External links==
* {{MeshName|L-Selectin}}
* {{MeshName|L-Selectin}}
* {{GeorgiaImmunology|1/physresp}}
* {{GeorgiaImmunology|1/physresp}}
== References ==
{{reflist|2}}


==Further reading==
==Further reading==
{{refbegin | 2}}
{{refbegin | 2}}
{{PBB_Further_reading
*{{cite journal  |vauthors=Ryan US, Worthington RE |title=Cell-cell contact mechanisms |journal=Curr. Opin. Immunol. |volume=4 |issue= 1 |pages= 33–7 |year= 1992 |pmid= 1375831 |doi=10.1016/0952-7915(92)90120-4 }}
| citations =
*{{cite journal  | author=Nicholson IC |title=CD62L (L-selectin) |journal=J. Biol. Regul. Homeost. Agents |volume=16 |issue= 2 |pages= 144–6 |year= 2003 |pmid= 12144128 |doi=  }}
*{{cite journal  | author=Ryan US, Worthington RE |title=Cell-cell contact mechanisms. |journal=Curr. Opin. Immunol. |volume=4 |issue= 1 |pages= 33-7 |year= 1992 |pmid= 1375831 |doi=  }}
*{{cite journal  |vauthors=Ivetic A, Ridley AJ |title=The telling tail of L-selectin |journal=Biochem. Soc. Trans. |volume=32 |issue= Pt 6 |pages= 1118–21 |year= 2005 |pmid= 15506984 |doi= 10.1042/BST0321118 }}
*{{cite journal  | author=Nicholson IC |title=CD62L (L-selectin). |journal=J. Biol. Regul. Homeost. Agents |volume=16 |issue= 2 |pages= 144-6 |year= 2003 |pmid= 12144128 |doi=  }}
*{{cite journal  | author=Lasky LA |title=An endothelial ligand for L-selectin is a novel mucin-like molecule |journal=Cell |volume=69 |issue= 6 |pages= 927–38 |year= 1992 |pmid= 1376638 |doi=10.1016/0092-8674(92)90612-G |name-list-format=vanc| author2=Singer MS  | author3=Dowbenko D  | display-authors=| last4=Imai  | first4=Yasuyuki  | last5=Henzel  | first5=William J.  | last6=Grimley  | first6=Chris  | last7=Fennie  | first7=Christopher  | last8=Gillett  | first8=Nancy  | last9=Watson  | first9=Susan R. }}
*{{cite journal  | author=Ivetic A, Ridley AJ |title=The telling tail of L-selectin. |journal=Biochem. Soc. Trans. |volume=32 |issue= Pt 6 |pages= 1118-21 |year= 2005 |pmid= 15506984 |doi= 10.1042/BST0321118 }}
*{{cite journal  | author=Ord DC |title=Structure of the gene encoding the human leukocyte adhesion molecule-1 (TQ1, Leu-8) of lymphocytes and neutrophils |journal=J. Biol. Chem. |volume=265 |issue= 14 |pages= 7760–7 |year= 1990 |pmid= 1692315 |doi=  |name-list-format=vanc| author2=Ernst TJ | author3=Zhou LJ  | display-authors=3  | last4=Rambaldi  | first4=| last5=Spertini  | first5=O  | last6=Griffin  | first6=| last7=Tedder  | first7=TF }}
*{{cite journal  | author=Lasky LA, Singer MS, Dowbenko D, ''et al.'' |title=An endothelial ligand for L-selectin is a novel mucin-like molecule. |journal=Cell |volume=69 |issue= 6 |pages= 927-38 |year= 1992 |pmid= 1376638 |doi=  }}
*{{cite journal  | author=Bevilacqua M |title=Selectins: a family of adhesion receptors |journal=Cell |volume=67 |issue= 2 |pages= 233 |year= 1991 |pmid= 1717161 |doi=10.1016/0092-8674(91)90174-W |name-list-format=vanc| author2=Butcher E  | author3=Furie B  | display-authors=| last4=Furie  | first4=Bruce  | last5=Gallatin  | first5=M.  | last6=Gimbrone | first6=M.  | last7=Harlan  | first7=J. | last8=Kishimoto  | first8=K. | last9=Lasky  | first9=L. }}
*{{cite journal  | author=Ord DC, Ernst TJ, Zhou LJ, ''et al.'' |title=Structure of the gene encoding the human leukocyte adhesion molecule-1 (TQ1, Leu-8) of lymphocytes and neutrophils. |journal=J. Biol. Chem. |volume=265 |issue= 14 |pages= 7760-7 |year= 1990 |pmid= 1692315 |doi=  }}
*{{cite journal  | author=Tedder TF |title=Isolation and chromosomal localization of cDNAs encoding a novel human lymphocyte cell surface molecule, LAM-1. Homology with the mouse lymphocyte homing receptor and other human adhesion proteins |journal=J. Exp. Med. |volume=170 |issue= 1 |pages= 123–33 |year= 1989 |pmid= 2473156 |doi=10.1084/jem.170.1.123  | pmc=2189363 |name-list-format=vanc| author2=Isaacs CM  | author3=Ernst TJ  | display-authors=| last4=Demetri  | first4=GD  | last5=Adler  | first5=DA  | last6=Disteche  | first6=CM }}
*{{cite journal  | author=Bevilacqua M, Butcher E, Furie B, ''et al.'' |title=Selectins: a family of adhesion receptors. |journal=Cell |volume=67 |issue= 2 |pages= 233 |year= 1991 |pmid= 1717161 |doi=  }}
*{{cite journal  |vauthors=Camerini D, James SP, Stamenkovic I, Seed B |title=Leu-8/TQ1 is the human equivalent of the Mel-14 lymph node homing receptor |journal=Nature |volume=342 |issue= 6245 |pages= 78–82 |year= 1989 |pmid= 2509939 |doi= 10.1038/342078a0 }}
*{{cite journal  | author=Tedder TF, Isaacs CM, Ernst TJ, ''et al.'' |title=Isolation and chromosomal localization of cDNAs encoding a novel human lymphocyte cell surface molecule, LAM-1. Homology with the mouse lymphocyte homing receptor and other human adhesion proteins. |journal=J. Exp. Med. |volume=170 |issue= 1 |pages= 123-33 |year= 1989 |pmid= 2473156 |doi=  }}
*{{cite journal  |vauthors=Bowen BR, Nguyen T, Lasky LA |title=Characterization of a human homologue of the murine peripheral lymph node homing receptor |journal=J. Cell Biol. |volume=109 |issue= 1 |pages= 421–7 |year= 1989 |pmid= 2663882 |doi=10.1083/jcb.109.1.421  | pmc=2115458 }}
*{{cite journal  | author=Camerini D, James SP, Stamenkovic I, Seed B |title=Leu-8/TQ1 is the human equivalent of the Mel-14 lymph node homing receptor. |journal=Nature |volume=342 |issue= 6245 |pages= 78-82 |year= 1989 |pmid= 2509939 |doi= 10.1038/342078a0 }}
*{{cite journal  |vauthors=Siegelman MH, Weissman IL |title=Human homologue of mouse lymph node homing receptor: evolutionary conservation at tandem cell interaction domains |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=86 |issue= 14 |pages= 5562–6 |year= 1989 |pmid= 2664786 |doi=10.1073/pnas.86.14.5562  | pmc=336895 }}
*{{cite journal | author=Bowen BR, Nguyen T, Lasky LA |title=Characterization of a human homologue of the murine peripheral lymph node homing receptor. |journal=J. Cell Biol. |volume=109 |issue= 1 |pages= 421-7 |year= 1989 |pmid= 2663882 |doi}}
*{{cite journal  |vauthors=Bajorath J, Aruffo A |title=A template for generation and comparison of three-dimensional selectin models |journal=Biochem. Biophys. Res. Commun. |volume=216 |issue= 3 |pages= 1018–23 |year= 1995 |pmid= 7488174 |doi= 10.1006/bbrc.1995.2722 }}
*{{cite journal | author=Siegelman MH, Weissman IL |title=Human homologue of mouse lymph node homing receptor: evolutionary conservation at tandem cell interaction domains. |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=86 |issue= 14 |pages= 5562-6 |year= 1989 |pmid= 2664786 |doi=  }}
*{{cite journal  | author=Dianzani U |title=Modulation of CD4 lateral interaction with lymphocyte surface molecules induced by HIV-1 gp120 |journal=Eur. J. Immunol. |volume=25 |issue= 5 |pages= 1306–11 |year= 1995 |pmid= 7539755 |doi=10.1002/eji.1830250526 |name-list-format=vanc| author2=Bragardo M  | author3=Buonfiglio D  | display-authors=3  | last4=Redoglia  | first4=Valter  | last5=Funaro  | first5=Ada  | last6=Portoles  | first6=Pilar  | last7=Rojo  | first7=José  | last8=Malavasi  | first8=Fabio  | last9=Pileri  | first9=Alessandro }}
*{{cite journal  | author=Bajorath J, Aruffo A |title=A template for generation and comparison of three-dimensional selectin models. |journal=Biochem. Biophys. Res. Commun. |volume=216 |issue= 3 |pages= 1018-23 |year= 1995 |pmid= 7488174 |doi= 10.1006/bbrc.1995.2722 }}
*{{cite journal  |vauthors=Maruyama K, Sugano S |title=Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides |journal=Gene |volume=138 |issue= 1–2 |pages= 171–4 |year= 1994 |pmid= 8125298 |doi=10.1016/0378-1119(94)90802-8  }}
*{{cite journal | author=Dianzani U, Bragardo M, Buonfiglio D, ''et al.'' |title=Modulation of CD4 lateral interaction with lymphocyte surface molecules induced by HIV-1 gp120. |journal=Eur. J. Immunol. |volume=25 |issue= 5 |pages= 1306-11 |year= 1995 |pmid= 7539755 |doi=  }}
*{{cite journal  | author=Brenner B |title=L-selectin activates the Ras pathway via the tyrosine kinase p56lck |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=93 |issue= 26 |pages= 15376–81 |year= 1997 |pmid= 8986819 |doi=10.1073/pnas.93.26.15376  | pmc=26412  |name-list-format=vanc| author2=Gulbins E  | author3=Schlottmann K  | display-authors=3  | last4=Koppenhoefer  | first4=U  | last5=Busch  | first5=GL  | last6=Walzog  | first6=B  | last7=Steinhausen  | first7=M  | last8=Coggeshall  | first8=KM  | last9=Linderkamp  | first9=O  }}
*{{cite journal  | author=Maruyama K, Sugano S |title=Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides. |journal=Gene |volume=138 |issue= 1-2 |pages= 171-4 |year= 1994 |pmid= 8125298 |doi= }}
*{{cite journal  | author=Zöllner O |title=L-selectin from human, but not from mouse neutrophils binds directly to E-selectin |journal=J. Cell Biol. |volume=136 |issue= 3 |pages= 707–16 |year= 1997 |pmid= 9024699 |doi=10.1083/jcb.136.3.707  | pmc=2134294  |name-list-format=vanc| author2=Lenter MC  | author3=Blanks JE  | display-authors=3  | last4=Borges  | first4=E  | last5=Steegmaier  | first5=M  | last6=Zerwes  | first6=HG  | last7=Vestweber  | first7=D  }}
*{{cite journal  | author=Brenner B, Gulbins E, Schlottmann K, ''et al.'' |title=L-selectin activates the Ras pathway via the tyrosine kinase p56lck. |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=93 |issue= 26 |pages= 15376-81 |year= 1997 |pmid= 8986819 |doi=  }}
*{{cite journal  | author=Suzuki Y |title=Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library |journal=Gene |volume=200 |issue= 1–2 |pages= 149–56 |year= 1997 |pmid= 9373149 |doi=10.1016/S0378-1119(97)00411-3  |name-list-format=vanc| author2=Yoshitomo-Nakagawa K  | author3=Maruyama K  | display-authors=3  | last4=Suyama  | first4=A  | last5=Sugano  | first5=S  }}
*{{cite journal  | author=Zöllner O, Lenter MC, Blanks JE, ''et al.'' |title=L-selectin from human, but not from mouse neutrophils binds directly to E-selectin. |journal=J. Cell Biol. |volume=136 |issue= 3 |pages= 707-16 |year= 1997 |pmid= 9024699 |doi=  }}
*{{cite journal  | author=Prakobphol A |title=Human low-molecular-weight salivary mucin expresses the sialyl lewisx determinant and has L-selectin ligand activity |journal=Biochemistry |volume=37 |issue= 14 |pages= 4916–27 |year= 1998 |pmid= 9538010 |doi= 10.1021/bi972612a  |name-list-format=vanc| author2=Thomsson KA  | author3=Hansson GC  | display-authors=3  | last4=Rosen  | first4=Steven D.  | last5=Singer  | first5=Mark S.  | last6=Phillips  | first6=Nancy J.  | last7=Medzihradszky  | first7=Katalin F.  | last8=Burlingame  | first8=Alma L.  | last9=Leffler  | first9=Hakon }}
*{{cite journal  | author=Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, ''et al.'' |title=Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library. |journal=Gene |volume=200 |issue= 1-2 |pages= 149-56 |year= 1997 |pmid= 9373149 |doi= }}
*{{cite journal  | author=Sassetti C |title=Identification of podocalyxin-like protein as a high endothelial venule ligand for L-selectin: parallels to CD34 |journal=J. Exp. Med. |volume=187 |issue= 12 |pages= 1965–75 |year= 1998 |pmid= 9625756 |doi=10.1084/jem.187.12.1965  | pmc=2212365  |name-list-format=vanc| author2=Tangemann K  | author3=Singer MS  | display-authors=3  | last4=Kershaw  | first4=DB  | last5=Rosen  | first5=SD  }}
*{{cite journal  | author=Prakobphol A, Thomsson KA, Hansson GC, ''et al.'' |title=Human low-molecular-weight salivary mucin expresses the sialyl lewisx determinant and has L-selectin ligand activity. |journal=Biochemistry |volume=37 |issue= 14 |pages= 4916-27 |year= 1998 |pmid= 9538010 |doi= 10.1021/bi972612a }}
*{{cite journal  |vauthors=Malhotra R, Ward M, Sim RB, Bird MI |title=Identification of human complement Factor H as a ligand for L-selectin |journal=Biochem. J. |volume=341 |issue=  1|pages= 61–9 |year= 1999 |pmid= 10377245 |doi=10.1042/0264-6021:3410061  | pmc=1220330  }}
*{{cite journal | author=Sassetti C, Tangemann K, Singer MS, ''et al.'' |title=Identification of podocalyxin-like protein as a high endothelial venule ligand for L-selectin: parallels to CD34. |journal=J. Exp. Med. |volume=187 |issue= 12 |pages= 1965-75 |year= 1998 |pmid= 9625756 |doi=  }}
*{{cite journal  |vauthors=Bradley LM, Duncan DD, Tonkonogy S, Swain SL |title=CD4+ effector T cells in vivo: immunization results in a transient population of MEL-14-, CD45RB- helper cells that secretes interleukin 2 (IL-2), IL-3, IL-4, and interferon gamma |journal=J. Exp. Med. |volume=174 |issue=3  |pages= 547–59 |year= 1999 |pmid= 1678774 |doi=10.1084/jem.174.3.547 | pmc=2118927 }}
*{{cite journal  | author=Malhotra R, Ward M, Sim RB, Bird MI |title=Identification of human complement Factor H as a ligand for L-selectin. |journal=Biochem. J. |volume=341 ( Pt 1) |issue= |pages= 61-9 |year= 1999 |pmid= 10377245 |doi}}
}}
{{refend}}
{{refend}}


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{{NLM content}}
{{Cell-biology-stub}}
{{protein-stub}}
{{Immune receptors}}
{{Immune receptors}}
{{Cell adhesion molecules}}
{{Cell adhesion molecules}}
{{Clusters of differentiation}}
{{Clusters of differentiation}}
[[Category:Cell adhesion proteins]]
 
{{WikiDoc Sources}}
[[Category:Selectins]]
[[Category:Lymphocyte homing receptors]]

Revision as of 17:22, 2 September 2017

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Identifiers
Aliases
External IDsGeneCards: [1]
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

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n/a

RefSeq (protein)

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Location (UCSC)n/an/a
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View/Edit Human

L-selectin, also known as CD62L, is a cell adhesion molecule found on lymphocytes and the preimplantation embryo. It belongs to the selectin family of proteins, which recognize sialylated carbohydrate groups. It is cleaved by ADAM17.

SELL is a cell surface component that is a member of a family of adhesion/homing receptors that play important roles in lymphocyte-endothelial cell interactions. The molecule is composed of multiple domains: one homologous to lectins, one to epidermal growth factor, and two to the consensus repeat units found in C3/C4-binding proteins.[1]

Ligands

Function

L-selectin acts as a "homing receptor" for lymphocytes to enter secondary lymphoid tissues via high endothelial venules. Ligands present on endothelial cells will bind to lymphocytes expressing L-selectin, slowing lymphocyte trafficking through the blood, and facilitating entry into a secondary lymphoid organ at that point.[2] The receptor is commonly found on the cell surfaces of T cells. Naive T-lymphocytes, which have not yet encountered their specific antigen, need to enter secondary lymph nodes to encounter their antigen. Central memory T-lymphocytes, which have encountered antigen, express L-selectin to localize in secondary lymphoid organs. Here they reside ready to proliferate upon re-encountering antigen. Effector memory T-lymphocytes do not express L-selectin, as they circulate in the periphery and have immediate effector functions upon encountering antigen.

High expression of L-selectin on human bone marrow progenitor cells is an early sign of cells becoming committed to lymphoid differentiation.[3]

L-selectin is also present on the surface of human embryo trophoblasts prior to implantation into the uterus. Similar to its function in lymphocytes, L-selectin acts as a receptor to facilitate adhesion of the embryo to the site of invasion on the surface epithelium of the uterine endometrium. The embryo secretes human chorionic gonadotropin (hCG), which downregulates anti-adhesion factor, MUC-1, located on the uterine epithelium at the site of invasion. Removal of MUC-1 exposes the oligosaccharide ligands of the uterine epithelium, thus allowing binding by the L-selectin receptor of the trophopblast cell, followed by embryo adhesion and invasion.[4]

References

  1. "Entrez Gene: SELL selectin L (lymphocyte adhesion molecule 1)".
  2. Robbins SL, Cotran RS, Kumar V, Collins T (1998). Robbins Pathologic Basis of Disease. Philadelphia: W.B Saunders Company. ISBN 0-7216-7335-X.
  3. Kohn LA, Hao QL, Sasidharan R, Parekh C, Ge S, Zhu Y, Mikkola HK, Crooks GM (October 2012). "Lymphoid priming in human bone marrow begins before expression of CD10 with upregulation of L-selectin". Nat. Immunol. 13 (10): 963–71. doi:10.1038/ni.2405. PMID 22941246.
  4. James JL, Carter AM, Chamley LW (May 2012). "Human placentation from nidation to 5 weeks of gestation. Part I: What do we know about formative placental development following implantation?". Placenta. 33 (5): 327–34. doi:10.1016/j.placenta.2012.01.020. PMID 22374510.

External links

Further reading

This article incorporates text from the United States National Library of Medicine, which is in the public domain.