Lupus nephritis pathophysiology

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Omer Kamal, M.D.[2], Cafer Zorkun, M.D., Ph.D. [3], Raviteja Guddeti, M.B.B.S. [4] , Aida Javanbakht, M.D.

Overview

Systemic lupus erythematosus (SLE, or lupus) is an autoimmune disease. This means there is a problem with the body's immune system. Normally, the immune system helps protect the body from harmful substances. But in patients with an autoimmune disease, the immune system cannot tell the difference between harmful substances and healthy ones. As a result, the immune system attacks otherwise healthy cells and tissue.

Pathophysiology

Pathogenesis

Immune system, genetic, and environmental factors are considered in the pathogenesis of Lupus Nephritis (LN). All tissues of the renal can be involved in LN.

- Immune system [1]:

plasma cells(PC) and B cells produce autoantibodies.

B cells in LN patients have more MicroRNAs (miRNAs) which modulate gene expression [2]. Over expression of the miR-30a could lower the level of Lyn (type of protein tyrosine kinases), and lower level of Lyn may cause deposition of immune complexes in the kidney [3][4]. 

High number of PCs in the medulla and activation of B cells cause proteinuria and severe damage in LN.

T cells are considered as coordinators of the adaptive immune response. The T-cell receptor (TCR) complex is a protein receptor composed of TCRα, β, and ζ chains. Decreased TCRζ chain expression may cause LN [5]. Th2 cells play role in LN by affecting B-lymphocyte activation. Th17 cells play role in LN by causing inflammation in nephrons. Stat-1 signaling play role on activity of IL-17 which produced by Th17 cells. IL-17–deficient patients are more susceptible to SLE [6].

Overexpression of apolipoprotein L1 (APOL1), a protein that induce autophagic cell death, may cause fibrosis in renal and ESRD in patients with LN [7] [8].

Low level of myotubularin-related phosphatase 3 (MTMR3), types of the phosphatidylinositol 3-phosphate that plays a role in initiating autophagy, may cause LN [9].

Macrophages play role in presenting antigens, removing of dying cells, and producing cytokines. Increase expression of Sialoadhesin (Sn), a macrophage-restricted adhesion molecule may play a role in causing sever LN [10].

Tumor necrosis factor (TNF) is a cytokine (cell signaling protein) that play role in inflammation process. One of the sub types of TNF is TNF-like weak inducer of apoptosis (TWEAK) which has an important role in causing LN [11]. Fn14 ( TWEAK receptor) is interacted with TWEAK on renal mesangial, endothelial, tubular cells and podocytes [12]. This interactions produce multiple inflammatory mediators which lead to LN.

Increased expression of interferon alpha (IFN-α) inducible RNA transcripts by mononuclear cells. 

- Repair impairment and Tissue Scarring:

 Impairment in regulation and repair may cause tissue scars like [13]:

- Environmental factors:

  • Geographical distribution :

LN is more severe in African, Hispanics and Asian patients with SLE. LN is associated with temperature and season [16]. Most flares are happening in spring and hot weather.

Genetics

interaction and mutation between below genes from multiple categories may cause severe LN[17] [18] [19] [20].

Epigenetic modification [34]:

Hypomethylated genes in B lymphocytes activate transcription, and cause production of many anti-DNA antibodies[35].

Histone is a protein in chromatin that play role in gene regulation.

Acetylation of histones are concidered targets for autoantibodies in LN.

Non-coding RNA sequences that play role in gene regulation by degradation of mRNA and protein translation blockage.

Some miRNAs are increased in LN like miR-142-3p and miR-181 and some are decreased like miR-106a, miR-17, miR-20a, miR-92a and miR-203 [36].

 These changes cause dysregulation of genes and LN.

Associated Conditions

Morbidity and mortality are increased in patients with LN because of aggressive immunosuppressive therapy.

Anti-DNA, anti-nucleosome and anti-histone Abs are associated with sever poor prognosis LN [37].

Gross Pathology

  • On gross pathology hypertrophy and pallor of the kidney will be seen.
Gross, enlarged very pale kidneys with flea bite or ectasia. A good example of kidneys from a patient with nephrotic syndrome (subacute glomerulonephritis)
Gross cut surface pale kidneys typical of nephrotic syndrome (subacute glomerulonephritis)
Gross natural color nice external and cut surface view of uniformly scarred and moderately shrunken kidneys

Microscopic Pathology

6 classification for LN on microscopy:

Class Name Light Microscopy Light microscopy previews Electron microscopy
I Minimal mesangial lupus nephritis Normal Immune deposits in mesangial
II Mesangial proliferative lupus nephritis Mesangial widening and hypercellularity
Adapted from Librepathology
 Immune deposits in subepithelial or subendothelial
III Focal lupus nephritis Necrotizing and sclerosing lesions in < 50% glomeruli
Adapted from Librepathology
 Fibrinoid necrosis and crescents in glomeruli, Immune deposits in subendothelial space of the glomerular capillary and mesangium
IV Diffuse lupus nephritis mesangial, endocapillary and mesangiocapillary involvement > 50%
Adapted from Librepathology
 Diffuse wire loop deposits, extensive subendothelial deposits
V Lupus membranous nephropathy thickening of capillary of the glomeruli Global or segmental subepithelial immune deposits
VI Advanced sclerosing lupus nephritis Sclerosis of the glomeruli > 90%
Adapted from Librepathology
 Global or segmental subepithelial immune deposits
Kidney: Lupus Erythematosus: Micro high mag H&E. A nice example of a lesion of chronic glomerulonephritis with lobular scarring. A fibrous type crescent.

Videos

References

References

Kidney: Lupus Erythematosus: Micro high mag H&E. A nice example of a lesion of chronic glomerulonephritis with lobular scarring. A fibrous type crescent.



Videos

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References

  1. ↑ Schwartz N, Goilav B, Putterman C (September 2014). "The pathogenesis, diagnosis and treatment of lupus nephritis". Curr Opin Rheumatol. 26 (5): 502–9. doi:10.1097/BOR.0000000000000089. PMC 4221732. PMID 25014039.
  2. ↑ He L, Hannon GJ (July 2004). "MicroRNAs: small RNAs with a big role in gene regulation". Nat. Rev. Genet. 5 (7): 522–31. doi:10.1038/nrg1379. PMID 15211354.
  3. ↑ Yu CC, Yen TS, Lowell CA, DeFranco AL (January 2001). "Lupus-like kidney disease in mice deficient in the Src family tyrosine kinases Lyn and Fyn". Curr. Biol. 11 (1): 34–8. PMID 11166177.
  4. ↑ Liu Y, Dong J, Mu R, Gao Y, Tan X, Li Y, Li Z, Yang G (June 2013). "MicroRNA-30a promotes B cell hyperactivity in patients with systemic lupus erythematosus by direct interaction with Lyn". Arthritis Rheum. 65 (6): 1603–11. doi:10.1002/art.37912. PMID 23450709.
  5. ↑ Munroe ME, James JA (September 2015). "Genetics of Lupus Nephritis: Clinical Implications". Semin. Nephrol. 35 (5): 396–409. doi:10.1016/j.semnephrol.2015.08.002. PMC 4653095. PMID 26573543.
  6. ↑ Amarilyo G, Lourenço EV, Shi FD, La Cava A (July 2014). "IL-17 promotes murine lupus". J. Immunol. 193 (2): 540–3. doi:10.4049/jimmunol.1400931. PMID 24920843.
  7. ↑ Wan G, Zhaorigetu S, Liu Z, Kaini R, Jiang Z, Hu CA (August 2008). "Apolipoprotein L1, a novel Bcl-2 homology domain 3-only lipid-binding protein, induces autophagic cell death". J. Biol. Chem. 283 (31): 21540–9. doi:10.1074/jbc.M800214200. PMC 2490785. PMID 18505729.
  8. ↑ Freedman BI, Langefeld CD, Andringa KK, Croker JA, Williams AH, Garner NE, Birmingham DJ, Hebert LA, Hicks PJ, Segal MS, Edberg JC, Brown EE, Alarcón GS, Costenbader KH, Comeau ME, Criswell LA, Harley JB, James JA, Kamen DL, Lim SS, Merrill JT, Sivils KL, Niewold TB, Patel NM, Petri M, Ramsey-Goldman R, Reveille JD, Salmon JE, Tsao BP, Gibson KL, Byers JR, Vinnikova AK, Lea JP, Julian BA, Kimberly RP (February 2014). "End-stage renal disease in African Americans with lupus nephritis is associated with APOL1". Arthritis Rheumatol. 66 (2): 390–6. doi:10.1002/art.38220. PMC 4002759. PMID 24504811.
  9. ↑ Taguchi-Atarashi N, Hamasaki M, Matsunaga K, Omori H, Ktistakis NT, Yoshimori T, Noda T (April 2010). "Modulation of local PtdIns3P levels by the PI phosphatase MTMR3 regulates constitutive autophagy". Traffic. 11 (4): 468–78. doi:10.1111/j.1600-0854.2010.01034.x. PMID 20059746.
  10. ↑ Biesen R, Demir C, Barkhudarova F, Grün JR, Steinbrich-Zöllner M, Backhaus M, Häupl T, Rudwaleit M, Riemekasten G, Radbruch A, Hiepe F, Burmester GR, Grützkau A (April 2008). "Sialic acid-binding Ig-like lectin 1 expression in inflammatory and resident monocytes is a potential biomarker for monitoring disease activity and success of therapy in systemic lupus erythematosus". Arthritis Rheum. 58 (4): 1136–45. doi:10.1002/art.23404. PMID 18383365.
  11. ↑ Lu J, Kwan BC, Lai FM, Choi PC, Tam LS, Li EK, Chow KM, Wang G, Li PK, Szeto CC (May 2011). "Gene expression of TWEAK/Fn14 and IP-10/CXCR3 in glomerulus and tubulointerstitium of patients with lupus nephritis". Nephrology (Carlton). 16 (4): 426–32. doi:10.1111/j.1440-1797.2011.01449.x. PMID 21303425.
  12. ↑ Campbell S, Burkly LC, Gao HX, Berman JW, Su L, Browning B, Zheng T, Schiffer L, Michaelson JS, Putterman C (February 2006). "Proinflammatory effects of TWEAK/Fn14 interactions in glomerular mesangial cells". J. Immunol. 176 (3): 1889–98. PMID 16424220.
  13. ↑ Liu Y, Anders HJ (2014). "Lupus nephritis: from pathogenesis to targets for biologic treatment". Nephron Clin Pract. 128 (3–4): 224–31. doi:10.1159/000368581. PMID 25401461.
  14. ↑ Smeets B, Kuppe C, Sicking EM, Fuss A, Jirak P, van Kuppevelt TH, Endlich K, Wetzels JF, Gröne HJ, Floege J, Moeller MJ (July 2011). "Parietal epithelial cells participate in the formation of sclerotic lesions in focal segmental glomerulosclerosis". J. Am. Soc. Nephrol. 22 (7): 1262–74. doi:10.1681/ASN.2010090970. PMC 3137574. PMID 21719782.
  15. ↑ Ryu M, Migliorini A, Miosge N, Gross O, Shankland S, Brinkkoetter PT, Hagmann H, Romagnani P, Liapis H, Anders HJ (December 2012). "Plasma leakage through glomerular basement membrane ruptures triggers the proliferation of parietal epithelial cells and crescent formation in non-inflammatory glomerular injury". J. Pathol. 228 (4): 482–94. doi:10.1002/path.4046. PMID 22553158.
  16. ↑ Li Y, Fang X, Li QZ (June 2013). "Biomarker profiling for lupus nephritis". Genomics Proteomics Bioinformatics. 11 (3): 158–65. doi:10.1016/j.gpb.2013.05.003. PMC 4357827. PMID 23732627.
  17. ↑ Mohan C, Putterman C (June 2015). "Genetics and pathogenesis of systemic lupus erythematosus and lupus nephritis". Nat Rev Nephrol. 11 (6): 329–41. doi:10.1038/nrneph.2015.33. PMID 25825084.
  18. ↑ Morel L, Croker BP, Blenman KR, Mohan C, Huang G, Gilkeson G, Wakeland EK (June 2000). "Genetic reconstitution of systemic lupus erythematosus immunopathology with polycongenic murine strains". Proc. Natl. Acad. Sci. U.S.A. 97 (12): 6670–5. PMC 18697. PMID 10841565.
  19. ↑ Xie S, Mohan C (February 2004). "Divide and conquer--the power of congenic strains". Clin. Immunol. 110 (2): 109–11. doi:10.1016/j.clim.2003.09.007. PMID 15003808.
  20. ↑ Henry T, Mohan C (2005). "Systemic lupus erythematosus--recent clues from congenic strains". Arch. Immunol. Ther. Exp. (Warsz.). 53 (3): 207–12. PMID 15995581.
  21. ↑ Crispín JC, Apostolidis SA, Rosetti F, Keszei M, Wang N, Terhorst C, Mayadas TN, Tsokos GC (April 2012). "Cutting edge: protein phosphatase 2A confers susceptibility to autoimmune disease through an IL-17-dependent mechanism". J. Immunol. 188 (8): 3567–71. doi:10.4049/jimmunol.1200143. PMC 3324672. PMID 22422882.
  22. ↑ Jacob CO, Zang S, Li L, Ciobanu V, Quismorio F, Mizutani A, Satoh M, Koss M (August 2003). "Pivotal role of Stat4 and Stat6 in the pathogenesis of the lupus-like disease in the New Zealand mixed 2328 mice". J. Immunol. 171 (3): 1564–71. PMID 12874250.
  23. ↑ Zhou XJ, Cheng FJ, Qi YY, Zhao MH, Zhang H (2013). "A replication study from Chinese supports association between lupus-risk allele in TNFSF4 and renal disorder". Biomed Res Int. 2013: 597921. doi:10.1155/2013/597921. PMC 3713374. PMID 23936824.
  24. ↑ Triantafyllopoulou A, Franzke CW, Seshan SV, Perino G, Kalliolias GD, Ramanujam M, van Rooijen N, Davidson A, Ivashkiv LB (February 2010). "Proliferative lesions and metalloproteinase activity in murine lupus nephritis mediated by type I interferons and macrophages". Proc. Natl. Acad. Sci. U.S.A. 107 (7): 3012–7. doi:10.1073/pnas.0914902107. PMC 2840310. PMID 20133703.
  25. ↑ Clynes R, Dumitru C, Ravetch JV (February 1998). "Uncoupling of immune complex formation and kidney damage in autoimmune glomerulonephritis". Science. 279 (5353): 1052–4. PMID 9461440.
  26. ↑ Dang J, Shan S, Li J, Zhao H, Xin Q, Liu Y, Bian X, Liu Q (June 2014). "Gene-gene interactions of IRF5, STAT4, IKZF1 and ETS1 in systemic lupus erythematosus". Tissue Antigens. 83 (6): 401–8. doi:10.1111/tan.12349. PMID 24697319.
  27. ↑ Zhou TB, Liu YG, Lin N, Qin YH, Huang K, Shao MB, Peng DD (April 2012). "Relationship between angiotensin-converting enzyme insertion/deletion gene polymorphism and systemic lupus erythematosus/lupus nephritis: a systematic review and metaanalysis". J. Rheumatol. 39 (4): 686–93. doi:10.3899/jrheum.110863. PMID 22337243.
  28. ↑ Liu K, Li QZ, Delgado-Vega AM, Abelson AK, Sánchez E, Kelly JA, Li L, Liu Y, Zhou J, Yan M, Ye Q, Liu S, Xie C, Zhou XJ, Chung SA, Pons-Estel B, Witte T, de Ramón E, Bae SC, Barizzone N, Sebastiani GD, Merrill JT, Gregersen PK, Gilkeson GG, Kimberly RP, Vyse TJ, Kim I, D'Alfonso S, Martin J, Harley JB, Criswell LA, Wakeland EK, Alarcón-Riquelme ME, Mohan C (April 2009). "Kallikrein genes are associated with lupus and glomerular basement membrane-specific antibody-induced nephritis in mice and humans". J. Clin. Invest. 119 (4): 911–23. doi:10.1172/JCI36728. PMC 2662554. PMID 19307730.
  29. ↑ Brown EE, Edberg JC, Kimberly RP (December 2007). "Fc receptor genes and the systemic lupus erythematosus diathesis". Autoimmunity. 40 (8): 567–81. doi:10.1080/08916930701763710. PMID 18075791.
  30. ↑ Apostolidis SA, Rauen T, Hedrich CM, Tsokos GC, Crispín JC (September 2013). "Protein phosphatase 2A enables expression of interleukin 17 (IL-17) through chromatin remodeling". J. Biol. Chem. 288 (37): 26775–84. doi:10.1074/jbc.M113.483743. PMC 3772223. PMID 23918926.
  31. ↑ Bergtold A, Gavhane A, D'Agati V, Madaio M, Clynes R (November 2006). "FcR-bearing myeloid cells are responsible for triggering murine lupus nephritis". J. Immunol. 177 (10): 7287–95. PMID 17082647.
  32. ↑ Zhou XJ, Lv JC, Cheng WR, Yu L, Zhao MH, Zhang H (2010). "Association of TLR9 gene polymorphisms with lupus nephritis in a Chinese Han population". Clin. Exp. Rheumatol. 28 (3): 397–400. PMID 20497632.
  33. ↑ Kim SJ, Zou YR, Goldstein J, Reizis B, Diamond B (October 2011). "Tolerogenic function of Blimp-1 in dendritic cells". J. Exp. Med. 208 (11): 2193–9. doi:10.1084/jem.20110658. PMC 3201204. PMID 21948081.
  34. ↑ Li Y, Fang X, Li QZ (June 2013). "Biomarker profiling for lupus nephritis". Genomics Proteomics Bioinformatics. 11 (3): 158–65. doi:10.1016/j.gpb.2013.05.003. PMC 4357827. PMID 23732627.
  35. ↑ Renaudineau Y, Youinou P (2011). "Epigenetics and autoimmunity, with special emphasis on methylation". Keio J Med. 60 (1): 10–6. PMID 21460598.
  36. ↑ Carlsen AL, Schetter AJ, Nielsen CT, Lood C, Knudsen S, Voss A, Harris CC, Hellmark T, Segelmark M, Jacobsen S, Bengtsson AA, Heegaard NH (May 2013). "Circulating microRNA expression profiles associated with systemic lupus erythematosus". Arthritis Rheum. 65 (5): 1324–34. doi:10.1002/art.37890. PMID 23401079.
  37. ↑ Sui M, Sui M, Lin Q, Xu Z, Han X, Xie R, Jia X, Guo X, Zhang W, Guan X, Ren H (February 2013). "Simultaneous positivity for anti-DNA, anti-nucleosome and anti-histone antibodies is a marker for more severe lupus nephritis". J. Clin. Immunol. 33 (2): 378–87. doi:10.1007/s10875-012-9825-6. PMID 23100145.

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References

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