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Abstract: SA-PO592

SUMO1 Promote Mesangial Cell Proliferation Through Inhibiting Autophagy in a Cell Model of IgA Nephropathy

Session Information

Category: Glomerular Diseases

  • 1202 Glomerular Diseases: Immunology and Inflammation

Authors

  • Liu, Hong, The Second Xiangya Hospital, Central South University, Changsha, China
  • Tan, Xia, The Second Xiangya Hospital, Central South University, Changsha, China
Background

IgA nephropathy(IgAN) is a common form of primary glomerulonephritis and its main pathological changes are mesangial cell proliferation and matrix expansion. Autophagy inhibition may result in its mesangial cell proliferation and renal lesions. SUMOylation is a eukaryotic-reversible post-translational modification where SUMO are covalently attached to target proteins to regulate their properties. It is largely unclear if SUMOylation contributes to the pathogenesis of IgAN.

Methods

This study was designed to investigate the change of protein SUMO1 in mesangial cells of IgAN and its association with autophagy.

Results

We found the expression of SUMO1 was up-regulated in IgAN and aIgA1 stimulated mesangial cells. In aIgA1 stimulated mesangial cell model, we tested LC3 and p62, the autophagy-related proteins suggested the inhibition of autophagy. Silencing SUMO1 could down-regulate SUMO1 and SUMO1-p53, promote autophagy and lessen cell proliferation.

Conclusion

In the mesangial cells stimulated with aIgA1, SUMO1 may contribute to its cell proliferation through inhibited autophagy and SUMO1-p53 may play a role in this process.

The expression of SUMO1 in IgAN patients.

The expression of autophagy related proteins in mesangial cells stimulated with aIgA1.