期刊
JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY
卷 30, 期 11, 页码 2073-2090出版社
AMER SOC NEPHROLOGY
DOI: 10.1681/ASN.2018111162
关键词
necroptosis; integrin-linked kinase (ILK); collecting duct principal cells
资金
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) [R01-DK-096015, R21-DK-092619]
- NephCure Kidney International
- Gottschalk research grant from the American Society of Nephrology
- S&R Foundation Ryuji Ueno award
- MGH Executive Committee on Research support
- Boston Area Diabetes and Endocrinology Research Center (NIDDK) [DK-57521]
- Center for the Study of Inflammatory Bowel Disease (NIDDK) [DK43351]
- NIH [R01-DK078226]
- MGH Executive Committee on Research
- National Natural Science Foundation of China [81620108029]
Background Necroptosis is a newly discovered cell death pathway that plays a critical role in AKI. The involvement of integrin-linked kinase (ILK) in necroptosis has not been studied. Methods We performed experiments in mice with an Ilk deletion in collecting duct (CD) principal cells (PCs), and cultured tubular epithelial cells treated with an ILK inhibitor or ILK siRNA knockdown. Results Ilk deletion in CD PCs resulted in acute tubular injury and early mortality in mice. Progressive interstitial fibrosis and inflammation associated with the activation of the canonical TGF-beta signaling cascade were detected in the kidneys of the mice lacking ILK in the CD PCs. In contrast to the minimal apoptosis detected in the animals' injured CDs, widespread necroptosis was present in ILK-deficient PCs, characterized by cell swelling, deformed mitochondria, and rupture of plasma membrane. In addition, ILK deficiency resulted in increased expression and activation of necroptotic proteins MLKL and RIPK3, and membrane translocation of MLKL in CD PCs. ILK inhibition and siRNA knockdown reduced cell survival in cultured tubular cells, concomitant with increased membrane accumulation of MLKL and/or phospho-MLKL. Administration of a necroptosis inhibitor, necrostatin-1, blocked cell death in vitro and significantly attenuated inflammation, interstitial fibrosis, and renal failure in ILK-deficient mice. Conclusions The study demonstrates the critical involvement of ILK in necroptosis through modulation of the RIPK3 and MLKL pathway and highlights the contribution of CD PC injury to the development of inflammation and interstitial fibrosis of the kidney.
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