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JCI Insight. 2018 Nov 15;3(22). pii: 123482. doi: 10.1172/jci.insight.123482. [Epub ahead of print]

Tyro3 is a podocyte protective factor in glomerular disease.

Author information

1
Department of Medicine/Nephrology, Icahn School of Medicine at Mount Sinai, New York, New York, USA.
2
National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China.
3
Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing, China.
4
Division of Nephrology, University of Michigan, Ann Arbor, Michigan, USA.
5
Chronic Kidney Disease Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH, Bethesda, Maryland, USA.
6
Department of Nephrology, Hangzhou Hospital of Traditional Chinese Medicine, Zhejiang Chinese Medical University, China.
7
Renal Section, James J Peters Veterans Affair Medical Center, Bronx, New York, USA.

Abstract

Our previous work demonstrated a protective role of protein S in early diabetic kidney disease (DKD). Protein S exerts antiinflammatory and antiapoptotic effects through the activation of TYRO3, AXL, and MER (TAM) receptors. Among the 3 TAM receptors, we showed that the biological effects of protein S were mediated largely by TYRO3 in diabetic kidneys. Our data now show that TYRO3 mRNA expression is highly enriched in human glomeruli and that TYRO3 protein is expressed in podocytes. Interestingly, glomerular TYRO3 mRNA expression increased in mild DKD but was suppressed in progressive DKD, as well as in focal segmental glomerulosclerosis (FSGS). Functionally, morpholino-mediated knockdown of tyro3 altered glomerular filtration barrier development in zebrafish larvae, and genetic ablation of Tyro3 in murine models of DKD and Adriamycin-induced nephropathy (ADRN) worsened albuminuria and glomerular injury. Conversely, the induction of TYRO3 overexpression specifically in podocytes significantly attenuated albuminuria and kidney injury in mice with DKD, ADRN, and HIV-associated nephropathy (HIVAN). Mechanistically, TYRO3 expression was suppressed by activation of TNF-α/NF-κB pathway, which may contribute to decreased TYRO3 expression in progressive DKD and FSGS, and TYRO3 signaling conferred antiapoptotic effects through the activation of AKT in podocytes. In conclusion, TYRO3 plays a critical role in maintaining normal podocyte function and may be a potential new drug target to treat glomerular diseases.

KEYWORDS:

Apoptosis; Chronic kidney disease; Diabetes; Nephrology

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