SH3YL1 protein as a novel biomarker for diabetic nephropathy in type 2 diabetes mellitus.

Affiliation

Choi GS(1), Min HS(2), Cha JJ(1), Lee JE(2), Ghee JY(1), Yoo JA(1), Kim KT(3), Kang YS(1), Han SY(4), Bae YS(5), Lee SR(5), Yoo JY(5), Moon SH(6), Lee SJ(6), Cha DR(7).
Author information:
(1)Department of Internal Medicine, Division of Nephrology, Korea University, South Korea.
(2)Department of Internal Medicine, Division of Nephrology, Wonkwang University, South Korea.
(3)Department of Internal Medicine, BHS Hanseo Hospital, Busan, South Korea.
(4)Department of Internal Medicine, Inje University, Ilsan Paik Hospital, Goyang, South Korea.
(5)Department of Life Science, Division of Life and Pharmaceutical Sciences, Ewha Woman's University, South Korea.
(6)Aptabio Therapeutics Inc, South Korea.
(7)Department of Internal Medicine, Division of Nephrology, Korea University, South Korea. Electronic address: [Email]

Abstract

BACKGROUND AND AIMS: Oxidative stress contributes to development of diabetic nephropathy. We implicated SH3YL1 in oxidative stress-induced inflammation and examined whether SH3YL1 could be used as a new biomarker of diabetic nephropathy. METHODS AND RESULTS: In this study, we investigated the relationship between plasma level of SH3YL1 and diabetic nephropathy in patients with type 2 diabetes. In addition, we examined the physiological role of SH3YL1 in db/db mice and cultured podocytes. Plasma SH3YL1 concentration was significantly higher in patients with diabetes than in controls, even in normoalbuminuric patients, and was markedly increased in the macroalbuminuria group. Plasma SH3YL1 level was positively correlated with systolic blood pressure, HOMA-IR, postprandial blood glucose, plasma level of retinol binding protein 4 (RBP 4), and urinary albumin excretion (UAE) and was inversely correlated with BMI. Regression analysis showed that plasma level of RBP 4, UAE, and BMI were the only independent determinants of plasma SH3YL1 concentration. In db/db mice, plasma and renal SH3YL1 levels were significantly increased in mice with diabetes compared with control mice. In cultured podocytes, high glucose and angiotensin II stimuli markedly increased SH3YL1 synthesis. CONCLUSION: These findings suggest that plasma level of SH3YL1 offers a promising new biomarker for diabetic nephropathy.