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Comparative Proteomic Analysis of Whole Kidney, Medulla, and Cortical Tubules in Diabetic Pathogenesis of Kidney Injury in Mice
Published on: May 2, 2025
Glomerular 20-HETE, EETs, and TGF-beta1 in diabetic nephropathy.
Pengcheng Luo1, Yiqiang Zhou, Hsin-Hsin Chang
1Department of Physiology, Medical College of Georgia, Augusta, Georgia 30912, USA.
American Journal of Physiology. Renal Physiology
|January 9, 2009
Summary
Hyperglycemia in diabetic nephropathy (DN) elevates transforming growth factor-beta1 (TGF-beta1) while decreasing 20-HETE and EETs, contributing to glomerular damage. Clofibrate treatment reversed these changes, reducing proteinuria.
Area of Science:
- Nephrology
- Endocrinology
- Biochemistry
Background:
- Diabetic nephropathy (DN) is characterized by proteinuria, linked to increased glomerular permeability.
- Transforming growth factor-beta1 (TGF-beta1) exacerbates albuminuria, while 20-HETE and epoxyeicosatrienoic acids (EETs) offer protection.
Purpose of the Study:
- To investigate the effects of hyperglycemia and hyperlipidemia on glomerular 20-HETE, EETs, and TGF-beta1 levels.
- To understand the role of these factors in the early stages of DN.
Main Methods:
- Rats were divided into normal diet, high-fat diet, streptozotocin-induced diabetes, and high-fat/streptozotocin groups.
- Key biochemical markers, renal hemodynamics, and gene/protein expression (CYP4A, CYP2C, CYP2J, TGF-beta1) were analyzed.
- Therapeutic effects of clofibrate on STZ-induced diabetic rats were evaluated.
Main Results:
- Hyperglycemia and hyperlipidemia significantly elevated blood glucose, albuminuria, lipids, and kidney-to-body weight ratio.
- Glomerular expression of 20-HETE (CYP4A) and EETs (CYP2C, CYP2J) producing enzymes decreased in diabetic rats.
- Glomerular TGF-beta1 levels increased, and clofibrate treatment normalized these changes and reduced proteinuria.
Conclusions:
- Hyperglycemia in early DN reduces protective 20-HETE and EETs while increasing damaging TGF-beta1.
- These molecular changes contribute to glomerular damage and albuminuria in DN.
- Targeting these pathways, such as with clofibrate, may offer therapeutic benefits for DN.
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