Identification of Common Genes Regulated by ER Stress During the Development of Diabetic Nephropathy Based on Human...

Area of Science:

• Nephrology
• Endocrinology
• Molecular Biology

Background:

• Diabetic nephropathy (DN) is a severe complication of diabetes, leading to kidney failure.
• Current treatments for DN are limited due to its complex pathogenesis, involving endoplasmic reticulum (ER) stress.
• Understanding mechanisms to reduce ER stress is crucial for developing effective DN therapies.

Purpose of the Study:

• To investigate the protective effects of 4-phenylbutyrate (4-PBA), an ER stress inhibitor, on diabetic nephropathy.
• To explore the molecular mechanisms, including gene expression networks, underlying 4-PBA's action in DN.
• To evaluate 4-PBA's impact on ER stress markers and autophagy in diabetic kidneys.

Main Methods:

• A mouse model of diabetic nephropathy was established using C57BL/6 mice with a high-fat diet, streptozotocin, and unilateral nephrectomy.
• Mice were treated with 4-phenylbutyrate (4-PBA) via intraperitoneal injection for 6 weeks.
• Gene expression network analysis was employed to identify regulatory molecules affected by 4-PBA.

Main Results:

• 4-PBA treatment significantly improved renal structure and function, reducing albuminuria, podocyte loss, and kidney injury.
• 4-PBA decreased ER stress markers and enhanced autophagy activity in the kidneys of diabetic mice.
• The treatment also attenuated the complement C1q pathway, NADPH oxidase complex, and chemokine expression, reducing inflammation and cell death.

Conclusions:

• Inhibition of endoplasmic reticulum (ER) stress using 4-phenylbutyrate (4-PBA) demonstrates significant protective effects against diabetic nephropathy.
• 4-PBA ameliorates DN by reducing ER stress, enhancing autophagy, and modulating inflammatory pathways.
• Targeting ER stress represents a promising therapeutic avenue for managing diabetic nephropathy.