Decrease of bone morphogenetic protein-7 (BMP-7) and its type II receptor (BMP-RII) in kidney of type 1-like diabetic...

Area of Science:

• Nephrology
• Endocrinology
• Molecular Biology

Background:

• Diabetic nephropathy is characterized by renal damage, with Bone Morphogenetic Protein-7 (BMP-7) expression diminishing early in disease progression.
• The roles of BMP-7 and its type II receptor (BMP-RII) in high glucose-induced oxidative stress during diabetic nephropathy remain incompletely understood.

Purpose of the Study:

• To investigate the changes in BMP-7 and BMP-RII expression in diabetic nephropathy.
• To determine the effects of insulin, phloridzin, and the antioxidant tiron on renal function, fibronectin expression, and BMP-7/BMP-RII levels in diabetic rats.
• To elucidate the mechanisms by which these treatments impact BMP-7 and BMP-RII expression, particularly concerning oxidative stress.

Main Methods:

• Utilized streptozotocin-induced diabetic rats to model diabetic nephropathy.
• Administered treatments including insulin, phloridzin, and the antioxidant tiron.
• Assessed renal function, fibronectin expression, and BMP-7/BMP-RII expression levels.
• Confirmed findings in high glucose-exposed mesangial cells.

Main Results:

• Insulin, phloridzin, and tiron treatments improved renal function and reduced fibronectin expression in diabetic rats.
• Insulin and phloridzin reversed hyperglycemia-induced attenuation of BMP-7 and BMP-RII expression by correcting high glucose levels.
• Tiron reversed the decrease in BMP-7 and BMP-RII expression by reducing oxidative stress, independent of glucose levels.

Conclusions:

• High glucose-induced oxidative stress contributes to the decrease in renal BMP-7 and BMP-RII expression during diabetic nephropathy.
• Reducing oxidative stress is a key mechanism for improving renal function and restoring BMP-7/BMP-RII expression in this condition.
• Targeting oxidative stress may offer a therapeutic strategy for managing diabetic nephropathy.