Apocynin Mitigates Diabetic Muscle Atrophy by Lowering Muscle Triglycerides and Oxidative Stress

Area of Science:

• Biochemistry
• Physiology
• Endocrinology

Background:

• Diabetic muscular atrophy is a debilitating complication of diabetes mellitus.
• Mechanisms involve altered proteolytic pathways, oxidative stress, and lipid accumulation.
• NADPH oxidase (NOX) enzymes contribute to oxidative damage and insulin resistance.

Purpose of the Study:

• To investigate the effects of apocynin, a NOX inhibitor, on muscle atrophy in diabetic rats.
• To evaluate apocynin's impact on biochemical and molecular mechanisms of muscle wasting.

Main Methods:

• Diabetes induced in Wistar rats using streptozotocin.
• Apocynin treatment administered for 8 weeks.
• Assessed muscle weight, lipid profiles, oxidative stress markers, and gene expression (qRT-PCR).

Main Results:

• Apocynin reduced blood glucose, improved body weight, and lowered lipids.
• Significant increases in muscle weight (especially EDL) and fiber size observed.
• Decreased expression of atrophy-related genes (MuRF-1, atrogin-1, myostatin) and p47phox.
• Increased expression of PGC-1α and follistatin.

Conclusions:

• Apocynin demonstrates myoprotective effects against diabetic muscle atrophy.
• It mitigates muscle wasting by reducing oxidative stress and atrogene expression.
• Apocynin positively influences lipid metabolism and muscle regeneration pathways.