Progesterone modulates diabetes/hyperglycemia-induced changes in the central nervous system and sciatic nerve

Area of Science:

• Neuroscience
• Endocrinology
• Diabetology

Background:

• Diabetes/hyperglycemia causes pathological changes in the central and peripheral nervous systems.
• These changes include altered angiogenesis, inflammation, and tissue injury markers.
• The neuroprotective potential of progesterone (P4) in diabetes is not fully understood.

Purpose of the Study:

• To investigate the effect of progesterone (P4) treatment on diabetes/hyperglycemia-induced pathological changes in male rats.
• To assess P4's impact on markers of angiogenesis, inflammation, and tissue injury in neural tissues.
• To examine P4's regenerative effect on intra-epidermal nerve fibers (IENF) in diabetic rats.

Main Methods:

• Male rats were rendered hyperglycemic using streptozotocin (STZ).
• Progesterone (P4) treatment commenced post-hyperglycemia confirmation; body weight and blood glucose monitored weekly for 5 weeks.
• Behavioral testing, Western blot analysis for VEGF, IL-6, CD11b, NG2, COX2, MMP-2, and IENF density assessment were performed.

Main Results:

• P4 treatment reduced hyperglycemia-induced body weight loss and lowered blood glucose levels.
• Diabetic rats exhibited hyperactivity, which was normalized by P4 treatment.
• P4 normalized the upregulation of VEGF, IL-6, CD11b, NG2, COX2, and MMP-2, and restored reduced IENF densities.

Conclusions:

• Progesterone (P4) treatment effectively counteracted several chronic pathological responses to STZ-induced diabetes in rats.
• P4 demonstrated neuroprotective effects by normalizing markers of angiogenesis, inflammation, and tissue injury in neural tissues.
• P4 treatment promoted nerve regeneration, evidenced by the normalization of intra-epidermal nerve fiber densities.