Prostaglandin D2 Synthase Resistance in Diabetic Mice

Diabetic mice exhibit resistance to prostaglandin D2 synthase inhibition of cell cycle progression and migration of vascular smooth muscle cells. Recent research has shed light on the regulation of vascular smooth muscle cell proliferation, migration, and apoptosis, highlighting its role in the atherosclerotic process. Scientists in the United States have investigated the effects of lipocalin-type prostaglandin D2 synthase (L-PGDS) on vascular smooth muscle cell (VSMC) behavior in wild-type and type 2 diabetic models. The study reveals that wild-type VSMCs are sensitive to L-PGDS inhibition, while diabetic cells resist its effects.

Key Takeaways:

• Diabetic mice resist prostaglandin D2 synthase inhibition of cell cycle progression and migration of vascular smooth muscle cells.
• Lipocalin-type prostaglandin D2 synthase (L-PGDS) delays serum-induced cell cycle progression from the G1 to S phase in wild-type VSMCs.
• Gene array analysis and protein expression studies demonstrate L-PGDS's effects on cyclin-dependent kinase-2, p21, and cyclin D1 in wild-type cells.
• Dehydroemetine, a synthetic L-PGDS inhibitor, may be beneficial in treating atherosclerosis in diabetic patients.
• Type 2 diabetic VSMCs exhibit a 2.5-fold increase in apoptosis and a 10-fold increase in L-PGDS uptake, suppressing hyperproliferation.
• The study proposes that L-PGDS retards cell cycle progression and migration in wild-type VSMCs, precluding hyperplasia of the tunica media.

Statistics:

• 2.5-fold increase in apoptosis in type 2 diabetic VSMCs.
• 10-fold increase in L-PGDS uptake in type 2 diabetic VSMCs.
• 5-point increase in cyclin-dependent kinase-2 protein expression in wild-type VSMCs treated with L-PGDS.

Sources:

• Ragolia, Louis, et al. "Inhibition of cell cycle progression and migration of vascular smooth muscle cells by prostaglandin D2 synthase: resistance in diabetic Goto-Kakizaki rats." Amer J Physiol-Cell Physiol, vol. 287, no. 5, 2004, pp. C1273-C1281.
• American Physiological Society, publisher.
• Obesity & Diabetes Week, editor.