Gestational diabetes affects platelet behaviour through modified oxidative radical metabolism

Area of Science:

• Biochemistry
• Physiology
• Obstetrics

Background:

• Type 1 and Type 2 diabetes mellitus are associated with altered platelet function, including reduced nitric oxide synthase (NOS) activity and increased peroxynitrite production.
• Gestational diabetes mellitus (GDM) offers a model to study short-term effects of impaired glucose metabolism on platelet function, independent of long-term diabetic complications.

Purpose of the Study:

• To investigate nitric oxide (NO) metabolism in platelets from pregnant women with GDM.
• To assess peroxide production, a key factor in peroxynitrite formation, in GDM platelets.

Main Methods:

• Platelet NOS activity and peroxynitrite production were measured.
• Levels of hydroperoxides and thiobarbituric acid reactive substances (TBARS) in platelet membranes were determined.
• Measurements were performed in basal conditions and after in vitro peroxidative stress in women with GDM, healthy pregnant women, and non-pregnant controls.

Main Results:

• NOS activity was elevated in both pregnant groups compared to non-pregnant controls, with higher activity in GDM women.
• Peroxynitrite production was increased in GDM women compared to pregnant controls, and reduced in pregnant controls versus non-pregnant women.
• Basal levels of platelet membrane peroxidation (hydroperoxides, TBARS) and susceptibility to peroxidation were higher in GDM patients than in both control groups.

Conclusions:

• GDM is associated with significant alterations in platelet nitric oxide (NO) and peroxynitrite production.
• Platelets from GDM women exhibit increased indicators of oxidative stress.
• These modifications in platelet NO metabolism and oxidative stress may contribute to cellular dysfunction in GDM.