Alteration of oxide reductive and haemostatic factors in type 2 diabetics

Abstract

To assess any pathogenic role of radical activity and haemostatic alteration in the early cardiovascular disease of microalbuminuric type 2 diabetics (non-insulin dependent). A selected cohort of type 2 diabetics was identified, divided according to urinary albumin excretion and compared with a healthy control group depending on some haemostatic factors and radical activity. All the subjects were studied as outpatients. Eighty diabetics and 84 healthy controls were interviewed and underwent blood tests to exclude standard cardiovascular risk factors before follow up. The subjects were males, age range 43-55 years, and divided according to albumin excretion (microalbuminuria > 30-200 mg L-1; normoalbuminuria < 15 mg L-1). The mean duration of diabetes referred by the patients was 9.3 years in albuminuric and 11.1 years in normoalbuminuric patients with a good control of plasma glucose level. Neither the diabetics nor the control group showed clinical evidence of renal and cardiovascular diseases. Microalbuminuric patients presented elevated malondialdehyde concentration, glutathione peroxidase activity, phospholipidic fatty acid levels, fibrinogen, plasminogen activator inhibitor, tissue plasminogen activator and von Willebrand factor compared with normoalbuminuric patients and controls. More collagen was required in microalbuminuric diabetics than in normoalbuminurics and controls. Our results confirm that both free radical activity and changes in haemostatic factors can be observed in type 2 diabetes and particularly in patients with albuminuria. Our very selected series with short duration, good control of diabetes and lack of clinical evidence of cardiovascular disease may suggest that these abnormalities develop earlier and may be associated with, and/or implicated in, the pathogenesis of microvascular complications which can be related to a higher and early cardiovascular morbidity and mortality rate in microalbuminuric diabetics.