Indirect Evidence of Impairment of Platelet Desaturase Enzymes in Diabetes Mellitus

Summary

We measured the platelet total phospholipid fatty acid profiles of 20 insulin treated (Type I) diabetics, 20 non-insulin treated (Type II) diabetics and 20 matched non-diabetic controls to determine the relationship between the ω6 and ω3 series of fatty acids in diabetes.

A significant inverse correlation between linoleic acid and arachidonic acid occurred in the normal subjects (r = -0.61; P < 0.001) but was not seen in the Type I diabetics (r = -0.13; P = NS) or in the Type II diabetics (r = -0.27; P = NS).

No significant correlation was seen between linolenic acid and eicosapentaenoic acid in the normal controls (r = -0.34; P = NS) or in the Type I diabetics (r = 0.21; P = NS) or in the Type II diabetics (r = -0.20; P = NS).

The results suggest that a functional impairment of platelet delta 5 and delta 6 desaturase may occur in diabetes which disrupts the normal equilibrium between linoleic acid and arachidonic acid. However, the level of eicosapentaenoic acid appears to be less dependent on conversion from linolenic acid. Our findings are of importance to studies designed to reduce platelet aggregation in diabetics and non-diabetics by manipulation of the levels of the precursor fatty acids of thromboxane.

Key-Words

Platelet - Fatty Acid - Diabetes Mellitus - Thromboxane