Epidermal glucoss content and hexokinase activities of diabetic patients with xerosis

Kim, Dong Kun; Lee, Eun so; Im, Jae Chael

Abstract

It is well estabilshed that the xerosis is closely related to diabeic pruritus. Although the causes of xerosis are thought to bie the abnormalities of sweating and autonomic nervous system, the exact mechanism of the xerosis in diabetic skin is still unknown. This study was designed to investigate the possible derangement of glucose metabolism in the skin of diabetes mellitus patients with xerosis. The epidemal glucose content and hexokonase activities were masured in the skin samples obtained from normal individuals and diabetes mellitus patients with xerosis The epidermal glucose content was measured by the enzymatic cycling method. The enzymatic activities of hexokinase were assayed by fluorometric method. The epidermal glucose content of diabetic patients increaed approximately twice [27.46+9.52 (mmole/kg /dry weight) that of normal individuals [13.90+4.79(mmole/kg /dry weight)] (p<0. 0001). The epidermal hexokinase activities of diabetes patients were significantly decreased [0.56+0.15(mole/hr/kg/dry weight)] compared to that of normal indivduals [0.96+0.24(mole/hr/kg dry weight)] (p<0.0001). There were no significant differences in the epidermal glucose content and enzyme activities of hexokinase between the diabetic patients with: erosis and diabetic patients without xerosis. These data indicated that decreased activities of hexokinase could reduce the glucose phopkiorylation and uptake into keratinocytes, and which could lead to accumulat. glucose in the interstitial space of diabetic epidermis. And the decreased hexokinase activities may exert on lipid metabolism and glycolysis of diabetic epiidermis, because hexokinase is a key enzyme of hexose monophosphate pathway and glycolysis.