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From the Department of Pediatrics, Hamamatsu University School of
Medicine, Hamamatsu, Japan.
Correspondence to Yan-Jun Liu, Department of Pediatrics, Hamamatsu University School of Medicine, 3600 Handa-Cho, Hamamatsu 43131, Japan.
AbstractThe presence of
11ß-hydroxysteroid dehydrogenase (11ß-HSD) activity in the kidney
has been suggested to be important in the regulation of
glucocorticoid-induced disorders of electrolyte balance and the control
of blood pressure. To assess the possible effect of 11ß-HSD isoforms
in diabetes-related hypertension, we measured the mean systolic
blood pressure and the 11ß-HSD activity and mRNA levels for both
11ß-HSD1 and 11ß-HSD2 in the kidney of streptozotocin
(STZ)-diabetic female rats. Three weeks after injection of STZ (65
mg/kg), the mean systolic blood pressure of diabetic rats was
elevated 13.6% above that of normal rats (P<.01). The
renal 11ß-HSD2 activity and level of mRNA expression were
significantly decreased in diabetic rats (P<.01).
However, the treatment of rats with STZ did not decrease the levels of
renal 11ß-HSD1 activity and mRNA expression in diabetic rats. Insulin
administered subcutaneously to diabetic rats for 2 weeks completely
reversed the decrease in renal 11ß-HSD2 activity and gene expression
and prevented the elevation in blood pressure in the diabetic rat.
These results indicate that alteration of renal 11ß-HSD2 activity and
gene expression may be primarily responsible for the changes in blood
pressure of STZ-diabetic rats after early treatment with insulin.
© 1998 American Heart Association, Inc.
Scientific Contributions
Gene Expression of 11ß-Hydroxysteroid Dehydrogenase Type 1 and Type 2 in the Kidneys of Insulin-Dependent Diabetic Rats
Key Words: 11ß-hydroxysteroid dehydrogenase streptozotocin diabetes mellitus kidney blood pressure insulin
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