Gene expression of 11beta-hydroxysteroid dehydrogenase type 1 and type 2 in the kidneys of insulin-dependent diabetic rats.
The presence of 11beta-hydroxysteroid dehydrogenase (11beta-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 11beta-HSD isoforms in diabetes-related hypertension, we measured the mean systolic blood pressure and the 11beta-HSD activity and mRNA levels for both 11beta-HSD1 and 11beta-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 11beta-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 11beta-HSD1 activity and mRNA expression in diabetic rats. Insulin administered subcutaneously to diabetic rats for 2 weeks completely reversed the decrease in renal 11beta-HSD2 activity and gene expression and prevented the elevation in blood pressure in the diabetic rat. These results indicate that alteration of renal 11beta-HSD2 activity and gene expression may be primarily responsible for the changes in blood pressure of STZ-diabetic rats after early treatment with insulin.
Liu
Y J
YJ
Department of Pediatrics, Hamamatsu University School of Medicine, Japan.
Nakagawa
Y
Y
Ohzeki
T
T
D042842:11-beta-Hydroxysteroid Dehydrogenases; D000818:Animals; D001786:Blood Glucose / Q000187:drug effects; D001794:Blood Pressure / Q000187:drug effects; D015152:Blotting, Northern; D003922:Diabetes Mellitus, Type 1 / Q000139:chemically induced / Q000150:complications / Q000201:enzymology* / Q000503:physiopathology; D005260:Female; D015870:Gene Expression; D006913:Hydroxysteroid Dehydrogenases / Q000235:genetics*; D006973:Hypertension / Q000150:complications; D007328:Insulin / Q000378:metabolism / Q000494:pharmacology; D007668:Kidney / Q000201:enzymology* / Q000502:physiology; D012333:RNA, Messenger / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013311:Streptozocin
D001786:Blood Glucose; D007328:Insulin; D012333:RNA, Messenger; D013311:Streptozocin; D006913:Hydroxysteroid Dehydrogenases; D042842:11-beta-Hydroxysteroid Dehydrogenases