Beneficial effects of clonidine in streptozotocin-induced diabetes and DOCA-hypertensive rats.
This investigation was undertaken to study the effects of chronic treatment with clonidine on cardiovascular complications in streptozotocin-induced diabetes and DOCA-hypertensive rats. Injection of streptozotocin induced glucosuria, hyperglycaemia, hypoinsulinaemia, hypothyroidism, hypercholesterolaemia, hypertriglyceridaemia, bradycardia and a decrease in left ventricular developed pressure (LVDP). DOCA by itself did not induce any change in blood-glucose levels in non-diabetic animals. However, in diabetic animals DOCA significantly reduced blood-glucose levels. Treatment of diabetic and diabetic hypertensive animals with clonidine (25 micrograms kg-1 every day for six weeks) significantly prevented diabetes-induced loss of body weight, bradycardia, cardiac hypertrophy and hypothyroidism. It also partially, but significantly, prevented diabetes-induced hyperglycaemia and hypoinsulinaemia in both diabetic and diabetic-hypertensive animals. There was a significant reduction in diabetes-induced elevation of cholesterol and triglyceride levels and an improvement in LVDP at higher filling pressure in diabetic and diabetic hypertensive animals. This investigation shows that chronic treatment with clonidine produces a number of beneficial effects such as prevention of hyperlipidaemia and hypothyroidism and improvement in cardiomyopathy and glycaemic control in diabetic and diabetic hypertensive rats.
Satia
M C
MC
Department of Pharmacology, L. M. College of Pharmacy, Navarangpura Ahmedabad, India.
Damani
R R
RR
Goyal
R K
RK
D000316:Adrenergic alpha-Agonists / Q000627:therapeutic use*; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D006332:Cardiomegaly / Q000188:drug therapy / Q000503:physiopathology; D003000:Clonidine / Q000627:therapeutic use*; D003900:Desoxycorticosterone; D003921:Diabetes Mellitus, Experimental / Q000188:drug therapy* / Q000378:metabolism; D005260:Female; D006334:Heart Function Tests; D006339:Heart Rate / Q000187:drug effects; D006439:Hemodynamics / Q000187:drug effects; D006973:Hypertension / Q000139:chemically induced / Q000188:drug therapy* / Q000378:metabolism; D008055:Lipids / Q000097:blood; D051381:Rats; D017208:Rats, Wistar
D000316:Adrenergic alpha-Agonists; D008055:Lipids; D003900:Desoxycorticosterone; D003000:Clonidine