The effects of telmisartan on mechanical responses of left ventricular papillary muscle in rats with streptozotocin-induced diabetes mellitus.
The purpose of this study was to investigate the effects of telmisartan (5 × 10(-5) M) on the mechanical response of left ventricular papillary muscle in rats with streptozotocin-induced diabetes mellitus. We studied 32 rats; 16 were rendered diabetic by a single intravenous injection of streptozotocin (45 mg kg(-1) i.v.) and 16 formed a non-diabetic control group. Diabetic animals were divided into two groups: diabetic-telmisartan group and the diabetic-control group. Non-diabetic controls were further divided into the non-diabetic-telmisartan group and the non-diabetic-control group. We found: (1) Muscle twitch tension (P (0)) and contraction and relaxation rates were significantly lower in diabetic controls than in the other groups. (2) Telmisartan significantly increased P (0) in both diabetic and non-diabetic rats. (3) Times to peak tension and half-relaxation were significantly greater in groups DC and DT than in the non-diabetics. In conclusion, our data suggest that telmisartan attenuates diabetes-induced impairment of diabetic rat papillary muscles, and may thus be able to reduce cardiac complications in diabetes.
Emre
Mustafa
M
Department of Biophysics, School of Medicine, Cukurova University, 01330 Adana, Turkey. memre@cu.edu.tr
Kavak
Servet
S
Unlugenc
Hakki
H
D047228:Angiotensin II Type 1 Receptor Blockers / Q000008:administration & dosage*; D000818:Animals; D001562:Benzimidazoles / Q000008:administration & dosage*; D001565:Benzoates / Q000008:administration & dosage*; D003921:Diabetes Mellitus, Experimental / Q000150:complications* / Q000188:drug therapy / Q000503:physiopathology; D058065:Diabetic Cardiomyopathies / Q000188:drug therapy* / Q000503:physiopathology*; D004195:Disease Models, Animal; D006352:Heart Ventricles / Q000187:drug effects* / Q000503:physiopathology; D006801:Humans; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects; D010210:Papillary Muscles / Q000187:drug effects* / Q000503:physiopathology; D051381:Rats; D017208:Rats, Wistar; D013311:Streptozocin; D000077333:Telmisartan
D047228:Angiotensin II Type 1 Receptor Blockers; D001562:Benzimidazoles; D001565:Benzoates; D013311:Streptozocin; D000077333:Telmisartan