Changes in the Rhythmoinotropic Dependence of the Myocardium in Rats with Postinfarction Cardiosclerosis after β1-Adrenoreceptor Blocking

Comparative study of changes in energy metabolism in rat cardiomyocytes in postinfarction cardiosclerosis and diabetes mellitus

Cardiomyocyte energy metabolism in experimental unfolding postinfarction cardiosclerosis and diabetes mellitus was studied. Postinfarction cardiosclerosis formed 6 weeks after coronary artery occlusion. Diabetes mellitus was induced by intraperitoneal injection of streptozotocin (60 mg/kg). The rate of oxygen consumption in postinfarction cardiosclerosis and diabetes increased by 3.4 and 4.2 times, respectively. Stimulation of mitochondrial respiration (ATP, palmitic acid) significantly increased oxygen consumption in animals with postinfarction cardiosclerosis and significantly reduced this process in diabetes. The content of LDH and SDH in the myocardium of animals with diabetes and postinfarction cardiosclerosis was significantly below the control. Hence, the development of postinfarction cardiosclerosis and diabetes mellitus were characterized by reduced generation of ATP in anaerobic and aerobic pathways and oxidative phosphorylation in cardiomyocytes.