[Ultrastructural organization of cardiomyocyte sarcolemma in hibernating animals].
It was shown by electron microscopy that a highly convoluted sarcolemma, its numerous invaginations, well developed T-system contacting mainly with myofibrillar mitochondria and Z-zones were characteristic of cardiomyocytes of hibernants. In these cells lipid inclusions amounted as much as 3-4% of the cytoplasm. Cardiomyocytes of the arousing ground squirrels often revealed a complex of structures in the perinuclear area, responsible for protein synthesis and vesicle formation. Along with it the number of vesicles, including delineated ones, the majority of whom are contacting the sarcolemma, were manifested in the cell near-membrane area. A possible mechanism of cardiomyocyte plasma membrane rearrangements in ground squirrels and of alteration of their properties at the arousal, through a gradual replacement of plasma membrane material for the cytoplasmic vesicle bilayer, is discussed.
D000818:Animals; D006605:Hibernation; D008854:Microscopy, Electron; D009206:Myocardium / Q000648:ultrastructure*; D012508:Sarcolemma / Q000648:ultrastructure*; D012589:Sciuridae / Q000033:anatomy & histology* / Q000502:physiology
Osobennosti ul'trastrukturnoĭ organizatsii sarkolemmy kardiomiotsitov zimospiashchikh zhivotnykh.