[Ultrastructure and morphology of the mitochondriome of cardiomyocytes from invertebrates. I. The mitochondriome of cardiomyocytes from insects].
The cardiomyocyte mitochondrial ultrastructure of two insect species (the American cockroach Periplaneta americana, and a dragonfly Aeschna sp.) has been studied. Mitochondria in cardiomyocytes of these insects are connected by intermitochondrial contacts, similar in morphology to vertebrate intermitochondrial contacts. The number of intermitochondrial contacts differs in cardiomyocytes of the studied insects, numbering 12 and 18 per 100 mitochondria in cardiomyocytes of the cockroach and dragonfly, respectively, which is due presumably to differences in activity of these insects. Cardiomyocytes of both species have several features in common. It was shown that cross-striated myofibrils oriented in different directions occupy 50-58% of the cytoplasmic volume, while mitochondria cover only 16-18%. The pattern of mitochondrial localization differs in cardiomyocytes of the two studied insects. In the cockroach, cardiomyocyte mitochondria are seen both in the center of the cell and on its periphery, in protrusions; whereas in the dragonfly, mitochondria of cardiomyocytes are confined to the protrusions of the abluminal cell side. Mitochondrial profiles are small, their packing is not dense. Mitochondria in cardiomyocytes of these insects have few plastic cristae and dense matrix.
Lipina
T V
TV
Department of Cytology and Histology, Biological Faculty, Moscow State University.
Shornikova
M V
MV
Chentsov
Iu S
IuS
D000818:Animals; D007425:Intracellular Membranes / Q000648:ultrastructure; D008854:Microscopy, Electron; D008929:Mitochondria, Heart / Q000648:ultrastructure*; D009206:Myocardium / Q000648:ultrastructure; D010526:Periplaneta / Q000648:ultrastructure*