. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 108 M. G. MARTYNOVA AND O. A. BYSTROVA -•**•*«.£'•» • ^'<y*• a f£S"3; '•' ••JhGwr _ •^T*Sii ''•. Figure 6. Electron micrograph of a moderately differentiated cardiomyocyte in the Acluitinu myocardium, m, mature cardiomyocytes. e, endotheliul cells. Scale bar = 2 pun. Figure 7. Electron micrograph showing a desmosome (arrow) between moderately differentiated (mm) and mature (m) cardiomyocytes. Scale bar = 1 n111- heart do not demonstrate any morphological indications of transformation into myocytes, so they could not
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 108 M. G. MARTYNOVA AND O. A. BYSTROVA -•**•*«.£'•» • ^'<y*• a f£S"3; '•' ••JhGwr _ •^T*Sii ''•. Figure 6. Electron micrograph of a moderately differentiated cardiomyocyte in the Acluitinu myocardium, m, mature cardiomyocytes. e, endotheliul cells. Scale bar = 2 pun. Figure 7. Electron micrograph showing a desmosome (arrow) between moderately differentiated (mm) and mature (m) cardiomyocytes. Scale bar = 1 n111- heart do not demonstrate any morphological indications of transformation into myocytes, so they could not be serving as stem cells for muscle differentiation. The present study of the Achatina heart muscle provided no evidence about whether the examined UCs are remnants of the original, embryonic myoblasts or represent new cells of another origin, which invaded the heart only later in its development. Recent data on the participation of bone- marrow-derived cells in cardiac muscle regeneration in Duchenne dystrophic mice demonstrate that adult vertebrate myocardium has a source of myogenic stem cells located outside the organ (Bittner el ul., 1999). A population of undifferentiated cells was found also in the myocardia of bivalve and cephalopod molluscs (By- strova et ai. 1996). It may be assumed that the mosaic 100 % [3H] thymidine cpm cleared 50- 1015 30min 2h 24h time after [3H] thymidine injection Figure 8. Percent radioactivity in the hemolymph of the snail plotted against time after tritiated thymidine injection. Results are expressed as percent clearance of the first sample radioactivity (immediately after iso- tope injection). distribution of myogenic cells is a characteristic feature of the molluscan myocardium shared by representatives of different classes. This shared feature enables us to classify the molluscan heart muscle as a special muscle type con- sisting of discrete mononucleated diploid myocytes and, at the same time, possessing myogenic
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
