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TELOCYTES IN ENDOCARDIUM: Electron Microscope Evidence #MMPMID20716125
Gherghiceanu M; Manole C; Popescu L
J Cell Mol Med 2010[Sep]; 14 (9): 2330-4 PMID20716125show ga
The term TELOCYTES was very recently introduced, for replacing the name Interstitial Cajal-Like Cells (ICLC). In fact, telocytes are not really Cajal-like cells, they being different from all other interstitial cells by the presence of telopodes, which are cell-body prolongations, very thin (under the resolving power of light microscopy), extremely long (tens up to hundreds of micrometers), with a moniliform aspect (many dilations along), and having caveolae. The presence of telocytes in epicardium and myocardium was previously documented. We present here electron microscope images showing the existence of telocytes, with telopodes, at the level of mouse endocardium. Telocytes are located in the subendothelial layer of endocardium, and their telopodes are interposed in between the endocardial endothelium and the cardiomyocytes bundles. Some telopodes penetrate from the endocardium among the cardiomyocytes and surround them, eventually. Telopodes frequently establish close spatial relationships with myocardial blood capillaries and nerve endings. Because we may consider endocardium as a ?blood?heart barrier?, or more exactly as a ?blood?myocardium barrier?, telocytes might have an important role in such a barrier being the dominant cell population in subendothelial layer of endocardium.
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J+Cell+Mol+Med 2010 ; 14 (9): 2330-4
