Analyse autoradiographique du renouvellement cellulaire dans le tube digestif et les autres compartiments somatiques de l'holothurie apode Leptosynapta galliennei = Autoradiographic analysis of cell renewal in the digestive tract, and in other somatic parts of the holothuria Leptosynapta galliennei
Féral, J.P. (1989). Analyse autoradiographique du renouvellement cellulaire dans le tube digestif et les autres compartiments somatiques de l'holothurie apode Leptosynapta galliennei = Autoradiographic analysis of cell renewal in the digestive tract, and in other somatic parts of the holothuria Leptosynapta galliennei. Cah. Biol. Mar. 30(2): 131-141
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094, meer
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| Abstract |
The DNA-synthesizing cells of Leptosynapta galliennei were labelled with tritiated thymidine and detected with autoradiography on plastic semi-thin sections and on paraffine sections. Most of the digestive epithelia consist of expanding cell populations, including in the intestine where the label index is 5%. In the stomach, mitosis in the digestive epithelium are very rare. Zymogen and caliciform mucus cells do not divide (static populations?). Coelomocytes are dividing in all the tissues they are infiltrating, as well in the hemal and coelomic fluids. Hemal vessels could be considered as cytopoietic organs for coelomocytes. The labelling of the external epithelium of the tegument after intracoelomic injection of thymidine demonstrates the coelomic fluid role in the transport of small molecular weight molecules and that the tegument is not trophically isolated from the rest of the organism as postulated before. |
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