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Peritubular Cells in the Testis of the Common Carp (Cyprinus Carpio L.) ; Ultrastructure and Characterisation With Actin and Desmin (Immuno) Cytochemistry

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

With electron microscopy, the presence of peritubular cells has been demonstrated in the interstitial tissue of carp testis. They are long flattened cells, often occupying nearly the whole space between neighbouring tubules. Their ultrastructural characteristics in mature carp, i.e. microfilaments and dense bodies, indicate myoid properties, probably related to sperm transport, similar to peritubular cells in mammals and to myoid boundary cells in pikes. The presence of actin, revealed in peritubular cells of mature carp testis, confirms the ultrastructural demonstration of microfilaments. Moreover, the peritubular cells are characterized by desmin, as shown in a double (immuno)fluorescence reaction for actin and desmin. The location of desmin in the peritubular cells is similar to that in mice and other mammals. However, in testes of carp at the age of seven months, showing active spermatogenesis, only faint desmin positivity was observed. Moreover, contrary to mice and other mammals, activity of alkaline phosphatase seems not to be present in peritubular cells of spermatogenic or mature carp, but only in the walls of blood vessels and capillaries. The possible function of peritubular cells during active spermatogenesis is discussed.

Affiliations: 1: Department of Experimental Animal Morphology and Cell Biology, Agricultural University, Postbox 338, 6700 AH Wageningen, The Netherlands


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