Differential localization of annexins in ram germ cells: a biochemical and immunocytochemical study. - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Journal of Histochemistry and Cytochemistry Année : 1991

Differential localization of annexins in ram germ cells: a biochemical and immunocytochemical study.

J. M. Feinberg
  • Fonction : Auteur
M. A. Kaetzel
  • Fonction : Auteur
J. L. Dacheux
  • Fonction : Auteur
J. R. Dedman
  • Fonction : Auteur
S. J. Weinman
  • Fonction : Auteur

Résumé

We used antibodies that specifically bind annexins on Western blots to determine the distribution and abundance of these proteins in ram spermatids and sperm by immunogold electron microscopy. Annexins I and II were found essentially within the entire acrosome of spermatids. During epididymal maturation, they concentrated in the postacrosomal region or the acrosomal equatorial segment, respectively. They were also present in sperm flagellum, on the surface of the coarse fibers and fibrous sheath. These findings show that during ram germ cell maturation, annexins I and II are exported from the spermatid acrosome towards structurally and functionally defined parts of the sperm. Annexins III, IV, and V were not found in ram germ cells. Annexin VI was isolated from testis and sperm. In spermatids, it was found to be associated with endoplasmic reticulum and the mitochondria but was absent from the acrosome. In sperm, it was confined to the flagellum, the mitochondria, and on the coarse fibers and fibrous sheath. The presence of three annexins, in addition to calmodulin, in functional areas may indicate differential ways for sperm to control and regulate events that are known to be calcium dependent, such as flagellar motility, acrosome reaction, and fertilization.

Domaines

Chimie organique
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Dates et versions

hal-00815048 , version 1 (18-04-2013)

Identifiants

  • HAL Id : hal-00815048 , version 1
  • PUBMED : 1830893

Citer

J. M. Feinberg, D. P. Rainteau, M. A. Kaetzel, J. L. Dacheux, J. R. Dedman, et al.. Differential localization of annexins in ram germ cells: a biochemical and immunocytochemical study.. Journal of Histochemistry and Cytochemistry, 1991, 39 ((7)), pp.955-63. ⟨hal-00815048⟩
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