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Cell and Tissue Research

, Volume 270, Issue 3, pp 451–457 | Cite as

Extra-Golgi pathway of an acrosomal antigen during spermiogenesis in the rat

  • I. Tanii
  • K. Toshimori
  • S. Araki
  • C. Oura
Article

Summary

A monoclonal antibody (MC41) was produced that specifically recognizes a sperm acrosomal antigen of approximately 165000 dalton in the rat. Rat testis was examined using a pre-embedding immunoperoxidase technique to reveal the pathway of the MC41 antigen to the acrosome during spermiogenesis. The MC41 immunoreaction appeared in several organelles of spermatids in a stage-specific manner: (1) in the endoplasmic reticulum (ER) throughout spermiogenesis, (2) in the outer acrosomal membrane from steps 9 to 19, (3) as a weak immunoreaction in the vesicular structures in the acrosomal matrix from steps 11 to 17, and (4) as a strong immunoreaction in the acrosomal matrix especially at the terminal step of spermiogenesis (step 19). However, no immunoreaction was observed in the Golgi region throughout spermiogenesis. These results suggest that the pathway of the MC41 antigen leads firstly from the ER to the outer acrosomal membrane and secondly to the acrosomal matrix. This pathway does not involve the Golgi apparatus and is referred to as the “extra-Golgi pathway”.

Key words

Intra-acrosomal protein Acrosome development Extra-Golgi pathway Spermiogenesis Immunoelectron microscopy Rat (Wistar) 

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • I. Tanii
    • 1
  • K. Toshimori
    • 1
  • S. Araki
    • 1
  • C. Oura
    • 1
  1. 1.Department of AnatomyMiyazaki Medical CollegeMiyazakiJapan

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