The early haploid male gamete develops a capacity for fertilization after the coalescence of the proacrosomal granules (Journal article)

Sofikitis, N./ Yamamoto, Y./ Isoyama, T./ Miyagawa, I.

We compared the fertilizing capacity of rabbit testicular round spermatids (i) before appearance of the proacrosomal granules (stage -1), (ii) with two to three proacrosomal granules attached to the nucleus (stage -2) and (iii) with one granule attached to the nucleus (stages -3 to -5). Testicular samples were minced and observed via confocal scanning laser microscopy, which allows intracellular observation at high magnification and the subsequent identification of acrosomal granules and round spermatids. Nuclei of round spermatids of stage -1 (group A), -2 (group B), and -3 to -5 (group C) were isolated and injected into mature rabbit oocytes. At 24 and 72 h post-injection the number of cleaved oocytes and morulae/blastocysts, respectively, were significantly lower in groups A and B than group C. These results suggest that the rabbit round spermatid develops fertilizing potential after the stage at which the coalescence of the acrosomal granules occurs.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών Υγείας. Τμήμα Ιατρικής
Keywords: Acrosome/*ultrastructure,Animals,Blastocyst,Cell Separation,Cleavage Stage, Ovum,Cytoplasmic Granules/*ultrastructure,Embryonic and Fetal Development,Female,*Fertilization in Vitro,Male,Microinjections,Microscopy, Electron,Morula,Nuclear Transfer Techniques,Oocytes/ultrastructure,Rabbits,Spermatids/*physiology/*ultrastructure
ISSN: 0268-1161
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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