ニホンツキノワグマ(Selenarctos thibetanusjaponicus)における性成熟と精子形成にかかわる幹細胞

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タイトル別名
  • Puberty and Stem Cell for the Initiation and Resumption of Spermatogenesis in the Male Japanese Black Bear (<I>Selenarctos thibetanus japonicus</I>)
  • 雄ニホンツキノワグマ(Selenarctos thibetanus japonicus)における性成熟と精子形成にかかわる幹細胞
  • オス ニホンツキノワグマ Selenarctos thibetanus jap
  • Puberty and Stem Cell for the Initiation and Resumption of Spermatogenesis in the Male Japanese Black Bear (<italic>Selenarctos thibetanus japonicu</italic>s)
  • Puberty and stem cells for the initiation and resumption of spermatogenesis in the male Japanese black bear (Selenarctos thibetanus japonicus)
  • Puberty and stem cell for the initiation and resumption of spermatogenesis in the male Japanese black bear (Selenarctos thibetanus japonicus)

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Testes of Japanese black bears (Selenarctos thibetanus japonicus) were collected from 27 bears shot by hunters and biopsied from 13 bears captured by traps. The size and weight of the testis, and the diameter of seminiferous tubules increased in 2 or 3 year-old bears. The percentage of sexually matured bears in each age group was 0% (1 year-old), 50% (2 year-old) and 100% (over 3 year-old), respectively. Therefore, puberty was assumed to be at 2 or 3 year of age. Only Sertoli and large round cells were the cell population in the seminiferous epithelium of prepuberal testis. The morphological characteristics of the large round cells were identified with that of gonocyte as reported in other species and were judged to be the stem cells in the testis of the prepuberal bear. The large cells resembling gonocyte were present in the seminiferous tubules of the puberal testis. In the present study, these cells were referred to as gonocyte-like cell. These cells increased in number during the non-breeding season. The gonocyte-like cells were morphologically similar to those of undifferentiated type A-spermatogonia. Therefore, these cells may be equivalent to undifferentiated type A-spermatogonia, that is, the stem cells in the testis of the puberal bear for resumption of spermatogenesis.

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