Seasonal patterns of ornithine decarboxylase activity and levels of polyamines in relation to the cytology of germinal cells during spermatogenesis in the sea star, Asterias vulgaris.

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	Seasonal patterns of ornithine decarboxylase activity and levels of polyamines in relation to the cytology of germinal cells during spermatogenesis in the sea star, Asterias vulgaris.
	WATTS, SA (WATTS, SA); HINES, G (HINES, G); LEE, K (LEE, K); JAFFURS, D (JAFFURS, D); ROY, J (ROY, J); SMITH, FF (SMITH, FF); WALKER, CW (WALKER, CW); WATTS, SA (通讯作者),UNIV NEW HAMPSHIRE,DEPT ZOOL,DURHAM,NH 03824, USA.
学科主题	Anatomy & Morphology ; Cell Biology
ISSN号	0040-8166
	1990
卷	22 期:4 页:435–447
收录类别	CSCD
产权排序	UNIV NEW HAMPSHIRE,DEPT ZOOL,DURHAM
英文摘要	The activity of ornithine decarboxylase (ODC) and levels of polyamines were measured in the testes ofAsterias vulgaris collected throughout an annual spermatogenic cycle. Samples of the testes were prepared for light and electron microscopy to observe the associated changes in the cytology of germinal cells. The specific activity of ODC increased at the onset of testicular growth, decreased during the coldest period of the winter when testicular growth was minimal, and increased again early in the spring when testes grew maximally. Increased activity of ODC resulted in increased levels of polyamines and was correlated with either mitotic or meiotic germinal cell divisions, or both. Spermine levels were always greater than putrescine, followed by spermidine. Highest levels of polyamine synthesis coincided with the onset of spermatogonial proliferation during the fall and with the period of meiotic differentiation and spermiogenesis in the spring. Mid-summer (July) testes were small (0.3–0.5 gonad index (GI)) and contained amitotic spermatogonia arrested in G₁ of the cell cycle. Mitotic and pre-meiotic testes (October/November) increased slightly in size (0.3–1.4 GI) and contained actively dividing spermatogonia, most of which differentiated into primary spermatocytes. Testes from February and March were large (1–6.75 GI), but the proliferative status of their spermatogonia and primary spermatocytes varied. Spermatogonia and primary spermatocytes from early February testes were not dividing. In testes obtained in March, both spermatogonial mitosis and meiosis of spermatocytes resumed, coincident with increased field water temperatures.
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文献类型	共享期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/7073
专题	科研共享资源
通讯作者	WATTS, SA (通讯作者),UNIV NEW HAMPSHIRE,DEPT ZOOL,DURHAM,NH 03824, USA.
推荐引用方式 GB/T 7714	WATTS, SA ,HINES, G ,LEE, K ,et al. Seasonal patterns of ornithine decarboxylase activity and levels of polyamines in relation to the cytology of germinal cells during spermatogenesis in the sea star, Asterias vulgaris.. 1990.

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