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  E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/115483983 Title: The annual testicular cycle in the turtle, Chrysemys picta: a histochemical and electron microscopic study. Publisher: ISBN/ISSN: 0016-6480 OCLC:115483983

  
  

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The annual testicular cycle in the turtle, Chrysemys picta: a histochemical and electron microscopic study.

Author:	W Dubois; J Pudney; IP Callard
Edition/Format:	Article : English
Publication:	General and comparative endocrinology, 1988 Aug; 71(2): 191-204
Database:	From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
Summary:	This work is a study of testicular function in Chrysemys picta using changes in ultrastructure and steroid histochemistry as indices of Leydig and Sertoli cell activity. The cytological features of these cells are described in reference to four periods of tubular development. Leydig and Sertoli cells show distinct changes in morphological appearance during the seasonal cycle. Leydig cells are hypertrophic with an active 3 beta-hydroxysteroid dehydrogenase (HSD) and abundant smooth endoplasmic reticulum (SER) in early spring when androgen levels are high and animals mate and atropic in mid-summer when spermatogenesis is proceeding. Leydig cell atrophy is associated with a reduction in the volume of cytoplasm and SER. Leydig cells become active again in the fall showing a return toward the spring condition, with an increase in 3 beta-HSD activity. In contrast, although Sertoli cells show variations in abundance of organelles and inclusions during the annual cycle, no obvious degenerative changes could be seen and SER is always present. 3 beta-HSD enzyme activity in Sertoli cells is weak or absent in spring but intense during summer. Taken together, these observations suggest that Sertoli and Leydig cell functions are asynchronous.  Read more...
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