CELL-CELL INTERACTIONS IN THE CONTROL OF SPERMATOGENESIS AS STUDIED USING LEYDIG-CELL DESTRUCTION AND TESTOSTERONE REPLACEMENT

被引:163
|
作者
SHARPE, RM [1 ]
MADDOCKS, S [1 ]
KERR, JB [1 ]
机构
[1] MONASH UNIV, DEPT ANAT, CLAYTON, VIC 3168, AUSTRALIA
来源
AMERICAN JOURNAL OF ANATOMY | 1990年 / 188卷 / 01期
关键词
D O I
10.1002/aja.1001880103
中图分类号
R602 [外科病理学、解剖学]; R32 [人体形态学];
学科分类号
100101 ;
摘要
This review centers around studies which have used ethane dimethane sulphonate (EDS) selectively to destroy all of the Leydig cells in the adult rat testis. With additional manipulations such as testosterone replacement and/or experimental induction of severe seminiferous tubule damage in EDS‐injected rats, the following questions have been addressed: (1) What are the roles and relative importance of testosterone and other non‐androgenic Leydig cell products in normal spermatogenesis and testicular function in general? (2) What are the factors controlling Leydig cell proliferation and maturation? (3) Is it the Leydig cells or the seminiferous tubules (or both) which control the testicular vasculature? The findings emphasize that in the normal adult rat testis there is a complex interaction between the Leydig cells, the Sertoli (and/or peritubular) cells, the germ cells, and the vasculature, and that testosterone, but not other Leydig cell products, plays a central role in many of these interactions. The Leydig cells drive spermatogenesis via the secretion of testosterone which acts on the Sertoli and/or peritubular cells to create an environment which enables normal progression of germ cells through stage VII of the spermatogenic cycle. In addition, testosterone is involved in the control of the vasculature, and hence the formation of testicular interstitial fluid, presumably again via effects on the Sertoli and/or peritubular cells. When Leydig cells regenerate and mature after their destruction by EDS, it can be shown that both the rate and the location of regenerating Leydig cells is determined by an interplay between endocrine (LH and perhaps FSH) and paracrine factors; the latter emanate from the seminiferous tubules and are determined by the germ cell complement. Taken together with other data on the paracrine control of Leydig cell testosterone secretion by the seminiferous tubules, these findings demonstrate that the functions of all of the cell types in the testis are interwoven in a highly organized manner. This has considerable implications with regard to the concentration of research effort on in vitro studies of the testis, and is discussed together with the need for a multidisciplinary approach if the complex control of spermatogenesis is ever to be properly understood. Copyright © 1990 Wiley‐Liss, Inc.
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页码:3 / 20
页数:18
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