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- W53573570 abstract "Data from several experimental approaches strongly suggest that Sertoli cells exert a paracrine control of the two main testicular functions, androgen secretion and spermatogenesis. Further evidence supporting this role of Sertoli cells was obtained by coculture of Sertoli cells with other testicular cells. Coculture of pig or rat Sertoli cells with pig Leydig cells produces an increase in the hCG receptor number and an increase in the steroidogenic activity of Leydig cells. Pretreatment with FSH further increases the values of these two parameters. These biochemical changes were associated with ultrastructural changes in Leydig cells. The effects of Sertoli cells on Leydig cells depend upon the ratio of the two cells and on the substrate in which the cells are cultured. Moreover, Leydig cells produce an increase in the FSH receptor number and in the FSH stimulation of plasminogen activator production by Sertoli cells. Coculture of rat or pig Sertoli cells with rat germ cells, induces an increase in the RNA and DNA biosynthetic activities of germ cells. Most of the stimulatory effects seemed to be mediated by diffusible factors, secreted by Sertoli cells, but full expression of the stimulatory action was observed when germ cells were in contact with other cells. In this coculture system, a fraction of rat germ cells containing mainly mature forms of spermatocytes inhibited rat Sertoli cell RNA and DNA synthesis, but had no effect on pig Sertoli cells. On the contrary, a fraction of rat germ cells richer in spermatogonias and preleptotene spermatocytes, stimulated rat Sertoli cell DNA synthesis but was without effect on pig Sertoli cells. These results clearly show that the stimulatory effects of Sertoli cells on Leydig and on germ cells which are not species specific are mediated mainly by diffusible factors, the secretion of which is regulates by FSH." @default.
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- W53573570 date "1986-01-01" @default.
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- W53573570 title "Paracrine role of Sertoli cells." @default.
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