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Development, Vol 113, Issue 4 1451-1457, Copyright © 1991 by Company of Biologists
JOURNAL ARTICLES |
I Godin and CC Wylie
Wellcome/CRC Institute, Cambridge, UK.
Primordial germ cells are the stem cells that provide the functional gametes of adult animals. In many animal groups they are set aside at the earliest stages of development, and migrate from their sites of first appearance to the sites where the gonad will form, the genital ridges. During this migration they proliferate. In the mouse embryo their numbers increase from less than one hundred to approximately four thousand during the period of their migration. In a previous paper we showed that both the proliferation and the direction of migration of mouse PGCs in culture were influenced by soluble factors released from their target tissue, the genital ridges. Studies on other stem cell populations have shown that complex combinations of growth factors control their proliferation, migration and differentiation. In this paper, we show that TGF beta 1 inhibits proliferation of PGCs taken from 8.5 day old embryos and cultured on embryonic fibroblast feeder layers. We also show that the previously reported chemotropic effect of genital ridges in this culture system is mediated by TGF beta 1, or a closely related molecule, released from the genital ridges.
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