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It is apparent that the uterus is a rich source of growth factors, the synthesis of which may be induced by female sex steroids. These growth factors appear to be involved in complex autocrine/paracrine regulatory circuits which in turn interact with steroid hormones. With the exception of CSF-1, however, detailed studies of the appearance of these growth factors and their receptors during pregnancy and under different hormonal regimens have yet to be performed. Furthermore, causative roles have not been established for any of these growth factors in uterine biology and pregnancy. In the near future we can expect that, by using in-situ techniques, the producing and responding cells will be identified. Cell culture models will also have to be established to investigate specific growth factor-induced functions. In the longer term, once more is known about the regulation of uterine growth factors, imaginative new experiments need to be designed, perhaps involving transgenic animals, to establish causative roles for growth factors in uterine biology.

Regulation of polypeptide growth factor synthesis and growth factor-related gene expression in the rat and mouse uterus before and after implantation