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Identification of a potent Xenopus mesoderm-inducing factor as a homologue of activin A

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Abstract

THE first inductive interaction in amphibian development is mesoderm induction, when a signal from the vegetal hemisphere of the blastula induces mesoderm from overlying equatorial cells1,2. Recently, several 'mesoderm-inducing factors' (MIFs) have been discovered. These cause isolated Xenopus animal caps to form mesodermal cell types such as muscle, instead of their normal fate of epidermis. The MIFs fall into two classes. One comprises members of the fibroblast growth factor (FGF) family3–5, and the other members of the transforming growth factor type β (TGF-β) family6–7. Of the latter group, the most potent is XTC-MIF, a protein produced by Xenopus XTC cells8–10. Here we show that XTC-MIF is the homologue of mammalian activin A. Activins modulate the release of follicle-stimulating hormone from cultured anterior pituitary cells11,12 and cause the differentiation of two erythroleukaemia cell lines13,14. Our results indicate that these molecules may also act in early development during formation of the mesoderm.

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Authors and Affiliations

  1. Laboratory of Embryogenesis, National Institute for Medical Research, The Ridgeway, Mill Hill, London, NW7 1AA, UK

    J. C. Smith & B. M. J. Price

  2. Innogenetics, Industriepark Zwijnaarde 7, Box 4, B-9710, Ghent, Belgium

    K. Van Nimmen & D. Huylebroeck

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  1. J. C. Smith
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  2. B. M. J. Price
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  3. K. Van Nimmen
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  4. D. Huylebroeck
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Smith, J., Price, B., Nimmen, K. et al. Identification of a potent Xenopus mesoderm-inducing factor as a homologue of activin A. Nature 345, 729–731 (1990). https://doi.org/10.1038/345729a0

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