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  • Title: Activin-like factor from a Xenopus laevis cell line responsible for mesoderm induction.
    Author: van den Eijnden-Van Raaij AJ, van Zoelent EJ, van Nimmen K, Koster CH, Snoek GT, Durston AJ, Huylebroeck D.
    Journal: Nature; 1990 Jun 21; 345(6277):732-4. PubMed ID: 2113616.
    Abstract:
    Induction of mesoderm during early amphibian embryogenesis can be mimicked in vitro by adding growth factors, including heparin-binding and type-beta transforming growth factors (TGF-beta), to isolated ectoderm explants from Xenopus laevis embryos. Although the mesoderm-inducing factor (MIF) from X. laevis XTC cells (XTC-MIF) has properties similar to TGF-beta, this factor is still unidentified. Recently, we obtained a number of homogeneous cell lines from the heterogeneous XTC population, which differ in their MIF production. Only one, XTC-GTX-11, produced MIF, although it was similar to the rest of the clones in its production of known growth factors, including TGF-beta activity. This observation, together with the identification of activin A as a potent MIF led us to study the parallel activities of MIF and activin. Here we report an analysis of activin-like activity from XTC cells and some of the XTC clones, including XTC-GTX-11. There is a clear consistent correlation between MIF activity and presence of activin activity, indicating that XTC-MIF is the Xenopus homologue of mammalian activin.
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