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-β), to isolated ectoderm expiants from Xenopus laevis embryos1–5. Although the mesoderm-inducing factor (MIF) from X. laevis XTC cells (XTC-MIF)6,7 has properties similar to TGF-β, this factor is still unidentified. Recently, we obtained a number of homogeneous cell lines from the heterogeneous XTC population, which differ in their MIF production8. 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-β activity8. This observation, together with the identification of activin A as a potent MIF (ref. 9) 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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van den Eijnden-Van Raaij, A., van Zoelent, E., van Nimmen, K. et al. Activin-like factor from a Xenopus laevis cell line responsible for mesoderm induction. Nature 345, 732–734 (1990). https://doi.org/10.1038/345732a0
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DOI: https://doi.org/10.1038/345732a0
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