Abstract
LIMB development is dependent on epithelial–mesenchymal interactions. The apical ectodermal ridge (AER), a specialized epithelium at the limb tip, stimulates proliferation of underlying mesenchyme, causing directed limb outgrowth1 (for review see ref. 2). Several genes are expressed in the mouse AER3–10, including Fgf-4 (fibroblast growth factor-4)11,12 and Bmp-2 (bone mor-phogenetic protein-2)13, both of which encode secreted signalling molecules. Using a culture system developed to explore the function of molecules produced by the AER, we have shown that FGF-4 protein stimulates proliferation of mesenchyme in the early mouse limb-bud. This suggests that FGF-4 serves that major function of the AER. In contrast, BMP-2 inhibits limb growth, suggesting that as a result the AER may serve a hitherto unrecognized inhibitory function. Furthermore, the extent of limb outgrowth can be modulated by mixing the two signalling molecules, suggesting that limb growth is regulated by a combination of stimulatory and inhibitory signals from the AER.
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Niswander, L., Martin, G. FGF-4 and BMP-2 have opposite effects on limb growth. Nature 361, 68–71 (1993). https://doi.org/10.1038/361068a0
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DOI: https://doi.org/10.1038/361068a0
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