In the process of amphibian development, an embryonic body plan is established through cell division, sequential gene expression, morphogenesis and cell differentiation. The mechanism of body patterning is complex and includes multiple induction events. Activin, a TGF-beta family protein, can induce several kinds of mesodermal and endodermal tissues in animal cap explants in a dose-dependent manner. In a recent study of the role of activin in organogenesis, we succeeded in raising a beating heart by treating animal caps with a high concentration of activin. Activin also participates in kidney organogenesis in combination with retinoic acid. An embryonic kidney induced by activin and retinoic acid in vitro can function in vivo when it is transplanted into a larva in which pronephros rudiments have already been removed. Further, the activin-treated animal caps clearly show organizer actions that are closely related to body patterning along the anteroposterior axis. These experiments will help to serve as a model system for understanding organogenesis and body patterning at the cellular and molecular levels.
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