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Background  Myocardium regeneration in adult mammals is very limited, but has enormous therapeutic potentials. However, we are far from complete understanding the cellular and molecular mechanisms by which heart tissue can regenerate. The full functional ability of amphibians to regenerate makes them powerful animal models for elucidating how damaged mature organs are naturally reconstituted in an adult organism. Like other amphibians, such as newts and axolotls, adult  Xenopus  displays high regenerative capacity such as retina. So far, whether the adult frog heart processes regenerative capacity after injury has not been well delineated.    Results  We examined the regeneration of adult cardiac tissues of  Xenopus tropicalis  after resection of heart apex. We showed, for the first time, that the adult  X. tropicalis  heart can regenerate perfectly in a nearly scar-free manner approximately 30 days after injury via apical resection. We observed that the injured heart was sealed through coagulation immediately after resection, which was followed by transient fibrous tissue production. Finally, the amputated area was regenerated by cardiomyocytes. During the regeneration process, the cardiomyocytes in the border area of the myocardium adjacent to the wound exhibited high proliferation after injury, thus contribute the newly formed heart tissue.    Conclusions  Establishing a cardiac regeneration model in adult  X. tropicalis  provides a powerful tool for recapitulating a perfect regeneration phenomenon and elucidating the underlying molecular mechanisms of cardiac regeneration in an adult heart, and findings from this model may be applicable in mammals.    Electronic supplementary material  The online version of this article (10.1186/s13578-017-0199-6) contains supplementary material, which is available to authorized users.

Heart regeneration in adult Xenopus tropicalis after apical resection