Abstract
Exogenous application of neurotrophic growth factors has emerged as a new and particularly promising approach not only to promote functional recovery after acute brain injury but also to protect neurons against the immediate effect of the injury. Among the various growth factors and cytokines studied so far, the neuroprotective and neurotrophic profile of basic fibroblast growth factor (bFGF) is the best documented1,2,3,4,5. Using an animal model of acute excitotoxic brain injury6, we report here that the neuroprotective action of bFGF, which is now being tested in stroke patients, depends on the induction of activin A, a member of the transforming growth factor-β superfamily. Our evidence for this previously unknown mechanism of action of bFGF is that bFGF strongly enhanced lesion-associated induction of activin A; in the presence of the activin-neutralizing protein follistatin, bFGF was no longer capable of rescuing neurons from excitotoxic death; and recombinant activin A exerted a neuroprotective effect by itself. Our data indicate that the development of substances influencing activin expression or receptor binding should offer new ways to fight neuronal loss in ischemic and traumatic brain injury.
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Acknowledgements
We thank B. Sutor (Department of Physiology, University of Munich, Germany) for letting us use his image analysis system and G. Klausa for help with nerve cell counting. The immunofluorescence micrographs were acquired using the equipment of J. Büttner-Ennever (Department of Anatomy, University of Munich, Germany) with the help of A. Messoudi. We thank R. Grose for reading the manuscript. This work was supported by the German Ministry for Education and Research (BMBF). C.A. is a Heisenberg fellow of the Deutsche Forschungsgemeinschaft.
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Tretter, Y., Hertel, M., Munz, B. et al. Induction of activin A is essential for the neuroprotective action of basic fibroblast growth factor in vivo. Nat Med 6, 812–815 (2000). https://doi.org/10.1038/77548
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DOI: https://doi.org/10.1038/77548
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