Abstract: A method of promoting nerve regeneration in a subject that includes administering to the subject a therapeutically effective amount of a composition that includes at least one therapeutically-active extract fraction of Centella asiatica. One example of making the extract fraction of Centella asiatica involves extracting Centella asiatica plant material resulting in an extract residue and successively fractionating the Centella asiatica extract residue with at least two eluants of increasing polarity.

Abstract: FK506 and geldanamycin promote nerve regeneration by a common mechanism that involves the binding of these compounds to polypeptide components of steroid receptor complexes other than the steroid hormone binding portion of the complex (FKBP52 and hsp90, respectively). These and other agents cause hsp90 dissociation from steroid receptor complexes or block association of hsp90 with steroid receptor complexes.

Abstract: Analogs of FK506 that do not bind FKBP-12 have been found to effectively promote nerve cell growth and regeneration, thereby speeding functional recovery of damaged nervous tissue and axonal regeneration without causing immunosuppression.

Abstract: Tacrolimus derivatives having high levels of neurotrophic activity and low levels of immunosuppressive activity. These compounds are useful as neurotrophic agents, particularly, for preventing or treating neuronal injury/dysfunction.