Rapamycin (also known as Sirolimus) is macrocyclic lactone produced by the bacterium Streptomyces hygroscopicus isolated from soil samples from Easter Island. Rapamycin is an antifungal agent with immunosuppressive properties. Rapamycin has antirejection properties without the side effects associated with other antirejection agents. Rapamycin binds to a specific protein, Target of Rapamycin (TOR). TOR is serine/threonine kinase. TOR (mTOR) forms two major complexes: mTORC1,and mTORC2. The mTORC1 consists of mTOR, Raptor, mLST8, FKBP38, PRAS40, and Deptor, and through specific binding of rapamycin to FKBP12, rapamycin inhibits the activity of mTORC1 leading to a decrease in protein synthesis, increased autophagy and inhibition of cell growth.
Recent studies and investigation in mice have demonstrated the potential of Rapamycin to slow aging. Rapamycin is being tested in dogs for its anti-aging properties.
Additional Reading - Rapamycin: Most Commonly Asked Questions
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