Sirolimus (rapamycin), an inhibitor of in-stent restenosis inthe coronary arteries, is having a substantial effect on thecare of patients with coronary artery disease, was discoveredin a soil sample from Easter Island (known locally as Rapa Nui).A naturally occurring product that is isolated from Streptomyceshygroscopicus, sirolimus is an extremely lipophilic (hydrophobic)macrolide that was initially developed as an antifungal agenton the basis of its ability to inhibit the growth of yeast.However, sirolimus was quickly observed to have potent immunosuppressiveactivity in mammals, which put a halt to its development asan antibiotic.
From the Department of Physiology and Cellular Biophysics, Center for Molecular Cardiology, Columbia University College of Physicians and Surgeons, New York.
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