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Concept
Sirolimus
Summary
Sirolimus, also known as rapamycin and sold under the brand name Rapamune among others, is a macrolide compound that is used to coat coronary stents, prevent organ transplant rejection, treat a rare lung disease called lymphangioleiomyomatosis, and treat perivascular epithelioid cell tumor (PEComa). It has immunosuppressant functions in humans and is especially useful in preventing the rejection of kidney transplants. It is a mechanistic target of rapamycin kinase (mTOR) inhibitor that inhibits activation of T cells and B cells by reducing their sensitivity to interleukin-2 (IL-2).
It is produced by the bacterium Streptomyces hygroscopicus and was isolated for the first time in 1972, from samples of Streptomyces hygroscopicus found on Easter Island. The compound was originally named rapamycin after the native name of the island, Rapa Nui. Sirolimus was initially developed as an antifungal agent. However, this use was abandoned when it was discovered to have potent immunosuppressive and antiproliferative properties due to its ability to inhibit mTOR. It was approved by the U.S. Food and Drug Administration (FDA) in September 1999. Hyftor was approved for treatment of facial angiofibroma in the European Union in May 2023.
Sirolimus is indicated for the prevention of organ transplant rejection and for the treatment of lymphangioleiomyomatosis (LAM).
Sirolimus (Fyarro), as protein-bound particles, is indicated for the treatment of adults with locally advanced unresectable or metastatic malignant perivascular epithelioid cell tumor (PEComa).
In the EU, sirolimus, as Rapamune, is indicated for the prophylaxis of organ rejection in adults at low to moderate immunological risk receiving a renal transplant and, as Hyftor, is indicated for the treatment of facial angiofibroma associated with tuberous sclerosis complex.
Organ rejection and Immunosuppression#Deliberately induced
The chief advantage sirolimus has over calcineurin inhibitors is its low toxicity toward kidneys.
Official source
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