High Quality GMP 99% Pharmaceutical Raw Sirolimus Rapamycin Powder CAS 53123-88-9

Sirolimus/Rapamycin More Info

Sirolimus, also known as rapamycin, is an immunosuppressant drug that is primarily used to prevent organ transplant rejection and to treat certain rare diseases. It is classified as a macrolide antibiotic and is notable for its unique mechanism of action that differentiates it from other immunosuppressants.

Mechanism of Action

Sirolimus exerts its effects by inhibiting the mammalian target of rapamycin (mTOR), a crucial serine/threonine kinase involved in regulating cell growth, proliferation, and survival. The mechanism involves:
Binding to FKBP12: Sirolimus forms a complex with the intracellular protein FK506-binding protein 12 (FKBP12). This complex then binds to mTOR, inhibiting its activation.
Inhibition of T-Cell Proliferation: By inhibiting mTOR, sirolimus disrupts the signaling pathways that are essential for T-cell activation and proliferation in response to cytokines such as interleukin-2 (IL-2). This prevents T-cells from progressing from the G1 phase to the S phase of the cell cycle.
Antibody Production Suppression: Sirolimus also inhibits B-cell activation and antibody production, further contributing to its immunosuppressive effects.

Applications

Sirolimus is indicated for:
Organ Transplantation: Primarily used to prevent rejection in kidney transplants, often in combination with other immunosuppressants like calcineurin inhibitors.
Lymphangioleiomyomatosis (LAM): A rare lung disease characterized by abnormal smooth muscle cell proliferation.
Perivascular Epithelioid Cell Tumor (PEComa): Approved for treatment in adults with locally advanced unresectable or metastatic PEComa.
Cardiovascular Applications: Used as a coating on drug-eluting stents to prevent restenosis by inhibiting smooth muscle cell proliferation.

Routes of Administration

Sirolimus is administered orally. The typical dosing regimen includes:
Initial Dose: An initial loading dose of 6 mg is often given.
Maintenance Dose: Followed by a maintenance dose of 2 mg daily.

Safety and Side Effects

While sirolimus is generally well-tolerated, it can cause several side effects:
Common Side Effects: Hyperlipidemia (increased cholesterol and triglycerides), thrombocytopenia (low platelet count), anemia, and leukopenia (low white blood cell count).
Renal Effects: Although sirolimus is less nephrotoxic than calcineurin inhibitors, it can still lead to renal function impairment in some patients.
Metabolic Abnormalities: Hypophosphatemia (low phosphate levels), hyperkalemia (high potassium levels), peripheral edema, and weight gain may occur.
Respiratory Issues: Upper respiratory infections, dyspnea, and pharyngitis have been reported.
Other Reactions: Fever, rashes, tremors, and post-transplant lymphoproliferative disorder.

Pharmacokinetics

Sirolimus has distinct pharmacokinetic properties:
Absorption: Sirolimus is well absorbed from the gastrointestinal tract. Peak plasma concentrations are typically reached within 1–3 hours after oral administration.
Distribution: It has a large volume of distribution (~12 L/kg) and is approximately 92% bound to plasma proteins.
Metabolism: Sirolimus is primarily metabolized by the liver via cytochrome P450 3A4 (CYP3A4) enzymes. It is also a substrate for P-glycoprotein (P-gp).
Elimination: The elimination half-life ranges from 30 to 60 hours. It is excreted mainly through feces (approximately 90%), with renal excretion accounting for about 5–10%.

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