High Purity 99% USP Standard Anti cancer raw material powder Busulfan CAS 55-98-1

Busulfan More Info

Busulfan is a bifunctional alkylating agent primarily used in the treatment of chronic myelogenous leukemia (CML). Introduced in the clinical setting in the late 1950s, it has been utilized for its selective immunosuppressive effects on bone marrow. Its chemical designation is 1,4-butanediol dimethanesulfonate, and it is marketed under various trade names, including Myleran and Busulfex

Mechanism of Action

Busulfan functions by alkylating DNA, leading to the formation of intrastrand cross-links between guanine bases. This action prevents DNA strands from uncoiling and separating, which is crucial for DNA replication. The process disrupts both DNA replication and RNA transcription, ultimately triggering apoptosis in cancer cells. Specifically, the mechanism involves:
Formation of Carbonium Ions: After hydrolysis, busulfan releases carbonium ions that alkylate DNA.
SN2 Reactions: Guanine N7 nucleophilically attacks the carbon adjacent to the mesylate leaving group, resulting in cross-linking that cannot be repaired by cellular machinery

Applications

Busulfan is primarily used as an antitumor agent and is classified as a first-class carcinogen. It has been effective in treating chronic myeloid leukemia (CML), primary thrombocythemia, and other myeloproliferative disorders . It functions by cross-linking DNA with guanine bases, causing DNA damage and ultimately leading to cell death. Additionally, busulfan can inhibit thiol reductases and induce apoptosis.

Routes of Administration

Busulfan can be administered via:
1. Oral Route: Generally well absorbed from the gastrointestinal tract; however, bioavailability can vary significantly among individuals. It is recommended to take it on an empty stomach to minimize nausea.
2. Intravenous (IV) Route: Often used in a hospital setting for conditioning regimens before stem cell transplants. The dosing schedule typically involves administration every six hours over several days

Safety and Side Effects

While busulfan can effectively control tumor burden, it also carries a significant risk of side effects:
1. Bone Marrow Suppression: It can lead to severe depression of granulocyte and platelet counts, necessitating careful monitoring.
2. Pulmonary Toxicity: Characterized by dyspnea and cough, this may develop months to years after treatment.
3. Genotoxic Effects: Busulfan has been linked to chromosomal aberrations and mutations, raising concerns about its long-term carcinogenic potential.
Common side effects include nausea, vomiting, and gastrointestinal disturbances. Due to its potential for severe toxicity, therapeutic drug monitoring is essential to adjust dosages based on individual responses.

Pharmacokinetics

Busulfan exhibits a half-life of approximately 2–3 hours in adults. It is extensively metabolized in the liver primarily through glutathione-mediated processes. About 30% of the drug binds to plasma proteins, with rapid elimination from circulation. The drug also crosses the blood-brain barrier, which may have implications for its effects on central nervous system tissues.

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