Indications
Cisplatin is primarily prescribed for the treatment of specific types of cancers, including metastatic testicular and ovarian tumors, as well as advanced bladder cancer. Its use in these conditions reflects its efficacy in targeting rapidly dividing cancer cells and hindering their proliferation.
Pharmacodynamics
As a member of the alkylating agent class, cisplatin serves as an antineoplastic agent effective in various cancer treatments. Alkylating agents function by introducing alkyl groups to various electronegative sites, interfering with cellular processes. Specifically, cisplatin cross-links guanine bases within DNA double-helix strands, impeding their ability to uncoil and separate, a crucial step for DNA replication. This disruption prevents cancer cells from successfully dividing. Additionally, these agents attach methyl or other alkyl groups inappropriately to molecules, leading to errors in base pairing and DNA miscoding. Although these agents do not target a specific phase of the cell cycle, they ultimately disrupt DNA function and induce cell death through multiple mechanisms.
Absorption
Upon administration of cisplatin at doses ranging from 20 to 120 mg/m², platinum concentrations are prominently detected in organs such as the liver, prostate, and kidney. Moderate levels are found in tissues like the bladder, muscle, testicle, pancreas, and spleen, with the lowest concentrations observed in the bowel, adrenal glands, heart, lungs, cerebrum, and cerebellum. Remarkably, platinum remains in these tissues for up to 180 days following the last dose, indicating a prolonged presence and potential for sustained therapeutic effects.
Mechanism of Action
Cisplatin operates through a multifaceted mechanism that primarily disrupts DNA function. First, it attaches alkyl groups to DNA bases, leading to fragmentation as repair enzymes fail to replace these alkylated bases, thereby hindering DNA synthesis and RNA transcription. Additionally, Cisplatin facilitates DNA damage by forming cross-links between DNA atoms, inhibiting the separation of DNA strands essential for replication and transcription processes. Furthermore, it induces nucleotide mispairing, ultimately causing mutations within the DNA sequence. Collectively, these actions effectively impede cell proliferation and promote apoptotic cell death.
