| ¿µ¹® | alkylating agent | ÇÑ±Û | ¾ËųȾ๰ |
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| DTIC | Dimethyl Triazeno Imidazole Carboxamide ; Alkylating Agent |
|---|---|
| AAT | Aachen Aphasia Test; academic aptitude test; alanine aminotransferase; alkylating agent therapy; alp... |
| ALK, alk | alkaline; alkylating |
| AA | alkylating agent |
|---|
| alkylating agent | <oncology, pharmacology> A reagent that places an alkyl group, for example propyl in place of a nucleophilic group in a molecule. Alkylating reagents include a number of cytotoxic drugs some of which react fairly specifically with N7 of the purine ring and lead to depurination of DNA, for example the agent ethyl ethanesulphonic acid and thus to mutagenesis. The drugs interaction with DNAand prevents the division of the cells. Examples of drugs include: busulphan, chlorambucil, cyclophosphamide, melphalan. (29 Sep 1997) |
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| alkylating agents | Highly reactive chemicals that introduce alkyl radicals into biologically active molecules and thereby prevent their proper functioning. Many are used as antineoplastic agent, but most are very toxic, with carcinogenic, mutagenic, teratogenic, and immunosuppressant actions. They have also been used as components in poison gases. (12 Dec 1998) |
| antineoplastic agent, alkylating | A class of drugs that differs from other alkylating agents used clinically in that they are monofunctional and thus unable to cross-link cellular macromolecules. Among their common properties are a requirement for metabolic activation to intermediates with antitumour efficacy and the presence in their chemical structures of n-methyl groups, that after metabolism, can covalently modify cellular DNA. The precise mechanisms by which each of these drugs acts to kill tumour cells are not completely understood. (12 Dec 1998) |
| alkylating a. |
a highly reactive compound that can substitute alkyl groups for the hydrogen atoms of certain organic compounds. Such agents are cytotoxic, producing their effects by the scission and cross-linking of DNA chains, and are not cell cyclespecific, but cell killing occurs primarily in rapidly proliferating tissues in which there is not time between mitoses for DNA repair systems to reverse the effects of the agent. Classes of antineoplastic alkylating agents include nitrogen mustards, ethylenimine derivatives, alkyl sulfonates, nitrosoureas, triazenes, and platinum compounds. Hematopoietic, reproductive, and epithelial tissues are particularly sensitive to alkylating agents, and their use may cause depressed blood cell counts, amenorrhea or impaired spermatogenesis, damage to intestinal mucosa, alopecia, and increased risk of malignancy.
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