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The role of tricyclic drugs in selective triggering of mitochondrially-mediated apoptosis in neoplastic glia: a therapeutic option inmalignant glioma? = Pomen tricikličnih zdravil pri selektivnem proženju mitohondrijske apoptoze pri neoplastični gliji. Nova možnost zdravljenja malignih gliomov?Pilkington, Geoffrey J. ; Akinwunmi, James ; Amar, SabinaWe have previously demonstrated that the tricyclic antidepressant, Clomipramine, exerts a concentration - dependent, tumor cell specific, pro-apoptotic effect on human glioma cells in vitro and than ... this effect is not mirrored in non-neoplastic human astrocytes. Moreover, the drug acts by triggering mitochondrially-mediated apoptosis by way of complex 3 of the respiratory chain. Here, through reduced reactive oxygen species and neoplastic cell specific, altered membrane potential, cytochrome c is released, thereby activating a caspase pathway to apoptosis. In addition, while we and others have shown that further antidepressants, including those of the selective serotonin reuptake inhibitor (SSRI) group, also mediate cancer cell apoptosis in both glioma and lymphoma, clomipramine appears to be most effective in this context. More recently, other groups have reported thatclomipramine causes apoptosis, preceded by a rapid increase in p-c-Jun levels, cytochrome c release from mitochondria and increased caspase-3 like activity. In addition to clomipramine we have investigated the possible pro-apoptotic activity of a range of further tricyclic drugs. Only two such agents (amitriptyline and doxepin) showed a similar, or better, effect when compared with clomipramine. Since both orally administered clomipramine and amitriptyline are metabolised to desmethly clomipramine (norclomipramine) and nortriptyline respectively it is necessary for testing at a tumour cell level to be carried out with both the parent tricyclic and the metabolic product. Inaddition, reversal of multidrug resistance in a number of solid cancers following treatment with both clomipramine and amitriptyline has been reported. This additional role for tricyclics may be of some significance in the treatment of primary and secondary brain tumours. (Abstract truncated at 2000 characters)Source: Radiology and oncology. - ISSN 1318-2099 (Letn. 40, št. 2, 2006, str. 73-85)Type of material - article, component partPublish date - 2006Language - englishCOBISS.SI-ID - 21603033
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Pilkington, Geoffrey J. | |
Akinwunmi, James | |
Amar, Sabina |
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