Abstract:
:The modulating effect on drug resistance of amiodarone (AM) and its metabolite desethylamiodarone (DEA) was studied in a P-glycoprotein-positive human colon carcinoma cell line COLO 320, and a human small-cell lung carcinoma cell line GLC4 and its adriamycin (Adr)-resistant subline GLC4-Adr (both P-glycoprotein-negative). AM, DEA and verapamil induced an increase in cytotoxicity of Adr, vincristine and etoposide (VP16) in COLO 320 cells, while in the GLC4 and GLC4-Adr cell line no effect was seen. In the COLO 320 cell line, AM caused more intracellular, and especially intranuclear, fluorescence of Adr and more Adr-induced DNA strand breaks as compared to Adr alone. Moreover, an increase in VP16-induced topoisomerase II-DNA complexes was observed when AM was added. Competition between AM and Adr for the same efflux pump was suggested in efflux studies. The colony-forming unit granulocyte macrophage (CFU-GM) assay showed no increase in cytotoxicity of Adr when AM was added. Fourteen patients with Adr-resistant tumors were treated with Adr and AM. In these patients, peak serum levels of AM plus DEA of 10 microM were reached. Patient serum (20%) obtained after the first i.v. AM infusion induced in vitro significantly more cell kill of Adr in COLO 320 cells. Apart from a transient first-degree AV block in one patient, no cardiac toxicity was observed with the combination of Adr and AM. Bone-marrow toxicity was the same as expected from Adr alone in these patients. One of the 13 evaluable patients obtained a partial remission.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
van der Graaf WT,de Vries EG,Uges DR,Nanninga AG,Meijer C,Vellenga E,Mulder PO,Mulder NHdoi
10.1002/ijc.2910480422keywords:
subject
Has Abstractpub_date
1991-06-19 00:00:00pages
616-22issue
4eissn
0020-7136issn
1097-0215journal_volume
48pub_type
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