| Literature DB >> 1979977 |
Y Heike1, H Hamada, N Inamura, S Sone, T Ogura, T Tsuruo.
Abstract
Mouse monoclonal antibodies (MRK16 and MRK17) against human multidrug-resistant cancer cell lines were tested for antibody-dependent cytotoxicity mediated by human blood mononuclear cells, using a 4-h 51Cr release assay. MRK16 (IgG2a isotype) was shown to be more effective than MRK17 (IgG1 isotype). Moreover, when four pairs of drug-resistant and their parent sensitive human cancer cells were tested for antibody-dependent cell-mediated cytolysis (ADCC) using MRK16, only the drug-resistant cell lines were susceptible to ADCC reaction. When highly purified lymphocytes (greater than 99%) and monocytes (greater than 97%) were isolated from blood mononuclear cells by centrifugal elutriation and adherence, MRK16 promoted both lymphocyte- and monocyte-mediated tumor cell killing, whereas MRK17 induced only a lymphocyte-mediated ADCC reaction. These results suggest that MRK16 of IgG2a subtype may be a useful therapeutic agent in eradication of drug-resistant cancer cells expressing P-glycoprotein through ADCC reaction.Entities:
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Year: 1990 PMID: 1979977 PMCID: PMC5917982 DOI: 10.1111/j.1349-7006.1990.tb02528.x
Source DB: PubMed Journal: Jpn J Cancer Res ISSN: 0910-5050