To characterize the membrane changes related to adriamycin (ADM) resistance in tumor cells, we have developed monoclonal antibodies against an ADM-resistant subline of human myelogenous leukemia K562 ( K562 ADM), and reported the overexpression of P-glycoprotein and 85-kDa protein as determined by the antibodies. In the present study, we have established a monoclonal antibody, MRK18, with higher reactivity to K562 ADM than to K562. MRK18 also showed higher reactivity to other human ADM-resistant lines, 2780AD and Hattori/ADM, than the corresponding parental lines. MRK18 also reacted to human breast cancer MCF-7 and human T-lymphoma CCRF-CEM which have never been exposed to anticancer agents in culture. MRK18 recognized a 300-kDa membrane protein of K562 ADM and MCF-7 and inhibited the growth of these cell lines in culture. These results indicate an induction of the 300-kDa protein during the development of ADM resistance.
|Number of pages||6|
|Journal||Biochemical and Biophysical Research Communications|
|Publication status||Published - 1990 Jun 15|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology