Increased P-glycoprotein expression and multidrug-resistant gene (mdr1) amplification are infrequently found in fresh acute leukemia cells. Sequential analysis of 15 cases at initial presentation and relapsed stage

Y. Ito, M. Tanimoto, T. Kumazawa, M. Okumura, Y. Morishima, R. Ohno, H. Saito

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Abstract

Using a DNA probe of mdr1 and an anti-P-glycoprotein monoclonal antibody (MRK16), the authors investigated 19 cases of adult acute leukemia patients (one M1, six M2, three M3, one M4, three M5, two L1, and three L2), comparing leukemia cells at the initial presentation (I) with those at the relapsed stage (R). By Southern hybridization analysis mdr1 DNA levels were not amplified in 32 samples from 19 patients (I: 14, R: 18). By Northern hybridization analysis mdr1 mRNA levels were not expressed in ten samples from seven patients (I: 4, R: 6). By indirect immunofluorescent assay with MRK16 antibody P-glycoprotein was not detected in 30 samples from 18 patients (I: 13, R: 17). Thus, P-glycoprotein expression and mdr1 gene amplification occurred infrequently not only in leukemia cells at the initial presentation but also in those at the relapsed cases and may not be a major cause of refractoriness to antileukemia drugs in adult acute leukemia.

Original languageEnglish
Pages (from-to)1534-1538
Number of pages5
JournalCancer
Volume63
Issue number8
Publication statusPublished - 1989
Externally publishedYes

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Gene Amplification
P-Glycoprotein
Leukemia
DNA Probes
Monoclonal Antibodies
Messenger RNA
Antibodies
DNA
Pharmaceutical Preparations

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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Increased P-glycoprotein expression and multidrug-resistant gene (mdr1) amplification are infrequently found in fresh acute leukemia cells. Sequential analysis of 15 cases at initial presentation and relapsed stage. / Ito, Y.; Tanimoto, M.; Kumazawa, T.; Okumura, M.; Morishima, Y.; Ohno, R.; Saito, H.

In: Cancer, Vol. 63, No. 8, 1989, p. 1534-1538.

Research output: Contribution to journalArticle

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AU - Okumura, M.

AU - Morishima, Y.

AU - Ohno, R.

AU - Saito, H.

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