Difference between the resistance mechanisms of aclacinomycin- and adriamycin-resistant P388 cell lines.

Abstract:

:Aclacinomycin (ACR) is an anthracycline anticancer drug that shows marked effects in Adriamycin (ADM)-resistant tumors. ADM, however, is not effective against ACR-resistant tumor cells. When tumor cells acquire resistance to ACR, though the resistance is not easily acquired, they show strong cross-resistance to ADM. To study the mechanism underlying these phenomena, we studied the resistance mechanism of ACR- and ADM-resistant P388 leukemia cells. The P388/ACR cells showed 4.9- and 100-fold resistance to ACR and ADM, respectively, whereas the P388/ADM cells showed respectively 2.0- and 270-fold resistance. Both P388/ACR and P388/ADM cells expressed large amounts of P-glycoprotein, and the amount was 3-fold higher in the P388/ACR than in the P388/ADM cells. As a result, the accumulation of vincristine and ADM were greatly reduced in P388/ACR and P388/ADM cells, as compared with the parental P388 cells. The accumulation of ACR, however, was moderately reduced in both the resistant cell lines. ACR accumulation in P388/ACR and P388/ADM cells was reduced to respectively 37 and 64% of the level in P388 cells. The amount and the activity of topoisomerase II were comparable in P388 and P388/ACR cells, but they were reduced in P388/ADM cells. Consequently, the formation of protein (topoisomerase II)-DNA cross-links induced by a topoisomerase II inhibitor was more prominent in the P388 and P388/ACR nuclei than in the P388/ADM nuclei. Notably, ACR could reduce the protein-DNA cross-links equally in the nuclei of P388, P388/ACR, and P388/ADM cells.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Oncol Res

journal_title

Oncology research

authors

Dong J,Naito M,Tatsuta T,Seimiya H,Johdo O,Tsuruo T

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

245-52

issue

5

eissn

0965-0407

issn

1555-3906

journal_volume

7

pub_type

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