Reversal of resistance against doxorubicin by a newly developed compound, oxalyl bis(N-phenyl)hydroxamic acid in vitro.

Abstract:

:A drug-resistant cell line (EAC/Dox) was developed by repeated exposure of Ehrlich ascites carcinoma cells to Doxorubicin (Dox) in vivo in male albino Swiss mice (6-8 weeks old). The weekly i.p. injections of Dox to mice (2 or 4 mg/kg/week for 4 months) gave rise to Dox-resistant cell line EAC/Dox, which displayed typical multidrug resistant (MDR) features of cross-resistance to a number of structurally and functionally unrelated drugs like doxorubicin, vinblastine and cisplatin. Moreover, the EAC/Dox cell line had lower drug accumulation than drug-sensitive (EAC/S) cells. Study of Western blots and immunofluorescence revealed that P-glycoprotein 170 kDa (P-gp) was absent in EAC/Dox cells. The drug resistance appeared to be due to the presence of a higher level of reduced glutathione (GSH) and glutathione S-transferase (GST) in EAC/Dox cells than in drug-sensitive (EAC/S) cells. The two structurally similar hydroxamic acid derivatives, i.e. oxalyl bis(N-phenyl)hydroxamic acid (X1) and succinyl bis(N-phenyl)hydroxamic acid (X2), having very low in vitro toxicity (IC50 value 250 microg/ ml), were investigated for their efficacy to reverse MDR. The compound X1 was able to reverse the effect of MDR and reduce GST in EAC/Dox cells. The compound X2 had no ability to reverse the effect of MDR. Further study on the mechanism of glutathione depletion and the resistance modifying property of X1 on other cell lines is warranted.

journal_name

Anticancer Drugs

journal_title

Anti-cancer drugs

authors

Choudhuri SK,Chatterjee A

doi

10.1097/00001813-199810000-00013

subject

Has Abstract

pub_date

1998-10-01 00:00:00

pages

825-32

issue

9

eissn

0959-4973

issn

1473-5741

journal_volume

9

pub_type

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