Title : Rapid up-regulation of mdr1 expression by anthracyclines in a classical multidrug-resistant cell line.

Pub. Date : 1995 May

PMID : 7734315






6 Functional Relationships(s)
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1 The induction of mdr1 RNA expression by three anthracyclines, (doxorubicin, daunorubicin, epirubicin), VP-16 and two vinca alkaloids (vincristine, vinblastine) was semiquantitatively assessed by scanning Northern blots on a phosphorimager. Epirubicin ATP binding cassette subfamily B member 1 Homo sapiens
2 A significant increase (P < 0.02) in expression of mdr1 was noted within 4 hrs of exposure to 1.5 micrograms ml-1 daunorubicin or epirubicin. Epirubicin ATP binding cassette subfamily B member 1 Homo sapiens
3 With increasing concentrations of daunorubicin or epirubicin in a fixed 24 h time period, mdr1 expression increased, although a biphasic response was seen. Epirubicin ATP binding cassette subfamily B member 1 Homo sapiens
4 Based on MRK 16 binding, an increase in P-gp levels was seen in the CEM/A7R line after a 24 h exposure to 1 microgram ml-1 daunorubicin or epirubicin. Epirubicin ATP binding cassette subfamily B member 1 Homo sapiens
5 The rapid increase in mdr1 expression after a short period of exposure to doxorubicin, daunorubicin or epirubicin suggests that induction of mdr1 expression may have an important role in the development of drug-resistant tumours. Epirubicin ATP binding cassette subfamily B member 1 Homo sapiens
6 The rapid increase in mdr1 expression after a short period of exposure to doxorubicin, daunorubicin or epirubicin suggests that induction of mdr1 expression may have an important role in the development of drug-resistant tumours. Epirubicin ATP binding cassette subfamily B member 1 Homo sapiens