Induction of in vitro resistance to 4'-epidoxorubicin and cis-dichlorodiammineplatinum in hepatoma cells.
We have developed in vitro resistance to 4'-epidoxorubicin (Epi-A) and cis-dichlorodiammineplatinum (cis-DDP) in one rat (MH1C1) and one human hepatoma cell line (HepG2). When compared to their parental cells, the Epi-A resistant rat cells were 17 times and the resistant human cells 27 times more resistant to Epi-A in terms of GI50 in the cell growth inhibition assay. The cis-DDP resistant rat cells were 20 times and the resistant human cells 12 times more resistant to cis-DDP. Cross-resistance to cis-DDP was observed in the Epi-A resistant rat cells but not in the human cells. The multidrug resistant gene product, GP 170, was markedly expressed in both Epi-A resistant substrains compared with their parent lines, suggesting a role of this protein in the development of resistance to Epi-A. Cadmium-binding proteins of metallothionein (MT) size bound 52% of cytosolic 109cadmium in the cis-DDP resistant human cells compared with 8% in the parental cells. This may indicate that these proteins contribute to the observed cis-DDP resistance.
Department of Clinical Pharmacology, University of Oslo, Rikshospitalet, Norway.
K S
KS
Hall
L
L
Endresen
H S
HS
Huitfeldt
H E
HE
Rugstad
D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000818:Animals; D006528:Carcinoma, Hepatocellular; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002945:Cisplatin / Q000494:pharmacology*; D046508:Culture Techniques / Q000379:methods; D004305:Dose-Response Relationship, Drug; D004351:Drug Resistance; D015251:Epirubicin / Q000494:pharmacology*; D005455:Fluorescent Antibody Technique; D006801:Humans; D008113:Liver Neoplasms; D008114:Liver Neoplasms, Experimental; D008562:Membrane Glycoproteins / Q000032:analysis; D051381:Rats; D014410:Tumor Stem Cell Assay
D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D008562:Membrane Glycoproteins; D015251:Epirubicin; D002945:Cisplatin