Abstract
We show that cisplatin resistance in certain lung cancer cell lines can be reversed through inhibition of mTOR (mammalian Target of Rapamycin). These cell lines appear to possess high levels of phospho-mTOR, phospho-AKT and other growth-related proteins, such as hTERT (human telomerase reverse transcriptase), and Cyclin D3 which decrease upon inhibition of mTOR. Interestingly in one cisplatin resistant cell line which expresses BCL2/BCLxL, treatment with mTOR inhibitor (CCI-779) results in decreased levels of these anti-apoptotic proteins and may contribute to increasing apoptosis. Moreover, continuous exposure to CCI-779 was found to increase the expression of the multi-drug resistant P-gp1(P-gycoprotein1) efflux pump and therefore should be taken into consideration when designing clinical trials with this compound.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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ATP Binding Cassette Transporter, Subfamily B, Member 1 / drug effects
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ATP Binding Cassette Transporter, Subfamily B, Member 1 / metabolism
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Antineoplastic Agents / pharmacology*
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Carcinoma, Non-Small-Cell Lung / drug therapy
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Carcinoma, Non-Small-Cell Lung / pathology
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Carcinoma, Small Cell / drug therapy
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Carcinoma, Small Cell / pathology
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Cell Line, Tumor
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Cisplatin / pharmacology*
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Down-Regulation / drug effects
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Drug Resistance, Neoplasm / drug effects*
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Gene Expression Regulation, Neoplastic / drug effects
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Humans
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Lung Neoplasms / drug therapy
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Lung Neoplasms / pathology
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Phosphorylation / drug effects
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Protein Kinases / drug effects*
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Protein Kinases / metabolism
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Proto-Oncogene Proteins c-bcl-2 / drug effects
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Proto-Oncogene Proteins c-bcl-2 / metabolism
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Sirolimus / analogs & derivatives
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Sirolimus / pharmacology
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TOR Serine-Threonine Kinases
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bcl-X Protein / drug effects
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bcl-X Protein / metabolism
Substances
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ATP Binding Cassette Transporter, Subfamily B, Member 1
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Antineoplastic Agents
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Proto-Oncogene Proteins c-bcl-2
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bcl-X Protein
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temsirolimus
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Protein Kinases
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MTOR protein, human
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TOR Serine-Threonine Kinases
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Cisplatin
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Sirolimus