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British Journal of Cancer logoLink to British Journal of Cancer
. 1998 Apr;77(7):1089–1096. doi: 10.1038/bjc.1998.181

Expression of gamma-glutamylcysteine synthetase (gamma-GCS) and multidrug resistance-associated protein (MRP), but not human canalicular multispecific organic anion transporter (cMOAT), genes correlates with exposure of human lung cancers to platinum drugs.

T Oguri 1, Y Fujiwara 1, T Isobe 1, O Katoh 1, H Watanabe 1, M Yamakido 1
PMCID: PMC2150117  PMID: 9569044

Abstract

We examined the steady-state levels of mRNA for gamma-glutamylcysteine synthetase (gamma-GCS), multidrug resistance-associated protein (MRP) and human canalicular multispecific organic anion transporter (cMOAT) in human lung cancer specimens to elucidate their roles in relation to platinum drug resistance in vivo. Seventy-six autopsy samples (38 primary tumours and their corresponding normal lung tissues) obtained from 38 patients were analysed using the quantitative reverse transcription polymerase chain reaction (RT-PCR) method. Both subunits (heavy and light subunits) of gamma-GCS expression levels of normal lung and tumour tissues exposed to platinum drugs during life were significantly higher than those of non-exposed tissues, whereas only the MRP expression levels of tumours were elevated in association with ante-mortem platinum drug exposure. The gamma-GCS and MRP expression levels correlated significantly. The cMOAT expression levels did not correlate with ante-mortem platinum drug exposure. Next, we monitored gamma-GCS heavy subunit expression levels in peripheral mononuclear cells of eight previously untreated lung cancer patients after platinum drug administration, which revealed that these drugs induced gamma-GCS expression in vivo. These results suggest that gamma-GCS expression is induced by platinum drugs in vivo and/or the physiological stress response to xenobiotics.

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Selected References

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