Overexpression of the μ-opioid receptor in human non-small cell lung cancer promotes Akt and mTOR activation, tumor growth, and metastasis

Anesthesiology
Frances E LennonPatrick A Singleton

Abstract

Recent epidemiologic studies suggesting that there were differences in cancer recurrence contingent on anesthetic regimens have raised the possibility that μ-opioid agonists can influence cancer progression. Based on our previous studies indicating the μ-opioid receptor (MOR) is up-regulated in several types of non-small cell lung cancer, this study examined the functional significance of MOR overexpression to elucidate a possible mechanism for the epidemiologic findings. Stable vector control and MOR1 overexpressing human bronchioloalveolar carcinoma cells were evaluated using immunoblot analysis, proliferation and transendothelial extravasation assays with or without Akt inhibitor, mTOR inhibitor (temsirolimus), or the peripheral MOR antagonist, methylnaltrexone. In human lung cancer xenograft models, primary tumor growth rates and lung metastasis were analyzed using consecutive tumor volume measurements and nestin immunoreactivity in lungs of the nude mouse model. The authors provide evidence that MOR is an important regulator of lung cancer progression. MOR overexpression increased Akt and mTOR activation, proliferation, and extravasation in human bronchioloalveolar carcinoma cells. In vivo, overexpression of MOR in human b...Continue Reading

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