2018
DOI: 10.1101/443663
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Opioids trigger breast cancer metastasis through E-Cadherin downregulation and STAT3 activation promoting epithelial-mesenchymal transition

Abstract: The opioid crisis of pain medication bears risks from addiction to cancer progression, but little experimental facts exist. Expression of δ-opioid receptors (DORs) correlates with poor prognosis for breast cancer (BCa) patients, but mechanism and genetic/pharmacologic proof of key changes in opioid-triggered cancer biology are lacking. We show that oncogenic STAT3 signaling and E-Cadherin downregulation are triggered by opioid-ligated DORs, promoting metastasis. Human and murine transplanted BCa cells (MDA-MB-… Show more

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Cited by 2 publications
(2 citation statements)
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“…5,7 The role of ORPD1 is less clear, with antitumour associations shown in TNBC specifically, 45 but also protumour associations in breast cancer generally. 46,47 A variety of evidence links OPRM1 expression to protumour outcomes in cancer. 28,39,40 We found in TNBC that differential expression of these receptor genes is consistent with a net protective effect of opioid agonism: protumour receptors are either not expressed (OPRM1) or downregulated (TLR4), while antitumour receptors (OGFR, OPRK1, OPRD1) are upregulated.…”
Section: Discussionmentioning
confidence: 99%
“…5,7 The role of ORPD1 is less clear, with antitumour associations shown in TNBC specifically, 45 but also protumour associations in breast cancer generally. 46,47 A variety of evidence links OPRM1 expression to protumour outcomes in cancer. 28,39,40 We found in TNBC that differential expression of these receptor genes is consistent with a net protective effect of opioid agonism: protumour receptors are either not expressed (OPRM1) or downregulated (TLR4), while antitumour receptors (OGFR, OPRK1, OPRD1) are upregulated.…”
Section: Discussionmentioning
confidence: 99%
“…As for the other opioid receptor targets, the OGFR has shown inhibitory effects in tumor growth ( 3 ), while the role of DOR and KOR are even more controversial with data showing both activating ( 24 ) and suppressing effects ( 25 ) which can be explained by a different profile of receptor expression ( 16 ). In addition, activated opioid receptors trigger several intracellular responses that are responsible for their divergent pharmacological outcomes.…”
Section: Introductionmentioning
confidence: 99%