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Unidirectional Cross-Activation of GRPR by MOR1D Uncouples Itch and Analgesia Induced by Opioids

Open access
Liu, Xian-Yu, Liu, Zhong-Chun, Sun, Yan-Gang, Ross, Michael, Kim, Seungil, Tsai, Feng-Fang, Li, Qi-Fang, Jeffry, Joseph, Kim, Ji-Young, Loh, Horace H., Chen, Zhou-Feng·2011·Cell

Abstract

SUMMARY Why do opiates make human beings itch ? Spinal opioid-induced itch, a prevalent side effect of pain management, has been considered to occur as a result of pain inhibition. We report that morphine-induced scratching (MIS) is abolished in mice lacking either gastrin-releasing peptide receptor (GRPR) or the μ opioid receptor (MOR). Using exon-specific knockdown, we identified the MOR1D isoform as essential for MIS, whereas MOR1 is important for morphine-induced analgesia (MIA) with no cross activity present. MOR1D and GRPR form constitutive heterodimers in the spinal cord and relay itch information upon morphine activation. Morphine induces internalization of both GRPR and MOR1D, whereas GRP induces that of GRPR but not MOR1D, when co-expressed. Moreover, GRP-induced scratching (GIS) is independent of MOR activation. These results suggest a unidirectional cross-activation of GRPR signaling by MOR1D via heterodimerization, and that opioid-induced itch is an active process concomitant with but independent of opioid analgesia.

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Crossref · 10.1016/j.cell.2011.08.043

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Metadata

Authors
Liu, X.-Y., Liu, Z.-C., Sun, Y.-G., Ross, M., Kim, S., Tsai, F.-F., Li, Q.-F., Jeffry, J., Kim, J.-Y., Loh, H. H., & Chen, Z.-F.
Venue
Cell
Publisher
Elsevier BV
Published
2011-10
Volume
147
Issue
2
Pages
447-458
ISSN
0092-8674 (ISSN-L)
OpenAlex
W1997444760
Cited by
291
References
66
FWCI
15.41
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Unidirectional Cross-Activation of GRPR by MOR1D Uncouples Itch and Analgesia Induced by Opioids. https://app.cochat.ai/papers/10.1016/j.cell.2011.08.043
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Liu, X.-Y., Liu, Z.-C., Sun, Y.-G., Ross, M., Kim, S., Tsai, F.-F., Li, Q.-F., Jeffry, J., Kim, J.-Y., Loh, H. H., & Chen, Z.-F. (2011). Unidirectional Cross-Activation of GRPR by MOR1D Uncouples Itch and Analgesia Induced by Opioids. Cell. https://doi.org/10.1016/j.cell.2011.08.043

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