Résumé
Opioids, agonists of µ-opioid receptors (µORs), are the strongest pain killers clinically available. Their action includes a strong central component, which also causes important adverse effects. However, µORs are also found on the peripheral endings of nociceptors and their activation there produces meaningful analgesia. The cellular mechanisms downstream of peripheral µORs are not well understood. Here, we show in neurons of murine dorsal root ganglia that pro- nociceptive TRPM3 channels, present in the peripheral parts of nociceptors, are strongly inhibited by µOR activation, much more than other TRP channels in the same compartment, like TRPV1 and TRPA1. Inhibition of TRPM3 channels occurs via a short signaling cascade involving Gβγ proteins, which form a complex with TRPM3. Accordingly, activation of peripheral µORs in vivo strongly attenuates TRPM3-dependent pain. Our data establish TRPM3 inhibition as important consequence of peripheral µOR activation indicating that pharmacologically antagonizing TRPM3 may be a useful analgesic strategy.
Langue d'origine | English |
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Numéro d'article | e26280 |
Journal | eLife |
Volume | 6 |
DOI | |
Statut de publication | Published - août 15 2017 |
Note bibliographique
Funding Information:1Institut für Physiologie und Pathophysiologie, Philipps-Universität Marburg, Marburg, Germany; 2Max-Planck-Institut für Experimentelle Medizin, Göttingen, Germany; 3Experimentelle und Klinische Pharmakologie und Toxikologie, Universität des Saarlandes, Homburg, Germany; 4Department of Neurophysiology, Center of Biomedicine and Medical Technology Mannheim, Medical Faculty Mannheim Heidelberg University, Mannheim, Germany; 5Institute of Physiology, Faculty of Medicine, University of Freiburg, Freiburg, Germany; 6Abteilung für Pharmakologie und Experimentelle Therapie, Institut für Experimentelle und Klinische Pharmakologie und Toxikologie, Universität Tübingen, Tübingen, Germany; 7Proteomics and Mass Spectrometry Core Facility, Life Sciences Research Institute, Dalhousie University, Halifax, Nova Scotia, Canada; 8Institut für Pharmakologie und Klinische Pharmazie, Philipps-Universität Marburg, Marburg, Germany; 9Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine, Peoria, United States
Publisher Copyright:
© Dembla et al.
ASJC Scopus Subject Areas
- General Neuroscience
- General Biochemistry,Genetics and Molecular Biology
- General Immunology and Microbiology