I. Obara
Inhibition of the Mammalian Target of Rapamycin Complex 1 (mTORC1) signaling pathway reduces itch behaviour in mice
Obara, I.; Medrano, M.C.; Signoret-Genest, J.; Jiménez-Díaz, L.; Géranton, S.M.; Hunt, S.P.
Authors
M.C. Medrano
J. Signoret-Genest
L. Jiménez-Díaz
S.M. Géranton
S.P. Hunt
Abstract
Activated mammalian target of rapamycin (P-mTOR) has been shown to maintain the sensitivity of subsets of small-diameter primary afferent A-nociceptors. Local or systemic inhibition of the mTOR complex 1 (mTORC1) pathway reduced punctate mechanical and cold sensitivity in neuropathic pain and therefore offered a new approach to chronic pain control. In this study, we have investigated the effects of the rapamycin analog temsirolimus (CCI-779) on itch. Bouts of scratching induced by the histamine-dependent pruritogenic compound 48/80 and histamine-independent pruritogens, chloroquine and SLIGRL-NH2, injected intradermally were significantly reduced by local (intradermal) or systemic (intraperitoneal, i.p.) pretreatment with CCI-779. We also investigated the action of metformin, a drug taken to control type 2 diabetes and recently shown to inhibit mTORC1 in vivo. Although the response to nonhistaminergic stimuli was reduced at all of the time points tested, scratching to compound 48/80 was modified by metformin only when the drug was injected 24 hours before this pruritogen. We also examined the colocalization of P-mTOR with gastrin-releasing peptide, a putative marker for some itch-sensitive primary afferents, and found that P-mTOR was coexpressed in less than 5% of gastrin-releasing peptide–positive fibers in the mouse skin. Taken together, the data highlight the role that P-mTOR-positive A-fibers play in itch signaling and underline the importance of the mTORC1 pathway in the regulation of homeostatic primary afferent functions such as pain and itch. The actions of the antidiabetic drug metformin in ameliorating nonhistamine-mediated itch also suggest a new therapeutic route for the control of this category of pruritus.
Citation
Obara, I., Medrano, M., Signoret-Genest, J., Jiménez-Díaz, L., Géranton, S., & Hunt, S. (2015). Inhibition of the Mammalian Target of Rapamycin Complex 1 (mTORC1) signaling pathway reduces itch behaviour in mice. PAIN, 156(8), 1519-1529. https://doi.org/10.1097/j.pain.0000000000000197
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 10, 2015 |
Publication Date | Aug 1, 2015 |
Deposit Date | May 4, 2016 |
Publicly Available Date | May 4, 2016 |
Journal | PAIN |
Print ISSN | 0304-3959 |
Electronic ISSN | 1872-6623 |
Publisher | Lippincott, Williams & Wilkins |
Peer Reviewed | Peer Reviewed |
Volume | 156 |
Issue | 8 |
Pages | 1519-1529 |
DOI | https://doi.org/10.1097/j.pain.0000000000000197 |
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Copyright Statement
© 2015 International Association for the Study of Pain. This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially.
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