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ORL1 Activation Mediates a Novel ORL1 Receptor Agonist SCH221510 Analgesia in Neuropathic Pain in Rats

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Abstract

Opioid receptor like 1 (ORL1) receptor activation displayed an anti-nociceptive effect at spinal level for acute and neuropathic pain. SCH221510, an orally active non-peptide ORL1 agonist, was reported to be effective in treating neuropathic pain. The present study used ORL1 antagonist and siRNA to investigate that ORL1 activation mediates intrathecal SCH221510 analgesia in neuropathic pain induced by chronic constrictive injury (CCI) to rat sciatic nerve. Paw withdrawal latency and 50% mechanical threshold were measured for thermal and mechanical hypersensitivity in rats. CCI significantly decreased paw withdrawal latency and mechanical threshold. SCH221510 (3, 10, 30 μg) or ORL1 antagonist ([Nphe1]nociceptin(1-13)NH2, 10 μg) was intrathecally injected to test the behavioral effects on neuropathic pain. Intrathecal siRNA was started on 1 day before CCI surgery and maintained for 7 days. L4-L5 spinal cord ORL1 mRNA and protein were measured by real-time PCR and Western blot. The effect of intrathecal siRNA on SCH2210510 was tested in CCI rats on day 7. Intrathecal SCH221510 dose-dependently reduced thermal and mechanical hypersensitivity induced by CCI. [Nphe1]nociceptin(1-13)NH2 blocked SCH221510 analgesia in CCI rats. Intrathecal siRNA blocked ORL1 mRNA and protein increase induced by CCI. Intrathecal ORL1 siRNA did not change thermal and mechanical hypersensitivity induced by nerve injury. Intrathecal siRNA blocked SCH221510 analgesia in neuropathic pain at spinal level. Conclusively, ORL1 activation mediates SCH221510 analgesia in neuropathic pain at spinal level. The results warrant a potential clinically applicable drug in treating neuropathic pain.

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Abbreviations

ORL1 :

opioid receptor like 1

CCI:

chronic constrictive injury

N/OFQ:

nociceptin/orphanin FQ

PWL:

paw withdrawal latency

PB:

phosphate buffer

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Acknowledgements

Thanks Fei Liu for editing the manuscript.

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The authors will provide data upon request.

Funding

The study was funded by the Xinxiang Central Hospital Startup fund.

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Authors

Contributions

QW designed the experiment, carried out the study, and drafted the manuscript. LL carried out the experiments.

Corresponding author

Correspondence to Qiang Wu.

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The experiment was approved by the Animals Care and Use Committee of Luoyang Medical College.

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The authors have consent to publish the study.

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The authors declare that they have no competing interests.

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Wu, Q., Liu, L. ORL1 Activation Mediates a Novel ORL1 Receptor Agonist SCH221510 Analgesia in Neuropathic Pain in Rats. J Mol Neurosci 66, 10–16 (2018). https://doi.org/10.1007/s12031-018-1140-0

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  • DOI: https://doi.org/10.1007/s12031-018-1140-0

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