Sinomenine facilitates the efficacy of gabapentin or ligustrazine hydrochloride in animal models of neuropathic pain.

Abstract

Management of chronic pain is restricted by the lack of effective tools. This study evaluated the efficacies of sinomenine combined gabapentin or ligustrazine hydrochloride in treating peripheral and central chronic neuropathic pain. The study was conducted in mice with photochemically induced sciatic nerve injury, and in rats with photochemically induced spinal cord injury. For assessing the effectiveness of combined therapy, sinomenine, gabapentin or ligustrazine hydrochloride was injected intraperitoneally (i.p.), and pain behavioral tests were performed. At sub-effective dosages, pre-administration of sinomenine (for 60 min) plus gabapentin or ligustrazine hydrochloride, generated significant anti-allodynic effects in mice or rats with peripheral or central neuropathic pain. However, these effects were abolished when gabapentin or ligustrazine hydrochloride was pre-administered, and then sinomenine was given 60 min later. The combined efficacies of sinomenine and gabapentin or ligustrazine hydrochloride, cannot be blocked or reversed by the naloxone, suggesting the underlying mechanism is not mediated by opioid receptors. Moreover, following repeated treatments, sinomenine and gabapentin combination increased the baseline mechanical threshold, while generating prolonged analgesia, without introducing notable side effects. Sinomenine can enhance the efficacy of gabapentin or ligustrazine hydrochloride in rodent models of peripheral or central neuropathic pain, without introducing tolerance or other notable side effects. Findings of current study suggest that combing sinomenine and gabapentin or ligustrazine hydrochloride could be highly beneficial in neuropathic pain therapies.

• Authors: Tianle Gao, Tiansheng Shi, Zsuzsanna Wiesenfeld-Hallin, Tao Li, Jian-Dong Jiang, Xiao-Jun Xu
• Journal: European journal of pharmacology (Eur J Pharmacol) Vol. 854 Pg. 101-108 (Jul 05 2019) ISSN: 1879-0712 [Electronic] Netherlands
• PMID: 30954565 (Publication Type: Journal Article)
• Copyright: Copyright © 2019 Elsevier B.V. All rights reserved.

Chemical References

• Analgesics
• Morphinans
• Pyrazines
• sinomenine
• Gabapentin
• tetramethylpyrazine

Topics

• Analgesics (pharmacology, therapeutic use)
• Animals
• Disease Models, Animal
• Drug Synergism
• Gabapentin (pharmacology, therapeutic use)
• Male
• Mice
• Mice, Inbred C57BL
• Morphinans (pharmacology)
• Neuralgia (drug therapy)
• Peripheral Nerve Injuries (drug therapy)
• Pyrazines (pharmacology, therapeutic use)
• Spinal Cord Injuries (drug therapy)