1
|
Fan H, Wu Z, Zhu D, Gu J, Xu M, Zhang M, Duan H, Li Y, Chen T. Proanthocyanidins Inhibit the Transmission of Spinal Pain Information Through a Presynaptic Mechanism in a Mouse Inflammatory Pain Model. Front Neurosci 2022; 15:804722. [PMID: 35185451 PMCID: PMC8850919 DOI: 10.3389/fnins.2021.804722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 12/31/2021] [Indexed: 11/13/2022] Open
Abstract
Inflammatory pain is one of the most common symptoms of clinical pain that seriously affects patient quality of life, but it currently has limited therapeutic options. Proanthocyanidins, a group of polyphenols enriched in plants and foods, have been reported to exert anti-inflammatory pain-alleviating effects. However, the mechanism by which proanthocyanidins relieve inflammatory pain in the central nervous system is unclear. In the present study, we observed that intrathecal injection of proanthocyanidins inhibited mechanical and thermal pain sensitivity in mice with inflammatory pain induced by Complete Freund’s Adjuvant (CFA) injection. Electrophysiological results further showed that proanthocyanidins inhibited the frequency of spontaneous excitatory postsynaptic currents without affecting the spontaneous inhibitory postsynaptic currents or the intrinsic properties of parabrachial nucleus-projecting neurons in the spinal cord. The effect of proanthocyanidins may be mediated by their inhibition of phosphorylated activation of the PI3K/Akt/mTOR pathway molecules in dorsal root ganglia neurons. In summary, intrathecal injection of procyanidin induces an obvious anti-inflammatory pain effect in mice by inhibiting peripheral excitatory inputs to spinal neurons that send nociceptive information to supraspinal areas.
Collapse
Affiliation(s)
- Hongwei Fan
- Department of Human Anatomy, Xuzhou Medical University, Xuzhou, China
- Department of Anatomy, Histology and Embryology, K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an, China
| | - Zhenyu Wu
- Department of Anatomy, Histology and Embryology, K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an, China
- Epilepsy Center of Xijing Hospital, Fourth Military Medical University, Xi’an, China
| | - DaYu Zhu
- Department of Human Anatomy, Xuzhou Medical University, Xuzhou, China
- Department of Anatomy, Histology and Embryology, K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an, China
| | - Junxiang Gu
- Department of Anatomy, Histology and Embryology, K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an, China
- Department of Neurosurgery, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China
| | - Mang Xu
- Department of Anatomy, Histology and Embryology, K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an, China
- Department of Anatomy, Basic Medical College, Dali University, Dali, China
| | - Mingzhe Zhang
- Department of Anatomy, Histology and Embryology, K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an, China
| | - Haokai Duan
- Department of Anatomy, Histology and Embryology, K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an, China
| | - Yunqing Li
- Department of Human Anatomy, Xuzhou Medical University, Xuzhou, China
- Department of Anatomy, Histology and Embryology, K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an, China
| | - Tao Chen
- Department of Human Anatomy, Xuzhou Medical University, Xuzhou, China
- Department of Anatomy, Histology and Embryology, K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an, China
- *Correspondence: Tao Chen,
| |
Collapse
|