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Ni HD, Xu LS, Wang Y, Li H, An K, Liu M, Liu Q, Deng H, He Q, Huang B, Fang J, Yao M. Astrocyte activation in the periaqueductal gray promotes descending facilitation to cancer-induced bone pain through the JNK MAPK signaling pathway. Mol Pain 2019; 15:1744806919831909. [PMID: 30700204 PMCID: PMC6388461 DOI: 10.1177/1744806919831909] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Descending nociceptive modulation from the supraspinal structures has an important role in cancer-induced bone pain (CIBP). Midbrain ventrolateral periaqueductal gray (vlPAG) is a critical component of descending nociceptive circuits; nevertheless, its precise cellular and molecular mechanisms involved in descending facilitation remain elusive. Our previous study has shown that the activation of p38 MAPK in vlPAG microglia is essential for the neuropathic pain sensitization. However, the existence of potential connection between astrocytes and c-Jun N-terminal kinase (JNK) pathway in CIBP has not yet been elucidated. The following study examines the involvement of astrocyte activation and upregulation of p-JNK in vlPAG, using a CIBP rat model. Briefly, CIBP was mimicked by an intramedullary injection of Walker 256 mammary gland carcinoma cells into the animal tibia. A significant increase in expression levels of astrocytes in the vlPAG of CIBP rats was observed. Furthermore, stereotaxic microinjection of the astrocytic cytotoxin L-α-aminoadipic acid decreased the mechanical allodynia as well as established and reversed the astrocyte activation in CIBP rats. A significant increase in expression levels of p-JNK in astrocytes in vlPAG of CIBP rats was also observed. Moreover, the intrathecal administration of JNK inhibitors SP600125 reduced the expression of glial fibrillary acidic protein, while microinjection of the SP600125 decreased the mechanical allodynia of CIBP rats. These results suggested that CIBP is associated with astrocyte activation in the vlPAG that probably participates in driving descending pain facilitation through the JNK MAPK signaling pathway. To sum up, these findings reveal a novel site of astrocytes modulation of CIBP.
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Affiliation(s)
- Hua-Dong Ni
- 1 The Second Clinical Medical College, Zhejiang Chinese Medicine University, Hangzhou, China.,2 Department of Anesthesiology and Pain Research Center, The First Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Long Sheng Xu
- 2 Department of Anesthesiology and Pain Research Center, The First Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Yungong Wang
- 2 Department of Anesthesiology and Pain Research Center, The First Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Hongbo Li
- 2 Department of Anesthesiology and Pain Research Center, The First Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Kang An
- 3 Department of Anesthesiology, Bengbu Medical College, Bengbu, China
| | - Mingjuan Liu
- 2 Department of Anesthesiology and Pain Research Center, The First Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Qianying Liu
- 3 Department of Anesthesiology, Bengbu Medical College, Bengbu, China
| | - Houshen Deng
- 2 Department of Anesthesiology and Pain Research Center, The First Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Qiuli He
- 2 Department of Anesthesiology and Pain Research Center, The First Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Bing Huang
- 2 Department of Anesthesiology and Pain Research Center, The First Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Jianqiao Fang
- 1 The Second Clinical Medical College, Zhejiang Chinese Medicine University, Hangzhou, China
| | - Ming Yao
- 2 Department of Anesthesiology and Pain Research Center, The First Affiliated Hospital of Jiaxing University, Jiaxing, China
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Nasir H, Mahboubi H, Gyawali S, Ding S, Mickeviciute A, Ragavendran JV, Laferrière A, Stochaj U, Coderre TJ. Consistent sex-dependent effects of PKMζ gene ablation and pharmacological inhibition on the maintenance of referred pain. Mol Pain 2016; 12:1744806916675347. [PMID: 27899695 PMCID: PMC5131814 DOI: 10.1177/1744806916675347] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 09/06/2016] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Persistently active PKMζ has been implicated in maintaining spinal nociceptive sensitization that underlies pain hypersensitivity. However, evidence for PKMζ in the maintenance of pain hypersensitivity comes exclusively from short-term studies in males using pharmacological agents of questionable selectivity. The present study examines the contribution of PKMζ to long-lasting allodynia associated with neuropathic, inflammatory, or referred visceral and muscle pain in males and females using pharmacological inhibition or genetic ablation. RESULTS Pharmacological inhibition or genetic ablation of PKMζ reduced mild formalin pain and slowly developing contralateral allodynia in nerve-injured rats, but not moderate formalin pain or ipsilateral allodynia in models of neuropathic and inflammatory pain. Pharmacological inhibition or genetic ablation of PKMζ also effectively reduced referred visceral and muscle pain in male, but not in female mice and rats. CONCLUSION We show pharmacological inhibition and genetic ablation of PKMζ consistently attenuate long-lasting pain hypersensitivity. However, differential effects in models of referred versus inflammatory and neuropathic pain, and in males versus females, highlight the roles of afferent input-dependent masking and sex differences in the maintenance of pain hypersensitivity.
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Affiliation(s)
- Hibatulnaseer Nasir
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Department of Anesthesia, McGill University, Montreal, QC, Canada
- Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
| | - Hicham Mahboubi
- Department of Physiology, McGill University, Montreal, QC, Canada
| | - Sandeep Gyawali
- Division of Pharmacology & Toxicology, School of Pharmacy, University of Texas at Austin, Austin, TX, USA
| | - Stephanie Ding
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
| | - Aiste Mickeviciute
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
| | - J Vaigunda Ragavendran
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Department of Anesthesia, McGill University, Montreal, QC, Canada
| | - André Laferrière
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Department of Anesthesia, McGill University, Montreal, QC, Canada
| | - Ursula Stochaj
- Department of Physiology, McGill University, Montreal, QC, Canada
| | - Terence J Coderre
- Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Department of Anesthesia, McGill University, Montreal, QC, Canada
- Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
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Lu B, Jiang J, Sun J, Xiao C, Meng B, Zheng J, Li X, Wang R, Wu G, Chen J. Inhibition of mammalian target of rapamycin activation in the rostral anterior cingulate cortex attenuates pain-related aversion in rats. Behav Brain Res 2016; 310:51-8. [PMID: 27163752 DOI: 10.1016/j.bbr.2016.05.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Revised: 04/12/2016] [Accepted: 05/04/2016] [Indexed: 10/21/2022]
Abstract
Pain is a complex experience that comprises both sensory and affective dimensions. Mammalian target of rapamycin (mTOR) plays an important role in the modulation of neuronal plasticity associated with the pathogenesis of pain sensation. However, the role of mTOR in pain affect is unclear. Using a formalin-induced conditioned place avoidance (F-CPA) test, the current study investigated the effects of the mTOR specific inhibitor rapamycin on noxious stimulation induced aversion in the rostral anterior cingulate cortex (rACC). Intraplantar injection of 5% formalin was associated with significant activation of mTOR, as well as p70 ribosomal S6 protein (p70S6K), its downstream effector, in the rACC. The inhibition of mTOR activation with rapamycin disrupted pain-related aversion; however, this inhibition did not affect formalin-induced spontaneous nociceptive behaviors in rats. These findings demonstrated for the first time that mTOR and its downstream pathway in the rACC contribute to the induction of pain-related negative emotion.
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Affiliation(s)
- Bo Lu
- Department of Anesthesia, Ningbo NO. 2 Hospital, Ningbo 315010, PR China
| | - Jingyan Jiang
- Department of Anesthesia, Yinzhou Hospital Affiliated to Medical School of Ningbo University, Ningbo 315040, PR China
| | - Jianliang Sun
- Department of Anesthesia, Hangzhou Hospital Affiliated to Nanjing Medical University, Hangzhou First People's Hospital, Hangzhou 310006, PR China
| | - Chun Xiao
- Department of Anesthesia, Hangzhou Hospital Affiliated to Nanjing Medical University, Hangzhou First People's Hospital, Hangzhou 310006, PR China
| | - Bo Meng
- Department of Anesthesia, Ningbo NO. 2 Hospital, Ningbo 315010, PR China
| | - Jinwei Zheng
- Department of Anesthesia, Ningbo NO. 2 Hospital, Ningbo 315010, PR China
| | - Xiaoyu Li
- Department of Anesthesia, Ningbo NO. 2 Hospital, Ningbo 315010, PR China
| | - Ruichun Wang
- Department of Anesthesia, Ningbo NO. 2 Hospital, Ningbo 315010, PR China
| | - Guorong Wu
- Department of Anesthesia, Ningbo NO. 2 Hospital, Ningbo 315010, PR China
| | - Junping Chen
- Department of Anesthesia, Ningbo NO. 2 Hospital, Ningbo 315010, PR China.
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