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Niu L, Zuo CJ, Zhang YL, Ma CX, Zhou XW, Sun SR, Tang XX, Huang GQ, Zhai SC. Oxidative stress mediated decrement of spinal endomorphin-2 contributes to lumbar disc herniation sciatica in rats. Neurochem Int 2024; 177:105764. [PMID: 38729355 DOI: 10.1016/j.neuint.2024.105764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Revised: 05/02/2024] [Accepted: 05/07/2024] [Indexed: 05/12/2024]
Abstract
Increasing evidence supported that oxidative stress induced by herniated lumbar disc played important role in the formation of lumbar disc herniation sciatica (LDHS), however, the neural mechanisms underlying LDHS need further clarification. Endomorphin-2 (EM2) is the endogenous ligand for mu-opioid receptor (MOR), and there is increasing evidence implicating the involvement of spinal EM2 in neuropathic pain. In this study, using an nucleus pulposus implantation induced LDHS rat model that displayed obvious mechanical allodynia, it was found that the expression of EM2 in dorsal root ganglion (DRG) and spinal cord was significantly decreased. It was further found that oxidative stress in DRG and spinal cord was significantly increased in LDHS rats, and the reduction of EM2 in DRG and spinal cord was determined by oxidative stress dominated increment of dipeptidylpeptidase IV activity. A systemic treatment with antioxidant could prevent the forming of mechanical allodynia in LDHS rats. In addition, MOR expression in DRG and spinal cord remained unchanged in LDHS rats. Intrathecal injection of MOR antagonist promoted pain behavior in LDHS rats, and the analgesic effect of intrathecal injection of EM2 was stronger than that of endomorphin-1 and morphine. Taken together, our findings suggest that oxidative stress mediated decrement of EM2 in DRG and spinal cord causes the loss of endogenous analgesic effects and enhances the pain sensation of LDHS.
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Affiliation(s)
- Le Niu
- Haojing College of Shaanxi University of Science&Technology, Unified Avenue, Xianyang, 712046, PR China; The Xi'an DaXing Hospital, 353 Laodong North Road, Xi'an, 710016, PR China.
| | - Chun-Jiang Zuo
- Haojing College of Shaanxi University of Science&Technology, Unified Avenue, Xianyang, 712046, PR China
| | - Yong-Ling Zhang
- Haojing College of Shaanxi University of Science&Technology, Unified Avenue, Xianyang, 712046, PR China
| | - Cui-Xia Ma
- Haojing College of Shaanxi University of Science&Technology, Unified Avenue, Xianyang, 712046, PR China
| | - Xiang-Wen Zhou
- Haojing College of Shaanxi University of Science&Technology, Unified Avenue, Xianyang, 712046, PR China
| | - Shi-Ru Sun
- Haojing College of Shaanxi University of Science&Technology, Unified Avenue, Xianyang, 712046, PR China
| | - Xue-Xue Tang
- Haojing College of Shaanxi University of Science&Technology, Unified Avenue, Xianyang, 712046, PR China
| | - Guo-Quan Huang
- Haojing College of Shaanxi University of Science&Technology, Unified Avenue, Xianyang, 712046, PR China
| | - Si-Cheng Zhai
- Haojing College of Shaanxi University of Science&Technology, Unified Avenue, Xianyang, 712046, PR China.
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2
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Huo Y, Cheng C, Wang S, Li L, Rong Z, Su C, Li F, Li Y, Yang L. A novel endomorphin-2/salmon calcitonin hybrid peptide with enhancing anti-allodynic and anti-anxiety effects. Peptides 2023; 170:171108. [PMID: 37778465 DOI: 10.1016/j.peptides.2023.171108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 09/28/2023] [Accepted: 09/29/2023] [Indexed: 10/03/2023]
Abstract
Pain, a worldwide problem with a high incidence and complex pathogenesis, has attracted the attention of pharmaceutical enterprises for the development of safer and more effective drugs. Extensive experimental and clinical evidence has demonstrated the analgesic effects of two endogenous peptides: endomorphin-2 (EM-2) and salmon calcitonin (sCT). However, EM-2 has limitations, such as poor ability to cross the blood-brain barrier (BBB) and little therapeutic effect in chronic pain due to rapid in vivo proteolysis. Herein, we propose the design of a novel hybrid peptide TEM2CT by combining EM-2, sCT16-21, and the cell-penetrating peptide HIV-1 trans-activator protein (TAT) with the aim of enhancing their analgesic effects. TEM2CT treatment attenuated nociceptive behavior in both acute and chronic pain mouse models, exhibiting increased anti-allodynic and anti-anxiety effects compared to sCT treatment. Furthermore, TEM2CT also regulated the excitability of pyramidal neurons in the anterior cingulate cortex (ACC) in spared nerve injury (SNI) model mice. The improved efficacy of this hybrid peptide provides a promising strategy for developing analgesic drugs.
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Affiliation(s)
- Yuhan Huo
- Department of Anatomy and K.K. Leung Brain Research Centre, Air Force Medical University, Xi'an 710032, Shaanxi, China; Student Brigade, School of Basic Medicine, Air Force Medical University, Xi'an 710032, Shaanxi, China
| | - Caiyan Cheng
- Institute of Medical Research, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China
| | - Saiying Wang
- Department of Pharmacy, Tangdu Hospital, Air Force Medical University, Xi'an 710038, Shaanxi, China
| | - Lin Li
- Institute of Medical Research, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China
| | - Zheng Rong
- Department of Pharmacy, Tangdu Hospital, Air Force Medical University, Xi'an 710038, Shaanxi, China
| | - Chang Su
- Department of Pharmacy, Tangdu Hospital, Air Force Medical University, Xi'an 710038, Shaanxi, China
| | - Fei Li
- Department of Anatomy and K.K. Leung Brain Research Centre, Air Force Medical University, Xi'an 710032, Shaanxi, China
| | - Yunqing Li
- Department of Anatomy and K.K. Leung Brain Research Centre, Air Force Medical University, Xi'an 710032, Shaanxi, China.
| | - Le Yang
- Department of Anatomy and K.K. Leung Brain Research Centre, Air Force Medical University, Xi'an 710032, Shaanxi, China; Department of Pharmacy, Tangdu Hospital, Air Force Medical University, Xi'an 710038, Shaanxi, China.
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3
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Fu J, Ni C, Ni H, Xu L, He Q, Pan H, Huang D, Sun Y, Luo G, Liu M, Yao M. Spinal Nrf2 translocation may inhibit neuronal NF-κB activation and alleviate allodynia in a rat model of bone cancer pain. J Neurochem 2021; 158:1110-1130. [PMID: 34254317 PMCID: PMC9292887 DOI: 10.1111/jnc.15468] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 03/23/2021] [Accepted: 07/02/2021] [Indexed: 01/11/2023]
Abstract
Bone cancer pain (BCP) is a clinical pathology that urgently needs to be solved, but research on the mechanism of BCP has so far achieved limited success. Nuclear factor erythroid 2 (NFE2)-related factor 2 (Nrf2) has been shown to be involved in pain, but its involvement in BCP and the specific mechanism have yet to be examined. This study aimed to test the hypothesis that BCP induces the transfer of Nrf2 from the cytoplasm to the nucleus and further promotes nuclear transcription to activate heme oxygenase-1 (HO-1) and inhibit the activation of nuclear factor-kappa B (NF-κB) signalling, ultimately regulating the neuroinflammatory response. Von-Frey was used for behavioural analysis in rats with BCP, whereas western blotting, real-time quantitative PCR (RT-PCR) and enzyme-linked immunosorbent assay (ELISA) were used to detect molecular expression changes, and immunofluorescence was used to detect cellular localization. We demonstrated that BCP induced increased Nrf2 nuclear protein expression with decreased cytoplasmic protein expression in the spinal cord. Further increases in Nrf2 nuclear protein expression can alleviate hyperalgesia and activate HO-1 to inhibit the expression of NF-κB nuclear protein and inflammatory factors. Strikingly, intrathecal administration of the corresponding siRNA reversed the above effects. In addition, the results of double immune labelling revealed that Nrf2 and NF-κB were coexpressed in spinal cord neurons of rats with BCP. In summary, these findings suggest that the entry of Nrf2 into the nucleus promotes the expression of HO-1, inhibiting activation of the NF-κB signalling pathway, reducing neuroinflammation and ultimately exerting an anti-nociceptive effect.
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Affiliation(s)
- Jie Fu
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
| | - Chaobo Ni
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
| | - Hua‐Dong Ni
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
| | - Long‐Sheng Xu
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
| | - Qiu‐Li He
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
| | - Huan Pan
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
| | - Dong‐Dong Huang
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
| | - Yan‐Bao Sun
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
| | - Ge Luo
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
| | - Ming‐Juan Liu
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
| | - Ming Yao
- Department of Anesthesiology and Pain Research CenterThe First Hospital of Jiaxing or The Affiliated Hospital of Jiaxing UniversityJiaxingChina
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Fu J, Xu M, Xu L, Ni H, Zhao B, Ni C, Huang M, Zhu J, Luo G, Yao M. Sulforaphane alleviates hyperalgesia and enhances analgesic potency of morphine in rats with cancer-induced bone pain. Eur J Pharmacol 2021; 909:174412. [PMID: 34375671 DOI: 10.1016/j.ejphar.2021.174412] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 07/22/2021] [Accepted: 08/06/2021] [Indexed: 01/15/2023]
Abstract
Due to the efficacy and tolerability of the available drugs, the current treatment for cancer-induced bone pain (CIBP) is not considered ideal, and new drugs are required for better treatment results. This study investigated whether intrathecal injection of sulforaphane (SFN) can modulates the noxious behavior associated with CIBP and enhances the analgesic effects of morphine and the possible mechanisms related to these effects were investigated. Walker256 breast cancer cells were injected into the bone marrow cavity of rats to establish the CIBP model. When CIBP rats began to exhibit painful behavior (CIBP 6 days), SFN was injected intrathecally for 7 days. The results showed that SFN alleviated the painful behavioral hypersensitivity caused by cancer, accompanied by nuclear factor, erythroid 2 like 2 (Nrf2), Haem oxygenase 1 (HO-1) activation, nuclear factor kappa B (NF-κB) inhibition and inflammation-related factors (tumor necrosis factor-alpha (TNF-α), interleukin-1β (IL-β), interleukin-6 (IL-6), and inducible nitric oxide synthase (iNOS) reduction. In addition, SFN treatment inhibited the proliferation of Walker 256 cells in a dose-dependent manner, promoted mu-opioid receptor (MOR) expression in SH-SY5Y cells and enhanced the antihyperalgesic effects of morphine on CIBP rats by restoring the downregulation of MOR expression in the spinal cord. Interestingly, the antihyperalgesic effects of SFN were partially blocked by opioid receptor antagonists. This study showed that SFN combined with morphine might be a new way to treat CIBP.
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Affiliation(s)
- Jie Fu
- Department of Anesthesiology and Pain Research Center, Affiliated Hospital of Jiaxing University & The First Hospital of Jiaxing, Jiaxing, China
| | - Miao Xu
- Department of Anesthesiology and Pain Research Center, Affiliated Hospital of Jiaxing University & The First Hospital of Jiaxing, Jiaxing, China
| | - Longsheng Xu
- Department of Anesthesiology and Pain Research Center, Affiliated Hospital of Jiaxing University & The First Hospital of Jiaxing, Jiaxing, China
| | - Huadong Ni
- Department of Anesthesiology and Pain Research Center, Affiliated Hospital of Jiaxing University & The First Hospital of Jiaxing, Jiaxing, China
| | - Baoxia Zhao
- Department of Anesthesiology and Pain Research Center, Affiliated Hospital of Jiaxing University & The First Hospital of Jiaxing, Jiaxing, China
| | - Chaobo Ni
- Department of Anesthesiology and Pain Research Center, Affiliated Hospital of Jiaxing University & The First Hospital of Jiaxing, Jiaxing, China
| | - Mingde Huang
- Department of Anesthesiology and Pain Research Center, Affiliated Hospital of Jiaxing University & The First Hospital of Jiaxing, Jiaxing, China
| | - Jianjun Zhu
- Department of Anesthesiology and Pain Research Center, Affiliated Hospital of Jiaxing University & The First Hospital of Jiaxing, Jiaxing, China
| | - Ge Luo
- Department of Anesthesiology and Pain Research Center, Affiliated Hospital of Jiaxing University & The First Hospital of Jiaxing, Jiaxing, China
| | - Ming Yao
- Department of Anesthesiology and Pain Research Center, Affiliated Hospital of Jiaxing University & The First Hospital of Jiaxing, Jiaxing, China.
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5
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Abstract
This paper is the fortieth consecutive installment of the annual anthological review of research concerning the endogenous opioid system, summarizing articles published during 2017 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides and receptors as well as effects of opioid/opiate agonists and antagonists. The review is subdivided into the following specific topics: molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors (1), the roles of these opioid peptides and receptors in pain and analgesia in animals (2) and humans (3), opioid-sensitive and opioid-insensitive effects of nonopioid analgesics (4), opioid peptide and receptor involvement in tolerance and dependence (5), stress and social status (6), learning and memory (7), eating and drinking (8), drug abuse and alcohol (9), sexual activity and hormones, pregnancy, development and endocrinology (10), mental illness and mood (11), seizures and neurologic disorders (12), electrical-related activity and neurophysiology (13), general activity and locomotion (14), gastrointestinal, renal and hepatic functions (15), cardiovascular responses (16), respiration and thermoregulation (17), and immunological responses (18).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, CUNY, 65-30 Kissena Blvd., Flushing, NY, 11367, United States.
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