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Luo R, Hu X, Li X, Lei F, Liao P, Yi L, Zhang X, Zhou B, Jiang R. Dysfunctional astrocyte glutamate uptake in the hypothalamic paraventricular nucleus contributes to visceral pain and anxiety-like behavior in mice with chronic pancreatitis. Glia 2024. [PMID: 39046219 DOI: 10.1002/glia.24595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 06/12/2024] [Accepted: 07/08/2024] [Indexed: 07/25/2024]
Abstract
Abdominal visceral pain is a predominant symptom in patients with chronic pancreatitis (CP); however, the underlying mechanism of pain in CP remains elusive. We hypothesized that astrocytes in the hypothalamic paraventricular nucleus (PVH) contribute to CP pain pathogenesis. A mouse model of CP was established by repeated intraperitoneal administration of caerulein to induce abdominal visceral pain. Abdominal mechanical stimulation, open field and elevated plus maze tests were performed to assess visceral pain and anxiety-like behavior. Fiber photometry, brain slice Ca2+ imaging, electrophysiology, and immunohistochemistry were used to investigate the underlying mechanisms. Mice with CP displayed long-term abdominal mechanical allodynia and comorbid anxiety, which was accompanied by astrocyte glial fibrillary acidic protein reactivity, elevated Ca2+ signaling, and astroglial glutamate transporter-1 (GLT-1) deficits in the PVH. Specifically, reducing astrocyte Ca2+ signaling in the PVH via chemogenetics significantly rescued GLT-1 deficits and alleviated mechanical allodynia and anxiety in mice with CP. Furthermore, we found that GLT-1 deficits directly contributed to the hyperexcitability of VGLUT2PVH neurons in mice with CP, and that pharmacological activation of GLT-1 alleviated the hyperexcitability of VGLUT2PVH neurons, abdominal visceral pain, and anxiety in these mice. Taken together, our data suggest that dysfunctional astrocyte glutamate uptake in the PVH contributes to visceral pain and anxiety in mice with CP, highlighting GLT-1 as a potential therapeutic target for chronic pain in patients experiencing CP.
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Affiliation(s)
- Rong Luo
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
- Laboratory of Anesthesia and Critical Care Medicine, National-Local Joint Engineering Research Center of Translational Medicine of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Xiaojun Hu
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
- Laboratory of Anesthesia and Critical Care Medicine, National-Local Joint Engineering Research Center of Translational Medicine of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Xin Li
- Laboratory of Anesthesia and Critical Care Medicine, National-Local Joint Engineering Research Center of Translational Medicine of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Fan Lei
- Laboratory of Anesthesia and Critical Care Medicine, National-Local Joint Engineering Research Center of Translational Medicine of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Ping Liao
- Laboratory of Anesthesia and Critical Care Medicine, National-Local Joint Engineering Research Center of Translational Medicine of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Limei Yi
- Laboratory of Anesthesia and Critical Care Medicine, National-Local Joint Engineering Research Center of Translational Medicine of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Xia Zhang
- Department of Neurology, West China Hospital of Sichuan University, Chengdu, China
| | - Bin Zhou
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
- Laboratory of Anesthesia and Critical Care Medicine, National-Local Joint Engineering Research Center of Translational Medicine of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Ruotian Jiang
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
- Laboratory of Anesthesia and Critical Care Medicine, National-Local Joint Engineering Research Center of Translational Medicine of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
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Gao W, Wang Z, Wang H, Li H, Huang C, Shen Y, Ma X, Sun H. Neurons and Astrocytes in Ventrolateral Periaqueductal Gray Contribute to Restraint Water Immersion Stress-Induced Gastric Mucosal Damage via the ERK1/2 Signaling Pathway. Int J Neuropsychopharmacol 2021; 24:666-676. [PMID: 34000028 PMCID: PMC8378083 DOI: 10.1093/ijnp/pyab028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 03/15/2021] [Accepted: 05/12/2021] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND The restraint water immersion stress (RWIS) model includes both psychological and physical stimulation, which may lead to gastrointestinal disorders and cause gastric mucosal damage. The ventrolateral periaqueductal gray (VLPAG) contributes to gastrointestinal function, but whether it is involved in RWIS-induced gastric mucosal damage has not yet been reported. METHODS The expression of glial fibrillary acidic protein, neuronal c-Fos, and phosphorylated extracellular signal regulated kinase 1/2 in the VLPAG after RWIS was assessed using western blotting and immunocytochemical staining methods. Lateral ventricle injection of astrocytic toxin L-a-aminoadipate and treatment with extracellular signal-regulated kinase (ERK)1/2 signaling pathway inhibitor PD98059 were further used to study protein expression and distribution in the VLPAG after RWIS. RESULTS The expression of c-Fos, glial fibrillary acidic protein, and phosphorylated extracellular signal regulated kinase 1/2 in the VLPAG significantly increased following RWIS and peaked at 1 hour after RWIS. Lateral ventricle injection of the astrocytic toxin L-a-aminoadipate significantly alleviated gastric mucosal injury and decreased the activation of neurons and astrocytes. Treatment with the ERK1/2 signaling pathway inhibitor PD98059 obviously suppressed gastric mucosal damage as well as the RWIS-induced activation of neurons and astrocytes in the VLPAG. CONCLUSIONS These results suggested that activation of VLPAG neurons and astrocytes induced by RWIS through the ERK1/2 signaling pathway may play a critical role in RWIS-induced gastric mucosa damage.
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Affiliation(s)
- Wenting Gao
- Key Laboratory of Animal Resistance Biology of Shandong Province, College of Life Science, Shandong Normal University, Jinan, China
| | - Zepeng Wang
- Key Laboratory of Animal Resistance Biology of Shandong Province, College of Life Science, Shandong Normal University, Jinan, China
| | - Hui Wang
- Key Laboratory of Animal Resistance Biology of Shandong Province, College of Life Science, Shandong Normal University, Jinan, China
| | - Huimin Li
- Key Laboratory of Animal Resistance Biology of Shandong Province, College of Life Science, Shandong Normal University, Jinan, China
| | - Chenxu Huang
- Key Laboratory of Animal Resistance Biology of Shandong Province, College of Life Science, Shandong Normal University, Jinan, China
| | - Yangyang Shen
- Key Laboratory of Animal Resistance Biology of Shandong Province, College of Life Science, Shandong Normal University, Jinan, China
| | - Xiaoli Ma
- Research Center of Basic Medicine, Jinan Central Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China,Correspondence: Xiaoli Ma, PhD, Jinan Central Hospital, Cheeloo College of Medicine, Shandong University ()
| | - Haiji Sun
- Key Laboratory of Animal Resistance Biology of Shandong Province, College of Life Science, Shandong Normal University, Jinan, China,Haiji Sun, PhD, College of Life Science, Shandong Normal University ()
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Bai Y, Chen YB, Qiu XT, Chen YB, Ma LT, Li YQ, Sun HK, Zhang MM, Zhang T, Chen T, Fan BY, Li H, Li YQ. Nucleus tractus solitarius mediates hyperalgesia induced by chronic pancreatitis in rats. World J Gastroenterol 2019; 25:6077-6093. [PMID: 31686764 PMCID: PMC6824279 DOI: 10.3748/wjg.v25.i40.6077] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 09/06/2019] [Accepted: 09/10/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Central sensitization plays a pivotal role in the maintenance of chronic pain induced by chronic pancreatitis (CP). We hypothesized that the nucleus tractus solitarius (NTS), a primary central site that integrates pancreatic afferents apart from the thoracic spinal dorsal horn, plays a key role in the pathogenesis of visceral hypersensitivity in a rat model of CP.
AIM To investigate the role of the NTS in the visceral hypersensitivity induced by chronic pancreatitis.
METHODS CP was induced by the intraductal injection of trinitrobenzene sulfonic acid (TNBS) in rats. Pancreatic hyperalgesia was assessed by referred somatic pain via von Frey filament assay. Neural activation of the NTS was indicated by immunohistochemical staining for Fos. Basic synaptic transmission within the NTS was assessed by electrophysiological recordings. Expression of vesicular glutamate transporters (VGluTs), N-methyl-D-aspartate receptor subtype 2B (NR2B), and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor subtype 1 (GluR1) was analyzed by immunoblotting. Membrane insertion of NR2B and GluR1 was evaluated by electron microscopy. The regulatory role of the NTS in visceral hypersensitivity was detected via pharmacological approach and chemogenetics in CP rats.
RESULTS TNBS treatment significantly increased the number of Fos-expressing neurons within the caudal NTS. The excitatory synaptic transmission was substantially potentiated within the caudal NTS in CP rats (frequency: 5.87 ± 1.12 Hz in CP rats vs 2.55 ± 0.44 Hz in sham rats, P < 0.01; amplitude: 19.60 ± 1.39 pA in CP rats vs 14.71 ± 1.07 pA in sham rats; P < 0.01). CP rats showed upregulated expression of VGluT2, and increased phosphorylation and postsynaptic trafficking of NR2B and GluR1 within the caudal NTS. Blocking excitatory synaptic transmission via the AMPAR antagonist CNQX and the NMDAR antagonist AP-5 microinjection reversed visceral hypersensitivity in CP rats (abdominal withdraw threshold: 7.00 ± 1.02 g in CNQX group, 8.00 ± 0.81 g in AP-5 group and 1.10 ± 0.27 g in saline group, P < 0.001). Inhibiting the excitability of NTS neurons via chemogenetics also significantly attenuated pancreatic hyperalgesia (abdominal withdraw threshold: 13.67 ± 2.55 g in Gi group, 2.00 ± 1.37 g in Gq group, and 2.36 ± 0.67 g in mCherry group, P < 0.01).
CONCLUSION Our findings suggest that enhanced excitatory transmission within the caudal NTS contributes to pancreatic pain and emphasize the NTS as a pivotal hub for the processing of pancreatic afferents, which provide novel insights into the central sensitization of painful CP.
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Affiliation(s)
- Yang Bai
- Department of Anatomy, Histology and Embryology & K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
| | - Ying-Biao Chen
- Department of Anatomy, Fujian Health College, Fuzhou 350101, Fujian Province, China
| | - Xin-Tong Qiu
- Department of Anatomy, Histology and Embryology & K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
| | - Yan-Bing Chen
- Department of Anatomy, Histology and Embryology & K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
| | - Li-Tian Ma
- Department of Anatomy, Histology and Embryology & K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
| | - Ying-Qi Li
- Department of Cardiology, The Second Affiliated Hospital of Xian Jiaotong University, Xian Jiaotong University, Xi'an 710004, Shaanxi Province, China
| | - Hong-Ke Sun
- Department of Cardiology, The Second Affiliated Hospital of Xian Jiaotong University, Xian Jiaotong University, Xi'an 710004, Shaanxi Province, China
| | - Ming-Ming Zhang
- Department of Anatomy, Histology and Embryology & K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
| | - Ting Zhang
- Department of Anatomy, Histology and Embryology & K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
| | - Tao Chen
- Department of Anatomy, Histology and Embryology & K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
| | - Bo-Yuan Fan
- Department of Cardiology, The Second Affiliated Hospital of Xian Jiaotong University, Xian Jiaotong University, Xi'an 710004, Shaanxi Province, China
| | - Hui Li
- Department of Anatomy, Histology and Embryology & K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
| | - Yun-Qing Li
- Department of Anatomy, Histology and Embryology & K. K. Leung Brain Research Centre, Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
- Joint Laboratory of Neuroscience at Hainan Medical University and Fourth Military Medical University, Hainan Medical University, Haikou 571199, Hainan Province, China
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Dodds KN, Beckett EAH, Evans SF, Hutchinson MR. Spinal Glial Adaptations Occur in a Minimally Invasive Mouse Model of Endometriosis: Potential Implications for Lesion Etiology and Persistent Pelvic Pain. Reprod Sci 2018; 26:357-369. [PMID: 29730970 DOI: 10.1177/1933719118773405] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Glial adaptations within the central nervous system are well known to modulate central sensitization and pain. Recently, it has been suggested that activity of glial-related proinflammatory cytokines may potentiate peripheral inflammation, via central neurogenic processes. However, a role for altered glial function has not yet been investigated in the context of endometriosis, a chronic inflammatory condition in women associated with peripheral lesions, often manifesting with persistent pelvic pain. Using a minimally invasive mouse model of endometriosis, we investigated associations between peripheral endometriosis-like lesions and adaptations in central glial reactivity. Spinal cords (T13-S1) from female C57BL/6 mice with endometriosis-like lesions (ENDO) were imaged via fluorescent immunohistochemistry for the expression of glial fibrillary acidic protein (GFAP; astrocytes) and CD11b (microglia) in the dorsal horn (n = 5). Heightened variability ( P = .02) as well as an overall increase ( P = .04) in the mean area of GFAP immunoreactivity was found in ENDO versus saline-injected control animals. Interestingly, spinal levels showing the greatest alterations in GFAP immunoreactivity appeared to correlate with the spatial location of lesions within the abdominopelvic cavity. A subtle but significant increase in the mean area of CD11b immunostaining was also observed in ENDO mice compared to controls ( P = .02). This is the first study to describe adaptations in nonneuronal, immune-like cells of the central nervous system attributed to the presence of endometriosis-like lesions.
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Affiliation(s)
- Kelsi N Dodds
- 1 Discipline of Physiology, Adelaide Medical School, University of Adelaide, Adelaide, South Australia, Australia
| | - Elizabeth A H Beckett
- 1 Discipline of Physiology, Adelaide Medical School, University of Adelaide, Adelaide, South Australia, Australia
| | - Susan F Evans
- 2 Discipline of Pharmacology, Adelaide Medical School, University of Adelaide, Adelaide, South Australia, Australia
| | - Mark R Hutchinson
- 1 Discipline of Physiology, Adelaide Medical School, University of Adelaide, Adelaide, South Australia, Australia.,3 Australian Research Council Centre of Excellence for Nanoscale BioPhotonics, University of Adelaide, Adelaide, South Australia, Australia
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Fan F, Li L, Liu W, Yang M, Ma X, Sun H. Astrocytes and neurons in locus coeruleus mediate restraint water immersion stress-induced gastric mucosal damage through the ERK1/2 signaling pathway. Neurosci Lett 2018; 675:95-102. [PMID: 29580882 DOI: 10.1016/j.neulet.2018.03.054] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Revised: 03/20/2018] [Accepted: 03/22/2018] [Indexed: 02/06/2023]
Abstract
Restraint water-immersion stress (RWIS) is considered to be a compound stress model that includes psychological and physical stimulation and may cause gastric mucosal damage. Studies have shown that locus coeruleus (LC) is involved in the gastrointestinal function, but whether it is involved in RWIS-induced gastric mucosal damage has not yet been reported. Here, we investigated the expression of glial fibrillary acidic protein (GFAP), c-Fos, and phosphorylation extracellular signal regulated kinase 1/2 (p-ERK1/2) in the LC after RWIS using immunocytochemical staining and western blotting in order to explore whether the ERK1/2 signaling pathway interacts with the neuron-astrocyte network in the LC during RWIS and whether it is involved in causing RWIS-induced gastric mucosal damage. Expression of c-Fos, GFAP, and p-ERK1/2 increased significantly following RWIS and peaked at 3 h after RWIS. After intracerebroventricular injection of c-Fos antisense oligodeoxynucleotides (ASO) and astrocytic toxin L-a-aminoadipate (L-AA), the gastric mucosal damage and the activation of neurons and astrocytes in the LC significantly decreased. Intracerebroventricular injection of ERK1/2 signaling pathway inhibitor PD98059 suppressed gastric mucosal damage as well as the RWIS-induced activation of neurons and astrocytes in the LC. Activation of LC neurons and astrocytes induced by RWIS through the ERK1/2 signaling pathway may play a critical role in RWIS-induced gastric mucosa damage.
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Affiliation(s)
- Fangcheng Fan
- Key Laboratory of Animal Resistance Biology of Shandong Province, School of Life Science, Shandong Normal University, Jinan, 250014, China
| | - Lei Li
- Key Laboratory of Animal Resistance Biology of Shandong Province, School of Life Science, Shandong Normal University, Jinan, 250014, China
| | - Wenkai Liu
- Key Laboratory of Animal Resistance Biology of Shandong Province, School of Life Science, Shandong Normal University, Jinan, 250014, China
| | - Mengzhu Yang
- Qingdao No.31 Middle School, Qingdao, 266041, China
| | - Xiaoli Ma
- Central Laboratory, Jinan Central Hospital Affiliated to Shandong University, Jinan, 250100, China.
| | - Haiji Sun
- Key Laboratory of Animal Resistance Biology of Shandong Province, School of Life Science, Shandong Normal University, Jinan, 250014, China.
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Drewes AM, Bouwense SAW, Campbell CM, Ceyhan GO, Delhaye M, Demir IE, Garg PK, van Goor H, Halloran C, Isaji S, Neoptolemos JP, Olesen SS, Palermo T, Pasricha PJ, Sheel A, Shimosegawa T, Szigethy E, Whitcomb DC, Yadav D. Guidelines for the understanding and management of pain in chronic pancreatitis. Pancreatology 2017; 17:720-731. [PMID: 28734722 DOI: 10.1016/j.pan.2017.07.006] [Citation(s) in RCA: 167] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 06/26/2017] [Accepted: 07/11/2017] [Indexed: 12/11/2022]
Abstract
Abdominal pain is the foremost complication of chronic pancreatitis (CP). Pain can be related to recurrent or chronic inflammation, local complications or neurogenic mechanisms with corresponding changes in the nervous systems. Both pain intensity and the frequency of pain attacks have been shown to reduce quality of life in patients with CP. Assessment of pain follows the guidelines for other types of chronic pain, where the multidimensional nature of symptom presentation is taken into consideration. Quantitative sensory testing may be used to characterize pain, but is currently used in a research setting in advanced laboratories. For pain relief, current guidelines recommend a simple stepwise escalation of analgesic drugs with increasing potency until pain relief is obtained. Abstinence from alcohol and smoking should be strongly advised. Pancreatic enzyme therapy and antioxidants may be helpful as initial treatment. Endoscopic treatment can be used in patients with evidence of ductal obstruction and may be combined with extracorporeal shock wave lithothripsy. The best candidates are those with distal obstruction of the main pancreatic duct and in early stage of disease. Behavioral interventions should be part of the multidisciplinary approach to chronic pain management particularly when psychological impact is experienced. Surgery should be considered early and after a maximum of five endoscopic interventions. The type of surgery depends on morphological changes of the pancreas. Long-term effects are variable, but high success rates have been reported in open studies and when compared with endoscopic treatment. Finally, neurolytical interventions and neuromodulation can be considered in difficult patients.
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Affiliation(s)
- Asbjørn M Drewes
- Centre for Pancreatic Diseases, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Denmark.
| | - Stefan A W Bouwense
- Department of Surgery, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Claudia M Campbell
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, USA
| | - Güralp O Ceyhan
- Department of Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Myriam Delhaye
- Department of Gastroenterology, Erasme University Hospital, Brussels, Belgium
| | - Ihsan Ekin Demir
- Department of Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Pramod K Garg
- Department of Gastroenterology, All India Institute of Medical Sciences, New Delhi, India
| | - Harry van Goor
- Department of Surgery, Radboud University Medical Center, Nijmegen, The Netherlands
| | | | - Shuiji Isaji
- Department of Surgery, Mie University Graduate School of Medicine, Japan
| | - John P Neoptolemos
- Institute of Translational Medicine, University of Liverpool, United Kingdom
| | - Søren S Olesen
- Centre for Pancreatic Diseases, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Denmark
| | - Tonya Palermo
- Seattle Children's Hospital Research Institute, Washington School of Medicine, USA
| | - Pankaj Jay Pasricha
- Center for Neurogastroenterology, Johns Hopkins University School of Medicine, Baltimore, USA
| | - Andrea Sheel
- Institute of Translational Medicine, University of Liverpool, United Kingdom
| | - Tooru Shimosegawa
- Department of Gastroenterology, Tohoku University Graduate School of Medicine, Japan
| | - Eva Szigethy
- Visceral Inflammation and Pain Center, Division of Gastroenterology, University of Pittsburgh and UPMC, Pittsburgh, PA, USA
| | - David C Whitcomb
- Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh and UPMC, Pittsburgh, PA, USA
| | - Dhiraj Yadav
- Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh and UPMC, Pittsburgh, PA, USA
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Luo D, Chen L, Yu B. Inhibition of the high affinity choline transporter enhances hyperalgesia in a rat model of chronic pancreatitis. Biochem Biophys Res Commun 2017; 488:204-210. [DOI: 10.1016/j.bbrc.2017.05.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Accepted: 05/05/2017] [Indexed: 12/19/2022]
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Interactions between astrocytes and neurons in the brainstem involved in restraint water immersion stress-induced gastric mucosal damage. Neuroreport 2016; 27:151-9. [PMID: 26720891 DOI: 10.1097/wnr.0000000000000515] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Restraint water-immersion stress (RWIS) is considered a compound stress model as it includes both psychological and physical stimulation. Studies have shown that neurons are involved in RWIS, but the role of astrocytes in RWIS has not been reported as yet. Here, we tested our hypothesis that astrocytes are involved in RWIS and interact with neurons in the brainstem to regulate gastric mucosal damage induced by RWIS. RWIS of different durations (0.5, 1, 2, 3, and 5 h) induced significant gastric mucosal damage and activated astrocytes by increasing the expression of glial fibrillary acidic protein and neurons, as indicated by the Fos expression in the nucleus of solitary tract and the dorsal motor nucleus of the vagus. Intracerebroventricular administration of both astroglial toxin L-α-aminoadipate and c-fos antisense oligodeoxy nucleotides reduced RWIS-induced gastric mucosal damage. Immunohistochemistry results showed that L-α-aminoadipate decreased the activation of both astrocytes and neurons by RWIS. Similarly, antisense oligodeoxy nucleotides significantly suppressed activation of both neurons and astrocytes induced by RWIS. Our data showed that astrocytic and neuronal activations may be closely related to the gastric mucosal damage induced by RWIS through reciprocal 'crosstalk'. This study suggests that an intervention targeting this interaction may offer some novel therapeutic strategies for gastric ulcers.
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Liu B, Su M, Tang S, Zhou X, Zhan H, Yang F, Li W, Li T, Xie J. Spinal astrocytic activation contributes to mechanical allodynia in a rat model of cyclophosphamide-induced cystitis. Mol Pain 2016; 12:12/0/1744806916674479. [PMID: 27852964 PMCID: PMC5117243 DOI: 10.1177/1744806916674479] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 07/29/2016] [Accepted: 08/24/2016] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Previous studies have demonstrated that glial cells play an important role in the generation and maintenance of neuropathic pain. Activated glial cells produce numerous mediators such as proinflammatory cytokines that facilitate neuronal activity and synaptic plasticity. Similarly, bladder pain syndrome/interstitial cystitis shares many characteristics of neuropathic pain. However, related report on the involvement of spinal glia in bladder pain syndrome/interstitial cystitis-associated pathological pain and the underlying mechanisms are still lacking. The present study investigated spinal glial activation and underlying molecular mechanisms in a rat model of bladder pain syndrome/interstitial cystitis. RESULTS A rat model of bladder pain syndrome/interstitial cystitis was established via systemic injection with cyclophosphamide. Mechanical allodynia was tested with von Frey monofilaments and up-down method. Moreover, Western blots and double immunofluorescence were used to detect the expression and location of glial fibrillary acidic protein, OX42/Iba1, P-P38, NeuN, interleukin (IL)-1β, phosphorylation of N-methyl-D-aspartate receptor 1 (P-NR1), and IL-1 receptor I (IL-1RI) in the L6-S1 spinal cord. We found that glial fibrillary acidic protein rather than OX42/Iba1 or P-P38 was significantly increased in the spinal cord of cyclophosphamide-induced cystitis. L-alpha-aminoadipate but not minocycline markedly attenuated the allodynia. Furthermore, we found that spinal IL-1β was dramatically increased in cyclophosphamide-induced cystitis, and activated astrocytes were the only source of IL-1β release, which contributed to allodynia in cystitis rats. Besides, spinal P-NR1 was statistically increased in cyclophosphamide-induced cystitis and only localized in IL-1RI positive neurons in spinal dorsal horn. Additionally, NR antagonist significantly attenuated the cystitis-induced pain. Interestingly, the time course of the P-NR1 expression paralleled to that of IL-1β or glial fibrillary acidic protein. CONCLUSIONS Our results demonstrated that astrocytic activation but not microglial activation contributed to the allodynia in cyclophosphamide-induced cystitis and IL-1β released from astrocytes might bind to its endogenous receptor on the neurons inducing the phosphorylation of NR1 subunit, leading to sensory neuronal hyperexcitability and pathological pain.
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Affiliation(s)
- Bolong Liu
- Department of Urology, The Third Affiliated Hospital and Lingnan Hospital of the Sun Yat-Sen University, Guangzhou, China
| | - Minzhi Su
- Department of Rehabilitation, The Third Affiliated Hospital·and Lingnan Hospital of the Sun Yat-Sen University, Guangzhou, China
| | - ShaoJun Tang
- Department of Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, TX, USA
| | - Xiangfu Zhou
- Department of Urology, The Third Affiliated Hospital and Lingnan Hospital of the Sun Yat-Sen University, Guangzhou, China
| | - Hailun Zhan
- Department of Urology, The Third Affiliated Hospital and Lingnan Hospital of the Sun Yat-Sen University, Guangzhou, China
| | - Fei Yang
- Department of Urology, The Third Affiliated Hospital and Lingnan Hospital of the Sun Yat-Sen University, Guangzhou, China
| | - Wenbiao Li
- Department of Urology, The Third Affiliated Hospital and Lingnan Hospital of the Sun Yat-Sen University, Guangzhou, China
| | - Tengcheng Li
- Department of Urology, The Third Affiliated Hospital and Lingnan Hospital of the Sun Yat-Sen University, Guangzhou, China
| | - Juncong Xie
- Department of Urology, The Third Affiliated Hospital and Lingnan Hospital of the Sun Yat-Sen University, Guangzhou, China
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Sun H, Li R, Xu S, Liu Z, Ma X. Hypothalamic Astrocytes Respond to Gastric Mucosal Damage Induced by Restraint Water-Immersion Stress in Rat. Front Behav Neurosci 2016; 10:210. [PMID: 27847472 PMCID: PMC5088369 DOI: 10.3389/fnbeh.2016.00210] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 10/17/2016] [Indexed: 12/20/2022] Open
Abstract
Restraint water-immersion stress (RWIS), a compound stress model, includes both psychological and physical stimulation. Studies have shown that neurons in the hypothalamus are involved in RWIS, but the role of astrocytes and the interactions between astrocytes and neurons in RWIS are not clear. Here, we tested our hypothesis that hypothalamus astrocytes are involved in RWIS and interact with neurons to regulate gastric mucosal damage induced by RWIS. The expression of Glial fibrillary acidic protein (GFAP) and c-Fos in the paraventricular nucleus (PVN) and supraoptic nucleus (SON) significantly increased following the RWIS. GFAP and c-Fos expression are similar in the temporal pattern, peaked at 1 h after the RWIS, then reduced gradually, and reached a maximal level again at 5 h which show “double-peak” characteristics. Intracerebroventricular administration of astroglial toxin L-a-aminoadipate (L-AA) and c-Fos antisense oligodeoxy nucleotides (ASO) both decreased RWIS-induced gastric mucosal damage. Results of immunohistochemistry assay revealed that both L-AA and ASO decreased the activation of astrocytes and neurons in the hypothalamus by RWIS. These results showed that hypothalamus neuron-astrocyte “network” involved in gastric mucosal damage induced by RWIS. This study may offer theoretical basis for some novel therapeutic strategies for RWIS-induced gastric ulcers.
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Affiliation(s)
- Haiji Sun
- College of Life Science, Shandong Normal University Jinan, China
| | - Ruisheng Li
- Research Center for Clinical and Translational Medicine, 302 Hospital of PLA Beijing, China
| | - Shiguo Xu
- College of Life Science, Shandong Normal University Jinan, China
| | - Zhen Liu
- College of Life Science, Shandong Normal University Jinan, China
| | - Xiaoli Ma
- Central Laboratory, Jinan Central Hospital Affiliated to Shandong University Jinan, China
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Wang LL, Shi DL, Gu HY, Zheng MZ, Hu J, Song XH, Shen YL, Chen YY. Resveratrol attenuates inflammatory hyperalgesia by inhibiting glial activation in mice spinal cords. Mol Med Rep 2016; 13:4051-7. [PMID: 27035673 DOI: 10.3892/mmr.2016.5027] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 03/04/2016] [Indexed: 11/06/2022] Open
Abstract
The present study aimed to investigate the effect of resveratrol on inflammatory pain. Mice were injected intraperitoneally with lipopolysaccharide (LPS) for 5 consecutive days to induce subacute systemic inflammation. Acetic acid‑induced writhing tests and tail‑flick tests were performed following the final LPS injection. Glial fibrillary acidic protein (GFAP; an astrocyte‑specific activation marker), ionized calcium binding adapter molecule 1 (Iba‑1; a microglia‑specific activation marker) and sirtuin 1 (SIRT1) protein expression levels were detected using immunohistochemistry analysis or western blotting. Following administration of LPS for 5 days, the number of writhes increased and the tail‑flick latency decreased. Resveratrol (10 or 20 mg/kg) partly inhibited LPS‑induced hyperalgesia and prevented the increase in tumor necrosis factor‑α and interleukin 6 levels induced by LPS. LPS injection reduced the SIRT1 protein expression and increased the number of GFAP‑positive and Iba‑1‑positive cells in the spinal cord. Resveratrol increased the SIRT1 protein expression levels and decreased the number of GFAP‑positive and Iba‑1‑positive cells in LPS‑treated mice. The protective effect of resveratrol was partly blocked by a selective SIRT1 inhibitor, EX‑257. Results from the present study suggest that subacute treatment with LPS induced the activation of glial cells and hyperalgesia. Resveratrol was demonstrated to inhibit the activation of glial cells and attenuate inflammatory hyperalgesia in a SIRT1‑dependent manner.
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Affiliation(s)
- Lin-Lin Wang
- Department of Physiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
| | - Dong-Ling Shi
- Department of Physiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
| | - Hui-Yao Gu
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
| | - Ming-Zhi Zheng
- Department of Pharmacology, Zhejiang Medical College, Hangzhou, Zhejiang 310053, P.R. China
| | - Jue Hu
- Department of Pharmacology, Zhejiang Medical College, Hangzhou, Zhejiang 310053, P.R. China
| | - Xing-Hui Song
- Core Facilities, Department of Basic Medical Sciences, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
| | - Yue-Liang Shen
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
| | - Ying-Ying Chen
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, P.R. China
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Anderson MA, Akshintala V, Albers KM, Amann ST, Belfer I, Brand R, Chari S, Cote G, Davis BM, Frulloni L, Gelrud A, Guda N, Humar A, Liddle RA, Slivka A, Gupta RS, Szigethy E, Talluri J, Wassef W, Wilcox CM, Windsor J, Yadav D, Whitcomb DC. Mechanism, assessment and management of pain in chronic pancreatitis: Recommendations of a multidisciplinary study group. Pancreatology 2016; 16:83-94. [PMID: 26620965 PMCID: PMC4761301 DOI: 10.1016/j.pan.2015.10.015] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 10/29/2015] [Accepted: 10/31/2015] [Indexed: 12/11/2022]
Abstract
DESCRIPTION Pain in patients with chronic pancreatitis (CP) remains the primary clinical complaint and source of poor quality of life. However, clear guidance on evaluation and treatment is lacking. METHODS Pancreatic Pain working groups reviewed information on pain mechanisms, clinical pain assessment and pain treatment in CP. Levels of evidence were assigned using the Oxford system, and consensus was based on GRADE. A consensus meeting was held during PancreasFest 2012 with substantial post-meeting discussion, debate, and manuscript refinement. RESULTS Twelve discussion questions and proposed guidance statements were presented. Conference participates concluded: Disease Mechanism: Pain etiology is multifactorial, but data are lacking to effectively link symptoms with pathologic feature and molecular subtypes. Assessment of Pain: Pain should be assessed at each clinical visit, but evidence to support an optimal approach to assessing pain character, frequency and severity is lacking. MANAGEMENT There was general agreement on the roles for endoscopic and surgical therapies, but less agreement on optimal patient selection for medical, psychological, endoscopic, surgical and other therapies. CONCLUSIONS Progress is occurring in pain biology and treatment options, but pain in patients with CP remains a major problem that is inadequately understood, measured and managed. The growing body of information needs to be translated into more effective clinical care.
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Affiliation(s)
| | | | - Kathryn M Albers
- Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA, USA
| | | | - Inna Belfer
- Department of Anesthesiology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Randall Brand
- Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Suresh Chari
- Department of Medicine, Mayo Clinic, Rochester, MN, USA
| | - Greg Cote
- Department of Medicine, Medical University of South Carolina, Charleston, SC, USA
| | - Brian M Davis
- Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Luca Frulloni
- Department of Medicine, University of Verona, Verona, Italy
| | - Andres Gelrud
- Department of Medicine, University of Chicago, Chicago, IL, USA
| | - Nalini Guda
- Department of Gastroenterology, Aurora St. Luke's Medical Center, Milwaukee, WI, USA
| | - Abhinav Humar
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA, USA
| | | | - Adam Slivka
- Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | | | - Eva Szigethy
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Jyothsna Talluri
- Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Wahid Wassef
- Department of Medicine, University of Massachusetts, Worcester, MA, USA
| | - C Mel Wilcox
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - John Windsor
- Department of Surgery, University of Auckland, Auckland, New Zealand
| | - Dhiraj Yadav
- Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - David C Whitcomb
- Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Cell Biology & Molecular Physiology, University of Pittsburgh, Pittsburgh, PA, USA; Department of Human Genetics, University of Pittsburgh, Pittsburgh, PA, USA.
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Abstract
PURPOSE OF REVIEW Pain is the most common symptom of chronic pancreatitis, with a profound socioeconomic impact. Historical management paradigms failed, as they did not adequately address the fundamental underlying mechanisms. The present article describes the neurobiology of pain and sensitization in this condition, in an effort to explain prior failings and provide future directions for managing pain in chronic pancreatitis. RECENT FINDINGS A number of recent advances have been made in understanding the neurobiology of pain for this condition. This has been coupled with clinical advances in assessing sensitization to pain in these patients, which has been shown to predict response to medical and surgical therapy. SUMMARY Pain in chronic pancreatitis is complex. Addressing the mechanical and morphological findings in chronic pancreatitis without addressing the underlying neurobiological mechanisms is destined to fail. New advances in our understanding of the neurobiology of pain in chronic pancreatitis helps to explain prior failings and provides future direction for managing pain in patients afflicted by this disease.
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Abdelaziz DM, Stone LS, Komarova SV. Localized experimental bone metastasis drives osteolysis and sensory hypersensitivity at distant non-tumor-bearing sites. Breast Cancer Res Treat 2015. [PMID: 26208488 DOI: 10.1007/s10549-015-3517-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Patients with breast cancer metastasis to bone suffer from inadequate pain relief. Animal models provide increased understanding of cancer-induced bone and sensory alterations. The objective of this study was to investigate the measures of pain at distant non-tumor-bearing sites in animals with localized bone metastasis. Immunocompetent BALB/c mice are injected intra-tibially with murine mammary carcinoma cells (4T1) or saline, and the sensitivity to mechanical and thermal stimuli in the contralateral paw was examined. In addition to previously demonstrated development of osteolysis and hypersensitivity to mechanical and thermal stimuli in the cancer-injected tibia, these animals exhibited an increase in sensory hypersensitivity in the contralateral limb. No bone lesions were evident on radiographs of the contralateral limbs. Histomorphometry detected decreased bone volume per tissue volume and increased osteoclast number in the contralateral tibia and vertebral bones of cancer-bearing animals. Neuroplasticity was examined by immunofluorescence for calcitonin gene-related peptide (CGRP) in sensory neurons and glial fibrillary acidic protein (GFAP) in lumbar spinal cords. CGRP-immunoreactivity and GFAP-immunoreactivity were significantly elevated both ipsilateral and contralateral in tumor-bearing animals. The anti-inflammatory and osteolysis-targeting drug rapamycin reduced hypersensitivity to mechanical and cold stimuli, attenuated GFAP over-expression, and lowered osteoclast number. The osteoclast-targeting drug pamidronate reduced sensitivity to cold and protected against bone loss. Localized bone cancer drives hypersensitivity, bone remodeling, and sensory neuron plasticity at sites distant from the primary tumor area. Drugs targeting these mechanisms may be useful in the treatment of pain distant from the primary tumor site.
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Astroglia-Microglia Cross Talk during Neurodegeneration in the Rat Hippocampus. BIOMED RESEARCH INTERNATIONAL 2015; 2015:102419. [PMID: 25977914 PMCID: PMC4419226 DOI: 10.1155/2015/102419] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 01/16/2015] [Accepted: 03/09/2015] [Indexed: 01/30/2023]
Abstract
Brain injury triggers a progressive inflammatory response supported by a dynamic astroglia-microglia interplay. We investigated the progressive chronic features of the astroglia-microglia cross talk in the perspective of neuronal effects in a rat model of hippocampal excitotoxic injury. N-Methyl-D-aspartate (NMDA) injection triggered a process characterized within 38 days by atrophy, neuronal loss, and fast astroglia-mediated S100B increase. Microglia reaction varied with the lesion progression. It presented a peak of tumor necrosis factor-α (TNF-α) secretion at one day after the lesion, and a transient YM1 secretion within the first three days. Microglial glucocorticoid receptor expression increased up to day 5, before returning progressively to sham values. To further investigate the astroglia role in the microglia reaction, we performed concomitant transient astroglia ablation with L-α-aminoadipate and NMDA-induced lesion. We observed a striking maintenance of neuronal death associated with enhanced microglial reaction and proliferation, increased YM1 concentration, and decreased TNF-α secretion and glucocorticoid receptor expression. S100B reactivity only increased after astroglia recovery. Our results argue for an initial neuroprotective microglial reaction, with a direct astroglial control of the microglial cytotoxic response. We propose the recovery of the astroglia-microglia cross talk as a tissue priority conducted to ensure a proper cellular coordination that retails brain damage.
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16
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Cao FL, Xu M, Wang Y, Gong KR, Zhang JT. Tanshinone IIA attenuates neuropathic pain via inhibiting glial activation and immune response. Pharmacol Biochem Behav 2015; 128:1-7. [DOI: 10.1016/j.pbb.2014.11.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 10/26/2014] [Accepted: 11/01/2014] [Indexed: 01/05/2023]
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17
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Ji XT, Qian NS, Zhang T, Li JM, Li XK, Wang P, Zhao DS, Huang G, Zhang L, Fei Z, Jia D, Niu L. Spinal astrocytic activation contributes to mechanical allodynia in a rat chemotherapy-induced neuropathic pain model. PLoS One 2013; 8:e60733. [PMID: 23585846 PMCID: PMC3621957 DOI: 10.1371/journal.pone.0060733] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2012] [Accepted: 03/01/2013] [Indexed: 12/29/2022] Open
Abstract
Chemotherapy-induced neuropathic pain (CNP) is the major dose-limiting factor in cancer chemotherapy. However, the neural mechanisms underlying CNP remain enigmatic. Accumulating evidence implicates the involvement of spinal glia in some neuropathic pain models. In this study, using a vincristine-evoked CNP rat model with obvious mechanical allodynia, we found that spinal astrocyte rather than microglia was dramatically activated. The mechanical allodynia was dose-dependently attenuated by intrathecal administratration of L-α-aminoadipate (astrocytic specific inhibitor); whereas minocycline (microglial specific inhibitor) had no such effect, indicating that spinal astrocytic activation contributes to allodynia in CNP rat. Furthermore, oxidative stress mediated the development of spinal astrocytic activation, and activated astrocytes dramatically increased interleukin-1β expression which induced N-methyl-D-aspartic acid receptor (NMDAR) phosphorylation in spinal neurons to strengthen pain transmission. Taken together, our findings suggest that spinal activated astrocytes may be a crucial component of the pathophysiology of CNP and “Astrocyte-Cytokine-NMDAR-neuron” pathway may be one detailed neural mechanisms underlying CNP. Thus, inhibiting spinal astrocytic activation may represent a novel therapeutic strategy for treating CNP.
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Affiliation(s)
- Xi-Tuan Ji
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Nian-Song Qian
- Department of Hepatobiliary Surgery, PLA General Hospital, Beijing, People’s Republic of China
| | - Tao Zhang
- Department of Orthopaedics, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, People’s Republic of China
| | - Jin-Mao Li
- Department of General Surgery, Tangdu Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Xin-Kui Li
- Department of Orthopaedics, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Peng Wang
- Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Dong-Sheng Zhao
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Gang Huang
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Lei Zhang
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Zhou Fei
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
- * E-mail: (LN); (DJ); (ZF)
| | - Dong Jia
- Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
- * E-mail: (LN); (DJ); (ZF)
| | - Le Niu
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
- School of Basic Medical Sciences, Fourth Military Medical University, Xi’an, People’s Republic of China
- * E-mail: (LN); (DJ); (ZF)
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Neural plasticity in the gastrointestinal tract: chronic inflammation, neurotrophic signals, and hypersensitivity. Acta Neuropathol 2013; 125:491-509. [PMID: 23417735 DOI: 10.1007/s00401-013-1099-4] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 01/31/2013] [Accepted: 02/07/2013] [Indexed: 12/28/2022]
Abstract
Neural plasticity is not only the adaptive response of the central nervous system to learning, structural damage or sensory deprivation, but also an increasingly recognized common feature of the gastrointestinal (GI) nervous system during pathological states. Indeed, nearly all chronic GI disorders exhibit a disease-stage-dependent, structural and functional neuroplasticity. At structural level, GI neuroplasticity usually comprises local tissue hyperinnervation (neural sprouting, neural, and ganglionic hypertrophy) next to hypoinnervated areas, a switch in the neurochemical (neurotransmitter/neuropeptide) code toward preferential expression of neuropeptides which are frequently present in nociceptive neurons (e.g., substance P/SP, calcitonin-gene-related-peptide/CGRP) and of ion channels (TRPV1, TRPA1, PAR2), and concomitant activation of peripheral neural glia. The functional counterpart of these structural alterations is altered neuronal electric activity, leading to organ dysfunction (e.g., impaired motility and secretion), together with reduced sensory thresholds, resulting in hypersensitivity and pain. The present review underlines that neural plasticity in all GI organs, starting from esophagus, stomach, small and large intestine to liver, gallbladder, and pancreas, actually exhibits common phenotypes and mechanisms. Careful appraisal of these GI neuroplastic alterations reveals that--no matter which etiology, i.e., inflammatory, infectious, neoplastic/malignant, or degenerative--neural plasticity in the GI tract primarily occurs in the presence of chronic tissue- and neuro-inflammation. It seems that studying the abundant trophic and activating signals which are generated during this neuro-immune-crosstalk represents the key to understand the remarkable neuroplasticity of the GI tract.
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Demir IE, Wang K, Tieftrunk E, Giese NA, Xing B, Friess H, Kehl T, Ceyhan GO. Neuronal plasticity in chronic pancreatitis is mediated via the neurturin/GFRα2 axis. Am J Physiol Gastrointest Liver Physiol 2012; 303:G1017-28. [PMID: 22961804 DOI: 10.1152/ajpgi.00517.2011] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The glial cell line-derived neurotrophic factor (GDNF) family member neurturin (NRTN) and its receptor GFRα2 play a deciding role in the normal development of pancreatic parasympathetic innervation. In this study, we aimed at investigating the role of NRTN/GFRα2 axis in pancreatic neuropathy in human chronic pancreatitis (CP). Expression of NRTN/GFRα2 was compared between normal human pancreas (NP) and CP tissues via immunohistochemistry, immunoblotting, and quantitative RT-PCR and correlated to abdominal pain sensation. To elucidate the impact of NRTN in pancreatic neuroplasticity, neuronal phenotype and glial density were quantified via an in vitro neuroplasticity assay in dissociated newborn rat dorsal root ganglia (DRG) cultured 1) in CP tissue extracts depleted from NRTN, 2) in NP, 3) in untreated CP tissue extracts, and 4) CP extracts in which nerve growth factor, glial cell derived-neurotrophic factor, or TGF-β(1) was depleted. NRTN and GFRα2 were highly upregulated in CP, especially in intrapancreatic nerves and the extracellular matrix. CP tissue demonstrated increased amounts of mature multimeric NRTN and elevated levels of GFRα2. The noticeable neurotrophic effect of CP tissue extracts on DRG neurons was diminished upon blockade of NRTN from these extracts. However, blockade of NRTN from CP extracts did not influence the density of DRG glia cells. In conclusion, the NRTN/GFRα2 axis is activated during the course of CP and represents a major key player in the reactive neural alterations in CP. This is the first study to provide functional evidence for the contribution of neurotrophic factors to neuroplasticity in CP.
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Affiliation(s)
- Ihsan Ekin Demir
- Department of Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
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Quan-Xin F, Fan F, Xiang-Ying F, Shu-Jun L, Shi-Qi W, Zhao-Xu L, Xu-Jie Z, Qing-Chuan Z, Wei W. Resolvin D1 reverses chronic pancreatitis-induced mechanical allodynia, phosphorylation of NMDA receptors, and cytokines expression in the thoracic spinal dorsal horn. BMC Gastroenterol 2012; 12:148. [PMID: 23092159 PMCID: PMC3531273 DOI: 10.1186/1471-230x-12-148] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Accepted: 10/10/2012] [Indexed: 02/07/2023] Open
Abstract
Background We previously reported that immune activation in the spinal dorsal horn contributes to pain induced by chronic pancreatitis (CP). Targeting immune response in the CNS may provide effective treatments for CP-induced pain. Recent findings demonstrate that resolvin D1 (RvD1) can potently dampen inflammatory pain. We hypothesized that intrathecal injection of RvD1 may inhibit pain of CP. Methods Rat CP model was built through intrapancreatic infusion of trinitrobenzene sulfonic acid (TNBS). All the rats were divided into three groups: TNBS, sham, and naïve controls and were further divided for intrathecal RvD1 administration. Pain behavior of rats was tested with von Frey filaments. Anxiety-like behavior and free locomotor and exploration of rats were evaluated by open field test and elevated plus maze. Pancreatic histology was evaluated with hematoxylin and eosin staining. Phosphorylation of NMDA receptor and expression of inflammatory cytokines were examined with Western blot, real-time RT-PCR and ELISA. Results Behavioral study indicated that compared to the vehicle control, RvD1 (100 ng/kg) significantly decreased TNBS-induced mechanical allodynia at 2 h after administration (response frequencies: 49.2 ± 3.7% vs 71.3 ± 6.1%), and this effect was dose-dependent. Neither CP nor RvD1 treatment could affect anxiety-like behavior. CP or RvD1 treatment could not affect free locomotor and exploration of rats. Western blot analysis showed that compared with that of naïve group, phosphorylated NR1 (pNR1) and pNR2B in TNBS rats were significantly increased in the spinal cord (pNR1: 3.87±0.31 folds of naïve control, pNR2B: 4.17 ± 0.24 folds of naïve control). Compared to vehicle control, 10 ng/kg of RvD1 could significantly block expressions of pNR1 (2.21 ± 0.26 folds of naïve) and pNR2B (3.31 ± 0.34 folds of naïve). Real-time RT-PCR and ELISA data showed that RvD1 (10 ng/kg) but not vehicle could significantly block expressions of TNF-alpha, IL-1beta and IL-6. In addition, RvD1 did not influence pain behavior, NMDA receptor phosphorylation or cytokines production in sham-operated rats. Conclusions These data highly suggest that RvD1 could be a novel and effective treatment for CP-induced chronic pain.
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Affiliation(s)
- Feng Quan-Xin
- Xijing Hospital of Digestive Diseases, the Fourth Military Medical University, No, 127 West Changle Road, Xi'an, 710032, China
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21
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Imoto A, Mitsunaga S, Inagaki M, Aoyagi K, Sasaki H, Ikeda M, Nakachi K, Higuchi K, Ochiai A. Neural invasion induces cachexia via astrocytic activation of neural route in pancreatic cancer. Int J Cancer 2012; 131:2795-807. [PMID: 22511317 DOI: 10.1002/ijc.27594] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Accepted: 03/13/2012] [Indexed: 12/21/2022]
Abstract
Pancreatic cancer is characterized by a high frequency of cachexia, pain and neural invasion (N-inv). Neural damage is occurred by N-inv and modulates pain and muscle atrophy via the activation of astrocyte in the connected spine. The activated astrocyte by N-inv, thus, may affect cachexia in pancreatic cancer. Clinical studies in patients and autopsy cases with pancreatic cancer have revealed that N-inv is related to cachexia and astrocytic activation. We established a novel murine model of cancer cachexia using N-inv of human pancreatic cancer cells. Mice with N-inv showed a loss of body weight, skeletal muscle and fat mass without appetite loss, which are compatible with an animal model of cancer cachexia. Activation of astrocytes in the spinal cord connected with N-inv was observed in our model. Experimental cachexia was suppressed by disrupting neural routes or inhibiting the activation of astrocytes. These data provide the first evidence that N-inv induces cachexia via astrocytic activation of neural route in pancreatic cancer.
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Affiliation(s)
- Akira Imoto
- Pathology Division, Research Center for Innovative Oncology, National Cancer Center Hospital East, Kashiwa, Chiba, Japan
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22
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Garrison SR, Stucky CL. The dynamic TRPA1 channel: a suitable pharmacological pain target? Curr Pharm Biotechnol 2012; 12:1689-97. [PMID: 21466445 DOI: 10.2174/138920111798357302] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2010] [Accepted: 07/02/2010] [Indexed: 01/13/2023]
Abstract
Acute pain detection is vital to navigate and survive in one's environment. Protection and preservation occur because primary afferent nociceptors transduce adverse environmental stimuli into electrical impulses that are transmitted to and interpreted within high levels of the central nervous system. Therefore, it is critical that the molecular mechanisms that convert noxious information into neural signals be identified, and their specific functional roles delineated in both acute and chronic pain settings. The Transient Receptor Potential (TRP) channel family member TRP ankyrin 1 (TRPA1) is an excellent candidate molecule to explore and intricately understand how single channel properties can tailor behavioral nociceptive responses. TRPA1 appears to dynamically respond to an amazingly wide range of diverse stimuli that include apparently unrelated modalities such as mechanical, chemical and thermal stimuli that activate somatosensory neurons. How such dissimilar stimuli activate TRPA1, yet result in modality-specific signals to the CNS is unclear. Furthermore, TRPA1 is also involved in persistent to chronic painful states such as inflammation, neuropathic pain, diabetes, fibromyalgia, bronchitis and emphysema. Yet how TRPA1's role changes from an acute sensor of physical stimuli to its contribution to these diseases that are concomitant with implacable, chronic pain is unknown. TRPA1's involvement in the nociceptive machinery that relays the adverse stimuli during painful disease states is of considerable interest for drug delivery and design by many pharmaceutical entities. In this review, we will assess the current knowledge base of TRPA1 in acute nociception and persistent inflammatory pain states, and explore its potential as a therapeutic pharmacological target in chronic pervasive conditions such neuropathic pain, persistent inflammation and diabetes.
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Affiliation(s)
- Sheldon R Garrison
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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Abstract
Chronic pancreatitis is typically a painful condition and it can be associated with a severe burden of disease. The pathogenesis of pain in this disorder is poorly understood and its treatment has been largely empirical, often consisting of surgical or other invasive methods, with an outcome that is variable and frequently unsatisfactory. Human and experimental studies have indicated a critical role for neuronal mechanisms that result in peripheral and central sensitization. The pancreatic nociceptor seems to be significantly affected in this condition, with increased excitability associated with downregulation of potassium currents. Some of the specific molecules implicated in this process include the vanilloid receptor, TRPV1, nerve growth factor, the protease activated receptor 2 and a variety of others that are discussed in this Review. Studies have also indicated novel therapeutic targets for this condition.
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Affiliation(s)
- Pankaj Jay Pasricha
- Stanford University School of Medicine, 300 Pasteur Drive, M211 Alway Building, Stanford, CA 94305, USA.
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Zhu Y, Mehta K, Li C, Xu GY, Liu L, Colak T, Shenoy M, Pasricha PJ. Systemic administration of anti-NGF increases A-type potassium currents and decreases pancreatic nociceptor excitability in a rat model of chronic pancreatitis. Am J Physiol Gastrointest Liver Physiol 2012; 302:G176-81. [PMID: 22038828 PMCID: PMC3345962 DOI: 10.1152/ajpgi.00053.2011] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We have previously shown that pancreatic sensory neurons in rats with chronic pancreatitis (CP) display increased excitability associated with a decrease in transient inactivating potassium currents (I(A)), thus accounting in part for the hyperalgesia associated with this condition. Because of its well known role in somatic hyperalgesia, we hypothesized a role for the nerve growth factor (NGF) in driving these changes. CP was induced by intraductal injection of trinitrobenzene sulfonic acid (TNBS) in rats. After 3 wk, anti-NGF antibody or control serum was injected intra-peritoneally daily for 1 wk. This protocol was repeated in another set of experiments in control rats (receiving intraductal PBS instead of TNBS). Pancreatic nociceptors labeled with the dye Dil were identified, and patch-clamp recordings were made from acutely dissociated DRG neurons. Sensory neurons from anti-NGF-treated rats displayed a lower resting membrane potential, increased rheobase, decreased burst discharges in response to stimulatory current, and decreased input resistance compared with those treated with control serum. Under voltage-clamp condition, neuronal I(A) density was increased in anti-NGF-treated rats compared with rats treated with control serum. However, anti-NGF treatment had no effect on electrophysiological parameters in neurons from control rats. The expression of Kv-associated channel or ancillary genes Kv1.4, 4.1, 4.2, 4.3, and DPP6, DPP10, and KCHIPs 1-4 in pancreas-specific nociceptors was examined by laser-capture microdissection and real-time PCR quantification of mRNA levels. No significant differences were seen among those. These findings emphasize a key role for NGF in maintaining neuronal excitability in CP specifically via downregulation of I(A) by as yet unknown mechanisms.
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Affiliation(s)
- Yaohui Zhu
- 1Department of Medicine, Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, California; and
| | - Kshama Mehta
- 1Department of Medicine, Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, California; and
| | - Cuiping Li
- 1Department of Medicine, Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, California; and
| | - Guang-Yin Xu
- 2Department of Internal Medicine, University of Texas Medical Branch, Galveston, Texas
| | - Liansheng Liu
- 1Department of Medicine, Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, California; and
| | - Tugba Colak
- 1Department of Medicine, Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, California; and
| | - Mohan Shenoy
- 1Department of Medicine, Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, California; and
| | - Pankaj Jay Pasricha
- 1Department of Medicine, Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, California; and
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Tang Y, Liao Y, Kawaguchi-Sakita N, Raut V, Fakhrejahani E, Qian N, Toi M. Sinisan, a traditional Chinese medicine, attenuates experimental chronic pancreatitis induced by trinitrobenzene sulfonic acid in rats. JOURNAL OF HEPATO-BILIARY-PANCREATIC SCIENCES 2011; 18:551-8. [PMID: 21234610 DOI: 10.1007/s00534-010-0368-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND/PURPOSE Sinisan, a traditional Chinese medicine, is effective for the treatment of gastrointestinal disorders. In this study, we investigated the potential protective role of Sinisan against chronic pancreatitis (CP) in rats. METHODS CP was induced in rats by intrapancreatic injection of trinitrobenzene sulfonic acid (TNBS). Rats were randomly divided into a sham group, a TNBS-induced CP group and a Sinisan-treated group. Serum amylase and histological score were used to evaluate the severity of disease. The levels of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), cyclooxygenase-2 (COX-2), interleukin-10 (IL-10) and α-smooth muscle actin (α-SMA) were also measured in the three groups. Mechanical allodynia was measured with von Frey filaments. In addition, the protein levels of nerve growth factor (NGF) were measured in pancreatic tissues. RESULTS Administration of Sinisan significantly decreased the severity of CP. In the Sinisan-treated group, serum amylase, TNF-α, IL-1β, COX-2 and α-SMA levels were lower and the level of IL-10 was upregulated compared with the TNBS-induced CP group. Furthermore, treatment with Sinisan significantly, though not completely, attenuated the allodynia. Simultaneously NGF expression was also significantly downregulated in the Sinisan-treated group compared with the TNBS-induced CP group. CONCLUSIONS Sinisan could be an effective treatment modality for CP via its anti-inflammatory, anti-fibrotic and analgesic properties. It may be a promising drug candidate for the treatment of patients with CP.
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Affiliation(s)
- Yu Tang
- Department of Medical Image Center, Chinese PLA 302 Hospital, Beijing, China
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Neuronal NR2B-containing NMDA receptor mediates spinal astrocytic c-Jun N-terminal kinase activation in a rat model of neuropathic pain. Brain Behav Immun 2011; 25:1355-66. [PMID: 21496481 DOI: 10.1016/j.bbi.2011.04.002] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2010] [Revised: 03/22/2011] [Accepted: 04/02/2011] [Indexed: 12/19/2022] Open
Abstract
Spinal N-methyl d-aspartate receptor (NMDAR) plays a pivotal role in nerve injury-induced central sensitization. Recent studies suggest that NMDAR also contributes to neuron-astrocyte signaling. c-Jun N-terminal kinase (JNK) is persistently and specifically activated (indicated by phosphorylation) in spinal cord astrocytes after nerve injury and thus it is considered as a dependable indicator of pain-related astrocytic activation. NMDAR-mediated JNK activation in spinal dorsal horn might be an important form of neuron-astrocyte signaling in neuropathic pain. In the present study, we observed that intrathecal injection of MK-801, a noncompetitive NMDA receptor antagonist, or Ro25-6981 and ifenprodil, which are selective antagonists of NR2B-containing NMDAR each significantly reduced nerve injury-induced JNK activation. Double immunostaining showed that NR2B was highly expressed in neurons, indicating the effect of NMDAR antagonists on JNK activation was indirect. We further observed that intrathecal injection of NMDA (twice a day for 3 days) significantly increased spinal JNK phosphorylation. Besides, NMDAR-related JNK activation could be blocked by a neuronal nitric oxide synthase (nNOS) selective inhibitor (7-nitroindazole sodium salt) but not by a nNOS sensitive guanylyl cyclase inhibitor (1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one). Finally, real-time RT-PCR and immunostaining showed that nerve injury-induced interleukin-1beta expression was dependent on astrocytic JNK activation. Treatments targeting NMDAR-nNOS pathway also influenced interleukin-1beta expression, which further confirmed our hypothesis. Taken together, our results suggest that neuronal NMDAR-nNOS pathway could activate astrocytic JNK pathway. Excitatory neuronal transmission initiates astrocytic activation-induced neuroinflammation in this way, which contributes to nerve injury-induced neuropathic pain.
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Zhang GH, Lv MM, Wang S, Chen L, Qian NS, Tang Y, Zhang XD, Ren PC, Gao CJ, Sun XD, Xu LX. Spinal astrocytic activation is involved in a virally-induced rat model of neuropathic pain. PLoS One 2011; 6:e23059. [PMID: 21969850 PMCID: PMC3182161 DOI: 10.1371/journal.pone.0023059] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Accepted: 07/11/2011] [Indexed: 12/31/2022] Open
Abstract
Postherpetic neuralgia (PHN), the most common complication of herpes zoster (HZ), plays a major role in decreased life quality of HZ patients. However, the neural mechanisms underlying PHN remain unclear. Here, using a PHN rat model at 2 weeks after varicella zoster virus infection, we found that spinal astrocytes were dramatically activated. The mechanical allodynia and spinal central sensitization were significantly attenuated by intrathecally injected L-α-aminoadipate (astrocytic specific inhibitor) whereas minocycline (microglial specific inhibitor) had no effect, which indicated that spinal astrocyte but not microglia contributed to the chronic pain in PHN rat. Further study was taken to investigate the molecular mechanism of astrocyte-incudced allodynia in PHN rat at post-infection 2 weeks. Results showed that nitric oxide (NO) produced by inducible nitric oxide synthase mediated the development of spinal astrocytic activation, and activated astrocytes dramatically increased interleukin-1β expression which induced N-methyl-D-aspartic acid receptor (NMDAR) phosphorylation in spinal dorsal horn neurons to strengthen pain transmission. Taken together, these results suggest that spinal activated astrocytes may be one of the most important factors in the pathophysiology of PHN and “NO-Astrocyte-Cytokine-NMDAR-Neuron” pathway may be the detailed neural mechanisms underlying PHN. Thus, inhibiting spinal astrocytic activation may represent a novel therapeutic strategy for clinical management of PHN.
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Affiliation(s)
- Gui-He Zhang
- Department of Anesthesiology, Tangdu Hospital, The Fourth Military Medical University, Xi'an, People's Republic of China
- Department of Anesthesiology, School of Stomatology, The Fourth Military Medical University, Xi'an, People's Republic of China
| | - Miao-Miao Lv
- Department of Anesthesiology, School of Stomatology, The Fourth Military Medical University, Xi'an, People's Republic of China
| | - Shuang Wang
- Central Laboratory, The Fourth Military Medical University, Xi'an, People's Republic of China
| | - Lei Chen
- Department of Gynecology and Obstetrics, Naval General Hospital, Beijing, People's Republic of China
| | - Nian-Song Qian
- Department of Hepatobiliary Surgery, PLA General Hospital, Beijing, People's Republic of China
| | - Yu Tang
- Department of Ultrasound, PLA 302 Hospital, Beijing, People's Republic of China
| | - Xu-Dong Zhang
- Department of Orthopaedics, Tangdu Hospital, The Fourth Military Medical University, Xi'an, People's Republic of China
| | - Peng-Cheng Ren
- Department of Orthopaedics, Tangdu Hospital, The Fourth Military Medical University, Xi'an, People's Republic of China
| | - Chang-Jun Gao
- Department of Anesthesiology, Tangdu Hospital, The Fourth Military Medical University, Xi'an, People's Republic of China
- * E-mail: (C-JG) (CG); (X-DS) (XS); (L-XX) (LX)
| | - Xu-De Sun
- Department of Anesthesiology, Tangdu Hospital, The Fourth Military Medical University, Xi'an, People's Republic of China
- * E-mail: (C-JG) (CG); (X-DS) (XS); (L-XX) (LX)
| | - Li-Xian Xu
- Department of Anesthesiology, School of Stomatology, The Fourth Military Medical University, Xi'an, People's Republic of China
- * E-mail: (C-JG) (CG); (X-DS) (XS); (L-XX) (LX)
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Abstract
PURPOSE OF REVIEW We review important new clinical observations in chronic pancreatitis made in the past year. RECENT FINDINGS Tropical pancreatitis associates with SPINK1 and/or CFTR gene mutations in approximately 50% of patients, similar to the frequency in idiopathic chronic pancreatitis. Corticosteroids increase secretin-stimulated pancreatic bicarbonate concentrations in autoimmune pancreatitis (AIP) by restoring mislocalized CFTR protein to the apical ductal membrane. Most patients with asymptomatic hyperenzymemia have pancreatic lesions of unclear significance or no pancreatic lesions. Common pitfalls in the use of diagnostic tests for exocrine pancreatic insufficiency (EPI) confound interpretation of findings in irritable bowel syndrome and severe renal insufficiency. Further study is needed to improve the accuracy of endoscopic ultrasonography (EUS) to diagnose chronic pancreatitis. Celiac plexus block provides short-term pain relief in a subset of patients. SUMMARY Results of this year's investigations further elucidated the genetic associations of tropical pancreatitis, a reversible mislocalization of ductal CFTR in AIP, the association of asymptomatic pancreatic hyperenzymemia with pancreatic disorders, limitations of diagnostic tests for EPI, diagnosis of chronic pancreatitis by EUS and endoscopic pancreatic function testing and treatment of pain.
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Affiliation(s)
- Matthew J DiMagno
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan 48109-0682, USA.
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Qian NS, Liao YH, Feng QX, Tang Y, Dou KF, Tao KS. Spinal toll like receptor 3 is involved in chronic pancreatitis-induced mechanical allodynia of rat. Mol Pain 2011; 7:15. [PMID: 21342497 PMCID: PMC3048572 DOI: 10.1186/1744-8069-7-15] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2010] [Accepted: 02/22/2011] [Indexed: 12/25/2022] Open
Abstract
Background Mechanisms underlying pain in chronic pancreatitis (CP) are incompletely understood. Our previous data showed that astrocytes were actively involved. However, it was unclear how astrocytic activation was induced in CP conditions. In the present study, we hypothesized that toll-like receptors (TLRs) were involved in astrocytic activation and pain behavior in CP-induced pain. Results To test our hypothesis, we first investigated the changes of TLR2-4 in the rat CP model induced by intrapancreatic infusion of trinitrobenzene sulfonic acid (TNBS). Western blot showed that after TNBS infusion, TLR3, but not TLR2 or TLR4, was increased gradually and maintained at a very high level for up to 5 w, which correlated with the changing course of mechanical allodynia. Double immunostaining suggested that TLR3 was highly expressed on astrocytes. Infusion with TLR3 antisense oligodeoxynucleotide (ASO) dose-dependently attenuated CP-induced allodynia. CP-induced astrocytic activation in the spinal cord was also significantly suppressed by TLR3 ASO. Furthermore, real-time PCR showed that IL-1β, TNF-α, IL-6 and monocyte chemotactic protein-1 (MCP-1) were significantly increased in spinal cord of pancreatic rats. In addition, TLR3 ASO significantly attenuated CP-induced up-regulation of IL-1β and MCP-1. Conclusions These results suggest a probable "TLR3-astrocytes-IL-1β/MCP-1" pathway as a positive feedback loop in the spinal dorsal horn in CP conditions. TLR3-mediated neuroimmune interactions could be new targets for treating persistent pain in CP patients.
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Affiliation(s)
- Nian-Song Qian
- Department of Hepatobiliary Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, PR China
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Kumar M, Verma S, Nerurkar VR. Pro-inflammatory cytokines derived from West Nile virus (WNV)-infected SK-N-SH cells mediate neuroinflammatory markers and neuronal death. J Neuroinflammation 2010; 7:73. [PMID: 21034511 PMCID: PMC2984415 DOI: 10.1186/1742-2094-7-73] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Accepted: 10/31/2010] [Indexed: 12/20/2022] Open
Abstract
Background WNV-associated encephalitis (WNVE) is characterized by increased production of pro-inflammatory mediators, glial cells activation and eventual loss of neurons. WNV infection of neurons is rapidly progressive and destructive whereas infection of non-neuronal brain cells is limited. However, the role of neurons and pathological consequences of pro-inflammatory cytokines released as a result of WNV infection is unclear. Therefore, the objective of this study was to examine the role of key cytokines secreted by WNV-infected neurons in mediating neuroinflammatory markers and neuronal death. Methods A transformed human neuroblastoma cell line, SK-N-SH, was infected with WNV at multiplicity of infection (MOI)-1 and -5, and WNV replication kinetics and expression profile of key pro-inflammatory cytokines were analyzed by plaque assay, qRT-PCR, and ELISA. Cell death was measured in SK-N-SH cell line in the presence and absence of neutralizing antibodies against key pro-inflammatory cytokines using cell viability assay, TUNEL and flow cytometry. Further, naïve primary astrocytes were treated with UV-inactivated supernatant from mock- and WNV-infected SK-N-SH cell line and the activation of astrocytes was measured using flow cytometry and ELISA. Results WNV-infected SK-N-SH cells induced the expression of IL-1β, -6, -8, and TNF-α in a dose- and time-dependent manner, which coincided with increase in virus-induced cell death. Treatment of cells with anti-IL-1β or -TNF-α resulted in significant reduction of the neurotoxic effects of WNV. Furthermore treatment of naïve astrocytes with UV-inactivated supernatant from WNV-infected SK-N-SH cell line increased expression of glial fibrillary acidic protein and key inflammatory cytokines. Conclusion Our results for the first time suggest that neurons are one of the potential sources of pro-inflammatory cytokines in WNV-infected brain and these neuron-derived cytokines contribute to WNV-induced neurotoxicity. Moreover, cytokines released from neurons also mediate the activation of astrocytes. Our data define specific role(s) of WNV-induced pro-inflammatory cytokines and provide a framework for the development of anti-inflammatory drugs as much-needed therapeutic interventions to limit symptoms associated with WNVE.
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Affiliation(s)
- Mukesh Kumar
- Retrovirology Research Laboratory, Department of Tropical Medicine, Medical Microbiology and Pharmacology, John A, Burns School of Medicine, University of Hawaii at Manoa, 651 Ilalo Street, BSB 325AA, Honolulu, Hawaii 96813, USA
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31
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Abstract
Immune cells and glia interact with neurons to alter pain sensitivity and to mediate the transition from acute to chronic pain. In response to injury, resident immune cells are activated and blood-borne immune cells are recruited to the site of injury. Immune cells not only contribute to immune protection but also initiate the sensitization of peripheral nociceptors. Through the synthesis and release of inflammatory mediators and interactions with neurotransmitters and their receptors, the immune cells, glia and neurons form an integrated network that coordinates immune responses and modulates the excitability of pain pathways. The immune system also reduces sensitization by producing immune-derived analgesic and anti-inflammatory or proresolution agents. A greater understanding of the role of the immune system in pain processing and modulation reveals potential targets for analgesic drug development and new therapeutic opportunities for managing chronic pain.
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32
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Kuzhandaivel A, Margaryan G, Nistri A, Mladinic M. Extensive glial apoptosis develops early after hypoxic-dysmetabolic insult to the neonatal rat spinal cord in vitro. Neuroscience 2010; 169:325-38. [DOI: 10.1016/j.neuroscience.2010.05.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 05/03/2010] [Accepted: 05/05/2010] [Indexed: 01/08/2023]
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