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Xiao WX, Yang X, Wang M. Drug sensitivity testing during dental pulp-dentin complex repair: its effect on treatment outcome and prognosis. Am J Transl Res 2024; 16:2814-2827. [PMID: 39114684 PMCID: PMC11301483 DOI: 10.62347/icyr9713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Accepted: 06/05/2024] [Indexed: 08/10/2024]
Abstract
OBJECTIVE To assess the efficacy of targeted therapy based on drug sensitivity testing (DST) results in patients with acute pulpitis (AP). METHODS A total of 80 cases of AP were included retrospectively and divided into two groups: control (Ctrl) group (conventional drug palliative therapy, n=40) and experimental (Exp) group (DST + non-resistant drugs, n=40). The clinical data and laboratory examination data of patients, including bacterial culture data, drug sensitivity test results, Ca and P contents in dental pulp, visual analogue scale (AVS), treatment satisfaction, and dental pulp incidence, were collected and analyzed. RESULTS Prevotella melaninogenica, Fusobacterium nucleatum, and Porphyromonas gingivalis exhibited higher resistance rates (RS) to penicillin and amoxicillin but no resistance to imipenem and metronidazole. The content of Ca and P in the dental pulp of the Exp group patients was significantly higher than that of the Ctrl group (P=0.006). The total response rate (95% vs. 77.5%, P=0.018) and overall patient satisfaction (92.5% vs. 80%, P=0.021) were also significantly higher in the Exp group than in the Ctrl group. Additionally, when the follow-up duration exceeded 1 year, the incidence of dental pulp reactions in the Exp group was significantly lower than that of the Ctrl group (P=0.026). CONCLUSIONS These findings suggest that Gram-negative anaerobes are the predominant oral pathogens in patients with AP. Imipenem and metronidazole demonstrate the most effective anti-infective properties against these anaerobes. Utilizing DST to select non-resistant drugs for treatment prior to therapy effectively enhances clinical outcomes for patients with AP.
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Affiliation(s)
- Wei-Xiong Xiao
- Department of Stomatology, Wangjiang Hospital, Sichuan UniversityChengdu 610065, Sichuan, China
| | - Xi Yang
- Department of Stomatology, Stomatological Hospital of Chongqing Medical UniversityChongqing 400015, China
| | - Min Wang
- Department of Stomatology, Wangjiang Hospital, Sichuan UniversityChengdu 610065, Sichuan, China
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Ro JY, Zhang Y, Asgar J, Shou H, Chung MK, Melemedjian OK, Da Silva JT, Chen S. Forced swim stress exacerbates inflammation-induced hyperalgesia and oxidative stress in the rat trigeminal ganglia. FRONTIERS IN PAIN RESEARCH 2024; 5:1372942. [PMID: 38721062 PMCID: PMC11076691 DOI: 10.3389/fpain.2024.1372942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 04/09/2024] [Indexed: 06/12/2024] Open
Abstract
This study investigates the impact of combining psychophysical stress, induced by forced swim (FSS), with masseter inflammation on reactive oxygen species (ROS) production in trigeminal ganglia (TG), TRPA1 upregulation in TG, and mechanical hyperalgesia. In a rat model, we demonstrate that FSS potentiates and prolongs CFA-induced ROS upregulation within TG. The ROS levels in CFA combined with FSS group surpass those in the CFA-only group on days 4 and 28 post-treatment. FSS also enhances TRPA1 upregulation in TG, with prolonged expression compared to CFA alone. Furthermore, CFA-induced mechanical hyperalgesia is significantly prolonged by FSS, persisting up to day 28. PCR array analyses reveal distinct alterations in oxidative stress genes under CFA and CFA combined with FSS conditions, suggesting an intricate regulation of ROS within TG. Notably, genes like Nox4, Hba1, Gpx3, and Duox1 exhibit significant changes, providing potential targets for managing oxidative stress and inflammatory pain. Western blot and immunohistochemistry confirm DUOX1 protein upregulation and localization in TG neurons, indicating a role in ROS generation under inflammatory and stress conditions. This study underscores the complex interplay between psychophysical stress, inflammation, and oxidative stress in the trigeminal system, offering insights into novel therapeutic targets for pain management.
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Affiliation(s)
- Jin Y. Ro
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD, United States
| | - Youping Zhang
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD, United States
| | - Jamila Asgar
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD, United States
| | - Huizhong Shou
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD, United States
| | - Man-Kyo Chung
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD, United States
| | - Ohannes K. Melemedjian
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD, United States
| | - Joyce T. Da Silva
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD, United States
| | - Shou Chen
- Division of Biostatistics and Bioinformatics, Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, MD, United States
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3
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Shahsavari F, Abbasnejad M, Esmaeili-Mahani S, Raoof M. The ability of orexin-A to modify pain-induced cyclooxygenase-2 and brain-derived neurotrophic factor expression is associated with its ability to inhibit capsaicin-induced pulpal nociception in rats. Korean J Pain 2022; 35:261-270. [PMID: 35768981 PMCID: PMC9251390 DOI: 10.3344/kjp.2022.35.3.261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/30/2022] [Accepted: 04/08/2022] [Indexed: 11/26/2022] Open
Abstract
Background The rostral ventromedial medulla (RVM) is a critical region for the management of nociception. The RVM is also involved in learning and memory processes due to its relationship with the hippocampus. The purpose of the present study was to investigate the molecular mechanisms behind orexin-A signaling in the RVM and hippocampus’s effects on capsaicin-induced pulpal nociception and cognitive impairments in rats. Methods Capsaicin (100 g) was applied intradentally to male Wistar rats to induce inflammatory pulpal nociception. Orexin-A and an orexin-1 receptor antagonist (SB-334867) were then microinjected into the RVM. Immunoblotting and immunofluorescence staining were used to check the levels of cyclooxygenase-2 (COX-2) and brain-derived neurotrophic factor (BDNF) in the RVM and hippocampus. Results Interdental capsaicin treatment resulted in nociceptive responses as well as a reduction in spatial learning and memory. Additionally, it resulted in decreased BDNF and increased COX-2 expression levels. Orexin-A administration (50 pmol/1 μL/rat) could reverse such molecular changes. SB-334867 microinjection (80 nM/1 μL/rat) suppressed orexin’s effects. Conclusions Orexin-A signaling in the RVM and hippocampus modulates capsaicin-induced pulpal nociception in male rats by increasing BDNF expression and decreasing COX-2 expression.
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Affiliation(s)
- Fatemeh Shahsavari
- Department of Biology, Faculty of Sciences, Shahid Bahonar University, Kerman, Iran
| | - Mehdi Abbasnejad
- Department of Biology, Faculty of Sciences, Shahid Bahonar University, Kerman, Iran
| | - Saeed Esmaeili-Mahani
- Department of Biology, Faculty of Sciences, Shahid Bahonar University, Kerman, Iran.,Neuroscience Research Center, Kerman University of Medical Sciences, Kerman, Iran
| | - Maryam Raoof
- Academisch Centrum Tandheelkunde Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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4
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Yu F, Li M, Wang Q, Wang J, Wu S, Zhou R, Jiang H, Li X, Zhou Y, Yang X, He X, Cheng Y, Ren X, Zhang H, Tian M. Spatiotemporal dynamics of brain function during the natural course in a dental pulp injury model. Eur J Nucl Med Mol Imaging 2022; 49:2716-2722. [PMID: 35304628 PMCID: PMC9206688 DOI: 10.1007/s00259-022-05764-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 03/11/2022] [Indexed: 12/01/2022]
Abstract
Purpose Toothache, a common disorder afflicting most people, shows distinct features at different clinical stages. This study aimed to depict metabolic changes in brain and investigate the potential mechanism involved in the aberrant affective behaviors during the natural process of toothache. Methods We investigated the spatiotemporal patterns of brain function during the natural course of toothache in a rat model of dental pulp injury (DPI) by using positron emission tomography (PET). Results Glucose metabolism peaked on the 3rd day and gradually decreased in several brain regions after DPI, which was in line with the behavioral and histological results. PET imaging showed that visual pathway was involved in the regulation of toothache. Meanwhile, the process of emotional regulation underlying toothache was mediated by N-methyl-D-aspartic receptor subunit 2B (NR2B) in the caudal anterior cingulate cortex (cACC). Conclusion Our results revealed the spatiotemporal neurofunctional patterns during toothache process and preliminarily elucidated the role of NR2B in cACC in the regulation of toothache-related affective behaviors. Supplementary Information The online version contains supplementary material available at 10.1007/s00259-022-05764-2.
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Affiliation(s)
- Feiyan Yu
- Department of Periodontology, Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Shanxi Medical University School and Hospital of Stomatology, No. 63, New South Road, Yingze District, Taiyuan, 030001, Shanxi, China
| | - Miao Li
- Department of Periodontology, Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Shanxi Medical University School and Hospital of Stomatology, No. 63, New South Road, Yingze District, Taiyuan, 030001, Shanxi, China
| | - Qianqian Wang
- Department of Periodontology, Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Shanxi Medical University School and Hospital of Stomatology, No. 63, New South Road, Yingze District, Taiyuan, 030001, Shanxi, China
| | - Jing Wang
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Shuang Wu
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Rui Zhou
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Han Jiang
- PET-CT Center, Fujian Medical University Union Hospital, Fuzhou, 350001, Fujian, China
| | - Xiaoyi Li
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Yu Zhou
- Department of Periodontology, Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Shanxi Medical University School and Hospital of Stomatology, No. 63, New South Road, Yingze District, Taiyuan, 030001, Shanxi, China
| | - Xi Yang
- Department of Periodontology, Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Shanxi Medical University School and Hospital of Stomatology, No. 63, New South Road, Yingze District, Taiyuan, 030001, Shanxi, China
| | - Xiao He
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China.,Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, 310009, Zhejiang, China.,Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, 310009, Zhejiang, China
| | - Yan Cheng
- First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Xiuyun Ren
- Department of Periodontology, Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Shanxi Medical University School and Hospital of Stomatology, No. 63, New South Road, Yingze District, Taiyuan, 030001, Shanxi, China.
| | - Hong Zhang
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China. .,Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, 310009, Zhejiang, China. .,Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, 310009, Zhejiang, China.
| | - Mei Tian
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China. .,Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, 310009, Zhejiang, China. .,Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, 310009, Zhejiang, China. .,Human Phenome Institute, Fudan University, Shanghai, 201203, China.
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Kooshki R, Nekouei A, Rafie F, Abbasnejad M, Rahbar I, Raoof M. α-Pinene influence on pulpal pain-induced learning and memory impairment in rats via modulation of the GABAA receptor. Adv Biomed Res 2022; 11:60. [PMID: 36124022 PMCID: PMC9482378 DOI: 10.4103/abr.abr_139_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 06/30/2021] [Accepted: 08/01/2021] [Indexed: 11/04/2022] Open
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Mohamadi-Jorjafki E, Abbasnejad M, Kooshki R, Esmaeili-Mahani S, Raoof M. Mode of delivery alters dental pulp nociception and pain-induced changes in cognitive performance in adults male rats. Can J Physiol Pharmacol 2020; 98:717-724. [PMID: 32516558 DOI: 10.1139/cjpp-2019-0370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
This study examined the effects of delivery mode on the response to inflammatory pulpal pain and pain-induced changes in cognitive performance in adult rats. Experiments were done on rats born by vaginal or caesarean section (C-section) delivery. Dental pulp was irritated by intradental capsaicin (100 μg) application and then nociceptive scores were recorded for 40 min. Spatial and passive avoidance learning and memory were assessed using the Morris water maze (MWM) and shuttle box tools, respectively. Additionally, in vivo recording of field excitatory postsynaptic potential (fEPSP) in the CA1 of the hippocampus was used to verify synaptic plasticity. Capsaicin produced more significant nociceptive behavior in vaginally delivered rats compared to C-section rats (P < 0.01). C-section-delivered rats show better performance in both MWM and shuttle box tests. Likewise, C-section rats had greater fEPSP slopes compared to the vaginally delivered group (P < 0.05). Capsaicin impairs cognitive performance in rats born by each delivery route. However, capsaicin effects were more significant in rats delivered vaginally than by C-section. Overall, C-section-delivered rats show lower sensitivity to capsaicin-evoked pulpal nociception and better cognitive performance than vaginally delivered rats. These effects are in part mediated by reduced neuroinflammation and enhanced neuronal synaptic plasticity following C-section delivery.
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Affiliation(s)
- Elham Mohamadi-Jorjafki
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Mehdi Abbasnejad
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Razieh Kooshki
- Department of Biology, Faculty of Sciences, Lorestan University, Khorramabad, Iran
| | - Saeed Esmaeili-Mahani
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Maryam Raoof
- Endodontology Research Center, Kerman University of Medical Sciences, Kerman, Iran.,Department of Orofacial Pain and Dysfunction, Academic Center for Dentistry of Amsterdam (ACTA), University of Amsterdam and Vrije Universities Amsterdam, Amsterdam, the Netherlands
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7
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Shahsavari F, Abbasnejad M, Raoof M, Esmaeili-Mahani S. The rostral ventromedial medulla orexin 1 receptors and extracellular signal-regulated kinase in hippocampus are involved in modulation of anxiety behavior induced by dental pulp nociception in adult male rats. Arch Oral Biol 2020; 116:104778. [PMID: 32474210 DOI: 10.1016/j.archoralbio.2020.104778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 05/21/2020] [Accepted: 05/21/2020] [Indexed: 11/16/2022]
Abstract
OBJECTIVES To explore the role of rostral ventromedial medulla (RVM) orexin 1 receptors (OX1R) on orofacial nociception -induced anxiety and locomotion in rats. DESIGN Forty two adult male Wistar rats (220-270 gr) were randomly divided into 7 groups (n = 6) as follows: untreated control, capsaicin, capsaicin vehicle-treated group (sham operation), capsaicin groups pretreated by intra-RVM administration orexin 1 receptor (OX1R) agonist (orexin A) or antagonist (SB-334867) and the capsaicin groups treated by drugs vehicles (DMSO or aCSF). Orofacial nociception was induced by intradental application of capsaicin (100 μg) into the incisors of rats. Anxiety level and locomotor activity were measured by the elevated plus maze (EPM) and open field (OF) tests, respectively. Hippocampal levels of phosphorylated extracellular signal regulated Kinase (p-ERK) was also assessed by western blotting. RESULTS Intradental application of capsaicin significantly increased anxiety and decreased locomotion behaviors. Intra-RVM microinjection of orexin-A significantly prevented capsaicin-induced anxiety-like behavior and increased locomotor activity in the EPM and OF tests. These effects were inhibited by SB-334867. Furthermore, orexin-A significantly increased p-ERK levels in capsaicin-treated rats. This effect was inhibited by pretreatment of the rats with SB-334867. CONCLUSIONS The results suggest that both OX1R signaling in the RVM and hippocampal p-ERK signaling are involved in orofacial nociception-induced anxiety as well as locomotor activity.
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Affiliation(s)
- Fatemeh Shahsavari
- Department of Biology, Faculty of Sciences, Shahid Bahonar University, Kerman, Iran
| | - Mehdi Abbasnejad
- Department of Biology, Faculty of Sciences, Shahid Bahonar University, Kerman, Iran.
| | - Maryam Raoof
- Neuroscience Research Center, Kerman University of Medical Sciences, Kerman, Iran; Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Saeed Esmaeili-Mahani
- Department of Biology, Faculty of Sciences, Shahid Bahonar University, Kerman, Iran; Neuroscience Research Center, Kerman University of Medical Sciences, Kerman, Iran
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8
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Khan J, Puchimada B, Kadouri D, Zusman T, Javed F, Eliav E. The anti-nociceptive effects of Porphyromonas gingivalis lipopolysaccharide. Arch Oral Biol 2019; 102:193-198. [PMID: 31071639 DOI: 10.1016/j.archoralbio.2019.04.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 04/15/2019] [Accepted: 04/19/2019] [Indexed: 10/26/2022]
Abstract
OBJECTIVE The objective of this study was to assess the effect of Porphyromonas gingivalis lipopolysaccharide (PG LPS) on acute pain-related behaviour induced in rats and to measure its impact on the levels of pro-inflammatory cytokines (IL-1β, IL-6) and anti-inflammatory (IL-10) cytokines. DESIGN The Brennan model was used to induce acute pain like signs in rats' hind paw. Twenty-four hours following the surgery the rats were divided into 5 groups and the affected paws were injected with 0.2 m l of one of three commercialized forms PG LPS doses (high - 1 mg/ml, medium - 0.6 mg/m l and low - 0.2 mg/m l), diclofenac sodium (1 mg/kg) or saline. Tactile allodynia, mechanical hyperalgesia, body temperature and paw swelling were assessed at baseline, 24 h postoperatively and 2 h after the paw injection. The affected and contra-lateral paw tissue was assessed for the mentioned above cytokines levels employing enzyme-linked immunosorbent assay. RESULTS This study may suggest that PG LPS can reduce pain like behaviour via increased levels of anti-inflammatory cytokine IL-10 (5900 ± 748, p < 0.05). The high PG LPS dose and diclofenac reduced the tactile allodynia and mechanical hyperalgesia significantly (42.2 ± 4 and1.6 ± 0.3, p < 0.05). PG LPS high dose increase IL-10 levels while diclofenac reduces IL-1β levels significantly (5900 ± 748 and 1760 ± 271.2). The LPS administration had no effect on paw swelling and did not increase rat's body temperature. CONCLUSION The results demonstrated that PG LPS local application could possess anti- nociceptive properties, which at least in part is mediated by an increase in IL-10 levels.
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Affiliation(s)
- Junad Khan
- Orofacial Pain and Temporomandibular Joint Disorders, Eastman Institute for Oral Health, University of Rochester, 625 Elmwood Avenue, Rochester, NY, 14620, USA.
| | - Bollama Puchimada
- Department of Diagnostic Sciences, Rutgers School of Dental Medicine, NJ, USA
| | - Daniel Kadouri
- Oral Biology, Rutgers School of Dental Medicine, NJ, USA
| | - Tali Zusman
- Department of Diagnostic Sciences, Rutgers School of Dental Medicine, NJ, USA
| | - Fawad Javed
- Department of Periodontology, Stony Brook University, Stony Brook, NY, USA; Laboratory for Periodontal-, Implant-, Phototherapy (LA-PIP), School of Dental Medicine, Stony Brook University, Stony Brook, NY, USA
| | - Eli Eliav
- Eastman Institute for Oral Health, University of Rochester, NY, USA
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9
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Rahbar I, Abbasnejad M, Haghani J, Raoof M, Kooshki R, Esmaeili-Mahani S. The effect of central administration of alpha-pinene on capsaicin-induced dental pulp nociception. Int Endod J 2019; 52:307-317. [PMID: 30152861 DOI: 10.1111/iej.13006] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 08/23/2018] [Indexed: 01/17/2023]
Abstract
AIM To assess the effects of central administration of α-pinene alone and in combination with either bicuculline or naloxone, as GABAA and μ-opioid receptor antagonists, respectively, on capsaicin-induced dental pulp stimulation in rats. METHODOLOGY Forty-eight adult male Wistar rats aged 2 months (230-270 g) were cannulated via their lateral ventricles for the central administration of the drugs. α-Pinene was injected at 0.1, 0.2 and 0.4 μmol L-1 . Then, dental pulp stimulation was induced by intradental application of capsaicin solution (100 μg), and nociceptive scores were recorded for up to 40 min. For investigation of the anti-inflammatory effects of α-pinene, expression of COX-2 in the subnucleolus caudalis (Vc) of rats was determined using immunofluorescence staining. Nonparametric repeated measure Friedman and Kruskal-Wallis tests as well as parametric one-way analysis of variance were used for the statistical analysis. RESULTS α-Pinene at 0.2 and 0.4 μmol L-1 was able to decrease capsaicin-induced nociception. Moreover, there was a significant increase in the expression of COX-2-positive cells in the Vc of capsaicin-treated rats (P < 0.01). This effect was prohibited by α-pinene (0.4 μmol L-1 ). Co-administration of bicuculline (1 μg per rat) or naloxone (6 μg per rat) with α-pinene (0.4 μmol L-1 ), however, prevented the inhibitory effects of α-pinene on both capsaicin-induced pulp nociception and COX-2 over-expression. CONCLUSIONS Pinene exhibited significant curable effects on capsaicin-induced pulpal nociception and inflammation mainly via pharmacological interfacing with GABAA and μ-opioid receptors.
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Affiliation(s)
- I Rahbar
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Iran
| | - M Abbasnejad
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Iran
| | - J Haghani
- Endodontology Research Center, Kerman University of Medical Sciences, Iran
| | - M Raoof
- Laboratory of Molecular Neuroscience, Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - R Kooshki
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Iran
| | - S Esmaeili-Mahani
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Iran
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10
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Pourrahimi AM, Abbasnejad M, Esmaeili-Mahani S, Kooshki R, Raoof M. Intra-periaqueductal gray matter administration of orexin-A exaggerates pulpitis-induced anxiogenic responses and c-fos expression mainly through the interaction with orexin 1 and cannabinoid 1 receptors in rats. Neuropeptides 2019; 73:25-33. [PMID: 30587409 DOI: 10.1016/j.npep.2018.12.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2018] [Revised: 12/06/2018] [Accepted: 12/10/2018] [Indexed: 01/15/2023]
Abstract
Different types of trigeminal pains are frequently associated with psychophysiological concerns. Orexin-A and orexin 1 receptor (OX1R) are involved in modulation of both trigeminal pain and anxiety responses. Ventrolateral periaqueductal gray matter (vlPAG), a controlling site for nociception and emotion, receives orexinergic inputs. Here, the role of vlPAG OX1Rs and their interaction with cannabinoid 1 (CB1) receptor was evaluated in anxiety-like behavior following capsaicin-induced dental pulp pain. Rats were cannulated in the vlPAG and orexin-A was injected at the doses of 0.17, 0.35 and 0.51 μg/rat prior to the induction of pain. The elevated plus maze (EPM) and open field (OF) tests were used for assessing the anxiety responses. In addition, the induction of c-fos, in the vlPAG, was investigated using immunofluorescence microscopy. Capsaicin-treated rats displayed significantly higher anxiogenic behavior on EPM and OF tests. Pretreatment with orexin-A (0.51 μg/rat) attenuated capsaicin-mediated nociception, while exaggerated anxiogenic responses (p < 0.05). In addition, orexin-A effects were diminished by the administration of OX1R (SB-334867, 12 μg/rat) and cannabinoid 1 (AM251, 4 μg/rat) receptor antagonists. Intradental capsaicin induced a significant increase in c-fos expression in the vlPAG that was exaggerated by orexin-A (0.51 μg/rat). Blockage of OX1R and CB1 receptors attenuated the effect of orexin-A on c-fos expression in capsaicin-treated rats. In conclusion, the data suggest that manipulation of OX1R and CB1 receptors in the vlPAG alters capsaicin-evoked anxiety like behaviors and c-fos induction in rats.
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Affiliation(s)
- Ali Mohammad Pourrahimi
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Mehdi Abbasnejad
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Saeed Esmaeili-Mahani
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran; Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Razieh Kooshki
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Maryam Raoof
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran; Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.
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11
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Raoof M, Soofiabadi S, Abbasnejad M, Kooshki R, Esmaeili-Mahani S, Mansoori M. Activation of orexin-1 receptors in the ventrolateral periaqueductal grey matter (vlPAG) modulates pulpal nociception and the induction of substance P in vlPAG and trigeminal nucleus caudalis. Int Endod J 2018; 52:318-328. [PMID: 30152877 DOI: 10.1111/iej.13007] [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: 04/10/2018] [Accepted: 08/24/2018] [Indexed: 12/24/2022]
Abstract
AIM To characterize the role of orexin-1 receptors (OX1Rs) in ventrolateral periaqueductal grey matter (vlPAG) on modulation of capsaicin-induced pulpal nociception in rats. METHODOLOGY Sixty-six adult male Wistar rats (2 months old) weighing between 230 and 260 g were used. The animals were cannulated for microinjection of drugs into the vlPAG matter. Pulpalgia was induced by intradental application of capsaicin solution (100 μg) into the incisor teeth of the rats. Ten min prior to capsaicin application, orexin-A (50, 100 and 150 pmol L-1 per rat) was administered. Orexin-A (150 pmol L-1 ) was also co-administrated with SB-334867 (40 nmol L-1 per rat), an OX1Rs antagonist; or bicuculline (1 μg per rat), a GABAA receptors antagonist. Moreover, treatment effects on the release of pro-nociceptive modulator substance P (SP) in vlPAG and trigeminal nucleus caudalis (Vc) of rats were explored using an immunofluorescence technique. One-way analysis of variance was used for the statistical analysis. RESULTS Orexin-A dose-dependently decreased capsaicin-induced nociceptive behaviour. However, SB-334867 (40 nmol L-1 per rat) pretreatment (P < 0.05), but not bicuculline (1 μg per rat), attenuated the analgesic effect of orexin-A (150 pmol L-1 ). The level of SP was significantly increased in Vc and decreased in vlPAG of capsaicin-treated rats (P < 0.05). Capsaicin-induced changes in SP levels, however, were prohibited by orexin-A treatment (150 pmol L-1 ) (P < 0.05). CONCLUSIONS Orexin-A administration into the vlPAG was associated with an inhibitory effect on capsaicin-induced pulpal nociception and bidirectional effects on the induction of SP in vlPAG and Vc of rats. Central activation of OX1Rs is a potential therapeutic tool for pulpalgia.
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Affiliation(s)
- M Raoof
- Endodontology Research Center, Kerman University of Medical Sciences, Kerman, Iran
| | - S Soofiabadi
- Neuroscience Research Center, Kerman University of Medical Sciences, Kerman, Iran
| | - M Abbasnejad
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - R Kooshki
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - S Esmaeili-Mahani
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - M Mansoori
- Neuroscience Research Center, Kerman University of Medical Sciences, Kerman, Iran
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Shahsavari F, Abbasnejad M, Esmaeili-Mahani S, Raoof M. Orexin-1 receptors in the rostral ventromedial medulla are involved in the modulation of capsaicin evoked pulpal nociception and impairment of learning and memory. Int Endod J 2018; 51:1398-1409. [PMID: 29858522 DOI: 10.1111/iej.12958] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Accepted: 05/30/2018] [Indexed: 12/01/2022]
Abstract
AIM To investigate the role of rostral ventromedial medulla orexin-1 receptors in the modulation of orofacial nociception as well as nociception-induced learning and memory impairment in adult male rats. METHODOLOGY Pulpal nociception was induced by intradental application of capsaicin (100 μg) into the incisors of rats. Orexin-1 receptors agonist (orexin-A, 10, 25 and 50 pmol L-1 rat-1 ) and antagonist (SB-334867-A, 40 and 80 nmol L-1 rat-1 ) were microinjected into the rostral ventromedial medulla prior to capsaicin administration. Total time spent on nocifensive behaviour was recorded by direct visualization of freely moving rats whilst learning and memory were evaluated by the Morris water maze test. One-way analysis of variance and repeated-measures were used for the statistical analysis. RESULTS Capsaicin-treated rats had a significant increase of nocifensive behaviours (P < 0.001), as well as learning and memory impairment (P < 0.001). However, intraventromedial medulla prior micro-injection of orexin-A (50 pmol L-1 rat-1 ) significantly reduced the nociceptive behaviour (P < 0.001). This effect was blocked by pre-treatment with SB334867-A (80 nmol L-1 rat-1 ). Orexin-A (50 pmol L-1 rat-1 ) also inhibited nociception-induced learning and memory deficits. Moreover, administration of SB-334867-A (80 nmol L-1 rat-1 ) plus orexin-A (50 pmol L-1 rat-1 ) had no effect on learning and memory deficits induced by capsaicin. CONCLUSIONS The data suggest that rostral ventromedial medulla orexin-A receptors are involved in pulpal nociceptive modulation and improvement of learning and memory deficits induced by intradental application of capsaicin.
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Affiliation(s)
- F Shahsavari
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - M Abbasnejad
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - S Esmaeili-Mahani
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - M Raoof
- Neuroscience Research Center, Kerman University of Medical Sciences, Kerman, Iran.,Endodontology Research Center, Kerman University of Medical Sciences, Kerman, Iran
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