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Xu Q, Jin L, Wang L, Tang Y, Wu H, Chen Q, Sun L. The role of gonadal hormones in regulating opioid antinociception. Ann Med 2024; 56:2329259. [PMID: 38738380 PMCID: PMC11095291 DOI: 10.1080/07853890.2024.2329259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Accepted: 03/06/2024] [Indexed: 05/14/2024] Open
Abstract
Opioids are the most prescribed drugs for the alleviation of pain. Both clinical and preclinical studies have reported strong evidence for sex-related divergence regarding opioid analgesia. There is an increasing amount of evidence indicating that gonadal hormones regulate the analgesic efficacy of opioids. This review presents an overview of the importance of gonadal steroids in modulating opioid analgesic responsiveness and focuses on elaborating what is currently known regarding the underlyingmechanism. We sought to identify the link between gonadal hormones and the effect of oipiod antinociception.
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Affiliation(s)
- Qi Xu
- Department of Anesthesiology, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Lin Jin
- Department of Anesthesiology, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - LuYang Wang
- Department of Anesthesiology, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - YingYing Tang
- Department of Anesthesiology, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Hui Wu
- Department of Anesthesiology, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Qing Chen
- Department of Anesthesiology, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - LiHong Sun
- Department of Anesthesiology, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
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Sessle BJ. Modulatory Processes in Craniofacial Pain States. ADVANCES IN NEUROBIOLOGY 2024; 35:107-124. [PMID: 38874720 DOI: 10.1007/978-3-031-45493-6_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2024]
Abstract
Pain is a common symptom associated with many disorders affecting the craniofacial tissues that include the teeth and their supporting structures, the jaw, face and tongue muscles, and the temporomandibular joint. Most acute craniofacial pain states are easily recognized and readily treated, but chronic craniofacial pain states (e.g., temporomandibular disorders [TMD], trigeminal neuropathies, and some headaches) may be especially challenging to manage successfully. This chapter provides an overview of the processes that underlie craniofacial pain, with a focus on the pain-modulatory mechanisms operating in craniofacial tissues and in the central nervous system (CNS), including the role of endogenous chemical processes such as those involving opioids. The chapter outlines in particular findings from preclinical studies that have provided substantial information about the neural as well as nonneural (e.g., glial) processes involved in the initiation, transmission, and modulation of nociceptive signals in the trigeminal system, and also draws attention to their clinical correlates. The increased understanding gained from these preclinical studies of how nociceptive signals can be modulated will contribute to improvements in presently available therapeutic approaches to manage craniofacial pain as well as to the development of novel analgesic approaches.
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Affiliation(s)
- Barry J Sessle
- Department of Oral Physiology Faculty of Dentistry, Department of Physiology Faculty of Medicine, Centre for the Study of Pain, University of Toronto, Toronto, ON, Canada.
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Sangalli L, Souza LC, Letra A, Shaddox L, Ioannidou E. Sex as a Biological Variable in Oral Diseases: Evidence and Future Prospects. J Dent Res 2023; 102:1395-1416. [PMID: 37967405 DOI: 10.1177/00220345231197143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2023] Open
Abstract
The interest of the scientific community on sex and gender differences in health and disease has increased substantially over the past 25 to 30 y as a result of a long process of events and policies in the biomedical field. This is crucial as compelling evidence from human and animal model studies has demonstrated that sex and gender influence health, molecular and cellular processes, and response and predisposition to disease. The present scoping review aims to provide a synthesis of sex differences in oral diseases, ranging from periodontal disease to orofacial pain conditions, from risk of caries development to apical periodontitis. Overall, findings from this review further support a role for sexual dimorphism influencing disease predisposition and/or progression in oral diseases. Of note, this review also highlights the lack of consideration of additional factors such as gender and other psychosocial and external factors potentially influencing oral health and disease. New conceptual frameworks capable of capturing multiple fundamental domains and measurements should be developed in clinical and preclinical studies to inform sex-based individualized preventive and treatment strategies.
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Affiliation(s)
- L Sangalli
- College of Dental Medicine-Illinois, Midwestern University, Downers Grove, IL, USA
| | - L C Souza
- Center for Craniofacial Research, Department of Endodontics, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - A Letra
- Departments of Oral and Craniofacial Sciences, Endodontics, and Center for Craniofacial and Dental Genetics, University of Pittsburgh School of Dental Medicine, Pittsburgh, PA, USA
| | - L Shaddox
- Center for Oral Health Research, Division of Periodontology, University of Kentucky, College of Dentistry, Lexington, KY, USA
| | - E Ioannidou
- UCSF, Department of Orofacial Sciences, San Francisco, CA, USA
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Javed F, Ahmed HB, Zafar MS, Shaikh MS, Rossouw PE, Michelogiannakis D, Alstergren P. "Testosterone decreases temporomandibular joint nociception"- A systematic review of studies on animal models. Arch Oral Biol 2022; 139:105430. [PMID: 35461068 DOI: 10.1016/j.archoralbio.2022.105430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 03/17/2022] [Accepted: 04/10/2022] [Indexed: 12/09/2022]
Abstract
OBJECTIVE The aim of the present systematic review was to assess the effect of testosterone on temporomandibular joint (TMJ) nociception. DESIGN A systematic review of pertinent indexed literature was performed. The focused question addressed was "Is there a connection between testosterone and TMJ nociception?" Original studies were included. In-vitro and ex-vivo studies, case-reports/series, letters to the Editor and commentaries were not sought. Indexed databases were searched without time and language restrictions up to and including September 2021 using different free text key words: testosterone OR "male sex hormones" OR "gonadal hormones" AND "temporomandibular joint" OR "temporomandibular dysfunction" AND nociception AND males. The literature search was performed in accordance with the preferred reporting outcomes of systematic reviews and meta-analysis guidelines. The risk of bias (RoB) was assessed using the SYstematic Review Centre for Laboratory animal Experimentation (SYRCLE) tool. RESULTS Out of the 406 studies identified, seven studies on animal-models were included. All studies were performed in rats with age and weight ranging between 21 and 90 days and 200-300 g, respectively. Testosterone was administered in concentrations ranging between 1 and 10 mg/Kg. Results from all studies showed that testosterone administration in gonadectomized male rats reduces induced TMJ nociception. The RoB was high in 3 and unclear in 4 studies. CONCLUSION Testosterone offers protection against TMJ nociception in male rats; however, from a clinical perspective, potential contribution of testosterone therapy towards the management of TMD remains indeterminate.
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Affiliation(s)
- Fawad Javed
- Department of Orthodontics and Dentofacial Orthopedics, Eastman Institute for Oral Health, University of Rochester, NY 14620, United States.
| | | | - Muhammad Sohail Zafar
- Department of Restorative Dentistry, College of Dentistry, Taibah University, Al Madinah Al Munawwarah 41311, Saudi Arabia; Department of Dental Materials, Islamic International Dental College, Riphah International University, Islamabad 44000, Pakistan
| | - Muhammad Saad Shaikh
- Department of Oral Biology, Sindh Institute of Oral Health Sciences, Jinnah Sindh Medical University, Karachi 75510, Pakistan
| | - P Emile Rossouw
- Department of Orthodontics and Dentofacial Orthopedics, Eastman Institute for Oral Health, University of Rochester, NY 14620, United States
| | - Dimitrios Michelogiannakis
- Department of Orthodontics and Dentofacial Orthopedics, Eastman Institute for Oral Health, University of Rochester, NY 14620, United States
| | - Per Alstergren
- Department of Orofacial Pain and Jaw Function, Faculty of Odontology, Malmö, Sweden; Scandinavian Center for Orofacial Neurosciences (SCON), Malmö, Sweden; Specialized Pain Rehabilitation, Skåne University Hospital, Lund, Sweden
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Silveira FD, Gomes FIF, do Val DR, Freitas HC, de Assis EL, de Almeida DKC, Braz HLB, Barbosa FG, Mafezoli J, da Silva MR, Jorge RJB, Clemente-Napimoga JT, Costa DVDS, Brito GADC, Pinto VDPT, Cristino-Filho G, Bezerra MM, Chaves HV. Biological and Molecular Docking Evaluation of a Benzylisothiocyanate Semisynthetic Derivative From Moringa oleifera in a Pre-clinical Study of Temporomandibular Joint Pain. Front Neurosci 2022; 16:742239. [PMID: 35546897 PMCID: PMC9083263 DOI: 10.3389/fnins.2022.742239] [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: 07/15/2021] [Accepted: 03/14/2022] [Indexed: 11/18/2022] Open
Abstract
Objective Moringa oleifera possesses multiple biological effects and the 4-[(4′-O-acetyl-α-L- rhamnosyloxy) benzyl] isothiocyanate accounts for them. Based on the original isothiocyanate molecule we obtained a semisynthetic derivative, named 4-[(2′,3′,4′-O-triacetyl-α-L-rhamnosyloxy) N-benzyl] hydrazine carbothioamide (MC-H) which was safe and effective in a temporomandibular joint (TMJ) inflammatory hypernociception in rats. Therefore, considering that there is still a gap in the knowledge concerning the mechanisms of action through which the MC-H effects are mediated, this study aimed to investigate the involvement of the adhesion molecules (ICAM-1, CD55), the pathways heme oxygenase-1 (HO-1) and NO/cGMP/PKG/K+ATP, and the central opioid receptors in the efficacy of the MC-H in a pre-clinical study of TMJ pain. Methods Molecular docking studies were performed to test the binding performance of MC-H against the ten targets of interest (ICAM-1, CD55, HO-1, iNOS, soluble cGMP, cGMP-dependent protein kinase (PKG), K+ATP channel, mu (μ), kappa (κ), and delta (δ) opioid receptors). In in vivo studies, male Wistar rats were treated with MC-H 1 μg/kg before TMJ formalin injection and nociception was evaluated. Periarticular tissues were removed to assess ICAM-1 and CD55 protein levels by Western blotting. To investigate the role of HO-1 and NO/cGMP/PKG/K+ATP pathways, the inhibitors ZnPP-IX, aminoguanidine, ODQ, KT5823, or glibenclamide were used. To study the involvement of opioid receptors, rats were pre-treated (15 min) with an intrathecal injection of non-selective inhibitor naloxone or with CTOP, naltrindole, or norbinaltorphimine. Results All interactions presented acceptable binding energy values (below −6.0 kcal/mol) which suggest MC-H might strongly bind to its molecular targets. MC-H reduced the protein levels of ICAM-1 and CD55 in periarticular tissues. ZnPP-IX, naloxone, CTOP, and naltrindole reversed the antinociceptive effect of MC-H. Conclusion MC-H demonstrated antinociceptive and anti-inflammatory effects peripherally by the activation of the HO-1 pathway, as well as through inhibition of the protein levels of adhesion molecules, and centrally by μ and δ opioid receptors.
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Affiliation(s)
| | | | - Danielle Rocha do Val
- Graduate Programme in Biotechnology, North-Eastern Biotechnology Network, Federal University of Pernambuco, Recife, Brazil
| | | | | | | | - Helyson Lucas Bezerra Braz
- Graduate Program in Morphofunctional Sciences, Department of Morphology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil
| | | | - Jair Mafezoli
- Graduate Programme in Chemistry, Science Center, Federal University of Ceará, Fortaleza, Brazil
| | | | - Roberta Jeane Bezerra Jorge
- Graduate Program in Morphofunctional Sciences, Department of Morphology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil.,Drug Research and Development Center (NPDM), Federal University of Ceará, Fortaleza, Brazil
| | | | - Deiziane Viana da Silva Costa
- Graduate Program in Morphofunctional Sciences, Department of Morphology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil
| | - Gerly Anne de Castro Brito
- Graduate Program in Morphofunctional Sciences, Department of Morphology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil
| | - Vicente de Paulo Teixeira Pinto
- Graduate Programme in Health Sciences, Federal University of Ceará, Sobral, Brazil.,Faculty of Medicine, Federal University of Ceará, Sobral, Brazil
| | - Gerardo Cristino-Filho
- Graduate Programme in Health Sciences, Federal University of Ceará, Sobral, Brazil.,Faculty of Medicine, Federal University of Ceará, Sobral, Brazil
| | - Mirna Marques Bezerra
- Graduate Programme in Health Sciences, Federal University of Ceará, Sobral, Brazil.,Faculty of Medicine, Federal University of Ceará, Sobral, Brazil
| | - Hellíada Vasconcelos Chaves
- Graduate Programme in Health Sciences, Federal University of Ceará, Sobral, Brazil.,Faculty of Dentistry, Federal University of Ceará, Sobral, Brazil.,Graduate Program in Dentistry, Federal University of Ceará, Fortaleza, Brazil
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Ahmed F, Rahman M, Thompson R, Bereiter DA. Role of Connexin 43 in an Inflammatory Model for TMJ Hyperalgesia. FRONTIERS IN PAIN RESEARCH 2021; 2:715871. [PMID: 35295418 PMCID: PMC8915650 DOI: 10.3389/fpain.2021.715871] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 07/08/2021] [Indexed: 12/27/2022] Open
Abstract
Temporomandibular joint disorders (TMD) consist of a heterogeneous group of conditions that present with pain in the temporomandibular joint (TMJ) region and muscles of mastication. This project assessed the role of connexin 43 (Cx43), a gap junction protein, in the trigeminal ganglion (TG) in an animal model for persistent inflammatory TMJ hyperalgesia. Experiments were performed in male and female rats to determine if sex differences influence the expression and/or function of Cx43 in persistent TMJ hyperalgesia. Intra-TMJ injection of Complete Freund's Adjuvant (CFA) caused a significant increase in Cx43 expression in the TG at 4 days and 10 days post-injection in ovariectomized (OvX) female rats and OvX females treated with estradiol (OvXE), while TG samples in males revealed only marginal increases. Intra-TG injection of interference RNA for Cx43 (siRNA Cx43) 3 days prior to recording, markedly reduced TMJ-evoked masseter muscle electromyographic (MMemg) activity in all CFA-inflamed rats, while activity in sham animals was not affected. Western blot analysis revealed that at 3 days after intra-TG injection of siRNA Cx43 protein levels for Cx43 were significantly reduced in TG samples of all CFA-inflamed rats. Intra-TG injection of the mimetic peptide GAP19, which inhibits Cx43 hemichannel formation, greatly reduced TMJ-evoked MMemg activity in all CFA-inflamed groups, while activity in sham groups was not affected. These results revealed that TMJ inflammation caused a persistent increase in Cx43 protein in the TG in a sex-dependent manner. However, intra-TG blockade of Cx43 by siRNA or by GAP19 significantly reduced TMJ-evoked MMemg activity in both males and females following TMJ inflammation. These results indicated that Cx43 was necessary for enhanced jaw muscle activity after TMJ inflammation in males and females, a result that could not be predicted on the basis of TG expression of Cx43 alone.
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Bai X, Wang C, Zhang X, Feng Y, Zhang X. The role of testosterone in mu-opioid receptor expression in the trigeminal ganglia of opioid-tolerant rats. Neurosci Lett 2020; 723:134868. [PMID: 32109552 DOI: 10.1016/j.neulet.2020.134868] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 02/18/2020] [Accepted: 02/24/2020] [Indexed: 12/13/2022]
Abstract
Although tolerance serves as a major limitation in the long-term clinical use of opioids in patients with chronic severe pain, mechanisms of opioid tolerance are poorly understood. In this study, a morphine tolerance model was established by subcutaneously injecting male rats with morphine (10 mg/kg) twice a day for 10 consecutive days. In addition, a subset of morphine-tolerant rats underwent testosterone replacement therapy. The levels of mu-opioid receptor (MOR) mRNA and protein in the trigeminal ganglia (TGs) of morphine-tolerant versus control rats and of morphine-tolerant rats with vs. without testosterone replacement therapy were measured. We found that testosterone levels were significantly lower in morphine-tolerant rats than in the controls (1.248 ± 0.231 ng/ml vs. 2.223 ± 0.153 ng/ ml, respectively; p = 0.008). Furthermore, chronic morphine exposure led to a downregulation in the levels of MOR mRNA to 79.3%, and of MOR protein to 68.9%. Testosterone replacement therapy restored MOR mRNA and protein levels specifically in rats who had developed a tolerance to morphine, thereby suggesting a potential role of testosterone in the opioid-receptor response to chronic morphine exposure. In summary, our study provides evidence for the involvement of testosterone in the proper regulation of the peripheral MOR system in rats following prolonged morphine exposure. We also suggest that analgesic therapeutic measures should take into account the testosterone levels of patients who have built up a tolerance to morphine.
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Affiliation(s)
- Xiaofeng Bai
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, China Medical University, 117 North Nanjing Street, Shenyang, 110002, PR China
| | - Chun Wang
- Department of Anesthesiology, Hospital of Stomatology, China Medical University, 117 North Nanjing Street, Shenyang, 110002, PR China
| | - Xuedi Zhang
- Department of Anesthesiology, Hospital of Stomatology, China Medical University, 117 North Nanjing Street, Shenyang, 110002, PR China
| | - Yingbo Feng
- Department of Anesthesiology, Hospital of Stomatology, China Medical University, 117 North Nanjing Street, Shenyang, 110002, PR China
| | - Xia Zhang
- Department of Anesthesiology, Hospital of Stomatology, China Medical University, 117 North Nanjing Street, Shenyang, 110002, PR China.
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Barbosa Neto JO, Garcia JBS, Cartágenes MDSDS, Amaral AG, Onuchic LF, Ashmawi HA. Influence of androgenic blockade with flutamide on pain behaviour and expression of the genes that encode the NaV1.7 and NaV1.8 voltage-dependent sodium channels in a rat model of postoperative pain. J Transl Med 2019; 17:287. [PMID: 31455381 PMCID: PMC6712891 DOI: 10.1186/s12967-019-2031-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 08/18/2019] [Indexed: 11/29/2022] Open
Abstract
Background Experimental studies suggest that testosterone reduces the nociceptive response after inflammatory and neuropathic stimuli, however the underlying mechanisms have not been fully elucidated. The aims of this study were to evaluate the effect of peripheral blockade of testosterone on pain behaviour and on expression levels of the genes that encode the NaV1.7 and NaV1.8 channels, in dorsal root ganglia in an acute postoperative pain model, as well as the influence of androgen blockade on the expression of these genes. Methods Postoperative pain was induced by a plantar incision and the study group received flutamide to block testosterone receptor. The animals were submitted to behavioural evaluation preoperatively, 2 h after incision, and on the 1st, 2nd, 3rd and 7th postoperative days. Von Frey test was used to evaluate paw withdrawal threshold after mechanical stimuli and the guarding pain test to assess spontaneous pain. The expression of the genes encoding the sodium channels at the dorsal root ganglia was determined by real time quantitative polymerase chain reaction. Results Animals treated with flutamide presented lower paw withdrawal threshold at the 1st, 2nd, 3rd, and 7th postoperative days. The guarding pain test showed significant decrease in the flutamide group at 2 h and on the 3rd and 7th postoperative days. No difference was detected between the study and control groups for the gene expression. Conclusions Our data suggest an antinociceptive effect of androgens following plantar incision. The expression of genes that encode voltage-gated sodium channels was not influenced by androgen blockade.
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Affiliation(s)
- José Osvaldo Barbosa Neto
- LIM/08 - Laboratório de Anestesiologia - Laboratórios de Investigação Médica do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil.
| | | | | | - Andressa Godoy Amaral
- LIM/29 - Laboratório de Nefrologia Celular, Genética e Molecular - Laboratórios de Investigação Médica do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Luiz Fernando Onuchic
- LIM/29 - Laboratório de Nefrologia Celular, Genética e Molecular - Laboratórios de Investigação Médica do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Hazem Adel Ashmawi
- LIM/08 - Laboratório de Anestesiologia - Laboratórios de Investigação Médica do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
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Khalil R, Humann J. Testosterone modulation of ethanol effects on the �‑opioid receptor kinetics in castrated rats. Biomed Rep 2019; 11:103-109. [PMID: 31423304 PMCID: PMC6684941 DOI: 10.3892/br.2019.1230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 06/05/2019] [Indexed: 11/17/2022] Open
Abstract
The present investigation was conducted to evaluate the effects of testosterone on ethanol-induced alterations of µ-opioid receptor binding kinetics in specific brain regions of castrated rats. Male Sprague Dawley rats (100-124 g) adapted to a 12-h light/dark cycle were used. Animals were castrated under pentobarbital anesthesia. After a recovery period of 14 days, ethanol [3 g/kg as 22.5% solution in saline via intraperitoneal injection (i.p.)], testosterone [2.5 mg in 0.2 ml of olive oil via subcutaneous injection (s.c.) in the dorsal neck region] or the combination of ethanol and testosterone were administered to rats at 9:00 a.m. The control group was injected i.p. with 2 ml saline and s.c. with 0.2 ml olive oil for 7 days. Animals were sacrificed by decapitation at 2 h after the final injection. The brains were immediately removed, and the cortex, hippocampus, hypothalamus and midbrain were dissected. In an attempt to elucidate the mechanism involved in the hormonal modulation of the effects of ethanol and testosterone on the endogenous opioid system, the binding kinetics of the µ-opioid receptors were determined. The results obtained in the present study assisted in identifying the regulatory role of testosterone on ethanol-induced changes on µ-opioid receptor binding kinetics.
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Affiliation(s)
- Rafaat Khalil
- Department of Biology, Florida A&M University College of Science and Technology, Tallahassee, FL 32307, USA
| | - Jessica Humann
- Department of Biology, Florida A&M University College of Science and Technology, Tallahassee, FL 32307, USA
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Rivanor RLDC, Do Val DR, Ribeiro NA, Silveira FD, de Assis EL, Franco ÁX, Vieira LV, de Queiroz INL, Chaves HV, Bezerra MM, Benevides NMB. A lectin fraction from green seaweed Caulerpa cupressoides inhibits inflammatory nociception in the temporomandibular joint of rats dependent from peripheral mechanisms. Int J Biol Macromol 2018; 115:331-340. [DOI: 10.1016/j.ijbiomac.2018.04.065] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 04/10/2018] [Accepted: 04/11/2018] [Indexed: 12/14/2022]
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Da Silva JT, Zhang Y, Asgar J, Ro JY, Seminowicz DA. Diffuse noxious inhibitory controls and brain networks are modulated in a testosterone-dependent manner in Sprague Dawley rats. Behav Brain Res 2018; 349:91-97. [PMID: 29733874 PMCID: PMC7184319 DOI: 10.1016/j.bbr.2018.04.055] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 04/30/2018] [Accepted: 04/30/2018] [Indexed: 12/14/2022]
Abstract
Diffuse noxious inhibitory control (DNIC), which involves endogenous pain modulation, has been investigated as a potential mechanism for the differences in pain modulation observed between men and women, though the literature shows contradictory findings. We used a capsaicin-induced DNIC behavioral assay and resting state functional magnetic resonance imaging (rsfMRI) to assess the effect of testosterone on pain modulation and related brain circuitry in rats. We hypothesized that testosterone is required for DNIC that leads to efficient pain inhibition by increasing descending pain modulation. Male, female, and orchidectomized (GDX) male rats had a capsaicin injection into the forepaw to induce DNIC and mechanical thresholds were observed on the hindpaw. rsfMRI scans were acquired before and after capsaicin injection to analyze the effects of DNIC on periaqueductal gray (PAG), anterior cingulate cortex (ACC) and nucleus accumbens (NAc) connectivity to the whole brain. The strength of DNIC was higher in males compared to females and GDX males. PAG connectivity with prelimbic cortex (PrL), ACC and insula was stronger in males compared to females and GDX males, whereas females and GDX males had increased connectivity between the right ACC, hippocampus and thalamus. GDX males also showed a stronger connectivity between right ACC and NAc, and right NAc with PrL, ACC, insula and thalamus. Our findings suggest that testosterone plays a key role in reinforcing the endogenous pain inhibitory system, while circuitries related to reward and emotion are more strongly recruited in the absence of testosterone.
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Affiliation(s)
- Joyce T Da Silva
- Department of Neural and Pain Sciences, School of Dentistry, Center to Advance Chronic Pain Research, University of Maryland, Baltimore, United States.
| | - Youping Zhang
- Department of Neural and Pain Sciences, School of Dentistry, Center to Advance Chronic Pain Research, University of Maryland, Baltimore, United States
| | - Jamila Asgar
- Department of Neural and Pain Sciences, School of Dentistry, Center to Advance Chronic Pain Research, University of Maryland, Baltimore, United States
| | - Jin Y Ro
- Department of Neural and Pain Sciences, School of Dentistry, Center to Advance Chronic Pain Research, University of Maryland, Baltimore, United States
| | - David A Seminowicz
- Department of Neural and Pain Sciences, School of Dentistry, Center to Advance Chronic Pain Research, University of Maryland, Baltimore, United States
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Opposing Roles of Estradiol and Testosterone on Stress-Induced Visceral Hypersensitivity in Rats. THE JOURNAL OF PAIN 2018; 19:764-776. [PMID: 29496640 DOI: 10.1016/j.jpain.2018.02.007] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 01/30/2018] [Accepted: 02/14/2018] [Indexed: 12/19/2022]
Abstract
Chronic stress produces maladaptive pain responses, manifested as alterations in pain processing and exacerbation of chronic pain conditions including irritable bowel syndrome. Female predominance, especially during reproductive years, strongly suggests a role of gonadal hormones. However, gonadal hormone modulation of stress-induced pain hypersensitivity is not well understood. In the present study, we tested the hypothesis that estradiol is pronociceptive and testosterone is antinociceptive in a model of stress-induced visceral hypersensitivity (SIVH) in rats by recording the visceromotor response to colorectal distention after a 3-day forced swim (FS) stress paradigm. FS induced visceral hypersensitivity that persisted at least 2 weeks in female, but only 2 days in male rats. Ovariectomy blocked and orchiectomy facilitated SIVH. Furthermore, estradiol injection in intact male rats increased SIVH and testosterone in intact female rats attenuated SIVH. Western blot analyses indicated estradiol increased excitatory glutamate ionotropic receptor NMDA type subunit 1 expression and decreased inhibitory metabotropic glutamate receptor 2 expression after FS in male thoracolumbar spinal cord. In addition, the presence of estradiol during stress increased spinal brain-derived neurotrophic factor (BDNF) expression independent of sex. In contrast, testosterone blocked the stress-induced increase in BDNF expression in female rats. These data suggest that estradiol facilitates and testosterone attenuates SIVH by modulating spinal excitatory and inhibitory glutamatergic receptor expression. PERSPECTIVE SIVH is more robust in female rats. Estradiol facilitates whereas testosterone dampens the development of SIVH. This could partially explain the greater prevalence of certain chronic visceral pain conditions in women. An increase in spinal BDNF is concomitant with increased stress-induced pain. Pharmaceutical interventions targeting this molecule could provide promising alleviation of SIVH in women.
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Abstract
This paper is the thirty-ninth consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2016 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior, and the roles of these opioid peptides and receptors in pain and analgesia, stress and social status, tolerance and dependence, learning and memory, eating and drinking, drug abuse and alcohol, sexual activity and hormones, pregnancy, development and endocrinology, mental illness and mood, seizures and neurologic disorders, electrical-related activity and neurophysiology, general activity and locomotion, gastrointestinal, renal and hepatic functions, cardiovascular responses, respiration and thermoregulation, and immunological responses.
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and CUNY Neuroscience Collaborative, Queens College, City University of New York, Flushing, NY 11367, United States.
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14
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Alvarez P, Green PG, Levine JD. Neonatal Handling Produces Sex Hormone-Dependent Resilience to Stress-Induced Muscle Hyperalgesia in Rats. THE JOURNAL OF PAIN 2018; 19:670-677. [PMID: 29432863 DOI: 10.1016/j.jpain.2018.01.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 01/18/2018] [Accepted: 01/30/2018] [Indexed: 12/28/2022]
Abstract
Neonatal handling (NH) of male rat pups strongly attenuates stress response and stress-induced persistent muscle hyperalgesia in adults. Because female sex is a well established risk factor for stress-induced chronic muscle pain, we explored whether NH provides resilience to stress-induced hyperalgesia in adult female rats. Rat pups underwent NH, or standard (control) care. Muscle mechanical nociceptive threshold was assessed before and after water avoidance (WA) stress, when they were adults. In contrast to male rats, NH produced only a modest protection against WA stress-induced muscle hyperalgesia in female rats. Gonadectomy completely abolished NH-induced resilience in male rats but produced only a small increase in this protective effect in female rats. The administration of the antiestrogen drug fulvestrant, in addition to gonadectomy, did not enhance the protective effect of NH in female rats. Finally, knockdown of the androgen receptor by intrathecal antisense treatment attenuated the protective effect of NH in intact male rats. Together, these data indicate that androgens play a key role in NH-induced resilience to WA stress-induced muscle hyperalgesia. PERSPECTIVE NH induces androgen-dependent resilience to stress-induced muscle pain. Therefore, androgens may contribute to sex differences observed in chronic musculoskeletal pain and its enhancement by stress.
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Affiliation(s)
- Pedro Alvarez
- Department of Oral and Maxillofacial Surgery, University of California, San Francisco, California; Division of Neuroscience, University of California, San Francisco, California
| | - Paul G Green
- Division of Neuroscience, University of California, San Francisco, California; Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, California
| | - Jon D Levine
- Department of Oral and Maxillofacial Surgery, University of California, San Francisco, California; Division of Neuroscience, University of California, San Francisco, California; Department of Medicine, University of California, San Francisco, California.
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15
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Schertzinger M, Wesson-Sides K, Parkitny L, Younger J. Daily Fluctuations of Progesterone and Testosterone Are Associated With Fibromyalgia Pain Severity. THE JOURNAL OF PAIN 2017; 19:410-417. [PMID: 29248511 DOI: 10.1016/j.jpain.2017.11.013] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 11/09/2017] [Accepted: 11/28/2017] [Indexed: 02/07/2023]
Abstract
The purpose of this longitudinal blood sampling study was to examine relationships between sex hormones and fibromyalgia pain. Eight women meeting case definition criteria for fibromyalgia provided venous blood samples and reported their fibromyalgia pain severity over 25 consecutive days. All women exhibited normal menstrual cycles and were not taking oral contraceptives. Cortisol, and the sex hormones estradiol, progesterone, and testosterone, were assayed from serum. A linear mixed model was used to determine if fluctuations of sex hormones were associated with changes in pain severity. In the entire sample, day to day changes in progesterone (P = .002) as well as testosterone (P = .015) were significantly and inversely correlated with pain severity. There was no relationship between estradiol and pain (P = .551) or cortisol and pain (P = .633). These results suggest that progesterone and testosterone play a protective role in fibromyalgia pain severity. Sex and other hormones may serve to increase as well as decrease fibromyalgia pain severity. PERSPECTIVE Sex hormones fluctuate normally in women with fibromyalgia, but may still contribute to pain severity.
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Affiliation(s)
| | - Kate Wesson-Sides
- University of Alabama at Birmingham, Department of Psychology, Birmingham, Alabama
| | - Luke Parkitny
- University of Alabama at Birmingham, Department of Psychology, Birmingham, Alabama
| | - Jarred Younger
- University of Alabama at Birmingham, Department of Psychology, Birmingham, Alabama.
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16
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Mechanisms involved in antinociception induced by a polysulfated fraction from seaweed Gracilaria cornea in the temporomandibular joint of rats. Int J Biol Macromol 2017; 97:76-84. [PMID: 28065754 DOI: 10.1016/j.ijbiomac.2017.01.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 12/17/2016] [Accepted: 01/04/2017] [Indexed: 01/28/2023]
Abstract
Temporomandibular disorder is a common clinical condition involving pain in the temporomandibular joint (TMJ) region. This study assessed the antinociceptive effects of a polysulfated fraction from the red seaweed Gracilaria cornea (Gc-FI) on the formalin-induced TMJ hypernociception in rats and investigated the involvement of different mechanisms. Male Wistar rats were pretreated with injection (sc) of saline or Gc-FI 1h before intra- TMJ injection of formalin to evaluate the nociception. The results showed that pretreatment with Gc-FI significantly reduced formalin-induced nociceptive behavior. Moreover, the antinociceptive effect of the Gc-FI was blocked by naloxone (a non-selective opioid antagonist), suggesting the involvement of opioids selective receptors. Thus, the pretreatment with selective opioids receptors antagonists, reversed the antinociceptive effect of the Gc-FI in the TMJ. The Gc-FI antinociceptive effect depends on the nitric oxide/cyclic GMP/protein kinase G/ATP-sensitive potassium channel (NO/cGMP/PKG/K+ATP) pathway because it was prevented by pretreatment with inhibitors of nitric oxide synthase, guanylate cyclase enzyme, PKG and a K+ATP blocker. In addition, after inhibition with a specific heme oxygenase-1 (HO-1) inhibitor, the antinociceptive effect of the Gc-FI was not observed. Collectively, these data suggest that the antinociceptive effect induced by Gc-FI is mediated by μ/δ/κ-opioid receptors and by activation NO/cGMP/PKG/K+ATP channel pathway, besides of HO-1.
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Activational action of testosterone on androgen receptors protects males preventing temporomandibular joint pain. Pharmacol Biochem Behav 2016; 152:30-35. [PMID: 27461546 DOI: 10.1016/j.pbb.2016.07.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 06/30/2016] [Accepted: 07/22/2016] [Indexed: 01/31/2023]
Abstract
BACKGROUND Testosterone protects male rats from Temporomandibular Joint (TMJ) pain. This study investigated whether this protective effect is mediated by an organizational action of testosterone during nervous system development, by central estrogen and androgen receptors and by the 5α-reduced metabolite of testosterone, dihydrotestosterone. METHODS A pharmacological approach was used to assess the ability of the androgen receptor antagonist flutamide, the estrogen receptor antagonist ICI 182 780 and the 5-α reductase inhibitor dutasteride to block the protective effect of testosterone, evaluated through the behavioral response induced by a TMJ injection of 0.5% formalin. Flutamide and ICI 182 780 were injected into the medullary subarachnoid space, and dutasteride and testosterone were systemically administered. RESULTS The TMJ injection of 0.5% formalin induced a significant nociceptive behavioral response in gonadectomized male and naïve female, but not in sham gonadectomized male rats, confirming that endogenous testosterone prevents TMJ nociception in males. Testosterone administration prevented formalin-induced TMJ nociception in males gonadectomized either in the neonatal (at the day of birth) or adult period and in naïve female rats, suggesting that the protective effect of testosterone on TMJ nociception does not depend on its organizational actions during critical periods of development. The administration of flutamide and dutasteride but not of ICI 182 780 blocked the protective effect of testosterone. CONCLUSIONS We conclude that the protective effect of testosterone on TMJ nociception depends on activational actions of dihydrotestosterone on androgen receptors rather than on organizational androgenic actions during central nervous system development or estrogenic actions.
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