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Otis C, Bouet E, Keita-Alassane S, Frezier M, Delsart A, Guillot M, Bédard A, Pelletier JP, Martel-Pelletier J, Lussier B, Beaudry F, Troncy E. Face and Predictive Validity of MI-RAT ( Montreal Induction of Rat Arthritis Testing), a Surgical Model of Osteoarthritis Pain in Rodents Combined with Calibrated Exercise. Int J Mol Sci 2023; 24:16341. [PMID: 38003530 PMCID: PMC10671647 DOI: 10.3390/ijms242216341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 11/02/2023] [Accepted: 11/13/2023] [Indexed: 11/26/2023] Open
Abstract
Validating animal pain models is crucial to enhancing translational research and response to pharmacological treatment. This study investigated the effects of a calibrated slight exercise protocol alone or combined with multimodal analgesia on sensory sensitivity, neuroproteomics, and joint structural components in the MI-RAT model. Joint instability was induced surgically on day (D) 0 in female rats (N = 48) distributed into sedentary-placebo, exercise-placebo, sedentary-positive analgesic (PA), and exercise-PA groups. Daily analgesic treatment (D3-D56) included pregabalin and carprofen. Quantitative sensory testing was achieved temporally (D-1, D7, D21, D56), while cartilage alteration (modified Mankin's score (mMs)) and targeted spinal pain neuropeptide were quantified upon sacrifice. Compared with the sedentary-placebo (presenting allodynia from D7), the exercise-placebo group showed an increase in sensitivity threshold (p < 0.04 on D7, D21, and D56). PA treatment was efficient on D56 (p = 0.001) and presented a synergic anti-allodynic effect with exercise from D21 to D56 (p < 0.0001). Histological assessment demonstrated a detrimental influence of exercise (mMs = 33.3%) compared with sedentary counterparts (mMs = 12.0%; p < 0.001), with more mature transformations. Spinal neuropeptide concentration was correlated with sensory sensitization and modulation sites (inflammation and endogenous inhibitory control) of the forced mobility effect. The surgical MI-RAT OA model coupled with calibrated slight exercise demonstrated face and predictive validity, an assurance of higher clinical translatability.
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Affiliation(s)
- Colombe Otis
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ), Department of Biomedical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (C.O.); (E.B.); (S.K.-A.); (M.F.); (A.D.); (M.G.); (B.L.); (F.B.)
| | - Emilie Bouet
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ), Department of Biomedical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (C.O.); (E.B.); (S.K.-A.); (M.F.); (A.D.); (M.G.); (B.L.); (F.B.)
| | - Sokhna Keita-Alassane
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ), Department of Biomedical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (C.O.); (E.B.); (S.K.-A.); (M.F.); (A.D.); (M.G.); (B.L.); (F.B.)
| | - Marilyn Frezier
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ), Department of Biomedical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (C.O.); (E.B.); (S.K.-A.); (M.F.); (A.D.); (M.G.); (B.L.); (F.B.)
| | - Aliénor Delsart
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ), Department of Biomedical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (C.O.); (E.B.); (S.K.-A.); (M.F.); (A.D.); (M.G.); (B.L.); (F.B.)
| | - Martin Guillot
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ), Department of Biomedical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (C.O.); (E.B.); (S.K.-A.); (M.F.); (A.D.); (M.G.); (B.L.); (F.B.)
| | - Agathe Bédard
- Charles River Laboratories Montreal ULC, Senneville, QC H9X 1C1, Canada;
| | - Jean-Pierre Pelletier
- Osteoarthritis Research Unit, Université de Montréal Hospital Research Center (CRCHUM), Montréal, QC H2X 0A9, Canada; (J.-P.P.); (J.M.-P.)
| | - Johanne Martel-Pelletier
- Osteoarthritis Research Unit, Université de Montréal Hospital Research Center (CRCHUM), Montréal, QC H2X 0A9, Canada; (J.-P.P.); (J.M.-P.)
| | - Bertrand Lussier
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ), Department of Biomedical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (C.O.); (E.B.); (S.K.-A.); (M.F.); (A.D.); (M.G.); (B.L.); (F.B.)
- Osteoarthritis Research Unit, Université de Montréal Hospital Research Center (CRCHUM), Montréal, QC H2X 0A9, Canada; (J.-P.P.); (J.M.-P.)
| | - Francis Beaudry
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ), Department of Biomedical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (C.O.); (E.B.); (S.K.-A.); (M.F.); (A.D.); (M.G.); (B.L.); (F.B.)
- Osteoarthritis Research Unit, Université de Montréal Hospital Research Center (CRCHUM), Montréal, QC H2X 0A9, Canada; (J.-P.P.); (J.M.-P.)
- Centre de Recherche sur le Cerveau et L’Apprentissage (CIRCA), Université de Montréal, Montréal, QC H3T 1P1, Canada
| | - Eric Troncy
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ), Department of Biomedical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (C.O.); (E.B.); (S.K.-A.); (M.F.); (A.D.); (M.G.); (B.L.); (F.B.)
- Osteoarthritis Research Unit, Université de Montréal Hospital Research Center (CRCHUM), Montréal, QC H2X 0A9, Canada; (J.-P.P.); (J.M.-P.)
- Centre de Recherche sur le Cerveau et L’Apprentissage (CIRCA), Université de Montréal, Montréal, QC H3T 1P1, Canada
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Bodnar RJ. Endogenous opiates and behavior: 2022. Peptides 2023; 169:171095. [PMID: 37704079 DOI: 10.1016/j.peptides.2023.171095] [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: 08/22/2023] [Revised: 09/06/2023] [Accepted: 09/07/2023] [Indexed: 09/15/2023]
Abstract
This paper is the forty-fifth consecutive installment of the annual anthological review of research concerning the endogenous opioid system, summarizing articles published during 2022 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides and receptors as well as effects of opioid/opiate agonists and antagonists. The review is subdivided into the following specific topics: molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors (1), the roles of these opioid peptides and receptors in pain and analgesia in animals (2) and humans (3), opioid-sensitive and opioid-insensitive effects of nonopioid analgesics (4), opioid peptide and receptor involvement in tolerance and dependence (5), stress and social status (6), learning and memory (7), eating and drinking (8), drug abuse and alcohol (9), sexual activity and hormones, pregnancy, development and endocrinology (10), mental illness and mood (11), seizures and neurologic disorders (12), electrical-related activity and neurophysiology (13), general activity and locomotion (14), gastrointestinal, renal and hepatic functions (15), cardiovascular responses (16), respiration and thermoregulation (17), and immunological responses (18).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, Flushing, NY 11367, USA.
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Chen Y, Han Y, Liu L, Liu M, Lin J, Tang Y, Guo S, He R, Wu Q. N 6-Methyladenosine methylase METTL3 contributes to neuropathic pain by epigenetic silencing of mu opioid receptor. Behav Brain Res 2023; 452:114592. [PMID: 37482304 DOI: 10.1016/j.bbr.2023.114592] [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: 04/25/2023] [Revised: 07/02/2023] [Accepted: 07/20/2023] [Indexed: 07/25/2023]
Abstract
We aimed at exploring the role and mechanism of METTL3-mediated m6A modification in neuropathic pain. Male Sprague-Dawley rats were randomly divided into four groups: Sham operation group (Sham group), chronic constriction injury (CCI) of the sciatic nerve model group (NPP group), intrathecal injection of virus down-regulated METTL3 + CCI model group (M3 + NPP group) and intrathecal injection of negative control virus + CCI model group (Scr + NPP group). The M3 + NPP group and the Scr + NPP group were intrathecally injected with virus nineteen days before operation. The paw withdrawal mechanical thresholds and paw withdrawal latency were respectively recorded one day before operation, three days, five days and seven days after operation. The rats were sacrificed on the seventh day after operation, and their spinal cord tissues were taken. The frozen sections of rats were performed to observe the expression of green fluorescent protein of the virus. The methylation level of RNA, the protein expression of m6A-related enzyme (METTL3) and mu opioid receptor (MOR) in spinal cord tissues of the four groups were measured. Downregulation of METTL3 had no effect on the overall methylation level of the spinal cord, but it could regulate the methylation level of the OPRM1 gene RNA encoding MOR, partially restore the expression of MOR, and relieve pain in rats. In the process of NPP, METTL3 may inhibit the expression of MOR by regulating the methylation level of OPRM1 gene RNA encoding MOR, and ultimately promote the occurrence and development of NPP.
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Affiliation(s)
- Yao Chen
- Department of Anesthsiology, National Clinical Research Center for Infectious Diseases, Shenzhen Third People's Hospital, Shenzhen, Guangdong 518112, China
| | - Yakun Han
- Department of Anesthsiology, National Clinical Research Center for Infectious Diseases, Shenzhen Third People's Hospital, Shenzhen, Guangdong 518112, China
| | - Li Liu
- Department of Anesthsiology, National Clinical Research Center for Infectious Diseases, Shenzhen Third People's Hospital, Shenzhen, Guangdong 518112, China
| | - Minqiang Liu
- Department of Anesthsiology, National Clinical Research Center for Infectious Diseases, Shenzhen Third People's Hospital, Shenzhen, Guangdong 518112, China
| | - Jing Lin
- Central Sterile Supply Department, National Clinical Research Center for Infectious Diseases, Shenzhen Third People's Hospital, Shenzhen, Guangdong 518112, China
| | - Yi Tang
- Department of Anesthsiology, National Clinical Research Center for Infectious Diseases, Shenzhen Third People's Hospital, Shenzhen, Guangdong 518112, China
| | - Shanshan Guo
- Department of Anesthsiology, National Clinical Research Center for Infectious Diseases, Shenzhen Third People's Hospital, Shenzhen, Guangdong 518112, China
| | - Renliang He
- Department of Anesthsiology, National Clinical Research Center for Infectious Diseases, Shenzhen Third People's Hospital, Shenzhen, Guangdong 518112, China.
| | - Qiang Wu
- Department of Anesthsiology, National Clinical Research Center for Infectious Diseases, Shenzhen Third People's Hospital, Shenzhen, Guangdong 518112, China.
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Hassan GS, Helal MB, Ibrahim HF. Immunohistochemical expression of estrogen receptor alpha in the maxillary sinus, pulp, and periodontal ligament of adjacent teeth in late pregnancy in rats. Odontology 2023; 111:608-617. [PMID: 36434465 PMCID: PMC10238294 DOI: 10.1007/s10266-022-00770-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 11/15/2022] [Indexed: 11/27/2022]
Abstract
This study aimed to assess the histological changes in the maxillary sinus and its adjacent dental tissues as pulp and periodontal ligament during pregnancy and investigate the role of estrogen hormone in these changes through the detection of estrogen receptors in these tissues. Sixteen adult female rats were used and were allocated into two groups: control non-pregnant (n = 8) and pregnant (n = 8). They were sacrificed and their heads were prepared for histological and immunohistochemical examination for estrogen receptor alpha. Our results revealed that pregnant rats revealed inflammatory changes in the sinus as thick epithelial lining, loss of cilia, swollen goblet cells, intraepithelial and interstitial edema. The lamina propria demonstrated considerable infiltration of inflammatory cells, glandular hyperplasia with vacuolar degeneration, and vascular congestion. Periodontal ligament and pulp revealed hyperemia and vascular congestion. Immunohistochemical examination of estrogen receptor alpha in the maxillary sinus and adjacent dental tissues (Periodontal ligament and pulp) in pregnant rats revealed a significant increase in its expression in all examined tissues. In conclusion, there was an increase in expression of ERα in the sinus mucosa and dental tissues during pregnancy together with slight inflammatory changes in these tissues. Hence, dentists should be aware of the effect of these changes on the pregnant women avoiding teeth extraction due to misdiagnosis of dental, periodontal or sinus pain after exclusion of true pathologies.
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Affiliation(s)
- Gihan S. Hassan
- Faculty of Dentistry, Tanta University, El-Giesh St., Tanta, Gharbia Egypt
| | - Mai B. Helal
- Faculty of Dentistry, Tanta University, El-Giesh St., Tanta, Gharbia Egypt
| | - H. F. Ibrahim
- Faculty of Dentistry, Tanta University, El-Giesh St., Tanta, Gharbia Egypt
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