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Decreased opioid receptor availability and impaired neurometabolic coupling as signatures of morphine tolerance in male rats: A positron emission tomography study.
Biomed Pharmacother
January 2025
Laboratoire d'Imagerie Biomédicale Multimodale (BioMaps), CEA, CNRS, Inserm, Service Hospitalier Frédéric Joliot, Université Paris-Saclay, Orsay, France. Electronic address:
Translational neuroimaging techniques are needed to address the impact of opioid tolerance on brain function and quantitatively monitor the impaired neuropharmacological response to opioids at the CNS level. A multiparametric PET study was conducted in rats. Rats received morphine daily to induce tolerance (15 mg/kg/day for 5 days), followed by 2-day withdrawal.
View Article and Find Full Text PDFAtp1a2 and Kcnj9 Are Candidate Genes Underlying Sensitivity to Oxycodone-Induced Locomotor Activation and Withdrawal-Induced Anxiety-Like Behaviors in C57BL/6 Substrains.
Genes Brain Behav
February 2025
Laboratory of Addiction Genetics, Department of Pharmaceutical Sciences and Center for Drug Discovery, Northeastern University, Boston, Massachusetts, USA.
Opioid use disorder is heritable, yet its genetic etiology is largely unknown. C57BL/6J and C57BL/6NJ mouse substrains exhibit phenotypic diversity in the context of limited genetic diversity which together can facilitate genetic discovery. Here, we found C57BL/6NJ mice were less sensitive to oxycodone (OXY)-induced locomotor activation versus C57BL/6J mice in a conditioned place preference paradigm.
View Article and Find Full Text PDFIncidence of alternative splicing associated with sex and opioid effects in the axon guidance pathway.
Gene
January 2025
Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA; Informatics Program, University of Illinois at Urbana-Champaign, Urbana, IL 61820 USA; Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA; Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA; Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA; Department of Statistics, University of Illinois at Urbana-Champaign, Urbana, IL 61820 USA. Electronic address:
The alternative splicing of a gene results in distinct transcript isoforms that can result in proteins that differ in function. Alternative splicing processes are prevalent in the brain, have varying incidence across brain regions, and can present sexual dimorphism. Exposure to opiates and other substances of abuse can also alter the type and incidence of the splicing process and the relative abundance of the isoforms produced.
View Article and Find Full Text PDFEfficacy and safety of SHR8554 on postoperative pain in subjects with moderate to severe acute pain following orthopedic surgery: A multicenter, randomized, double-blind, dose-explored, active-controlled, phase II/III clinical trial.
Pharmacol Res
January 2025
Department of Anesthesiology, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Key Laboratory of Anesthesiology (Shanghai Jiao Tong University), Ministry of Education, Shanghai, China. Electronic address:
Biased µ-opioid receptor (MOR) agonists enhance pain relief by selectively activating G protein-coupled receptor signaling and minimizing β-arrestin-2 activation, resulting in fewer side effects. This multicenter Phase II/III trial evaluated the optimal dosage, efficacy, and safety of SHR8554, a biased MOR agonist, for postoperative pain management following orthopedic surgery. In Phase II, 121 patients were divided into four groups to receive varying patient-controlled analgesia (PCA) doses of SHR8554 or morphine.
View Article and Find Full Text PDFRole of Strong Opioids in an Effective Discharge for Lower-Limb Large Joint Arthroplasty Patients: A Patient-Based Analysis.
Cureus
November 2024
Orthopaedics and Trauma, Russells Hall Hospital, Dudley, GBR.
Background/objective: Adequate postoperative analgesics are an essential element in the recovery and rehabilitation of large joint lower-limb arthroplasty patients in their acute postoperative phase. In this study, we will establish that strong opioids like morphine should be included as postoperative analgesics to improve patient satisfaction. Material: This retrospective cross-sectional study was conducted in the Arthroplasty Ward, Trauma, and Orthopaedics Department in a district general hospital of the United Kingdom.
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