ReviewFrontiers in systems neuroscience2022
Endogenous opioid systems alterations in pain and opioid use disorder.
Review in Frontiers in systems neuroscience, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 43 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
43 citing papers in PubMed, 78 citations in OpenAlex.
- An opioid-withholding human laboratory paradigm during opioid agonist treatment for opioid use disorder and chronic pain: Phase- and dose-dependent effects of cannabidiol.Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2026Trial
- Opioids diminish the placebo antidepressant response: Observational post hoc findings from a randomized controlled ketamine trial.Journal of affective disorders · 2025Trial
- Genetic Architecture of Addiction-Relevant Behaviors in Outbred Sprague-Dawley Rats Reveals Loci for Anxiety-Like and Nociceptive Traits.Genes, brain, and behavior · 2026Article
- β-casomorphin-7: a review of occurrence, identification, techno-functionality, and effects on human health.NPJ science of food · 2026Review
- Genetic Architecture of Addiction-Relevant Behaviors in Outbred Sprague-Dawley Rats Reveals Loci for Anxiety-Like and Nociceptive Traits.bioRxiv : the preprint server for biology · 2026Article
- Pain medication and nerve injuries in upper or lower limb-a Swedish national registry study.Pain reports · 2026Article
- Molecular and Cellular Mechanism of Acupuncture: Neuro-Immune Interactions Based on Endogenous Opioid System.Chinese journal of integrative medicine · 2026Review
- Positive Emotion Regulation in Addiction: A New Frontier for Recovery Science.Current addiction reports · 2026Review
- Clinical study on the therapeutic effect of large-area cupping therapy for lumbar disc herniation of cold-damp type (a Traditional Chinese Medicine syndrome).Frontiers in medicine · 2026Article
- Mu-opioid and nociceptin receptors show divergent, cell-type-specific actions in the mesocorticolimbic reward system in opioid use disorder.Frontiers in cellular neuroscience · 2026Review
- The role of central versus peripheral opioid receptors in fentanyl-induced brain hypoxia.Journal of neurophysiology · 2026Article
- Anxiolytic and antidepressant effects of astaxanthin: behavioral and mechanistic insights in a rat model.Frontiers in pharmacology · 2026Article
- Dysregulation of Hedonic Processing in Chronic Pain: Insights from Preclinical Data.Brain sciences · 2025Review
- Casomorphine-10 (CM-10) Peptide Orchestrates Circadian and Neurodevelopmental Gene Clusters via δ-Opioid Receptor Signaling: Insights from Transcriptome Analysis with δ-Opioid Receptor-Expressing HEK293 Cells.Life (Basel, Switzerland) · 2025Article
- κ-Opioid Receptor Agonists as Robust Pain-Modulating Agents: Mechanisms and Therapeutic Potential in Pain Modulation.Journal of clinical medicine · 2025Review
- Biasing G protein βγ subunit downstream signaling enhances the analgesic effects of endogenous opioid receptor agonists during nitroglycerin-induced thermal hypersensitivity.Molecular pharmacology · 2025Article
- Effects of unpredictable chronic mild stress of female rats before pregnancy on morphine-induced antinociceptive tolerance in offspring.The Korean journal of pain · 2025Article
- Opiorphin and neuropathic pain: a promising treatment approach?Inflammopharmacology · 2025Review
- Opioid Regulation of Social Homeostasis: Connecting Loneliness to Addiction.Biological psychiatry · 2025Review
- Alcohol and cannabis use for pain management: Translational findings of relative risks, benefits, and interactions.Physiology & behavior · 2025Review
Corrections and comments
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
Abstract
Decades of research advances have established a central role for endogenous opioid systems in regulating reward processing, mood, motivation, learning and memory, gastrointestinal function, and pain relief. Endogenous opioid systems are present ubiquitously throughout the central and peripheral nervous system. They are composed of four families, namely the μ (MOPR), κ (KOPR), δ (DOPR), and nociceptin/orphanin FQ (NOPR) opioid receptors systems. These receptors signal through the action of their endogenous opioid peptides β-endorphins, dynorphins, enkephalins, and nociceptins, respectfully, to maintain homeostasis under normal physiological states. Due to their prominent role in pain regulation, exogenous opioids-primarily targeting the MOPR, have been historically used in medicine as analgesics, but their ability to produce euphoric effects also present high risks for abuse. The ability of pain and opioid use to perturb endogenous opioid system function, particularly within the central nervous system, may increase the likelihood of developing opioid use disorder (OUD). Today, the opioid crisis represents a major social, economic, and public health concern. In this review, we summarize the current state of the literature on the function, expression, pharmacology, and regulation of endogenous opioid systems in pain. Additionally, we discuss the adaptations in the endogenous opioid systems upon use of exogenous opioids which contribute to the development of OUD. Finally, we describe the intricate relationship between pain, endogenous opioid systems, and the proclivity for opioid misuse, as well as potential advances in generating safer and more efficient pain therapies.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.