ArticleAmerican journal of nuclear medicine and molecular imaging2016
PET imaging reveals sex differences in kappa opioid receptor availability in humans, in vivo.
Article in American journal of nuclear medicine and molecular imaging, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 41 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
41 citing papers in PubMed, 58 citations in OpenAlex.
- Analgesic effect of oral paracetamol 1000 mg/ibuprofen 400 mg, paracetamol 1000 mg/codeine 60 mg, paracetamol 1000 mg/ibuprofen 400 mg/codeine 60 mg, or placebo on acute postoperative pain: a single-dose, randomized, and double-blind study.European journal of clinical pharmacology · 2023Trial
- The Role of Kappa-Opioid Receptor/Dynorphin System in Modulating Neural-Circuits of Depression and Anxiety-A Review.Journal of cellular and molecular medicine · 2026Review
- Effects of Long-Term Cocaine Self-Administration on Kappa Opioid Receptors in Socially Housed Cynomolgus Monkeys as Assessed With Positron Emission Tomography Imaging and Neuronally Derived Exosomes.Biological psychiatry · 2025Article
- The ultrasonic vocalization (USV) syllable profile during neonatal opioid withdrawal and a kappa opioid receptor component to increased USV emissions in female mice.Psychopharmacology · 2025Article
- Acute Stress Increases Striatal Connectivity With Cortical Regions Enriched for μ and κ Opioid Receptors.Biological psychiatry · 2024Article
- Self-regulated analgesia in males but not females is mediated by endogenous opioids.PNAS nexus · 2024Article
- The ultrasonic vocalization (USV) syllable profile during neonatal opioid withdrawal and a kappa opioid receptor component to increased USV emissions in female mice.bioRxiv : the preprint server for biology · 2024Article
- Sex Differences in Brain Region-Specific Activation of c-Fos following Kappa Opioid Receptor Stimulation or Acute Stress in Mice.International journal of molecular sciences · 2023Article
- Pain-related cortico-limbic plasticity and opioid signaling.Neuropharmacology · 2023Review
- Delay discounting as a behavioral phenotype associated with social rank in female and male cynomolgus monkeys: Correlation with kappa opioid receptor availability.Pharmacology, biochemistry, and behavior · 2023Article
- PET imaging of kappa opioid receptors and receptor expression quantified in neuron-derived extracellular vesicles in socially housed female and male cynomolgus macaques.Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2023Article
- Sex specific effects of buprenorphine on behavior, astrocytic opioid receptor expression and neuroinflammation after pediatric traumatic brain injury in mice.Brain, behavior, & immunity - health · 2022Article
- Dynorphin/Kappa Opioid Receptor Activity Within the Extended Amygdala Contributes to Stress-Enhanced Alcohol Drinking in Mice.Biological psychiatry · 2022Article
- Kappa-Opioid Receptor Blockade Ameliorates Obesity Caused by Estrogen Withdrawal via Promotion of Energy Expenditure through mTOR Pathway.International journal of molecular sciences · 2022Article
- An updated assessment of the translational promise of G-protein-biased kappa opioid receptor agonists to treat pain and other indications without debilitating adverse effects.Pharmacological research · 2022Review
- The Role of Dynorphin and the Kappa Opioid Receptor in Schizophrenia and Major Depressive Disorder: A Translational Approach.Handbook of experimental pharmacology · 2022Review
- Sex differences in kappa opioid receptor antinociception is influenced by the number of X chromosomes in mouse.Journal of neuroscience research · 2022Article
- KOR Control over Addiction Processing: An Exploration of the Mesolimbic Dopamine Pathway.Handbook of experimental pharmacology · 2022Article
- Kappa Opioid Signaling at the Crossroads of Chronic Pain and Opioid Addiction.Handbook of experimental pharmacology · 2022Article
- Kappa Opioid Receptors in the Pathology and Treatment of Major Depressive Disorder.Handbook of experimental pharmacology · 2022Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
9 authors at 1 institution in 1 country.
Funding
Abstract
Opioid receptors may play critical roles in alcoholism and other addictions, addiction withdrawal, and depression and are considered pharmacological targets for treatment of these conditions. Sex differences have been demonstrated in mu (MOR) and delta (DOR) opioid receptors in humans, in vivo. In addition, sex differences have been observed in efficacy of treatment targeting kappa opioid receptors (KOR). Our goal in the present study was to compare the availability of KOR (1) between healthy control (HC) men and women. Twenty-seven subjects-18 males (M) and 9 females (F)-underwent PET scans with [(11)C] LY2795050, a selective kappa antagonist tracer. Partial volume correction was applied to all PET data. Volume of distribution (V T) of the tracer was estimated regionally as well as at the voxel level. V T values of males versus females were compared for 19 defined ROIs. Results at the regional and voxel levels were consistent. Males had significantly higher V T and thus a higher KOR availability than women in multiple brain regions. To our knowledge, this is the first report of sex differences in the KOR system in humans, in vivo. These findings could have implications for the treatment of pain with kappa opioid analgesics. The results may also have an impact on the diagnosis and treatment of addictive and other disorders.
Indexed as
Identifiers
27648372PMC5004062W2534384157What OpenQuestion holds
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.