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Seasonal variation in the brain μ-opioid receptor availability
<p>Seasonal rhythms influence emotion and sociability. The brain μ-opioid receptor (MOR) system modulates a multitude of seasonally varying socioemotional functions, but its seasonal variation remains elusive with no ...
Cerebral grey matter density is associated with neuroreceptor and neurotransporter availability: A combined PET and MRI study
<a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/positron-emission-tomography" title="Learn more about Positron emission tomography from ScienceDirect's AI-generated Topic Pages">Positron emission tomography</a> (PET) can be used for in vivo measurement of specific <a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/neuroreceptor" title="Learn more about neuroreceptors from ScienceDirect's AI-generated Topic Pages">neuroreceptors</a> and transporters using <a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/radioligand" title="Learn more about radioligands from ScienceDirect's AI-generated Topic Pages">radioligands</a>, while voxel-based morphometric analysis of magnetic resonance images allows automated estimation of local grey matter densities. However, it is not known how regional neuroreceptor or transporter densities are reflected in grey matter densities. Here, we analyzed <a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/brain-scintiscanning" title="Learn more about brain scans from ScienceDirect's AI-generated Topic Pages">brain scans</a> retrospectively from 328 subjects and compared grey matter density estimates with neuroreceptor and transporter availabilities. µ-opioid receptors (MORs) were measured with [11C]carfentanil (162 scans), <a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/dopamine-receptor-d2" title="Learn more about dopamine D2 receptors from ScienceDirect's AI-generated Topic Pages">dopamine D2 receptors</a> with [11C]raclopride (92 scans) and <a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/serotonin-transporter" title="Learn more about serotonin transporters from ScienceDirect's AI-generated Topic Pages">serotonin transporters</a> (SERT) with [11C]MADAM (74 scans). The PET data were modelled with simplified reference tissue model. Voxel-wise correlations between binding potential and grey matter density images were computed. Regional binding of all the used <a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/radioactive-tracer" title="Learn more about radiotracers from ScienceDirect's AI-generated Topic Pages">radiotracers</a> was associated with grey matter density in region and ligand-specific manner independently of subjects’ age or sex. These data show that grey matter density and MOR and D2R neuroreceptor / SERT availability are correlated, with effect sizes (r2) ranging from 0.04 to 0.69. This suggests that future studies comparing PET outcome measure different groups (such as patients and controls) should also analyze interactive effects of grey matter density and PET outcome measures....
Opioid Release after High-Intensity Interval Training in Healthy Human Subjects
Central opioidergic mechanisms may modulate the positive effects of physical exercise such as mood elevation and stress reduction. How exercise intensity and concomitant effective changes affect central opioidergic responses ...
Interindividual variability and lateralization of mu-opioid receptors in the human brain
Alterations in the brain's mu-opioid receptor (MOR) system have been associated with several neuropsychiatric disorders. Central MOR availability also varies considerably in healthy individuals. Multiple epidemiological ...
Systemic cross-talk between brain, gut, and peripheral tissues in glucose homeostasis: effects of exercise training (CROSSYS). Exercise training intervention in monozygotic twins discordant for body weight
Background: Obesity and physical inactivity are major global public health concerns, both of which increase the risk of insulin resistance and type 2 diabetes. Regulation of glucose homeostasis involves cross-talk between ...
μ-opioid receptor availability is associated with sex drive in human males
The endogenous mu-opioid receptor (MOR) system modulates a multitude of social and reward-related functions, and exogenous opiates also influence sex drive in humans and animals. Sex drive shows substantial variation across ...
Secretin activates brown fat and induces satiation
<p>Brown adipose tissue (BAT) thermogenesis is activated by feeding. Recently, we revealed a secretin-mediated gut–BAT–brain axis, which stimulates satiation in mice, but the purpose of meal-induced BAT activation in humans ...
Aerobic Fitness is Associated with Cerebral mu-Opioid Receptor Activation in Healthy Humans
<p><strong>Introduction: </strong>Central μ-opioid receptors (MORs) modulate affective responses to physical exercise. Individuals with higher aerobic fitness report greater exercise-induced mood improvements than those ...
Association of CNR1 gene and cannabinoid 1 receptor protein in the human brain
We aimed to integrate genomic mapping from brain mRNA atlas with the protein expression from positron emission tomography (PET) scans of type 1 cannabinoid (CB1) receptor and to compare the predictive power of CB1 receptor ...
Obesity risk is associated with brain glucose uptake and insulin resistance
<p><strong>Objective: </strong>To investigate whether alterations in brain glucose uptake (BGU), insulin action in the brain-liver axis and whole-body insulin sensitivity occur in young adults in pre-obese state.</p><p>< ...