ArticleNeuropsychopharmacology : official publication of the American College of Neuropsychopharmacology2025
Ketamine-induced static and dynamic functional connectivity changes are modulated by opioid receptors and biological sex in rats.
Article in Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers, 1 of them a synthesis that pooled it.
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Who cites it
4 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Is the antidepressant efficacy of ketamine and esketamine mediated via opioid mechanisms?European psychiatry : the journal of the Association of European Psychiatrists · 2026Pooled it
- Bayesian-enhanced closed-loop optimization of ultrasound protocols for targeted and precise neuromodulation.bioRxiv : the preprint server for biology · 2026Article
- Opioid-specific brain connectivity dynamics distinguish analgesia from secondary effects: Studies in male mice.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Network pharmacology of cellular targets in major depressive disorder and differential mechanisms of fluoxetine, ketamine and esketamine.Computational and structural biotechnology journal · 2026Article
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Authors and funding
4 authors.
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Abstract
Subanesthetic ketamine is currently used as a rapid-acting treatment for varied neuropsychiatric disorders. However, the mechanistic underpinnings of its therapeutic action remain unclear, and emerging clinical and preclinical evidence highlights a potential involvement of the opioid system. We used pharmacological functional ultrasound imaging data acquired during and after ketamine administration in male and female rats pretreated with naltrexone, an opioid receptor antagonist, or vehicle. We found that ketamine-induced functional connectivity changes are modulated by opioid receptor blockade, and that these responses are dependent on biological sex. Specifically, naltrexone sex-dependently altered the connectivity patterns within the medial prefrontal cortex (mPFC), a key node of the brain's default-mode network, and between the mPFC and other functional nodes. Furthermore, ketamine produced an opioid-dependent shift toward states of increased dysconnectivity and brain entropy in male rats only. Our findings warrant further investigation into the neurophysiological underpinnings of ketamine action and potential sex-specific interactions with opioid receptors.
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