ArticleMagnetic resonance imaging2026
Role of GIRK2 channels in morphine-induced metabolite changes in the rostral ventromedial medulla.
Article in Magnetic resonance imaging, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThe rostral ventromedial medulla (RVM) is a brainstem structure that integrates descending modulatory signaling and contains neurons highly responsive to opioid receptor activation. Despite the well-established effects of opioids in the RVM, the neurochemical adaptations following sustained morphine exposure remain poorly understood. In particular, the contribution of G-protein-coupled inwardly rectifying potassium type 2 (GIRK2) channels, key mediators of opioid receptor-dependent antinociception has not been fully characterized. We hypothesized that GIRK2 channels are essential for morphine-induced metabolic alterations in the RVM.
methodsIn vivo proton nuclear magnetic resonance spectroscopy (
resultsIn wild-type mice, morphine exposure significantly increased levels of phosphocreatine, total creatine, glutamine, glutathione, taurine, and glycerophosphocholine plus phosphocholine (GPC + PCh), while decreasing N-acetylaspartate (NAA). These changes suggest enhanced energy storage, activation of antioxidant pathways, increased membrane turnover, and alterations in neuronal integrity and excitatory neurotransmission. In contrast, GIRK2
conclusionThese findings identify the GIRK2 channel as an important modulator of morphine-induced metabolic changes in the RVM. The observed neurochemical alterations likely reflect adaptive responses to sustained opioid exposure.
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