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<p>Physical exercise has lasting positive influence on mental health. However, its cellular substrate remains to be elucidated. Recently, dopamine D<sub>1</sub>-like receptor activation induced by noradrenaline has been suggested to underlie exercise-dependent augmentation of antidepressant effects. The present study demonstrates that exercise induces a long-term enhancement of this atypical catecholaminergic signaling. Noradrenaline potentiates hippocampal mossy fiber synaptic transmission by activating D<sub>1</sub>-like receptors in mice. Voluntary exercise by wheel running enhanced this noradrenaline-D<sub>1</sub>-like receptor signaling within 5 days. The enhancement of the noradrenaline-D<sub>1</sub>-like receptor signaling did not require the integrity of noradrenergic fibers and was maintained for more than 2 weeks after cessation of wheel running. Notably, the effect of exercise was more robustly seen in D<sub>1</sub>-like receptor signaling activated by noradrenaline as compared with dopamine, indicating particular responsiveness of the noradrenaline-activated D<sub>1</sub>-like receptor signaling to exercise. These results suggest that exercise could exert lasting influence on brain functioning via plasticity of the hippocampal noradrenaline-D<sub>1</sub>-like receptor signaling.</p>

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Chronic voluntary exercise induces plasticity of noradrenaline-activated dopamine D1-like receptor signaling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月16日

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  • Katsunori Kobayashi

摘要

Physical exercise has lasting positive influence on mental health. However, its cellular substrate remains to be elucidated. Recently, dopamine D1-like receptor activation induced by noradrenaline has been suggested to underlie exercise-dependent augmentation of antidepressant effects. The present study demonstrates that exercise induces a long-term enhancement of this atypical catecholaminergic signaling. Noradrenaline potentiates hippocampal mossy fiber synaptic transmission by activating D1-like receptors in mice. Voluntary exercise by wheel running enhanced this noradrenaline-D1-like receptor signaling within 5 days. The enhancement of the noradrenaline-D1-like receptor signaling did not require the integrity of noradrenergic fibers and was maintained for more than 2 weeks after cessation of wheel running. Notably, the effect of exercise was more robustly seen in D1-like receptor signaling activated by noradrenaline as compared with dopamine, indicating particular responsiveness of the noradrenaline-activated D1-like receptor signaling to exercise. These results suggest that exercise could exert lasting influence on brain functioning via plasticity of the hippocampal noradrenaline-D1-like receptor signaling.