Abstract
Functional variations in cerebral cortical activity are accompanied by local changes in blood flow, but the mechanisms underlying this physiological coupling are not well understood. Here we report that dopamine, a neurotransmitter normally associated with neuromodulatory actions, may directly affect local cortical blood flow. Using light and electron-microscopic immunocytochemistry, we show that dopaminergic axons innervate the intraparenchymal microvessels. We also provide evidence in an in vitro slice preparation that dopamine produces vasomotor responses in the cortical vasculature. These anatomical and physiological observations reveal a previously unknown source of regulation of the microvasculature by dopamine. The findings may be relevant to the mechanisms underlying changes in blood flow observed in circulatory and neuropsychiatric disorders.
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Acknowledgements
We thank Klara Szigeti for preparing tissue for electron microscopy, and David McCormick for providing us with ferret frontal cortex for the physiological experiments. This work was supported by MH44866 and a Pfizer Postdoctoral Fellowship to ECM.
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Krimer, L., Muly, E., Williams, G. et al. Dopaminergic regulation of cerebral cortical microcirculation. Nat Neurosci 1, 286–289 (1998). https://doi.org/10.1038/1099
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DOI: https://doi.org/10.1038/1099
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