Astrocytes and the regulation of cerebral blood flow

Raymond C. Koehler, Richard J. Roman, David R. Harder

Research output: Contribution to journalReview articlepeer-review

328 Scopus citations


Moment-to-moment changes in local neuronal activity lead to dynamic changes in cerebral blood flow. Emerging evidence implicates astrocytes as one of the key players in coordinating this neurovascular coupling. Astrocytes are poised to sense glutamatergic synaptic activity over a large spatial domain via activation of metabotropic glutamate receptors and subsequent calcium signaling and via energy-dependent glutamate transport. Astrocyte foot processes can signal vascular smooth muscle by arachidonic acid pathways involving astrocytic cytochrome P450 epoxygenase, astrocytic cyclooxygenase-1 and smooth muscle cytochrome P450 ω-hydroxylase activities, and by astrocytic and smooth muscle potassium channels. Non-glutamatergic transmitters released from neurons, such as nitric oxide, cyclooxygenase-2 metabolites and vasoactive intestinal peptide, might modulate neurovascular signaling at the level of the astrocyte or smooth muscle. Thus, astrocytes have a pivotal role in dynamic signaling within the neurovascular unit. Important questions remain on how this signaling is integrated with other pathways in health and disease.

Original languageEnglish (US)
Pages (from-to)160-169
Number of pages10
JournalTrends in neurosciences
Issue number3
StatePublished - Mar 2009

ASJC Scopus subject areas

  • General Neuroscience


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