Dopamine and noradrenaline control distinct functions in rodent microglial cells

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Item Type:	Article
Title:	Dopamine and noradrenaline control distinct functions in rodent microglial cells
Creators Name:	Faerber, K., Pannasch, U. and Kettenmann, H.
Abstract:	Microglial cells are the immune-competent elements of the brain. They not only express receptors for chemokines and cytokines but also for neurotransmitters such as GABA [Charles et al., Mol. Cell Neurosci. 24 (2003)214], glutamate [(Noda et al., J. Neurosci. 20 (2000) 251], and adrenaline [Mori et al., Neuropharmacology 43 (2002) 1026]. Here we report the functional expression of dopamine receptors in mouse and rat microglia, in culture and brain slices. Using the patch clamp technique as the functional assay we identified D1- and D2-like dopamine receptors using subtype-specific ligands. They triggered the inhibition of the constitutive potassium inward rectifier and activated potassium outward currents in a subpopulation of microglia. Chronic dopamine receptor stimulation enhanced migratory activity and attenuated the lipopolysaccharide (LPS)-induced nitric oxide (NO) release similar as by stimulation of adrenergic receptors. While, however, noradrenaline attenuated the LPS-induced release of TNF-alpha and IL-6, dopamine was ineffective in modulating this response. We conclude that microglia express dopamine receptors which are distinct in function from adrenergic receptors.
Keywords:	Adrenergic Agonists, Alpha Adrenergic Receptors, Beta Adrenergic Receptors, Cell Movement, Cultured Cells, Cytokines, Dopamine, Dopamine D1 Receptors, Dopamine D2 Receptors, Inbred Strains Mice, Lipopolysaccharides, Membrane Potentials, Messenger RNA, Microglia, Nitric Oxide, Norepinephrine, Organ Culture Techniques, Patch-Clamp Techniques, Rats Potassium, Sympathomimetics, Wistar Rats, Animals, Mice
Source:	Molecular and Cellular Neuroscience
ISSN:	1044-7431
Publisher:	Academic Press
Volume:	29
Number:	1
Page Range:	128-138
Date:	1 January 2005
Official Publication:	https://doi.org/10.1016/j.mcn.2005.01.003
PubMed:	View item in PubMed

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