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Detection of the inhibitory neurotransmitter GABA in macrophages by magnetic resonance spectroscopy

Stuckey, D.J., Anthony, D.C., Lowe, J.P., Miller, J., Palm, W.M., Styles, P., Perry, V.H., Blamire, A.M. and Sibson, N.R. (2005) Detection of the inhibitory neurotransmitter GABA in macrophages by magnetic resonance spectroscopy Journal of Leukocyte Biology, 78, (2), pp. 393-400. (doi:10.1189/jlb.1203604).

Record type: Article

Abstract

Macrophages are key components of the inflammatory response to tissue injury, but their activities can exacerbate neuropathology. High-resolution magnetic resonance spectroscopy was used to identify metabolite levels in perchloric acid extracts of cultured cells of the RAW 264.7 murine macrophage line under resting and lipopolysaccharide-activated conditions. Over 25 metabolites were identified including {gamma}-aminobutyric acid (GABA), an inhibitory neurotransmitter not previously reported to be present in macrophages. The presence of GABA was also demonstrated in extracts of human peripheral blood monocyte-derived macrophages. This finding suggests that there may be communication between damaged central nervous system (CNS) tissue and recruited macrophages and resident microglia, which could help orchestrate the immune response. On activation, lactate, glutamine, glutamate, and taurine levels were elevated significantly, and GABA and alanine were reduced significantly. Strong resonances from glutathione, evident in the macrophage two-dimensional 1H spectrum, suggest that this may have potential as a noninvasive marker of macrophages recruited to the CNS, as it is only present at low levels in normal brain. Alternatively, a specific combination of spectroscopic changes, such as lactate, alanine, glutathione, and polyamines, may prove to be the most accurate means of detecting macrophage recruitment to the CNS.

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Published date: 1 August 2005
Keywords: inflammation, MRS, mouse, brain

Identifiers

Local EPrints ID: 56193
URI: http://eprints.soton.ac.uk/id/eprint/56193
ISSN: 0741-5400
PURE UUID: 04806d1b-4189-4b2b-91c1-b1424c210320

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Date deposited: 08 Aug 2008
Last modified: 17 Jul 2017 14:31

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Contributors

Author: D.J. Stuckey
Author: D.C. Anthony
Author: J.P. Lowe
Author: J. Miller
Author: W.M. Palm
Author: P. Styles
Author: V.H. Perry
Author: A.M. Blamire
Author: N.R. Sibson

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