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TNF-alpha reduces cerebral blood volume and disrupts tissue homeostasis via an endothelin- and TNFR2-dependent pathway

Sibson, N.R., Blamire, A.M., Perry, V.H., Gauldie, J., Styles, P. and Anthony, D.C. (2002) TNF-alpha reduces cerebral blood volume and disrupts tissue homeostasis via an endothelin- and TNFR2-dependent pathway Brain, 125, (11), pp. 2446-2459.

Record type: Article

Abstract

TNF-alpha expression is elevated in a variety of neuropathologies, including multiple sclerosis, cerebral malaria and HIV encephalitis. However, the consequences of such high cerebral TNF-alpha expression remain unresolved. Here, using MRI, we demonstrate that a focal intrastriatal injection of TNF-alpha causes a significant, acute reduction (15-30%) in cerebral blood volume (CBV), which is dependent on TNF-alpha-type 2 receptor (TNFR2) activation, and can be ameliorated by pre-treatment with a non-specific endothelin (ET) receptor antagonist. An acute breakdown of the blood-cerebrospinal fluid barrier (B-CSF-B) and a delayed breakdown of the blood-brain barrier (BBB) were also observed using contrast-enhanced MRI. Furthermore, a significant reduction in tissue water diffusion was apparent 24 h after intrastriatal injection of TNF-alpha injection, which may indicate compromise of tissue energy metabolism. Prolonged expression of endogenous TNF-alpha, achieved through the use of an adenoviral vector expressing TNF-alpha cDNA (Ad5TNF-alpha(m)), caused a sustained depression in CBV in accordance with the single TNF-alpha bolus data. These findings identify vasoconstriction, disrupted tissue homeostasis and damage to the BBBs as adverse effects of TNF-alpha within the brain, and suggest that antagonists of the endothelin and TNF-alpha type 2 receptors may be therapeutic in TNF-alpha-associated neuropathologies.

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Published date: 1 November 2002

Identifiers

Local EPrints ID: 56074
URI: http://eprints.soton.ac.uk/id/eprint/56074
ISSN: 0006-8950
PURE UUID: c3ad2869-d94d-47ab-ada8-1e670a9c5077

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Date deposited: 07 Aug 2008
Last modified: 17 Jul 2017 14:31

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Contributors

Author: N.R. Sibson
Author: A.M. Blamire
Author: V.H. Perry
Author: J. Gauldie
Author: P. Styles
Author: D.C. Anthony

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