Substance P antagonist blocks leakage and reduces activation of cytokine-stimulated rat brain endothelium
We recently demonstrated that substance P mediates increased permeability of brain endothelium exposed to HIV-1 gp120. To test whether substance P is involved in immune processes at the blood–brain barrier (BBB), we stimulated rat brain endothelial cultures prepared from cerebral microvessels with I...
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Published in | Journal of neuroimmunology Vol. 131; no. 1; pp. 41 - 49 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Netherlands
Elsevier B.V
01.10.2002
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Subjects | |
Online Access | Get full text |
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Summary: | We recently demonstrated that substance P mediates increased permeability of brain endothelium exposed to HIV-1 gp120. To test whether substance P is involved in immune processes at the blood–brain barrier (BBB), we stimulated rat brain endothelial cultures prepared from cerebral microvessels with Interferon-γ (IFN-γ) and Tumor necrosis factor-α (TNF-α), two proinflammatory cytokines that alter the BBB and measured permeability to albumin and expression of adhesion molecule ICAM-1 and MHC class II antigen in the presence and absence of spantide, a powerful substance P antagonist. In a dose-dependent manner, spantide completely neutralized increased permeability induced by TNF-α and IFN-γ and expression of MHC class II molecule induced by IFN-γ and prevented associated cell morphological changes as revealed by scanning electron microscope. Spantide also reduced expression of ICAM-1 induced by TNF-α and IFN-γ by 35% and 30%, respectively. Substance P mRNA was found in unstimulated brain endothelial cells and was upregulated after stimulation with TNF-α and IFN-γ. These in vitro findings demonstrate that substance P plays a major pathogenetic role in damaging and activating the BBB vascular component in the presence of proinflammatory cytokines. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0165-5728 1872-8421 |
DOI: | 10.1016/S0165-5728(02)00262-X |