Alcohol-induced blood?brain barrier dysfunction is mediated via inositol 1,4,5-triphosphate receptor (IP3R)-gated intracellular calcium release

Autor: Jialin C. Zheng, Santhi Gorantla, Bryan Knipe, Yuri Persidsky, James Haorah
Rok vydání: 2007
Předmět:
medicine.medical_specialty
Leukocyte migration
Myosin light-chain kinase
Blotting
Western
Fluorescent Antibody Technique
Acetaldehyde
Occludin
Blood–brain barrier
Biochemistry
Monocytes
Calcium in biology
Cellular and Molecular Neuroscience
chemistry.chemical_compound
Cell Movement
Internal medicine
Electric Impedance
medicine
Animals
Humans
Inositol 1
4
5-Trisphosphate Receptors
Drug Interactions
Nitric Oxide Donors
Inositol
RNA
Messenger
Cells
Cultured
Analysis of Variance
Dose-Response Relationship
Drug
Ethanol
Tight junction
Reverse Transcriptase Polymerase Chain Reaction
Central Nervous System Depressants
Endothelial Cells
Membrane Proteins
Extracellular Fluid
Hydrogen Peroxide
Temporal Lobe
Cell biology
Endocrinology
medicine.anatomical_structure
Gene Expression Regulation
chemistry
Calcium
Intracellular
Zdroj: Journal of Neurochemistry. 100:324-336
ISSN: 1471-4159
0022-3042
DOI: 10.1111/j.1471-4159.2006.04245.x
Popis: The blood-brain barrier (BBB) formed by brain microvascular endothelial cells (BMVEC), pericytes and astrocytes controls the transport of ions, peptides and leukocytes in and out of the brain. Tight junctions (TJ) composed of TJ proteins (occludin, claudins and zonula occludens) ensure the structural integrity of the BMVEC monolayer. Neuropathologic studies indicated that the BBB was impaired in alcohol abusers; however, the underlying mechanism of BBB dysfunction remains elusive. Using primary human BMVEC, we previously demonstrated that oxidative stress induced by ethanol (EtOH) metabolism in BMVEC activated myosin light chain kinase (MLCK), resulting in the enhanced phosphorylation of either cytoskeletal or TJ proteins, and in BBB impairment. We proposed that EtOH metabolites stimulated inositol 1,4,5-triphosphate receptor (IP(3)R)-operated intracellular calcium (Ca(2+)) release, thereby causing the activation of MLCK in BMVEC. Indeed, treatment of primary human BMVEC with EtOH or its metabolites resulted in the increased expression of IP(3)R protein and IP(3)R-gated intracellular Ca(2+) release. These functional changes paralleled MLCK activation, phosphorylation of cytoskeletal/TJ proteins, loss of BBB integrity, and enhanced leukocyte migration across BMVEC monolayers. Inhibition of either EtOH metabolism or IP(3)R activation prevented BBB impairment. These findings suggest that EtOH metabolites act as signaling molecules for the activation of MLCK via the stimulation of IP(3)R-gated intracellular Ca(2+) release in BMVEC. These putative events can lead to BBB dysfunction in the setting of alcoholism, and to neuro-inflammatory disorders promoting leukocyte migration across the BBB.
Databáze: OpenAIRE
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