Cited by 83Neuroinflammation and Neurodegeneration MechanismsPharmacological Receptor Mechanisms and EffectsPain Mechanisms and Treatments

Inhibition of lipopolysaccharide‐induced cyclooxygenase‐2, tumor necrosis factor‐α and [Ca2+]i responses in human microglia by the peripheral benzodiazepine receptor ligand PK11195

Choi, Hyan B., Khoo, C., Ryu, Jae K., Van Breemen, Edo, Kim, Seung U., McLarnon, James G.·2002·Journal of Neurochemistry

Abstract

The anti-inflammatory actions of the mitochondrial peripheral benzodiazepine receptor (PBR) agonist PK11195 [1-(2-chloro- phenyl)-N-methyl-N-(1-methylpropyl)-3-isoquinoline-carboxamide] were investigated in human microglia. Application of the microglial inflammatory stimulus lipopolysaccharide (LPS, at 100 ng/mL for 3 h), induced enhancement of the expressions of the inducible enzyme, cyclooxygenase-2 (COX-2) and the pro-inflammatory cytokine, tumor necrosis factor-alpha (TNF-alpha). PK11195 (at 50 microm) significantly inhibited the LPS-induced up-regulation of both inflammatory factors; at a lower concentration of PK11195 (2 microm) expression of TNF-alpha, but not COX-2, was reduced. Production of both factors, using immunocytochemistry for COX-2 and ELISA for TNF-alpha, was markedly reduced with 50 microm of PK11195 added to LPS solution. Acute application of LPS induced a transient increase in intracellular Ca2+[Ca2+]i exhibiting both a slow development and recovery in kinetic behavior. This increase in [Ca2+]i consisted primarily of a Ca2+ influx component accompanied by a smaller mobilization from intracellular Ca2+ stores. In the presence of PK11195, the amplitude of the [Ca2+]i response induced by LPS was reduced by 54%. Another mitochondrial agent cyclosporin A (CsA), which also acts at the permeability transition pore (PTP) of mitochondrial membrane but at a site different from the PBR, was ineffective in reducing either the LPS-induced expression of COX-2 and TNF-…

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Crossref · 10.1046/j.1471-4159.2002.01122.x

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Authors
Choi, H. B., Khoo, C., Ryu, J. K., Van Breemen, E., Kim, S. U., & McLarnon, J. G.
Affiliations
University of British Columbia (CA)
Corresponding author
McLarnon, James G.
Venue
Journal of Neurochemistry
Publisher
Wiley
Published
2002-10-17
Volume
83
Issue
3
Pages
546-555
ISSN
  • 0022-3042 (ISSN-L)
  • 1471-4159
OpenAlex
W1509956998
Cited by
82
References
29
Citations by year
2026: 2 · 2024: 3 · 2023: 1 · 2022: 3 · 2021: 5 · 2020: 3 · 2019: 2 · 2018: 3 · 2017: 1 · 2016: 7 · 2015: 6 · 2014: 5 · 2013: 4 · 2012: 3
FWCI
1.50
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Heart and Stroke Foundation of Canada
  • Heart and Stroke Foundation of British Columbia and Yukon
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pharmacological Receptor Mechanisms and Effects
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
Keywords
PK11195, translocator protein (TSPO), microglia, lipopolysaccharide, cyclooxygenase-2, TNF-α, intracellular calcium, anti-inflammatory activity, mitochondrial permeability transition pore, cyclosporine, neuroinflammation
MeSH terms
Brain, Calcium, Cells, Cultured, Enzyme Induction, Enzyme Inhibitors, Enzyme-Linked Immunosorbent Assay, Humans, Immunohistochemistry, Intracellular Fluid, Isoenzymes, Isoquinolines, Ligands, Lipopolysaccharides, Membrane Proteins, Mitochondria, Prostaglandin-Endoperoxide Synthases, Receptors, GABA-A, Tumor Necrosis Factor-alpha, Up-Regulation, Cyclosporine, Microglia, Cyclooxygenase 2, GABA-A Receptor Agonists

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