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Cited by 116Ginkgo biloba and Cashew ApplicationsImmune Response and InflammationFlavonoids in Medical Research

The DOI matches its Crossref record; 59 of the 62 references it cites were found in a registry or an index.

Effects of Ginkgo biloba extract (EGb 761) and quercetin on lipopolysaccharide-induced release of nitric oxide

Wadsworth, Teri L, Koop, Dennis R·2001·Chemico-Biological Interactions
DOI 10.1016/s0009-2797(01)00208-3
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Abstract

Administration of bacterial lipopolysaccharide (LPS) to laboratory animals and cultured macrophages is known to induce the production of nitric oxide (NO) from inducible nitric oxide synthase (iNOS). Here we show that pre-treatment with Ginkgo biloba extract (EGb 761) suppresses the in vivo production of NO (measured by the Griess reaction) after challenge with LPS. In order to begin to understand the mechanism of this inhibition, we evaluated in vitro effects of EGb 761 and its flavonoid component, quercetin, on LPS-treated RAW 264.7 macrophages. Pre-treatment with EGb 761 or quercetin dose-dependently inhibited NO release. Both substances scavenged NO generated from the decomposition of sodium nitroprusside. Western analysis showed that EGb 761 and quercetin inhibited LPS-induced levels of iNOS protein. Northern blotting demonstrated that EGb 761 and quercetin decreased LPS-induced iNOS mRNA levels without altering the half-life. Activation of mitogen activated protein kinases (MAPKs) and the redox-sensitive transcription factors, nuclear factor-kappaB (NF-kappaB) and activator protein 1 (AP-1) are key events in the signal transduction pathways mediating iNOS induction. In our studies, both EGb 761 and quercetin inhibited p38 MAPK activity, which is necessary for iNOS expression in LPS-stimulated RAW 264.7 macrophages. However, differences in the response of NF-kappaB, AP-1, and Jun N-terminal kinase/stress activated protein kinase (JNK/SAPK) and its downstream substrates to EGb 761 and quercetin suggest that quercetin is not the sole component responsible for the in vivo inhibition of LPS-induced iNOS activation by EGb 761.

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Research works printed but not linked: 1

  1. Xie, 1994, Role of transcription factor NF-kappa B/Rel in induction of nitric oxide synthase, J. Biol. Chem., 269, 4705, 10.1016/S0021-9258(17)37600-7 · DOI · Paper page

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Metadata

Authors
Wadsworth, T. L., & Koop, D. R.
Affiliations
Oregon Health & Science University (US)
Corresponding author
Koop, Dennis R
Venue
Chemico-Biological Interactions
Publisher
Elsevier BV
Published
2001-07
Volume
137
Issue
1
Pages
43-58
ISSN
0009-2797 (ISSN-L)
DOI
10.1016/s0009-2797(01)00208-3
OpenAlex
W2035027020
Cited by
116
References
62
Citations by year
2025: 1 · 2024: 3 · 2023: 2 · 2022: 3 · 2021: 2 · 2020: 4 · 2019: 3 · 2018: 2 · 2017: 4 · 2016: 2 · 2015: 6 · 2014: 3 · 2013: 7 · 2012: 5
FWCI
19.61
Type
journal article
Language
en
Open access
closed
Licence
Locations
  • Chemico-Biological Interactions (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute on Alcohol Abuse and Alcoholism (AA 08608)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Ginkgo biloba and Cashew Applications
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Pharmacology (medical) › Flavonoids in Medical Research
Keywords
Ginkgo biloba extract EGb 761, quercetin, lipopolysaccharide, nitric oxide, inducible nitric oxide synthase, macrophages, RAW 264.7 macrophages, p38 MAPK, NF-κB, AP-1, SAPK/JNK, flavonoids, anti-inflammatory activity, signal transduction
MeSH terms
Ginkgo Extract, Animals, Cells, Cultured, Dose-Response Relationship, Drug, Enzyme Inhibitors, Imidazoles, Lipopolysaccharides, Macrophages, Male, Mice, Inbred C57BL, Nitric Oxide, Nitroprusside, Plant Extracts, Pyridines, Quercetin, Tumor Necrosis Factor-alpha, Free Radical Scavengers, Nitric Oxide Synthase, Nitric Oxide Donors, Ginkgo biloba, Mice, Nitric Oxide Synthase Type II

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