Abstract：
:Chronic inflammation has been implicated as the underlying factor in the pathogenesis of many disorders. In the past decade, inflammation-related endogenous production of reactive nitrogen species, similar to oxygen free radicals, has also been suggested as a risk factor for cancer, in addition to the well-studied exogenous nitroso compounds. Epidemiological, in vitro, and animal model studies have implicated green tea to be protective against nitroso compound-induced and inflammation-related cancer. Therefore, we investigated the effect of epigallocatechin-3-gallate (EGCG), one of the known biologically active catechins contained in green tea, on the production of nitric oxide (NO.). We have shown previously that EGCG reduces NO. production as measured by nitrite accumulation in the culture medium. Expanding on this finding, in this report we show that EGCG may do so by two mechanisms: reduction of inducible nitric oxide synthase (iNOS) gene expression and inhibition of enzyme activity. Addition of 1-10 microM EGCG to lipopolysaccharide- and interferon-gamma-activated mouse peritoneal cells reduced iNOS mRNA expression concentration dependently, to 82-14%, as measured by relative reverse transcription-polymerase chain reaction. Addition of 50-750 microM EGCG, in a concentration-dependent manner, inhibited the enzyme activity of iNOS, to 85-14%, and neuronal nitric oxide synthase (nNOS), to 93-56%, as measured by citrulline formation. EGCG competitively inhibited binding of arginine and tetrahydrobiopterin, and the gallate structure is important for this action.
journal_name
Biochem Pharmacoljournal_title
Biochemical pharmacologyauthors
Chan MM,Fong D,Ho CT,Huang HIdoi
10.1016/s0006-2952(97)00504-2subject
Has Abstractpub_date
1997-12-15 00:00:00pages
1281-6issue
12eissn
0006-2952issn
1873-2968pii
S0006-2952(97)00504-2journal_volume
54pub_type
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pub_type： 杂志文章
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更新日期：1986-03-15 00:00:00
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pub_type： 杂志文章
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更新日期：1994-01-20 00:00:00
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doi：10.1016/0006-2952(87)90549-1
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pub_type： 杂志文章
doi：10.1016/s0006-2952(97)00204-9
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pub_type： 杂志文章
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pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：1994-08-03 00:00:00
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pub_type： 杂志文章,评审
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更新日期：2020-03-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(94)00452-r
更新日期：1995-01-31 00:00:00
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更新日期：2015-08-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章,评审
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更新日期：2014-01-01 00:00:00
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pub_type： 杂志文章
doi：10.1016/0006-2952(84)90120-5
更新日期：1984-11-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章,评审
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更新日期：2011-10-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2006.01.003
更新日期：2006-04-28 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章,评审
doi：10.1016/j.bcp.2013.10.030
更新日期：2014-04-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2013.03.011
更新日期：2013-06-01 00:00:00
