Oxidative stress-mediated bimodal regulation of polymorphonuclear leukocyte spreading by polyphenolic compounds

被引:4
作者
Suzuki, Kingo [1 ]
Kori, Soichiro [1 ]
Morikawa, Manatsu [1 ]
Takagi, Ai [1 ]
Namiki, Hideo [1 ]
机构
[1] Waseda Univ, Dept Biol, Sch Educ, Shinjuku Ku, Tokyo 1628480, Japan
关键词
Polymorphonuclear leukocyte; Spreading; Pyrogallol; 1,2,4-benzenetriol; Oxidative stress; GREEN TEA EXTRACT; HYDROGEN-PEROXIDE; EPIGALLOCATECHIN GALLATE; ACIDIFIED ENVIRONMENT; COFFEE-DRINKING; CELLS; INFLAMMATION; NEUTROPHIL; ADHESION; BINDING;
D O I
10.1016/j.intimp.2010.08.020
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Pyrogallol-bearing polyphenolic compounds induce spreading of polymorphonuclear leukocytes (PMNL), although their optimal concentrations for induction of spreading are quite different (2000, 200, and 2 mu M for pyrogallol, (-)-epigallocatechin gallate (EGCG), and tannic acid (TA), respectively), and TA tends to inhibit spreading at higher concentrations. In this study, we examined the involvement of oxidative stress in the regulation of PMNL spreading by these compounds. All three compounds in solution generated H2O2 to a similar extent. Adsorption of the polyphenols to cell surfaces and their accumulation within cells were assessed by detection of the H2O2 precursor O-2(-) produced by the compounds through reduction of cytochrome c and p-nitro-blue tetrazolium, respectively. TA showed the highest degree of adsorption. EGCG adhered only to PMNL pre-fixed by paraformaldehyde, whereas pyrogallol did not adhere. None of the compounds caused intracellular O-2(-) generation. A non-pyrogallic compound, 1,2,4-benzenetriol (BT), also produced H2O2; it had no stimulatory effect on PMNL spreading, but inhibited spreading induced by other stimuli. BT did not adhere to PMNL but accumulated within them, and generated O-2(-) in the presence of glycine. Thiol antioxidants abrogated all of the above spreading-regulatory effects of the polyphenolic compounds. We conclude that H2O2-generating polyphenols bimodally regulate the spreading of PMNL by subjecting them to oxidative stress. The ability of polyphenol to adhere to, or accumulate within. PMNL may govern the nature of the oxidative stress and determine the optimal concentration of each compound for induction of spreading, as well as whether spreading is promoted or inhibited. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:1448 / 1455
页数:8
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