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Attenuation of the oxidative burst-induced DNA damage in human leukocytes by hyaluronan.

Abstract：

:Oxidative burst provides the mechanism for specialized phagocytes, such as granulocytes or monocytes, to kill invading microorganisms through generation of superoxide anions. However, the oxidants generated during the burst damage DNA of the phagocytes and neighboring cells. Human blood leukocytes treated with phorbol myristate acetate (PMA) are considered to represent the experimental model of induction of oxidative burst. We recently reported that DNA damage in PMA-treated leukocytes is assessed by cytometric analysis of the induction of histone H2AX phosphorylation and Ataxia Telangiectasia Mutated (ATM) activation. In the present study we observed that hyaluronic acid (HA) of average molecular weight (MW) 5.4x10(6) and 2x10(6) at 0.1% (w/v) concentration significantly attenuated H2AX phosphorylation and ATM activation induced in leukocytes during oxidative burst. HA also reduced the intracellular level of PMA-induced reactive oxidants as measured by the ability of cells to oxidize 2',7'-dihydro-dichlorofluorescein-diacetate. No such effect was seen with HA of 6x10(4) MW. The data are consistent with earlier observations that HA of high MW protects DNA from oxidative damage induced by endo- or exogenous oxidants. The anti-oxidant effect of HA seen during oxidative burst also explains its anti-inflammatory effect when used to treat arthritic joints.

journal_name

Int J Mol Med

journal_title

International journal of molecular medicine

authors

Halicka HD,Mitlitski V,Heeter J,Balazs EA,Darzynkiewicz Z

doi

10.3892/ijmm_00000182

subject

Has Abstract

pub_date

2009-05-01 00:00:00

pages

695-9

issue

5

eissn

1107-3756

issn

1791-244X

journal_volume

23

pub_type

杂志文章

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