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Involvement of NF-kappaB and glutathione in cytotoxic effects of nitric oxide and taxol on human leukemia cells.

Abstract：

:Nitric oxide (NO) has been shown to be cytotoxic for normal and transformed cell lines. One of the intracellular targets for NO action is glutathione (GSH). GSH determinates cellular redox potential and modulates several biological events. During oxidative and nitrosative stress, glutathione system imbalance is associated with the upregulation of gamma-glutamylcysteine synthetase (gamma-GCS) expression, which is mediated by nuclear factor kappaB (NF-kappaB). Our previous studies demonstrated a cytotoxic effect of NO and taxol on human lymphoblastic leukemia cells triggered by inhibition of NF-kappaB activity. In this study, we have demonstrated the involvement of GSH in taxol- and NO-induced cytotoxic effects on human CEM leukemia cells. NO- and taxol-induced a depletion of GSH levels in CEM cells, which was potentialized by l-buthionine-S,R-sulfoximine (BSO), an inhibitor of gamma-GCS. BSO induced an increase in nuclear translocation of NF-kappaB. However, when cells were treated with NO or taxol in association with BSO, these compounds inhibited the constitutive activity of NF-kappaB. These results suggest that oxidative and nitrosative damage in lymphoblastic leukemia cells shall be mediated by NO- and taxol-induced GSH depletion as a consequence of preventing GSH synthesis.

journal_name

Leuk Res

journal_title

Leukemia research

authors

Santos-Silva MC,Freitas MS,Assreuy J

doi

10.1016/j.leukres.2005.06.021

keywords:

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

145-52

issue

2

eissn

0145-2126

issn

1873-5835

pii

S0145-2126(05)00262-6

journal_volume

30

pub_type

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