Cellular enrichment with polyunsaturated fatty acids induces an oxidative stress and activates the transcription factors AP1 and NFkappaB.

Abstract:

:A 48-h incubation of cultured human fibroblasts with 5 x 10(-5) M oleic acid or polyunsaturated fatty acids (PUFA) from the (n-6) (linoleic, gamma-linolenic and arachidonic acids) or (n-3) (alpha-linolenic and eicosapentaenoic acids) series resulted in an enrichment of the cells with the introduced fatty acid. Cell enrichment with PUFA initiated a rise in the intracellular level of reactive oxygen species (ROS) and lipid peroxidation products (thiobarbituric reactive substances TBARS). Simultaneously, cell enrichment with all the studied PUFA induced an increase in AP1 and NFkappaB binding activity measured by electrophoretic mobility shift assay, whereas no significant effect was observed with the monounsaturated oleic acid. Furthermore, the antioxidants vitamin E (alpha-tocopherol) and N-acetyl cysteine prevented both the arachidonic acid-induced increase in intracellular ROS and TBARS, and the activation of AP1 and NFkappaB. These results indicate that the accumulation of PUFA from (n-6) and (n-3) series elicited an intracellular oxidative stress, resulting in the activation of oxidative stress-responsive transcription factors such as AP1 and NFkappaB.

authors

Mazière C,Conte MA,Degonville J,Ali D,Mazière JC

doi

10.1006/bbrc.1999.1644

subject

Has Abstract

pub_date

1999-11-01 00:00:00

pages

116-22

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(99)91644-3

journal_volume

265

pub_type

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