Enhanced reduction in oxidative stress and altered glutathione and thioredoxin system response to unsaturated fatty acid load in familial hypercholesterolemia.

Abstract:

OBJECTIVES:Familial hypercholesterolemia (FH) is characterized by increased oxidative stress (OS) levels. In the postprandial state, lipids and lipoproteins modulate OS status through their impact on pro-oxidant and antioxidant mechanisms. The objective of this study was to evaluate in patients with FH the response to an unsaturated oral fat load test (OFLT) by analyzing the mRNA levels of genes involved in the glutathione and thioredoxin antioxidant systems. DESIGN AND METHODS:We analyzed 14 FH patients and 20 normolipidemic and normoglycemic controls. In both groups, mRNA values of antioxidant enzyme genes (glutathione and thioredoxin systems) were determined at baseline and at 2, 4, 6, and 8h after OFLT by real time PCR. RESULTS:In the fasting state the mRNA levels of antioxidant enzymes GPX4 and the GSR, GSS, and GCLC enzymes (involved in glutathione regeneration and synthesis) and thioredoxin (TXN), were significantly increased in the FH group compared to the healthy controls. Some genes (GPX1 and GPX4) were increased at 4h in both groups, but values for the rest of the antioxidant enzyme mRNAs were decreased in FH patients after 4h from unsaturated OFLT and were increased in controls. CONCLUSIONS:We concluded that an OFLT with predominantly unsaturated fat has a different effect on postprandial antioxidant enzyme mRNA levels in controls than in FH patients. Increased antioxidant enzyme mRNA is not the main way to reduce postprandial oxidative stress in FH. This difference could determine the influence of dietary patterns in these patients.

journal_name

Clin Biochem

journal_title

Clinical biochemistry

authors

Cortes R,Martinez-Hervas S,Ivorra C,De Marco G,Gonzalez-Albert V,Rojo-Martínez G,Saez G,Carmena R,Ascaso JF,Real JT,Chaves FJ

doi

10.1016/j.clinbiochem.2014.09.006

subject

Has Abstract

pub_date

2014-12-01 00:00:00

pages

291-7

issue

18

eissn

0009-9120

issn

1873-2933

pii

S0009-9120(14)00663-8

journal_volume

47

pub_type

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