Document Detail


In vivo gamma-tocopherol supplementation decreases systemic oxidative stress and cytokine responses of human monocytes in normal and asthmatic subjects.
MedLine Citation:
PMID:  18405673     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We have recently reported that gamma-tocopherol (gammaT) reduces allergen- and zymosan-induced inflammation using rodent models. As an initial step in extending these observations to humans, we conducted an open-label, Phase I dosing study of two doses (one or two capsules daily for 1 week) of a gamma-tocopherol-rich preparation containing 623 mg of gamma-tocopherol, 61.1 mg of d-alpha-tocopherol, 11.1 mg of d-beta-tocopherol (11.1 mg), and 231 mg of d-sigma-tocopherol per capsule. Endpoints for this study include serum levels of 5-nitro-gamma-tocopherol, as a marker of oxidative stress, and changes in serum gamma-, alpha-, and delta-tocopherol and gamma-2'-carboxyethyl-6-hydroxychroman (CEHC) 6 and 24 h after the first dose and after 1 week of treatment. To assess the biological activity of this treatment, we obtained peripheral blood mononuclear cells at baseline and after 1 week of treatment with two capsules of a gamma-tocopherol-rich preparation/day and examined the inflammatory cytokine response of these cells in culture to ex vivo endotoxin/LPS (0.01 ng/ml) challenge. We also monitored a number of safety endpoints to examine how well this preparation is tolerated in eight normal volunteers (four allergic and four nonallergic) and eight allergic asthmatics. We further obtained human monocytes from a subset of these volunteers and treated them ex vivo with gammaT, alphaT, gamma-CEHC, and alpha-CEHC and assessed their actions on LPS-induced degradation of IkappaBalpha and JNK signaling and ROS generation. As detailed herein, this open-label study demonstrates that gamma-tocopherol-enriched supplementation decreased systemic oxidative stress, increased serum levels of gamma-tocopherol, and inhibited monocyte responses to LPS without any adverse health effects. Further, in vitro treatment of human monocytes with gamma-CEHC and alpha-CEHC inhibits ROS generation and LPS-induced degradation of IkappaB and JNK activation.
Authors:
Jessica Wiser; Neil E Alexis; Qing Jiang; Weidong Wu; Carole Robinette; Robert Roubey; David B Peden
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2008-03-12
Journal Detail:
Title:  Free radical biology & medicine     Volume:  45     ISSN:  0891-5849     ISO Abbreviation:  Free Radic. Biol. Med.     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-06-06     Completed Date:  2008-12-17     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  8709159     Medline TA:  Free Radic Biol Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  40-9     Citation Subset:  IM    
Affiliation:
The Center for Environmental Medicine, Asthma and Lung Biology, University of North Carolina School of Medicine, Chapel Hill, NC 27599-7310, USA.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Animals
Asthma / metabolism*
Cells, Cultured
Cytokines / blood*,  secretion
Drug Toxicity
Health*
Humans
I-kappa B Kinase / metabolism
Middle Aged
Monocytes / drug effects*,  secretion
Oxidative Stress / drug effects*
Phorbol Esters / pharmacology
Reactive Oxygen Species / metabolism
gamma-Tocopherol / blood,  pharmacology*
Grant Support
ID/Acronym/Agency:
P01 AT002620-03/AT/NCCAM NIH HHS; P01 AT002620-030001/AT/NCCAM NIH HHS; P01AT002620/AT/NCCAM NIH HHS
Chemical
Reg. No./Substance:
0/Cytokines; 0/Phorbol Esters; 0/Reactive Oxygen Species; 0/gamma-Tocopherol; EC 2.7.11.10/I-kappa B Kinase
Comments/Corrections

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