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Effect of Gamma Tocopherol Supplementation on Neutrophil Response to 20,000 EU of Clinical Center Reference Endotoxin in Normal Adults (GammaTox)

This study has been completed.
National Center for Complementary and Integrative Health (NCCIH)
Information provided by:
University of North Carolina, Chapel Hill Identifier:
First received: February 28, 2008
Last updated: April 14, 2011
Last verified: April 2011

The purpose of this research study is to learn whether high dose vitamin E (gamma tocopherol) will affect the way your body responds to an acute inflammation in your lungs. Vitamin E is found in soybean and vegetable oils as well as many plant seeds. Gamma tocopherol (gT), a component of vitamin E, composes 70-80% of Vitamin E in the U.S. diet. Alpha tocopherol (aT), another large component of vitamin E, makes up less than 10% of vitamin E in the U.S. diet, but is the major form in blood and tissue. It is also the major form of Vitamin E in over-the-counter supplements. However, gT has anti-inflammatory properties which are not present in aT. Preliminary data suggests that gT protects from ozone-induced exacerbation in animal studies, and previous studies have shown levels of gT are inversely associated with heart disease.

We will ask you to undergo a challenge with endotoxin, which is a bacterial component of air pollution. From other studies we have done, we know that if you inhale 20,000 EUs (endotoxin units) we will see an increase in the number of neutrophils (a type of white blood cell that your body produces to fight infection) in your lung cells without causing you to have flu-like symptoms. We will investigate if there is a change in your lung inflammatory cells after the endotoxin challenge when you take the gT versus when you take a placebo.

Condition Intervention Phase
Drug: gamma tocopherol
Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Basic Science
Official Title: Effect of Gamma Tocopherol Supplementation on Neutrophil Response to 20,000 EU of Clinical Center Reference Endotoxin in Normal Adults

Resource links provided by NLM:

Further study details as provided by University of North Carolina, Chapel Hill:

Primary Outcome Measures:
  • The primary goal of this study is to determine the effect of γT on endotoxin-induced airway inflammation in non-allergic, non-asthmatic subjects. [ Time Frame: CCRE challenge after 7 days of treatment with gT or SO ]

Enrollment: 18
Study Start Date: May 2008
Study Completion Date: July 2009
Primary Completion Date: July 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
1 Drug: gamma tocopherol
Maxi Gamma softgels 1200mg QD


Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy nonsmoking volunteers with normal lung function

Exclusion Criteria:

  • Chronic illness
  • Asthma
  • Active allergies
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00631085

United States, North Carolina
University of North Carolina CEMALB
Chapel Hill, North Carolina, United States, 27599
Sponsors and Collaborators
University of North Carolina, Chapel Hill
National Center for Complementary and Integrative Health (NCCIH)
Principal Investigator: Michelle Hernandez, MD University of North Carolina
  More Information

Responsible Party: Michelle Hernandez, MD, UNC_Chapel Hill Identifier: NCT00631085     History of Changes
Other Study ID Numbers: GCRC 2678 IRB 08-0082
5P01AT002620 ( US NIH Grant/Contract Award Number )
Study First Received: February 28, 2008
Last Updated: April 14, 2011

Keywords provided by University of North Carolina, Chapel Hill:
healthy nonsmoking nonasthmatic volunteers

Additional relevant MeSH terms:
Vitamin E
Molecular Mechanisms of Pharmacological Action
Protective Agents
Physiological Effects of Drugs
Growth Substances processed this record on April 28, 2017