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Completed

NCT Number: NCT01692340

Novel 13C Carotenoids for Absorption and Metabolism Studies in Humans

Tomatoes contain several compounds which may be beneficial for human health and prevention of disease, although this relationship is poorly understood and very controversial. This study uses a new technology to study the absorption and metabolism of three different compounds found in tomatoes. These compounds are called: phytoene, phytofluene, and lycopene. We hypothesize that by studying the absorption and metabolism of these compounds, we may be able to understand how the compounds may influence health and disease processes.

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Key information

Age range

21 year–70 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1 / Phase 2

Primary location

Ohio State University Medical Center

Columbus, Ohio, 43210, United States

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Between ages of 21-70 years old.
  • Body mass index of between 18 and 27 kg/m2 (inclusive).
  • Eastern Cooperative Oncology Group (ECOG)performance status of O.
  • Not currently be taking carotenoid supplements
  • Have Blood Urea Nitrogen (BUN)/Creatinine (CR), liver enzymes, Complete Blood Count (CBC), and Prothrombin time (PT/PTT/INR) within normal limits.
  • Have a hemoglobin level of at least 11 g /dL at the time of randomization.
  • Voluntarily agree to participate and sign an informed consent document.

Exclusion criteria

  • Have a known allergy or intolerance to tomatoes.
  • Have a history of a nutrient malabsorption disease (such as celiac disease) or other metabolic disorders requiring special diet recommendations.
  • Have uncontrolled hyperlipidemia (total cholesterol > 200 mg/dL, LDL > 160 mg/dL and serum triglycerides > 200 mg/dL) or lipidemia that may influence carotenoid pharmacokinetics or transport.
  • Smoke tobacco products
  • Have a history of pituitary hormone diseases that currently require supplemental hormonal administration (thyroid hormones, ACTH, growth hormone) or other endocrine disorders requiring hormone administration with the exception of diabetes and osteoporosis.
  • Are taking certain medications (prescription or over-the-counter) such as Orlistat, which interfere with dietary fat absorption.
  • Are taking complementary and alternative medications that at the discretion of the study physician Steven K. Clinton(SKC) may interfere with carotenoid absorption or metabolism.

Treatment and study plan

Isotopically labeled lycopene, phytoene or phytofluene

Other

We will administer 10 mg of labeled carotenoid mixed with olive oil and spread on an English muffin for consumption by participants.

Primary outcomes

  1. Plasma Half Life of Labeled Carotenoid

    Time frame: labelled lycopene: 0, 1, 2, 3, 4, 6, 8, 12, 24, 48, 72, 96 hours post-dose. Labelled phytoene: hourly for hours 0 - 15, then hours 17, 19 and 21 hours after dosing. Then, 1, 2, 3 4, 7, 10, 14, 17, 21 and 28 days post dose.

    We will study the half life of isotopically labeled carotenoids.

  2. Maximal Plasma Carotenoid Concentration

    Time frame: 0 to 48 hours

    We will determine the average maximal plasma carotenoid concentration in healthy volunteers

  3. Time of Maximal Carotenoid Concentration

    Time frame: 0 to 48 hours

    We will determine when the maximal carotenoid concentration is achieved in the plasma

Secondary outcomes

  1. Carotenoid Metabolites

    Time frame: Up to 28 days

    Study the metabolites produced from the labeled carotenoid in healthy subjects

Sponsors and collaborators

Lead sponsor

Ohio State University Comprehensive Cancer Center

Other

Collaborators

  • University of Illinois at Chicago

Registry information

Official study title

Novel 13C Carotenoids for Absorption and Metabolism Studies in Humans.

Important dates

Study start
2012
Primary completion
2013
Study completion
2013
First posted
Sep 25, 2012
Registry last updated
Mar 26, 2019

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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