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Physiological Study of Human Cholesterol Metabolism and Excretion

5. maj 2016 opdateret af: Richard E. Ostlund Jr., MD

Reverse Cholesterol Transport in Humans

The underlying hypothesis is that whole body cholesterol - including cholesterol present in tissues that cannot be measured by standard blood tests - is related to heart disease risk. Endogenous cholesterol will be labeled with an intravenous infusion of one type of cholesterol tracer and dietary cholesterol will be labeled with another. These tracers will be used to measure how fast cholesterol is synthesized and excreted using mass spectrometry to distinguish the tracers. Data will be related to circulating biomarkers (blood tests) and to the thickness of the lining of the carotid artery. The effect of the drug ezetimibe on these processes will also be determined. Successful completion of this study will give us more knowledge about cholesterol metabolism that may be useful in designing new drugs and treatments for patients with heart disease, especially those that are already receiving maximum amounts of current medications.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

The central hypothesis of this proposal is that reverse cholesterol transport is related to coronary heart disease (CHD) risk. It is complementary to the concept that reduction of cholesterol biosynthesis with statin drugs prevents CHD, but it focuses on whole body cholesterol metabolism and kinetic cholesterol transport rather than on static levels of circulating lipoproteins. Although this is an old idea, it has not been adequately tested in humans because of lack of suitable methods. In this proposal we will apply innovative stable isotope and mass spectroscopic technology to study reverse cholesterol transport in human subjects. The first specific aim is to improve the preparation of intravenous deuterated cholesterol tracer, a critical limiting element in the study of whole body cholesterol metabolism. The second aim is to use that intravenous tracer, along with a different oral tracer, to partition fecal cholesterol into excreted endogenous cholesterol, unabsorbed dietary cholesterol and newly-synthesized cholesterol derived from the liver and intestine. Measurements will be made during consumption of a controlled diet provided by the metabolic kitchen. The pool size of the rapidly-mixing body cholesterol pool will be measured along with the fractional rate of cholesterol catabolism. These direct measures of reverse cholesterol transport will be correlated with plasma biomarkers and with metabolic covariates. The relation of reverse cholesterol transport to carotid intima-media thickness will be determined. The third specific aim will use similar methods to study the mechanism of action for the widely-used drug ezetimibe. The fractional rate of endogenous cholesterol excretion and the rate of plasma cholesterol turnover will be determined in two periods, one with drug and one with placebo treatment. This work represents a new direction for cholesterol research with the potential to develop new and complementary methods of reducing CHD risk that can be added to diet and statin drug treatment.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

132

Fase

  • Fase 1

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Forenede Stater
    • Missouri
      • St. Louis, Missouri, Forenede Stater, 63110
        • Washington University School of Medicine

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år til 80 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Aim II. 100 subjects aged 30-80 with stable medical and/or surgical illnesses.
  • Aim III. 30 subjects age 18-80 with LDL cholesterol <190, fasting triglycerides<250 and stable medical or surgical illnesses.

Exclusion Criteria:

  • Aim II. Subjects taking ezetimibe, bile acid sequestrants or with gastrointestinal or liver disease will be excluded since these may affect whole body cholesterol metabolism.
  • Subjects with coronary heart disease or other medical illnesses will not be excluded if medically stable.
  • Adults under age 30 and children will be excluded because in our current database there is no relation between carotid intima-media thickness and cardiovascular risk factors in this younger group.
  • Aim III. Individuals have risk factors for coronary heart disease that mandate drug treatment according to the National Cholesterol Education Program guidelines will be excluded.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Grundvidenskab
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Firedobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Ingen indgriben: Observational Arm
Cholesterol metabolic parameters will be measured in 100 subjects in an observational study. Results will be related to circulating biomarkers and carotid intima-media thickness.
Placebo komparator: Ezetimibe Interventional Arm
Cholesterol metabolic parameters will be measured before and after ezetimibe or placebo intervention. Changes due to ezetimibe will be determined
Medicin: Ezetimibe
Ezetimibe 10 mg/day or placebo will be given for 6 weeks
Andre navne:
  • Zetia

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Fractional Excretion of Endogenous Cholesterol
Tidsramme: 4 years
The fractional rate of endogenous cholesterol excretion will be measured and related to circulating biomarkers and carotid intima-media thickness (Aim #2) or the change in fractional endogenous cholesterol excretion after treatment with ezetimibe will be determined (Aim #3)
4 years

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Richard E. Ostlund Jr., MD

Samarbejdspartnere

National Heart, Lung, and Blood Institute (NHLBI)

Efterforskere

  • Ledende efterforsker: Richard E Ostlund, MD, Washington University School of Medicine

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

1. januar 2014

Primær færdiggørelse (Faktiske)

1. juni 2015

Studieafslutning (Faktiske)

1. juni 2015

Datoer for studieregistrering

Først indsendt

18. maj 2012

Først indsendt, der opfyldte QC-kriterier

21. maj 2012

Først opslået (Skøn)

23. maj 2012

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

6. maj 2016

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

5. maj 2016

Sidst verificeret

1. maj 2016

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • 201110042
  • R01HL108160 (U.S. NIH-bevilling/kontrakt)

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

UBESLUTET

IPD-planbeskrivelse

Data will be shared subject to IRB and HIPAA restrictions.

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

Kliniske forsøg med Kardiovaskulær sygdom

Kliniske forsøg med Ezetimibe

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Sponsorer og samarbejdspartnere

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Betingelser

Sjældne sygdomme

Narkotikainterventioner

Kosttilskud

Sponsor / samarbejdspartnere

Placeringer

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