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PDE5 Inhibition for Obesity-Related Cardiometabolic Dysfunction

3 mei 2022 bijgewerkt door: Evan Brittain, Vanderbilt University Medical Center
Obesity and its adverse cardiometabolic consequences are major public health problems. Several features of obesity contribute to the associated cardiovascular risk and are potential targets for intervention. These include insulin resistance and beta cell dysfunction, reduced metabolic rate, and impaired aerobic capacity.The purpose of this study is to examine if the phosphodiesterase type 5A inhibitor tadalafil improves cardiometabolic health in individuals who are obese and insulin resistant.

Studie Overzicht

Toestand

Voltooid

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

Obesity is a risk factor for nearly all cardiovascular (CV) disease including coronary artery disease, hypertension, and heart failure. Increased CV risk in obese individuals appears to depend largely on the degree of metabolic dysregulation and metabolic risk factors (glucose intolerance, dyslipidemia, etc.). Notably, interventions that improve insulin sensitivity and cardiorespiratory fitness can reduce CV risk in obese individuals, even in the absence of weight loss.

The cyclic guanylate monophosphate pathway (cGMP) is involved in energy homeostasis and systemic metabolism. Multiple lines of evidence suggest that increasing cGMP activity is beneficial from a metabolic standpoint. Tadalafil is a clinically-available drug that inhibits the enzyme that breaks down cGMP.

The study investigators hypothesize that chronic PDE5 inhibition in obese, insulin-resistant adults will improve cardiometabolic health.

Aim 1: To examine the effect of PDE5 inhibition on energy expenditure. Aim 2: To examine the effect of PDE5 inhibition on insulin sensitivity and secretion.

Aim 3: To examine the effect of PDE5 inhibition on cGMP tone and circulating mediators of cardiometabolic risk.

Studietype

Ingrijpend

Inschrijving (Werkelijk)

141

Fase

  • Fase 2

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studie Locaties

  • Verenigde Staten
    • Tennessee
      • Nashville, Tennessee, Verenigde Staten, 37215
        • Vanderbilt University Medical Center

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

21 jaar tot 50 jaar (Volwassen)

Accepteert gezonde vrijwilligers

Ja

Geslachten die in aanmerking komen voor studie

Allemaal

Beschrijving

Inclusion Criteria:

  • Adults (ages 21-50)
  • Obesity (BMI ≥ 30 kg/m2)
  • Prediabetes on oral glucose tolerance test.

Exclusion Criteria:

  • Age <21 or > 50
  • BMI < 30 kg/m2
  • Systolic blood pressure (SBP) < 100, > 150 mmHg
  • Current anti-hypertensive medication use, including diuretics
  • Current use of organic nitrates
  • Current use of PDE-5 inhibitors (sildenafil, tadalafil, vardenafil)
  • History of reaction to PDE-5 inhibitors
  • Known HIV infection
  • Use of medications that strongly alter CYP3A4 activity
  • History of myocardial infarction, angina, uncontrolled cardiac arrhythmia, stroke, transient ischemic attack, or seizure
  • Known non-arteritic ischemic optic retinopathy (NAIOR)
  • History of hearing loss
  • Estimated glomerular filtration rate (eGFR) < 60 ml/min/1.73 m2 by the modified diet in renal disease (MDRD) equation
  • Hepatic transaminase (AST and ALT) levels greater than three times the upper limit of normal
  • Known pregnancy or breastfeeding or those unwilling to avoid pregnancy during the course of the study
  • History of priapism
  • Use in excess of four alcoholic drinks daily
  • History of diabetes mellitus or use of anti-diabetic medications
  • Known anemia (men, Hct < 38% and women, Hct <36%)
  • Menopause
  • Inability to exercise on a bicycle
  • Weight > 300 pounds

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Behandeling
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Parallelle opdracht
  • Masker: Verdrievoudigen

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Actieve vergelijker: Tadalafil
Subjects will be randomized to one of two arms. 100 obese adult subjects will be randomized to the Tadalafil arm following the screening visit. Beginning at their baseline visit, they will receive an oral daily dose of Tadalafil (20mg) that they will take for 12 weeks (through their completion of the study). After randomization has occurred, the active comparator subjects will undergo the following visit protocol: baseline visit (two half-days), an interim visit (6 weeks post-baseline), and a 12-week visit (two half-days).
Geneesmiddel: Tadalafil
Tadalafil is an FDA approved, clinically-available drug that inhibits the enzyme phosphodiesterase type 5A (PDE5). Subjects who are randomized to this arm will be provided with 20mg of Tadalafil to take every day for 12 weeks, beginning at their baseline visit.
Andere namen:
  • CIALIS
Placebo-vergelijker: Placebo
Subjects will be randomized to one of two arms. 100 obese adult subjects will be randomized to the placebo arm following the screening visit. Beginning at their baseline visit, they will receive an oral daily dose of a placebo pill (20mg) that they will take for 12 weeks (through their completion of the study). After randomization has occurred, the placebo comparator subjects will undergo the following visit protocol: baseline visit (two half-days), an interim visit (6 weeks post-baseline), and a 12-week visit (two half-days).
Geneesmiddel: Placebo
100 patients will be randomized to receive a placebo pill. Subjects in this arm will be provided with 20mg Placebo to take every day for 12 weeks, beginning at their baseline visit.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Resting Energy Expenditure After 12 Weeks of Drug Therapy (kcal/Day)
Tijdsspanne: 12 weeks
Subjects will undergo a metabolic chamber protocol to measure resting exercise energy expenditure (kcal/min) at 12 weeks adjusted statistically for the baseline measurement.
12 weeks
Insulin Sensitivity After 12 Weeks of Drug Therapy
Tijdsspanne: 12 weeks
Subjects will undergo an insulin modified fasting intravenous glucose tolerance test (FS-IVGTT) protocol at 12 weeks adjusted statistically for the baseline measurement.
12 weeks

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Physical Activity-induced Energy Expenditure (kcal/Day)
Tijdsspanne: 12 weeks
During the metabolic chamber protocol, conducted at baseline and at 12 weeks, the cardiopulmonary exercise test protocol will be conducted. The Energy Expenditure (EE) related to physical activity will be calculated as peak EE above the resting level while performing the exercise test.
12 weeks
Dual Energy X-Ray Absorptiometry (DEXA) (g)
Tijdsspanne: 12 weeks
fat mass at 12 weeks.
12 weeks
Quality of Life Using the Medical Outcomes Study Short-Form Health Survey (SF-36) Physical Component Score
Tijdsspanne: 12 weeks
Quality of life will be assessed using the Medical Outcomes Study Short-Form Health Survey (SF-36). The SF-36 is a 36 question survey with a total score range from 0-100; higher scores indicate better quality of life.
12 weeks
Change in cGMP/NP Ratio After 12 Weeks of Drug Therapy
Tijdsspanne: 12 weeks
Subjects will undergo a fasting blood draw at baseline and 12 weeks to measure the change in ratio of plasma cyclic guanylate monophosphate pathway (cGMP) to plasma natriuretic peptides (NP) in response to the drug intervention (placebo or tadalafil).
12 weeks
Maximal Oxygen Consumption
Tijdsspanne: 12 weeks
Subjects will undergo a symptom-limited cardiopulmonary exercise test to measure peak oxygen consumption (VO2 max). Maximal oxygen consumption will be measured as 'mL/min'.
12 weeks
Sexual Function
Tijdsspanne: 12 weeks
The Female Sexual Function Index will be used to measure sexual function in women with a range from 2-36 with higher scores indicating better sexual function.
12 weeks
Maximal Exercise Energy Expenditure (kcal/Day)
Tijdsspanne: 12 weeks
Subjects will undergo a metabolic chamber protocol to measure maximal exercise energy expenditure (kcal/min) at 12 weeks adjusted statistically for the baseline measurement. Maximal Exercise Energy Expenditure will be measured as "kcal/day"
12 weeks

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Vanderbilt University Medical Center

Onderzoekers

  • Hoofdonderzoeker: Thomas J Wang, MD, Vanderbilt Cardiovascular Medicine
  • Hoofdonderzoeker: Evan L Brittain, MD, MSCI, Vanderbilt Cardiovascular Medicine

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start

1 juli 2016

Primaire voltooiing (Werkelijk)

1 juni 2020

Studie voltooiing (Werkelijk)

1 juni 2020

Studieregistratiedata

Eerst ingediend

21 juni 2016

Eerst ingediend dat voldeed aan de QC-criteria

27 juni 2016

Eerst geplaatst (Schatting)

30 juni 2016

Updates van studierecords

Laatste update geplaatst (Werkelijk)

27 mei 2022

Laatste update ingediend die voldeed aan QC-criteria

3 mei 2022

Laatst geverifieerd

1 mei 2022

Meer informatie

Termen gerelateerd aan deze studie

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • 160208

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

JA

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