Renin-Angiotensin and Fibrinolysis in Humans: Effect of Long-Term PDE5 Inhibition on Glucose Homeostasis
Studienübersicht
Status
Status
Bedingungen
Bedingungen
Intervention / Behandlung
Intervention / Behandlung
Studientyp
Studientyp
Einschreibung (Tatsächlich)
Einschreibung
Phase
Phase
- Phase 4
Kontakte und Standorte
Studienorte
-
-
Tennessee
-
Nashville, Tennessee, Vereinigte Staaten, 37232
- Vanderbilt University
-
-
Teilnahmekriterien
Zulassungskriterien
Zulassungskriterien
Studienberechtigtes Alter
Akzeptiert gesunde Freiwillige
Studienberechtigte Geschlechter
Beschreibung
Inclusion criteria:
Age > 18 years and BMI > 25 kg/M2 (> 23 kg/M2 among Asian Americans) Elevated fasting plasma glucose (100-125 mg/dL) IGT (2 hour plasma glucose 140-199 mg/dL) OR metabolic syndrome and/or hemoglobin A1c 5.7-6.4%
Exclusion criteria:
- Diabetes type 1 or type 2, as defined by a fasting glucose of 126 mg/dL or greater, a two hour plasma glucose of 200 mg/dL or greater, or the use of anti-diabetic medication.
- The use of nitrates or any disease that might require the use of nitrates.
- The use of any potent CYP3A4 inhibitor.
- subjects who have participated in a weight-reduction program during the last 6 month or whose weight has increased or decreased more than 2 kg over the preceding 6 months.
- Pregnancy. Women of child-bearing potential will be required to have undergone tubal ligation or to be using barrier methods of birth control.
- Breast-feeding.
- Cardiovascular disease such as myocardial infarction within 6 months prior to enrollment, presence of angina pectoris, significant arrhythmia, congestive heart failure (LV hypertrophy acceptable), deep vein thrombosis, pulmonary embolism, second or third degree heart block, mitral valve stenosis, aortic stenosis or hypertrophic cardiomyopathy.
- Treatment with anticoagulants.
- Treatment with metformin.
- History of serious neurologic disease such as cerebral hemorrhage, stroke, or transient ischemic attack.
- History or presence of immunological or hematological disorders.
- Diagnosis of asthma.
- Clinically significant gastrointestinal impairment that could interfere with drug absorption.
- Impaired hepatic function (aspartate amino transaminase [AST] and/or alanine amino.
transaminase [ALT] >1.5 x upper limit of normal range)
- Impaired renal function (serum creatinine >1.5 mg/dl).
- Hematocrit <35%.
- Any underlying or acute disease requiring regular medication which could possibly pose a threat to the subject or make implementation of the protocol or interpretation of the study results difficult.
Treatment with chronic systemic glucocorticoid therapy (more than 7 consecutive days in
1 month).
- Treatment with lithium salts.
- History of alcohol or drug abuse.
- Treatment with any investigational drug in the 1 month preceding the study.
- Mental conditions rendering the subject unable to understand the nature, scope and possible consequences of the study.
- Inability to comply with the protocol, e.g. uncooperative attitude, inability to return for follow-up visits, and unlikelihood of completing the study
Studienplan
Wie ist die Studie aufgebaut?
Designdetails
- Hauptzweck: Grundlegende Wissenschaft
- Zuteilung: Zufällig
- Interventionsmodell: Parallele Zuordnung
- Maskierung: Vervierfachen
Anzahl der Arme
Waffen und Interventionen
Teilnehmergruppe / ArmTeilnehmergruppe / Arm |
Intervention / BehandlungIntervention / Behandlung |
|---|---|
|
Experimental: sildenafil Aim 1
sildenafil 25 mg p.o. tid
|
Sildenafil 25 mg by mouth three times a day for three months
Subjects with prediabetes will have a baseline hyperglycemic clamp (Aim 1) and then receive sildenafil or placebo for 3 months.
Another hyperglycemic clamp will be performed followed by another 3 months off drug and an oral glucose tolerance test.
|
|
Placebo-Komparator: placebo Aim 1
matching placebo p.o. tid
|
Subjects with prediabetes will have a baseline hyperglycemic clamp (Aim 1) and then receive sildenafil or placebo for 3 months.
Another hyperglycemic clamp will be performed followed by another 3 months off drug and an oral glucose tolerance test.
Matching placebo three times a day for three months
|
|
Experimental: sildenafil Aim 2
sildenafil 25 mg p.o. tid
|
Sildenafil 25 mg by mouth three times a day for three months
Subjects with prediabetes will have a baseline euglycemic clamp (Aim 2) and then receive sildenafil or placebo for 3 months.
Another euglycemic clamp will be performed followed by another 3 months off drug and an oral glucose tolerance test.
|
|
Placebo-Komparator: placebo Aim 2
matching placebo p.o. tid
|
Matching placebo three times a day for three months
Subjects with prediabetes will have a baseline euglycemic clamp (Aim 2) and then receive sildenafil or placebo for 3 months.
Another euglycemic clamp will be performed followed by another 3 months off drug and an oral glucose tolerance test.
|
Was misst die Studie?
Primäre Ergebnismessungen
Primäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
|
Insulin Secretion
Zeitfenster: 2.5 hours after 3 months of therapy
|
in the group of subjects undergoing hyperglycemic clamp (Aim 1)
|
2.5 hours after 3 months of therapy
|
|
Index of Tissue Sensitivity to Insulin
Zeitfenster: 2.5 hours after 3 months of therapy
|
in the group of subjects undergoing hyperglycemic clamp (Aim 1), calculated by dividing the average glucose infusion rate during the last hour of the clamp by the average plasma insulin concentration during the same interval
|
2.5 hours after 3 months of therapy
|
|
Glucose Infusion Rate
Zeitfenster: 2.5 hours after 3 months of therapy
|
In the group of subjects undergoing euglycemic clamp (Aim 2)
|
2.5 hours after 3 months of therapy
|
Sekundäre Ergebnismessungen
Sekundäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
|
Fasting Plasma Glucose
Zeitfenster: 3 months
|
3 months
|
|
|
Blood Pressure
Zeitfenster: 3 months
|
Systolic blood pressure
|
3 months
|
Mitarbeiter und Ermittler
Sponsor
Sponsor
Ermittler
Ermittler
- Hauptermittler: Nancy J Brown, MD, Vanderbilt University
Publikationen und hilfreiche Links
Allgemeine Veröffentlichungen
- Ramirez CE, Nian H, Yu C, Gamboa JL, Luther JM, Brown NJ, Shibao CA. Treatment with Sildenafil Improves Insulin Sensitivity in Prediabetes: A Randomized, Controlled Trial. J Clin Endocrinol Metab. 2015 Dec;100(12):4533-40. doi: 10.1210/jc.2015-3415. Epub 2015 Nov 18.
- Ramirez CE, Shuey MM, Milne GL, Gilbert K, Hui N, Yu C, Luther JM, Brown NJ. Arg287Gln variant of EPHX2 and epoxyeicosatrienoic acids are associated with insulin sensitivity in humans. Prostaglandins Other Lipid Mediat. 2014 Oct;113-115:38-44. doi: 10.1016/j.prostaglandins.2014.08.001. Epub 2014 Aug 28.
Studienaufzeichnungsdaten
Haupttermine studieren
Studienbeginn
Studienbeginn
Primärer Abschluss (Tatsächlich)
Primärer Abschluss
Studienabschluss (Tatsächlich)
Studienabschluss
Studienanmeldedaten
Zuerst eingereicht
Zuerst eingereicht
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst gepostet (Schätzen)
Zuerst gepostet
Studienaufzeichnungsaktualisierungen
Letztes Update gepostet (Tatsächlich)
Letztes Update gepostet
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Zuletzt verifiziert
Zuletzt verifiziert
Mehr Informationen
Begriffe im Zusammenhang mit dieser Studie
Schlüsselwörter
Zusätzliche relevante MeSH-Bedingungen
Andere Studien-ID-Nummern
Andere Studien-ID-Nummern
- 110206
Diese Informationen wurden ohne Änderungen direkt von der Website clinicaltrials.gov abgerufen. Wenn Sie Ihre Studiendaten ändern, entfernen oder aktualisieren möchten, wenden Sie sich bitte an register@clinicaltrials.gov. Sobald eine Änderung auf clinicaltrials.gov implementiert wird, wird diese automatisch auch auf unserer Website aktualisiert .