Effect of DPP4 Inhibition on Vasoconstriction
Contribution of Neuropeptide Y (NPY) to Vasoconstriction and Sympathetic Activation in the Setting of Dipeptidyl Peptidase IV (DPP4) Inhibition
Přehled studie
Postavení
Postavení
Podmínky
Podmínky
Intervence / Léčba
Intervence / Léčba
Detailní popis
Typ studie
Typ studie
Zápis (Aktuální)
Zápis
Fáze
Fáze
- Fáze 4
Kontakty a umístění
Studijní místa
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Tennessee
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Nashville, Tennessee, Spojené státy, 37232
- Vanderbilt University Medical Center
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Kritéria účasti
Kritéria způsobilosti
Kritéria způsobilosti
Věk způsobilý ke studiu
Přijímá zdravé dobrovolníky
Pohlaví způsobilá ke studiu
Popis
Inclusion Criteria:
Type 2 Diabetes Mellitus, as defined by one or more of the following,
- Hgb A1C ≥6.5%, or
- Fasting plasma glucose ≥126mg/dL, or
- Two hour plasma glucose ≥200 mg/dL following 75gr oral glucose load
For female subjects the following conditions must be met:
- Postmenopausal status for at least 1 year, or
- Status post-surgical sterilization, or
- If of childbearing potential, utilization of some form of birth control and willingness to undergo β-HCG testing prior to drug treatment and on every study day
Exclusion Criteria:
- Type 1 diabetes.
- Poorly controlled T2DM, defined as Hgb A1C>8.7%.
- Use of anti-diabetic medications other than metformin.
- Hypertension.
- Subjects who have participated in a weight-reduction program during the last 6 months and whose weight has increased or decreased more than 5 kg over the preceding 6 months.
- Pregnancy. Breast-feeding.
- Treatment with any of the following drugs: cisapride, pimozide, terfenadine, astemizol
- Clinically significant gastrointestinal impairment that could interfere with drug absorption
- Cardiovascular disease that would pose risk for the subject to participate in the study, 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 AV block, mitral valve stenosis, or hypertrophic cardiomyopathy.
- Impaired hepatic function (aspartate amino transaminase [AST] and/or alanine amino transaminase [ALT] >2 x upper limit of normal range)
- Impaired renal function (eGFR< 60mL/min/1.73m2 as determined by the MDRD equation).
- History or presence of immunological or hematological disorders.
- History of pancreatitis or known pancreatic lesions.
- History of angioedema or cough while taking an ACE inhibitor.
- Hematocrit <35%.
- Treatment with anticoagulants.
- Growth hormone deficiency.
- Diagnosis of asthma requiring use of an inhaled β-2 agonist more than 1 time per week.
- 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 systemic glucocorticoids within the last 6 months.
- Treatment with lithium salts
- Ongoing tobacco use or recreational drug use.
- Treatment with any investigational drug in the 1 month preceding the study
- Mental conditions rendering the subject unable to understand the nature, scope, or 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
Studijní plán
Jak je studie koncipována?
Detaily designu
- Primární účel: Základní věda
- Přidělení: Randomizované
- Intervenční model: Crossover Assignment
- Maskování: Čtyřnásobek
Počet zbraní
Zbraně a zásahy
Skupina účastníků / ArmSkupina účastníků / Arm |
Intervence / LéčbaIntervence / Léčba |
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Jiný: Sitagliptin then Placebo
Subjects in this arm will receive sitagliptin 100 mg daily.
After one week of treatment, subjects will report for study day #1.
During the study day subjects will be given intra-aterial neuropeptide Y and enalaprilat.
A four week washout of medications will occur after the study day.
Subjects will then receive placebo for one week followed by study day #2.
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Subjects will receive sitagliptin 100 mg daily for 7 days prior to one of the study days.
Ostatní jména:
Subjects will receive a placebo capsule daily for 7 days prior to one of the study days.
Ostatní jména:
During the study days, neuropeptide Y will be infused through an intra-arterial line.
There will be four doses of neuropeptide Y used (0.1, 0.3, 1.0, and 3.0 nmol/min) and each dose will be infused for 10 minutes.
Ostatní jména:
Ninety minutes after the last dose of neuropeptide Y, enalaprilat will be infused through the intra-arterial line at 0.33 µg/min/100mL of forearm volume.
After 30 minutes, a second infusion of neuropeptide Y will begin.
Similar to the previous neuropeptide infusion, four doses of neuropeptide Y will be used (0.1, 0.3, 1.0, and 3.0 nmol/min) and each dose will be infused for 10 minutes.
Ostatní jména:
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Jiný: Placebo then Sitagliptin
Subjects in this arm will receive placebo for one week.
After this, subjects will report for study day #1.
During the study day subjects will be given intra-aterial neuropeptide Y and enalaprilat.
A four week washout of medications will occur after the study day.
Subjects will then receive 100 mg of sitagliptin daily for one week followed by study day #2.
|
Subjects will receive sitagliptin 100 mg daily for 7 days prior to one of the study days.
Ostatní jména:
Subjects will receive a placebo capsule daily for 7 days prior to one of the study days.
Ostatní jména:
During the study days, neuropeptide Y will be infused through an intra-arterial line.
There will be four doses of neuropeptide Y used (0.1, 0.3, 1.0, and 3.0 nmol/min) and each dose will be infused for 10 minutes.
Ostatní jména:
Ninety minutes after the last dose of neuropeptide Y, enalaprilat will be infused through the intra-arterial line at 0.33 µg/min/100mL of forearm volume.
After 30 minutes, a second infusion of neuropeptide Y will begin.
Similar to the previous neuropeptide infusion, four doses of neuropeptide Y will be used (0.1, 0.3, 1.0, and 3.0 nmol/min) and each dose will be infused for 10 minutes.
Ostatní jména:
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Komparátor placeba: Sitagliptin then Placebo: Valsartan
Subjects in this arm will receive sitagliptin 100 mg/d for one week as well as valsartan 160 mg/d for one week.
After this subjects will report for study day #1.
During the study day, subjects will be given intra-arterial neuropeptide Y.
A four week washout of medication will occur after the study day.
Subjects will then receive placebo/d and valsartan 160 mg/d for one week followed by study day #2.
|
Subjects will receive sitagliptin 100 mg daily for 7 days prior to one of the study days.
Ostatní jména:
Subjects will receive a placebo capsule daily for 7 days prior to one of the study days.
Ostatní jména:
Valsartan 160 mg/d for 7 days prior to one of the study days.
Ostatní jména:
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Komparátor placeba: Placebo then Sitagliptin: Valsartan
Subjects in this arm will receive placebo/d for one week as well as valsartan 160 mg/d for one week.
After this subjects will report for study day #1.
During the study day, subjects will be given intra-arterial neuropeptide Y.
A four week washout of medication will occur after the study day.
Subjects will then receive sitagliptin 100mg/d and valsartan 160 mg/d for one week followed by study day #2.
|
Subjects will receive sitagliptin 100 mg daily for 7 days prior to one of the study days.
Ostatní jména:
Subjects will receive a placebo capsule daily for 7 days prior to one of the study days.
Ostatní jména:
Valsartan 160 mg/d for 7 days prior to one of the study days.
Ostatní jména:
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Co je měření studie?
Primární výstupní opatření
Primární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
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Forearm Blood Flow
Časové okno: FBF measured after 5 min of the 1 nmol/min dose of neuropeptide Y on study days 1 and 2. Study days 1 and two were separated by five weeks.
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Forearm blood flow measured by strain gauge plethysmography in response to 1.0 nmol/min neuropeptide Y, the highest dose that all received.
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FBF measured after 5 min of the 1 nmol/min dose of neuropeptide Y on study days 1 and 2. Study days 1 and two were separated by five weeks.
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Sekundární výstupní opatření
Sekundární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
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Arterial Norepinephrine
Časové okno: Measured at baseline (time 0) prior to the infusion of neuropeptide Y on each study day. Study days 1 and 2 were separated by five weeks.
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Arterial norepinephrine concentration measured by high-performance liquid chromatography.
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Measured at baseline (time 0) prior to the infusion of neuropeptide Y on each study day. Study days 1 and 2 were separated by five weeks.
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Venous Norepinephrine
Časové okno: Measured at baseline (time 0) prior to the infusion of neuropeptide Y on each study day. Study days 1 and 2 were separated by five weeks.
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Venous norepinephrine concentration measured by high-performance liquid chromatography
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Measured at baseline (time 0) prior to the infusion of neuropeptide Y on each study day. Study days 1 and 2 were separated by five weeks.
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NPY Metabolites
Časové okno: Measured after 5 min infusion of the 1.0 nmol/min dose of neuropeptide Y on study days 1 and 2. Study days 1 and 2 were separated by five weeks.
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NPY (3-36) concentration measured by micro ultra-hgih pressure liquid chromatography tandem mass spectrometry. NPY (3-36) is the degradation product of NPY by dipeptidyl peptidase 4. It was measured only in the diabetics studied. |
Measured after 5 min infusion of the 1.0 nmol/min dose of neuropeptide Y on study days 1 and 2. Study days 1 and 2 were separated by five weeks.
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Insulin
Časové okno: Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days 1 and 2 were separated by five weeks, a four-week washout and one-week treatment period.
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Plasma insulin measured by radioimmunoassay.
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Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days 1 and 2 were separated by five weeks, a four-week washout and one-week treatment period.
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GLP-1
Časové okno: Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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GLP--1 was not analyzed as subjects were studied in the fasting state.
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Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Glucose
Časové okno: Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Glucose was measured by the glucose oxidase method using a YSI glucose analyzer
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Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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ACE Activity
Časové okno: Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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ACE activity was measured using a commercially available assay (Olympus AU400/AU600, Alpco Diagnotics, Salem, NH.)
The lower level of detection was 15 U/L and values below the level of detection were reported at half the level of detection.
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Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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DPP4 Activity
Časové okno: Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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DPP4 activity was measured by detection of cleavage of a colorimetric substrate.
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Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Low Frequency Variability of Blood Pressure Activity
Časové okno: Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Measured using the VITAL-GARD 450c monitor Ivy Biomedical Systems, Branford, CT, USA)
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Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Arterial tPA
Časové okno: Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Measured using an ELISA.
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Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Venous tPA
Časové okno: Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Measured using an ELISA.
This was measured in a few subjects.
After it was determined that there was no change in net t-PA release it was not measured in the remainder.
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Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Mean Arterial Pressure
Časové okno: Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Heart Rate
Časové okno: Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Measured at baseline (time 0) of each study day prior to the infusion of neuropeptide Y. Study days were separated by five weeks, a four-week washout and one-week treatment period.
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Spolupracovníci a vyšetřovatelé
Sponzor
Sponzor
Termíny studijních záznamů
Hlavní termíny studia
Začátek studia
Začátek studia
Primární dokončení (Aktuální)
Primární dokončení
Dokončení studie (Aktuální)
Dokončení studie
Termíny zápisu do studia
První předloženo
První předloženo
První předloženo, které splnilo kritéria kontroly kvality
První předloženo, které splnilo kritéria kontroly kvality
První zveřejněno (Odhad)
První zveřejněno
Aktualizace studijních záznamů
Poslední zveřejněná aktualizace (Aktuální)
Poslední zveřejněná aktualizace
Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality
Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality
Naposledy ověřeno
Naposledy ověřeno
Více informací
Termíny související s touto studií
Klíčová slova
Další relevantní podmínky MeSH
- Poruchy metabolismu glukózy
- Metabolické choroby
- Onemocnění endokrinního systému
- Diabetes Mellitus
- Diabetes mellitus, typ 2
- Hypoglykemická činidla
- Fyziologické účinky léků
- Molekulární mechanismy farmakologického působení
- Antihypertenziva
- Inhibitory enzymů
- Hormony
- Hormony, hormonální náhražky a antagonisté hormonů
- Inhibitory proteázy
- Inkretiny
- Blokátory receptoru angiotenzinu II typu 1
- Antagonisté receptoru angiotensinu
- Inhibitory dipeptidyl-peptidázy IV
- Inhibitory enzymu konvertujícího angiotensin
- Valsartan
- Enalaprilát
- Enalapril
- Sitagliptin fosfát
Další identifikační čísla studie
Další identifikační čísla studie
- 151133
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