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Effect of DPP4 Inhibition on Vasoconstriction

2018년 7월 27일 업데이트: Nancy J. Brown, MD, Vanderbilt University

Contribution of Neuropeptide Y (NPY) to Vasoconstriction and Sympathetic Activation in the Setting of Dipeptidyl Peptidase IV (DPP4) Inhibition

The purpose of this study is to understand how dipeptidyl peptidase IV (DPP4) inhibition in diabetics affects hemodynamic parameters and sympathetic activation in the setting of increasing concentrations of neuropeptide Y, an endogenous peptide. The central hypothesis is that DPP4 inhibition decreases degradation of neuropeptide Y, resulting in increased vasoconstriction and sympathetic activation.

연구 개요

상태

완전한

정황

개입 / 치료

상세 설명

Dipeptidyl peptidase IV (DPP4) inhibitors are routinely used for the treatment of type II diabetes mellitus (T2DM). Since the prevalence of hypertension is 1.5-3 times greater in diabetics compared to sex-aged matched controls, the use of antihypertensives such as ACE inhibitors is also common in diabetics. DPP4 is involved in the degradation of multiple vasoactive peptides, one of which is neuropeptide Y. This peptide is thought to play a role in blood pressure regulation and sympathetic nervous system activation. The aim of this study is to investigate how DPP4 inhibition affects vasoconstriction in response to increasing neuropeptide Y concentrations. Additionally, the investigators want to understand how the combination of DPP4 inhibition and ACE inhibition affects vasoconstriction and sympathetic activation. Understanding the hemodynamic and neurohumoral changes associated with DPP4 and ACE inhibitors has important implications for the millions of patients with T2DM who take these drugs concurrently.

연구 유형

중재적

등록 (실제)

18

단계

  • 4단계

연락처 및 위치

이 섹션에서는 연구를 수행하는 사람들의 연락처 정보와 이 연구가 수행되는 장소에 대한 정보를 제공합니다.

연구 장소

  • 미국
    • Tennessee
      • Nashville, Tennessee, 미국, 37232
        • Vanderbilt University Medical Center

참여기준

연구원은 적격성 기준이라는 특정 설명에 맞는 사람을 찾습니다. 이러한 기준의 몇 가지 예는 개인의 일반적인 건강 상태 또는 이전 치료입니다.

자격 기준

공부할 수 있는 나이

18년 (성인)

건강한 자원 봉사자를 받아들입니다

아니

연구 대상 성별

모두

설명

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

공부 계획

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연구는 어떻게 설계됩니까?

디자인 세부사항

  • 주 목적: 기초 과학
  • 할당: 무작위
  • 중재 모델: 크로스오버 할당
  • 마스킹: 네 배로

무기와 개입

참가자 그룹 / 팔
개입 / 치료
다른: 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.
의약품: Sitagliptin
Subjects will receive sitagliptin 100 mg daily for 7 days prior to one of the study days.
다른 이름들:
  • 야누비아
의약품: Placebo
Subjects will receive a placebo capsule daily for 7 days prior to one of the study days.
다른 이름들:
  • 미결정셀룰로오스
의약품: Neuropeptide Y
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.
다른 이름들:
  • NPY
의약품: Enalaprilat
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.
다른 이름들:
  • Vasotec I.V.
다른: 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.
의약품: Sitagliptin
Subjects will receive sitagliptin 100 mg daily for 7 days prior to one of the study days.
다른 이름들:
  • 야누비아
의약품: Placebo
Subjects will receive a placebo capsule daily for 7 days prior to one of the study days.
다른 이름들:
  • 미결정셀룰로오스
의약품: Neuropeptide Y
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.
다른 이름들:
  • NPY
의약품: Enalaprilat
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.
다른 이름들:
  • Vasotec I.V.
위약 비교기: 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.
의약품: Sitagliptin
Subjects will receive sitagliptin 100 mg daily for 7 days prior to one of the study days.
다른 이름들:
  • 야누비아
의약품: Placebo
Subjects will receive a placebo capsule daily for 7 days prior to one of the study days.
다른 이름들:
  • 미결정셀룰로오스
의약품: Valsartan 160mg
Valsartan 160 mg/d for 7 days prior to one of the study days.
다른 이름들:
  • valsartan p.o.
위약 비교기: 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.
의약품: Sitagliptin
Subjects will receive sitagliptin 100 mg daily for 7 days prior to one of the study days.
다른 이름들:
  • 야누비아
의약품: Placebo
Subjects will receive a placebo capsule daily for 7 days prior to one of the study days.
다른 이름들:
  • 미결정셀룰로오스
의약품: Valsartan 160mg
Valsartan 160 mg/d for 7 days prior to one of the study days.
다른 이름들:
  • valsartan p.o.

연구는 무엇을 측정합니까?

주요 결과 측정

결과 측정
측정값 설명
기간
Forearm Blood Flow
기간: 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.
Forearm blood flow measured by strain gauge plethysmography in response to 1.0 nmol/min neuropeptide Y, the highest dose that all received.
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.

2차 결과 측정

결과 측정
측정값 설명
기간
Arterial Norepinephrine
기간: 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.
Arterial norepinephrine concentration measured by high-performance liquid chromatography.
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.
Venous Norepinephrine
기간: 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.
Venous norepinephrine concentration measured by high-performance liquid chromatography
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.
NPY Metabolites
기간: 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.

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.
Insulin
기간: 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.
Plasma insulin measured by radioimmunoassay.
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.
GLP-1
기간: 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.
GLP--1 was not analyzed as subjects were studied in the fasting state.
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.
Glucose
기간: 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.
Glucose was measured by the glucose oxidase method using a YSI glucose analyzer
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.
ACE Activity
기간: 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.
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.
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.
DPP4 Activity
기간: 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.
DPP4 activity was measured by detection of cleavage of a colorimetric substrate.
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.
Low Frequency Variability of Blood Pressure Activity
기간: 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.
Measured using the VITAL-GARD 450c monitor Ivy Biomedical Systems, Branford, CT, USA)
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.
Arterial tPA
기간: 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.
Measured using an ELISA.
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.
Venous tPA
기간: 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.
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.
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.
Mean Arterial Pressure
기간: 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.
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.
Heart Rate
기간: 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.
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.

공동 작업자 및 조사자

여기에서 이 연구와 관련된 사람과 조직을 찾을 수 있습니다.

스폰서

Vanderbilt University

연구 기록 날짜

이 날짜는 ClinicalTrials.gov에 대한 연구 기록 및 요약 결과 제출의 진행 상황을 추적합니다. 연구 기록 및 보고된 결과는 공개 웹사이트에 게시되기 전에 특정 품질 관리 기준을 충족하는지 확인하기 위해 국립 의학 도서관(NLM)에서 검토합니다.

연구 주요 날짜

연구 시작

2015년 12월 1일

기본 완료 (실제)

2017년 6월 1일

연구 완료 (실제)

2017년 9월 1일

연구 등록 날짜

최초 제출

2015년 12월 16일

QC 기준을 충족하는 최초 제출

2015년 12월 20일

처음 게시됨 (추정)

2015년 12월 24일

연구 기록 업데이트

마지막 업데이트 게시됨 (실제)

2018년 8월 27일

QC 기준을 충족하는 마지막 업데이트 제출

2018년 7월 27일

마지막으로 확인됨

2018년 7월 1일

추가 정보

이 연구와 관련된 용어

키워드

추가 관련 MeSH 약관

기타 연구 ID 번호

  • 151133

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