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インクレチン分泌におけるホスホジエステラーゼ阻害剤の役割

2026年11月7日 更新者:National Institute on Aging (NIA)

Background:

The drug Roflumilast (Daliresp) is used to treat Chronic Obstructive Pulmonary Disease (COPD). COPD is a lung disease that makes it difficult to breathe. Studies have shown that this drug decreased the blood sugar of people with type 2 diabetes. Sitagliptin (Januvia) is a medication presently used to treat diabetes. Researchers think that both of these drugs may decrease blood sugar by causing an increase in the hormone GLP-1.This hormone is secreted in the small intestines and stomach and is also known as an incretin. Researchers want to study how these drugs affect blood sugar, insulin, and other hormones in the blood.

Objectives:

  • To study the effects of Roflumilast (Daliresp) and Sitagliptin (Januvia) on blood sugar and insulin.
  • To better understand GLP-1 and other gut hormones. This may lead to new treatments for type 2 diabetes.

Eligibility:

  • Healthy volunteers age 21 55.
  • Body Mass Index (BMI) less than 30

Design:

-This study will require one screening visit and four study visits, scheduled about 3-weeks apart.

Screening visit requires participants to arrive after fasting for 10 hours and have the following:

  • Medical history, physical exam, height, weight, blood pressure measurements and blood and urine tests.
  • A 2-hour oral glucose tolerance test (OGTT). Participants will drink an orange-flavored drink containing 75 grams of sugar (300 calories). A blood sample will be taken prior to drinking the beverage and 2-hours later.
  • An electrocardiogram (EKG) to measure the electrical activity of the heart.
  • Questionnaires about risk for depression or suicide.

Study visits 1to 4:

  • Participants will arrive the evening prior and blood work will be done to confirm eligibility. They will not eat or drink anything except water starting at 8:00 p.m.

  • About 6:30 a.m. the following day, an I.V. (small plastic tube) will be placed in an arm vein and used to take 20 blood samples over a period of about 11 hours.

  • Participants will receive one of the following study medication/placebo groupings in random order:

    1. Roflumilast (Daliresp) 500 mcg pill; and 1 placebo pill
    2. Sitaglipitin (Januvia) 100 mg pill; and 1 placebo pill
    3. Roflumilast (Daliresp) 500 mcg pill; and Sitagliptin (Januvia) 100 mg pill
    4. 2 placebo pills
  • One hour later, they will have a 10-hour mixed meal test (MMT). They will be asked to drink a nutritional shake (Ensure Plus). Blood samples will be taken over the next 10 hours to measure blood sugar, insulin and other hormones. At the end of the test, they will be given a meal.

  • Participants will answer questions about side effects and symptoms. They will receive a follow-up phone call within 10 days.

調査の概要

状態

完了

条件

介入・治療

詳細な説明

Objectives and Specific Aims:

We plan to investigate whether phosphodiesterases are involved in the regulation of glucagon-like peptide-1 (GLP-1) secretion from L cells in humans. We hypothesize that: (1) phosphodiesterase-4D (PDE4D) inhibitor (roflumilast) enhance GLP-1 secretion from L cells; (2) PDE4D inhibitor (roflumilast) and DPP4 inhibitor (sitagliptin) have synergistic effect on increasing the amount of circulating active GLP-1.

Experimental Design and Methods:

Twenty healthy adults, age 21-55, will be recruited for this study. This is a randomized, double-blind, placebo-controlled cross-over study. Each subject will serve as his/her own control and each person will have four different study visits spaced about 3 weeks apart. During each visit, they will receive one of the following medications (oral route) in random order:

  1. Roflumilast (Daliresp) 500 mcg + Placebo
  2. Sitagliptin (Januvia) 100 mg + Placebo
  3. Roflumilast (Daliresp) 500 mcg + Sitagliptin (Januvia) 100 mg
  4. Placebo

A 10-hr mixed-meal test will be administered 1 hour after the medications and frequent blood-samplings will be done over 10 hours.

Medical Relevance and Expected Outcome:

Preliminary clinical data have shown that phosphodiesterase inhibitors improved glycemic control in type 2 diabetes, and pre-clinical animal data have shown that phosphodiesterase inhibitors enhanced GLP-1 secretion from L cells. The application of novel, pre-clinical findings to an understanding of human biology and pathobiology is of fundamental and critical importance. This study will give us a better understanding of the regulators of GLP-1 secretion in humans, and this new understanding may lead to new treatments for type 2 diabetes.

研究の種類

介入

入学 (実際)

29

段階

  • フェーズ 1

連絡先と場所

このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。

研究場所

    • Maryland
      • Baltimore、Maryland、アメリカ、21224
        • National Institute of Aging, Clinical Research Unit

参加基準

研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。

適格基準

就学可能な年齢

21年~55年 (大人)

健康ボランティアの受け入れ

いいえ

受講資格のある性別

全て

説明

  • INCLUSION CRITERIA:

    1. Age 21-55 (Age restriction is used to remove age as a confounding factor because (beta) cells function and insulin resistance tend to deteriorate with age and may affect GLP-1 and GIP levels.

    2. Screening laboratory evaluations with no clinically significant abnormal results (minor deviations from normal lab results will be at the discretion of the principal investigator):

      1. fasting comprehensive metabolic panel
      2. complete blood count with differential and platelet
      3. thyroid function test (TSH)
      4. urine drug screen
      5. Point of care urine pregnancy test (for women who are not surgically sterile)
    3. BMI < 30 (participants with BMI greater than or equal to 30 are excluded because obesity has been associated with attenuation in GLP-1 secretion.

    4. Have had a history of stable weight (maintained weight within +/- 5%) over the past year

    5. Have NOT participated in another clinical trial involving any pharmacologic agents within the past 30 days

    6. Able to complete an inform consent

    7. Agree to not participate in other clinical trials within the study period (at the discretion of the study investigator)

EXCLUSION CRITERIA:

  1. FPG greater than or equal to 100 mg/dl or 2-hr OGTT greater than or equal to 140 mg/dL (evidence of glucose intolerance or diabetes)
  2. History of anemia, or Hemoglobin < 12.5 mg/dL for men and < 11.5 mg/dL for women during screening visit
  3. Weight < 110 pounds (due to blood volume requirement)
  4. Evidence of illicit drug use
  5. History of substance abuse including marijuana within the past 6 months
  6. History of smoking any tobacco products within six months prior to screening
  7. Alcohol intake > 30 grams (drink more than 2 beers per day OR equivalent amount of alcohol)
  8. History of Human Immunodeficiency Virus (HIV) infection
  9. History of active or chronic Hepatitis B and/or C infection
  10. History of psychiatric illnesses including major depressive disorder, schizophrenia, bipolar disorder
  11. Any lifetime history of suicide attempt
  12. History of any suicidal ideation of type 4 or 5 on the Columbia-Suicide Severity Rating Scale (C-SSRS) in the last year
  13. Any suicidal ideation of type 4 or 5 on the C-SSRS during any follow-up visits.
  14. Patient Health Questionnaire-9 (PHQ-9) score greater than or equal to 10 during screening visit or any follow-up study visits
  15. Generalized Anxiety Disorder-7 (GAD-7) score greater than or equal to 10 during screening visit or any follow-up visits
  16. History of pancreatitis
  17. History of liver or renal diseases
  18. History of gastrointestinal or endocrine disorders
  19. History of malignancy (unless P.I. determines that there is no impact of the prior malignancy on study outcomes, i.e. basal cell skin cancer)
  20. History of coronary disease or clinically significant abnormalities on electrocardiogram
  21. History of seizures or other neurologic diseases
  22. History of glucocorticoid use (over one month) or other immunosuppressive agents (any), i.e. Imuran, Neoral, Sandimmune, SangCya, basiliximab (Simulect), daclizumab (Zenapax), muromonab (Orthocolone OKT(3)) prednisone (Deltasone, Orasone) within the past six months
  23. Use of proton pump inhibitors (PPI s), i.e. Prilosec, Prevacid, Achiphex, Protonix, Nexium, Zegarid
  24. Women who are pregnant or nursing/breast-feeding a child
  25. Any medical history that, in the opinion of the investigator(s), may make participation of the subject in the study unsafe

研究計画

このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。

研究はどのように設計されていますか?

デザインの詳細

  • 主な目的:基礎科学
  • 割り当て:ランダム化
  • 介入モデル:階乗代入
  • マスキング:ダブル

武器と介入

参加者グループ / アーム
介入・治療
プラセボコンパレーター:Placebo

randomized, double-blind, placebo-controlled cross-over study

mixed meal

実験的:Roflumilast

randomized, double-blind, placebo-controlled cross-over study

mixed meal

This is already known to increase GLP-1 &amp; GIP secretion

実験的:Roflumilast/Sitaglip

randomized, double-blind, placebo-controlled cross-over study

mixed meal

Both Roflumilast and Sitagliptin together

実験的:Sitagliptin

randomized, double-blind, placebo-controlled cross-over study

mixed meal

This is already known to increase GLP-1 &amp; GIP secretion.

この研究は何を測定していますか?

主要な結果の測定

結果測定
メジャーの説明
時間枠
PDE4 inhibitor roflumilast enhances GLP-1 secretion from L cells.
時間枠:1-10 hours after ingestion

GIP &amp; GLP-1 response to a mixed meal.

1-10 hours after ingestion

二次結果の測定

結果測定
メジャーの説明
時間枠
5.PDE4 inhibitor roflumilast and DPP4 inhibitor sitagliptin have synergistic effect on glucose metabolism involving plasma glucose, insulin, ghrelin, glucagon, pancreatic polypeptide, C-peptide and fibroblast growth factor (FGF) 19, 21, 23.
時間枠:1-10 hours after ingestion

The hormones listed are measured by ELISA

1-10 hours after ingestion
4.PDE4 inhibitor roflumilast has an effect on glucose metabolism involving plasma glucose, insulin, ghrelin, glucagon, pancreatic polypeptide, C-peptide and fibroblast growth factor (FGF) 19, 21, 23.
時間枠:1-10 hours after ingestion

The hormones listed are measured by ELISA

1-10 hours after ingestion
3.PDE4 inhibitor roflumilast and DPP4 inhibitor sitagliptin have synergistic effect on elevating circulating active GIP levels.
時間枠:1-10 hours after ingestion

GIP secretion in response to a mixed meal

1-10 hours after ingestion
2.PDE4 inhibitor roflumilast enhances GIP secretion from K cells.
時間枠:1-10 hours after ingestion

GIP secretion in response to a mixed meal

1-10 hours after ingestion
1.PDE4 inhibitor roflumilast and DPP4 inhibitor sitagliptin have synergistic effect on elevating circulating active GLP-1 levels.
時間枠:1-10 hours after ingestion

GLP-1 secretion in response to mixed meal

1-10 hours after ingestion

協力者と研究者

ここでは、この調査に関係する人々や組織を見つけることができます。

スポンサー

捜査官

  • 主任研究者:Chee W Chia, M.D.、National Institute on Aging (NIA)

研究記録日

これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。

主要日程の研究

研究開始

2015年2月13日

一次修了 (実際)

2016年9月19日

研究の完了 (実際)

2016年9月19日

試験登録日

最初に提出

2015年2月13日

QC基準を満たした最初の提出物

2015年2月13日

最初の投稿 (推定)

2015年2月16日

学習記録の更新

投稿された最後の更新 (実際)

2026年11月10日

QC基準を満たした最後の更新が送信されました

2026年11月7日

最終確認日

2026年3月11日

詳しくは

本研究に関する用語

その他の研究ID番号

  • 999915074
  • 15-AG-N074

個々の参加者データ (IPD) の計画

個々の参加者データ (IPD) を共有する予定はありますか?

未定

IPD プランの説明

NIA IRP are in discussion and a plan has not been finalized.

医薬品およびデバイス情報、研究文書

米国FDA規制医薬品の研究

はい

米国FDA規制機器製品の研究

いいえ

この情報は、Web サイト clinicaltrials.gov から変更なしで直接取得したものです。研究の詳細を変更、削除、または更新するリクエストがある場合は、register@clinicaltrials.gov。 までご連絡ください。 clinicaltrials.gov に変更が加えられるとすぐに、ウェブサイトでも自動的に更新されます。