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Pilot Study of Mitochondrial Biology in Human Platelets

30 juni 2017 bijgewerkt door: National Heart, Lung, and Blood Institute (NHLBI)

Type II diabetes mellitus is rapidly becoming a global pandemic with a deleterious impact on cardiovascular morbidity and mortality. Understanding its pathophysiology is important for the development of future therapeutic interventions. Emerging evidence suggests interplay between mitochondrial dysfunction and the development of insulin resistance. Interestingly, mitochondrial dysfunction in skeletal muscle and adipose tissue are early events in the development of type II diabetes mellitus and are proposed to play a role in exacerbating insulin resistance. Although it has been demonstrated that skeletal muscle of insulin-resistant individuals has reduced mitochondria and mitochondrial dysfunction, whether this disruption of mitochondrial function is more widespread has not been explored. We hypothesize that this disruption of mitochondrial function is more systemic and thereby may contribute to the development of peripheral insulin resistance and possibly promote the myriad of complications associated with diabetes.

To test these assumptions, we propose an initial proof of concept study to evaluate mitochondrial biology in human platelets in normal volunteers, pre-diabetic and diabetic subjects to assess whether mitochondrial disruption/dysfunction evolves with the progression to type II diabetes. In parallel, proteomic analysis will be performed to evaluate whether the development of insulin resistance and diabetes confers a specific modulation in the biological signature of human platelets with disease progression. To delineate these concepts, we will evaluate study subject's glucose tolerance and insulin sensitivity and draw blood in parallel to study their platelets. Biological readouts will include: 1) the quantification of the mitochondrial proteome and electron transfer chain content; 2) the evaluation of platelet mitochondrial respiratory function and 3) to determine the mitochondrial reactive oxygen species capacity and defenses. If this hypothesis is validated, this study will show that the mitochondrial disruption/dysfunction is a more generalized finding in type II diabetes. Additionally, it would propose the use of platelets as potential biomarkers for early detection of mitochondrial function and assessment of disease. Finally, this would establish a peripheral blood readout of the modification of mitochondrial function as a novel approach to monitor the prevention and/or reversal of insulin resistance and diabetes in response to therapeutic strategies.

Studie Overzicht

Toestand

Voltooid

Conditie

Gedetailleerde beschrijving

Type II diabetes mellitus is rapidly becoming a global pandemic with a deleterious impact on cardiovascular morbidity and mortality. Understanding its pathophysiology is important for the development of future therapeutic interventions. Emerging evidence suggests interplay between mitochondrial dysfunction and the development of insulin resistance. Interestingly, mitochondrial dysfunction in skeletal muscle and adipose tissue are early events in the development of type II diabetes mellitus and are proposed to play a role in exacerbating insulin resistance. Although it has been demonstrated that skeletal muscle of insulin-resistant individuals has reduced mitochondria and mitochondrial dysfunction, whether this disruption of mitochondrial function is more widespread has not been explored. We hypothesize that this disruption of mitochondrial function is more systemic and thereby may contribute to the development of peripheral insulin resistance and possibly promote the myriad of complications associated with diabetes.

To test these assumptions, we propose an initial proof of concept study to evaluate mitochondrial biology in human platelets in normal volunteers, pre-diabetic and diabetic subjects to assess whether mitochondrial disruption/dysfunction evolves with the progression to type II diabetes. In parallel, proteomic analysis will be performed to evaluate whether the development of insulin resistance and diabetes confers a specific modulation in the biological signature of human platelets with disease progression. To delineate these concepts, we will evaluate study subject's glucose tolerance and insulin sensitivity and draw blood in parallel to study their platelets. Biological readouts will include: 1) the quantification of the mitochondrial proteome and electron transfer chain content; 2) the evaluation of platelet mitochondrial respiratory function and 3) to determine the mitochondrial reactive oxygen species capacity and defenses. If this hypothesis is validated, this study will show that the mitochondrial disruption/dysfunction is a more generalized finding in type II diabetes. Additionally, it would propose the use of platelets as potential biomarkers for early detection of mitochondrial function and assessment of disease. Finally, this would establish a peripheral blood readout of the modification of mitochondrial function as a novel approach to monitor the prevention and/or reversal of insulin resistance and diabetes in response to therapeutic strategies.

Studietype

Observationeel

Inschrijving (Werkelijk)

18

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
    • Maryland
      • Bethesda, Maryland, Verenigde Staten, 20892
        • National Institutes of Health Clinical Center, 9000 Rockville Pike

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 60 jaar (Volwassen)

Accepteert gezonde vrijwilligers

Nee

Geslachten die in aanmerking komen voor studie

Allemaal

Beschrijving

  • ELIGIBILITY CRITERIA:

Inclusion Criteria (young control group):

  1. Adults older than 21 years and less than 40 years.
  2. Insulin sensitivity with a fasting glucose less than 100 mg/dl and a 2-hour post oral glucose tolerance test blood glucose less than 140 mg/dl.
  3. Subject understands protocol and provides written, informed consent.

Inclusion Criteria (young insulin-resistant group):

  1. Adults older than 21 years and less than 40 years.
  2. Insulin resistance as defined by a fasting blood sugar of greater than or equal to 100mg/dl but less than 125 mg/dl and/or a 2-hour post oral glucose tolerance test blood glucose greater than 140 mg/dl and less than 200 mg/dl.
  3. Subject understands protocol and provides written, informed consent.

Inclusion Criteria (middle age control group):

  1. Adults greater than or equal to 40 years and less than or equal to 60 years.
  2. Insulin sensitivity with a fasting blood glucose less than 100 mg/dl and a 2-hour post oral glucose tolerance test blood glucose less than 140 mg/dl.
  3. Subject understands protocol and provides written, informed consent.

Inclusion Criteria (middle age insulin-resistant group):

  1. Adults greater than or equal to 40 years and less than or equal to 60 years.
  2. Insulin resistance as defined by a fasting blood sugar of greater than or equal to 100mg/dl but less than 125 mg/dl and/or a 2-hour post oral glucose tolerance test blood glucose greater than 140 mg/dl and less than 200 mg/dl.
  3. Subject understands protocol and provides written, informed consent.

Inclusion Criteria (middle age type II diabetes group):

  1. Adults greater than or equal to 40 years and less than or equal to 60 years.
  2. Type II diabetes as defined by a fasting blood sugar of greater than 125 mg/dl and/or a 2-hour post oral glucose tolerance test blood glucose greater than 200 mg/dl if untreated and/or if subjects are on oral hypoglycemic agent therapy where the HbA1c is greater than 6.7 percent.
  3. Subject understands protocol and provides written, informed consent.

Exclusion Criteria (all study subjects) :

  1. Uncontrolled hypertension, heart failure, unstable coronary artery disease or symptomatic peripheral arterial disease requiring changes in medication or medical intervention in the preceding 3 months.
  2. Insulin-dependant diabetes mellitus or current use of thiazolidinediones.
  3. Women of childbearing age unless recent pregnancy test is negative and are not breast feeding.
  4. Serum creatinine greater than 2.5 mg/dl.
  5. Liver transaminase levels greater than 2.5 times upper limit of normal.
  6. History of cancer treated with chemotherapy or irradiation in the last 5 years.
  7. Active inflammatory disease, or infection, or abnormal white blood cell differential.
  8. Enrollment in any drug studies within the last 30 days.
  9. BMI greater than 35 for the middle age groups and greater than 30 for the younger subjects.
  10. Age greater than 60 years.
  11. Another member of a potential study subject's immediate family has been recruited/participated in this study.
  12. The use of anticoagulation therapy, thiazide diuretics, corticosteroids, or some psychiatric drugs that cannot be stopped for medical reasons for a few days for study participation.

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

Medewerkers en onderzoekers

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

Sponsor

National Heart, Lung, and Blood Institute (NHLBI)

Publicaties en nuttige links

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Algemene publicaties

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

27 januari 2009

Studie voltooiing

24 oktober 2011

Studieregistratiedata

Eerst ingediend

30 januari 2009

Eerst ingediend dat voldeed aan de QC-criteria

30 januari 2009

Eerst geplaatst (Schatting)

2 februari 2009

Updates van studierecords

Laatste update geplaatst (Werkelijk)

2 juli 2017

Laatste update ingediend die voldeed aan QC-criteria

30 juni 2017

Laatst geverifieerd

24 oktober 2011

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • 090068
  • 09-H-0068

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