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Mitochondrial Dysfunction in Diabetes (PGC-1)

8. mai 2014 oppdatert av: Lawrence Mandarino, Mayo Clinic

PGC-1 and Mitochondrial Dysfunction in Diabetes, Aims 4 & 5

The purpose of this study is to determine whether insulin resistance is accompanied by "exercise resistance". Investigators will use mass spectrometry and proteomics analysis to test the hypothesis is that a bout of exercise that increases mitochondrial protein abundance in lean, healthy individuals is less effective in insulin resistant patients.

Studieoversikt

Status

Fullført

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

The investigators' prior research has focused on defining the changes in expression of nuclear encoded mitochondrial genes that predict changes in insulin sensitivity in skeletal muscle, with the goal of defining the molecular mechanisms underlying the connection between mitochondrial dysfunction and insulin resistance in skeletal muscle.

Three groups of subjects will be studied: lean, healthy control subjects (n=12) obese non-diabetic subjects (n=12) and patients with type 2 Diabetes Mellitus (n=12) for a total of 36 subjects. Twenty subjects have completed the study at Arizona State University; the remaining 16 subjects will be accrued at the Mayo Clinic in Arizona.

Subjects will come to the Mayo Clinic 4 times. On Study Day 1 Subjects will be screened with a medical history & physical and a 75 g oral glucose tolerance test to determine if they are eligible for the study. On Study Day 2, subjects will report to the clinic after an overnight fast, undergo a euglycemic clamp (using deuterated glucose) to determine insulin sensitivity, and in addition have a muscle biopsy (basal biopsy for comparison). On Study Day 3, subjects will report to the clinic after an overnight fast, and undergo a Volume Oxygen Maximum (VO_2 max) determination. On Study Day 4, subjects will report to the clinic after an overnight fast to perform an exercise bout with muscle biopsy 30 minutes after the end of exercise. This will be followed by an overnight fast, and an additional muscle biopsy at 24 hours post exercise.

Studietype

Intervensjonell

Registrering (Faktiske)

16

Fase

  • Ikke aktuelt

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiesteder

  • Forente stater
    • Arizona
      • Scottsdale, Arizona, Forente stater, 85259
        • Mayo Clinic in Arizona

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

21 år til 55 år (Voksen)

Tar imot friske frivillige

Ja

Kjønn som er kvalifisert for studier

Alle

Beskrivelse

Inclusion Criteria

  1. Subjects must be able to communicate meaningfully with the investigator and must be legally competent to provide written informed consent.
  2. Subjects may be of either sex with age as described in each protocol. Female subjects must be non-lactating and will be eligible only if they have a negative pregnancy test throughout the study period.
  3. Subjects must range in age as described in each specific protocol.

  4. Subjects must have the following laboratory values:

    1. Hematocrit ≥ 35 vol%
    2. Serum creatinine ≤ 1.6 mg/dl
    3. Aspartate Aminotransferase (AST) (SGOT) < 2 times upper limit of normal
    4. Alanine Aminotransferase (ALT) (SGPT) < 2 times upper limit of normal
    5. Alkaline phosphatase < 2 times upper limit of normal
    6. Triglycerides < 150 mg/dl.
    7. Prothrombin Time (PT) 11.7 -14.3 seconds (during Intralipid/heparin infusion,PT will be determined to insure that it is < 1.5-2.0 times the normal value.)
    8. Partial thromboplastin time (PTT) 23.0-37.0 seconds.

Exclusion Criteria

  1. Subjects must not be receiving any of the following medications: thiazide or furosemide diuretics, beta-blockers, or other chronic medications with known adverse effects on glucose tolerance levels unless the patient has been on a stable dose of such agents for the past three months before entry into the study. Subjects may be taking a stable dose of estrogens or other hormonal replacement therapy, if the subject has been on these agents for the prior three months. Subjects taking systemic glucocorticoids are excluded.
  2. Subjects with a history of clinically significant heart disease (New York Heart Classification greater than grade II; more than non-specific ST-T wave changes on the EKG), peripheral vascular disease (history of claudication), or pulmonary disease (dyspnea on exertion of one flight or less; abnormal breath sounds on auscultation) will not be studied.
  3. Recent systemic or pulmonary embolus, untreated high-risk proliferative retinopathy, recent retinal hemorrhage, uncontrolled hypertension, systolic BP>180, diastolic BP>105, autonomic neuropathy, resting heart rate >100, electrolyte abnormalities.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Grunnvitenskap
  • Tildeling: Ikke-randomisert
  • Intervensjonsmodell: Parallell tildeling
  • Masking: Ingen (Open Label)

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Eksperimentell: Obese Non-Diabetic Subjects
All subjects on this arm will undergo exercise and muscle biopsies.
Atferdsmessig: Exercise and muscle biopsies
Subjects will undergo a euglycemic clamp, VO_2 max determination, exercise periods and muscle biopsies.
Eksperimentell: Type 2 Diabetic Subjects
All subjects on this arm will undergo exercise and muscle biopsies.
Atferdsmessig: Exercise and muscle biopsies
Subjects will undergo a euglycemic clamp, VO_2 max determination, exercise periods and muscle biopsies.
Eksperimentell: Healthy Control Subjects
All subjects on this arm will undergo exercise and muscle biopsies.
Atferdsmessig: Exercise and muscle biopsies
Subjects will undergo a euglycemic clamp, VO_2 max determination, exercise periods and muscle biopsies.

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Protein Concentration of Mitochondria
Tidsramme: Study Day 4 (30 min after exercise) and (24 hours after exercise)
Protein concentration will be determined from muscle biopsies by the method of Lowry. 75 micrograms of muscle lysate proteins will be separated on a 10% Sodium Dodecyl Sulfate Polyacrylamide Gel, and then visualized with Coomassie stain. The gel lane will be cut into cubes, digested with trypsin and cleaned, then protein abundance will be determined using spectral counting.
Study Day 4 (30 min after exercise) and (24 hours after exercise)

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Mayo Clinic

Samarbeidspartnere

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

Etterforskere

  • Hovedetterforsker: Lawrence Mandarino, Ph.D., Mayo Clinic

Publikasjoner og nyttige lenker

Den som er ansvarlig for å legge inn informasjon om studien leverer frivillig disse publikasjonene. Disse kan handle om alt relatert til studiet.

Hjelpsomme linker

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart

1. september 2012

Primær fullføring (Faktiske)

1. mars 2014

Studiet fullført (Faktiske)

1. mars 2014

Datoer for studieregistrering

Først innsendt

7. november 2012

Først innsendt som oppfylte QC-kriteriene

7. november 2012

Først lagt ut (Anslag)

9. november 2012

Oppdateringer av studieposter

Sist oppdatering lagt ut (Anslag)

12. mai 2014

Siste oppdatering sendt inn som oppfylte QC-kriteriene

8. mai 2014

Sist bekreftet

1. mai 2014

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • 11-006065 Aim 4
  • R01DK066483 (U.S. NIH-stipend/kontrakt)

Denne informasjonen ble hentet direkte fra nettstedet clinicaltrials.gov uten noen endringer. Hvis du har noen forespørsler om å endre, fjerne eller oppdatere studiedetaljene dine, vennligst kontakt register@clinicaltrials.gov. Så snart en endring er implementert på clinicaltrials.gov, vil denne også bli oppdatert automatisk på nettstedet vårt. .

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