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Epigenetics and the Origin of Muscle Insulin Resistance in Humans

11. januar 2018 oppdatert av: Lori R. Roust, Mayo Clinic
The investigators are trying to understand the role of DNA (deoxyribonucleic acid) methylation in insulin resistance in skeletal muscle and blood tissues. DNA methylation is a normal chemical process in the body that modifies DNA. By studying this, the investigators hope to better understand the causes of insulin resistance.

Studieoversikt

Detaljert beskrivelse

Insulin resistance is defined as the decreased ability of insulin to perform its biological function in the muscle, liver and fat. Genetic and environmental factors are known to influence insulin sensitivity. It is not known how this is mediated. This study looks at the role of epigenetics (modifications of proteins associated with DNA and methylation of DNA) in alterations in insulin resistance. We will study lean healthy people, obese non-diabetic people and people with type 2 diabetes to characterize the DNA methylation patterns in muscle in each group. The second aim of the study is to see how a single bout of exercise affects the DNA methylation in the muscle. The third aim looks at the effect of 8 weeks of supervised exercise on the DNA methylation.

Studietype

Observasjonsmessig

Registrering (Faktiske)

46

Kontakter og plasseringer

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

Studiesteder

    • 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

Nei

Kjønn som er kvalifisert for studier

Alle

Prøvetakingsmetode

Ikke-sannsynlighetsprøve

Studiepopulasjon

Three groups of volunteers will be studied: 1) lean, healthy volunteers, 2)obese volunteers without type 2 diabetes, and 3) volunteers with type 2 diabetes.

Beskrivelse

Volunteers must be:

  • 21 - 55 years old
  • must be non-lactating, non-pregnant
  • not taking medications known to affect glucose or if taking them, on stable doses.
  • free of significant heart or lung disease

Studieplan

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

Hvordan er studiet utformet?

Designdetaljer

  • Observasjonsmodeller: Kohort
  • Tidsperspektiver: Potensielle

Kohorter og intervensjoner

Gruppe / Kohort
Insulin resistance epigenetics

This experiment will use the Infinium methylation assay to perform epigenome mapping and define patterns of DNA methylation in skeletal muscle and whole blood tissue of metabolically well-characterized lean healthy, obese nondiabetic, and type 2 diabetic volunteers. We will test the hypotheses that

(1) There is an increased methylation of genes involved in mitochondrial biogenesis and oxidative phosphorylation and altered methylation of promoters of genes coding for extracellular matrix and cytoskeletal proteins in insulin resistance, (2) The altered methylation patterns observed correspond to protein and mRNA expression changes, and (3) There are coordinated patterns of DNA methylation between the skeletal muscle and whole blood tissues in insulin resistance.

Single bout of exercise

This experiment will test the hypotheses in lean healthy, obese non-diabetic and type 2 diabetic volunteers that

  1. Increased methylation of the PGC-1α promoter predicts a decreased response of this gene to a single bout of exercise, and
  2. Altered methylation of promoters of nuclear encoded mitochondrial genes predicts a decreased response of this gene to a single bout of exercise.
Eight weeks of exercise

This experiment will test the hypothesis in lean healthy, obese non-diabetic and type 2 diabetic volunteers that

  1. There is decreased methylation of genes involved in mitochondrial biogenesis and oxidative phosphorylation, and the altered methylation corresponds to protein and mRNA (messenger ribonucleic acid) expression changes,
  2. There is altered methylation of genes involved in inflammation and cytoskeletal structure.

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
DNA methylation of genes in insulin resistance
Tidsramme: Baseline to visit 33 (approx 2 months)
DNA methylation of genes involved in mitochondrial biogenesis, oxidative phosphorylation, extracellular matrix and cytoskeleton proteins in insulin resistance, with an acute episode of exercise, and with eight weeks of training exercise.
Baseline to visit 33 (approx 2 months)

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
mRNA expression of genes
Tidsramme: Baseline to visit 33 approx 2 months
mRNA expression of genes involved in mitochondrial biogenesis, oxidative phosphorylation, extracellular matrix and cytoskeletal signaling are altered in insulin resistance, with an acute episode of exercise and with 8 weeks of exercise training.
Baseline to visit 33 approx 2 months

Samarbeidspartnere og etterforskere

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

Sponsor

Etterforskere

  • Hovedetterforsker: Lori Roust, MD, Mayo Clinic
  • Hovedetterforsker: Dawn K Coletta, Ph.D., Mayo Clinic

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. august 2012

Primær fullføring (Faktiske)

21. november 2016

Studiet fullført (Faktiske)

21. november 2016

Datoer for studieregistrering

Først innsendt

8. november 2012

Først innsendt som oppfylte QC-kriteriene

9. november 2012

Først lagt ut (Anslag)

15. november 2012

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

16. januar 2018

Siste oppdatering sendt inn som oppfylte QC-kriteriene

11. januar 2018

Sist bekreftet

1. januar 2018

Mer informasjon

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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