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Effect of Age and Weight Loss on Inflammation and Iron Homeostasis (HEP)

12. november 2015 oppdatert av: Simin Meydani, Tufts University

Effect of Age and Weight Loss on Obesity-related Inflammation and Iron Homeostasis in Women

The purpose of this study is to evaluate the effect of aging and weight loss on iron status and immune response in obese women. Iron deficiency and immune impairment are two of the numerous complications of obesity. The central hypothesis is that obesity-induced inflammation causes lower iron status through decreased iron absorption and availability in young and older obese women. Furthermore, the investigators hypothesize that this can be corrected with weight loss in both young and older obese women.

Studieoversikt

Status

Fullført

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

Obese individuals have chronic inflammation, higher risk of iron deficiency, and impaired immune response. These are conditions seen also with aging, but it is unknown to what extent they may be further impacted by obesity in the elderly. With this study the investigators aim to establish the mechanism by which weight loss may reduce inflammation and enhance iron status in young and older obese adults through the peptide hormone hepcidin, which regulates iron homeostasis. The investigators also aim to identify a possible link between iron homeostasis and immune response through hepcidin, which has been implicated in T cell mediated immunity. The investigators hypothesize that obesity-induced inflammation causes dysregulation of hepcidin expression leading to lower iron status through decreased iron absorption and availability in young and older adults. Furthermore, the investigators hypothesize that hepcidin dysregulation, and thus iron status can be mitigated with weight loss in both young and older obese adults. This hypothesis will be tested in obese young and older women undergoing weight loss through calorie restriction. Change in iron status, inflammation, and hepcidin will be determined before and after weight loss. Further, the impact of inflammatory environment of obesity on peripheral blood mononuclear cell hepcidin, ferroportin, intracellular iron, and T cell function in young and older adults will be determined. This study will address two important public health problems, i.e. obesity and iron deficiency and will be an important step toward the identification of strategies to enhance health of obese young and older adults.

Studietype

Intervensjonell

Registrering (Faktiske)

44

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
    • Massachusetts
      • Boston, Massachusetts, Forente stater, 02111
        • JM USDA Human Nutrition Research Center on Aging

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

18 år og eldre (Voksen, Eldre voksen)

Tar imot friske frivillige

Ja

Kjønn som er kvalifisert for studier

Hunn

Beskrivelse

Inclusion Criteria:

  • Enrolling patients in the Weight and Wellness Center (WWC) at Tufts Medical Center, part of their Tufts Employees, low calorie diet (LCD) or pre-surgical low calorie diet (PS-LCD) program, or enrolling at WWC as individual patients.
  • BMI in the range of 30 to 55 kg/m2.
  • Either ages 18-45 or >60.

Exclusion Criteria:

  • Pregnancy.
  • Weight reduction greater than or equal to 3% in the past 3 months.
  • Prior gastric restrictive surgery.
  • Weight loss medications within the 4 weeks prior to screening.
  • History of eating disorder.
  • Renal disease (serum creatinine >2mg/dl).
  • Hepatic disease, except for nonalcoholic steatohepatitis (NASH).
  • Celiac disease, or any kind of intestinal malabsorption disorders.
  • Gastrointestinal cancer.
  • Hereditary hemochromatosis, or any blood disorders.
  • Chronic infectious or inflammatory disease.
  • Use of immunosuppressants.
  • Severe iron deficiency anemia (hemoglobin<8 g/dl) or other conditions that would prevent them from discontinuing iron supplement use.
  • Unwilling to discontinue iron supplement intake. The dietary plan recommended by the WWC will include daily intake of iron that meets the iron RDA for the subject's gender and age group, therefore discontinuing iron supplement will not be harmful for the participants. Intake of other supplements will not be an exclusion criteria, as long as it stays constant throughout the study period.

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
Aktiv komparator: Young (18-45 years)
Obese young women (18-45y) undergoing calorie restriction.
Annen: Calorie Restriction
Intervention consists of a calorically restricted diet regime designed and administered at the Weight and Wellness Center at Tufts University
Eksperimentell: Older (>60 years)
Obese older women (>60y) undergoing calorie restriction.
Annen: Calorie Restriction
Intervention consists of a calorically restricted diet regime designed and administered at the Weight and Wellness Center at Tufts University

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Change in serum hepcidin
Tidsramme: Baseline and 12-16 weeks
The investigators will determine the change in hepcidin at baseline and after 12-16 weeks of calorie restriction.
Baseline and 12-16 weeks
Change in inflammation (CRP, IL-6)
Tidsramme: Baseline and 12-16 weeks
The investigators will determine the change in inflammation at baseline and after 12-16 weeks of calorie restriction.
Baseline and 12-16 weeks
Change in iron status
Tidsramme: Baseline and 12-16 weeks
The investigators will determine the change in iron status at baseline and after 12-16 weeks of calorie restriction.
Baseline and 12-16 weeks

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Change in PBMC intracellular iron content
Tidsramme: Baseline and 12-16 weeks
Baseline and 12-16 weeks
Change in PBMC Hepcidin expression
Tidsramme: Baseline and 12-16 weeks
Baseline and 12-16 weeks
Change in PBMC ferroportin expression
Tidsramme: Baseline and 12-16 weeks
Baseline and 12-16 weeks
Change in PBMC subpopulations and proliferation
Tidsramme: Baseline and 12-16 weeks
After stimulation with ConA, PHA and anti-CD3/CD28
Baseline and 12-16 weeks

Samarbeidspartnere og etterforskere

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Sponsor

Tufts University

Etterforskere

  • Hovedetterforsker: Simin N Meydani, DVM, PhD, Tufts University

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. mars 2011

Primær fullføring (Faktiske)

1. november 2013

Studiet fullført (Faktiske)

1. november 2013

Datoer for studieregistrering

Først innsendt

26. januar 2012

Først innsendt som oppfylte QC-kriteriene

5. juli 2012

Først lagt ut (Anslag)

10. juli 2012

Oppdateringer av studieposter

Sist oppdatering lagt ut (Anslag)

16. november 2015

Siste oppdatering sendt inn som oppfylte QC-kriteriene

12. november 2015

Sist bekreftet

1. november 2015

Mer informasjon

Begreper knyttet til denne studien

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • 2765

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