Exp Clin Endocrinol Diabetes 2017; 125(01): 12-20
DOI: 10.1055/s-0042-118175
Article
© Georg Thieme Verlag KG Stuttgart · New York

Serum Ferritin, Insulin Resistance, and β-cell Dysfunction: A Prospective Study in Normoglycemic Japanese Men

Koshi Nakamura
1   Department of Public Health, Hokkaido University Graduate School of Medicine, Sapporo, Japan
,
Masaru Sakurai
3   Department of Social and Environmental Medicine, Kanazawa Medical University, Uchinada, Japan
,
Yuko Morikawa
4   School of Nursing, Kanazawa Medical University, Uchinada, Japan
,
Shin-ya Nagasawa
2   Department of Epidemiology and Public Health, Kanazawa Medical University, Uchinada, Japan
,
Katsuyuki Miura
5   Department of Public Health, and Center for Epidemiologic Research in Asia, Shiga University of Medical Science, Otsu, Japan
,
Masao Ishizaki
3   Department of Social and Environmental Medicine, Kanazawa Medical University, Uchinada, Japan
,
Teruhiko Kido
6   School of Health Sciences, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
,
Yuchi Naruse
7   Department of Social Walfare, Toyama College of Welfare Science, Imizu, Japan
,
Motoko Nakashima
4   School of Nursing, Kanazawa Medical University, Uchinada, Japan
,
Kazuhiro Nogawa
8   Department of Occupational and Environmental Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
,
Yasushi Suwazono
8   Department of Occupational and Environmental Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
,
Hideaki Nakagawa
9   Medical Research Institute, Kanazawa Medical University, Uchinada, Japan
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Weitere Informationen

Publikationsverlauf

received 12. April 2016
revised 12. April 2016

accepted 23. September 2016

Publikationsdatum:
17. Oktober 2016 (online)

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Abstract

Objectives: The present cohort study investigated the relationship between serum ferritin levels and indices of insulin resistance and β-cell dysfunction in a normoglycemic population without iron overload disorders.

Methods: The study participants included 575 normoglycemic Japanese men aged 35–57 years with serum ferritin levels of 400 μg/L or less. Insulin resistance and β-cell dysfunction were estimated at baseline and after 3 years by the homeostasis model assessments of insulin resistance and β-cell function (HOMA-IR and HOMA-β, respectively). To compare the subsequent changes in HOMA-IR and HOMA-β over a 3-year follow-up period among 3 groups based on tertiles of baseline serum ferritin levels (4.9–87.1, 87.2–140.5, and 140.6–396.8 μg/L), the geometric mean HOMA-IR and HOMA-β values at year 3 were calculated for each group using analysis of covariance, incorporating the respective log-transformed parameters at baseline in addition to age, body mass index and major confounding factors.

Results: The multivariate-adjusted geometric mean HOMA-IR at year 3 was significantly higher in those in the highest and middle serum ferritin tertiles (1.24 and 1.22, respectively), compared with the lowest tertile (1.07) (p=0.009). When the total study participants were stratified by median body mass index (22.72 kg/m2), similar positive relationships were observed between serum ferritin levels and HOMA-IR for both obese and non-obese participants. However, the adjusted geometric mean HOMA-β at year 3 was similar among the 3 serum ferritin groups.

Conclusions: Elevated serum ferritin levels predicted a subsequent increase in HOMA-IR in normoglycemic Japanese men without iron overload disorders.