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Association of Multiple Biomarkers of Iron Metabolism and Type 2 Diabetes: The EPIC-InterAct Study.


ABSTRACT: OBJECTIVE:Observational studies show an association between ferritin and type 2 diabetes (T2D), suggesting a role of high iron stores in T2D development. However, ferritin is influenced by factors other than iron stores, which is less the case for other biomarkers of iron metabolism. We investigated associations of ferritin, transferrin saturation (TSAT), serum iron, and transferrin with T2D incidence to clarify the role of iron in the pathogenesis of T2D. RESEARCH DESIGN AND METHODS:The European Prospective Investigation into Cancer and Nutrition-InterAct study includes 12,403 incident T2D cases and a representative subcohort of 16,154 individuals from a European cohort with 3.99 million person-years of follow-up. We studied the prospective association of ferritin, TSAT, serum iron, and transferrin with incident T2D in 11,052 cases and a random subcohort of 15,182 individuals and assessed whether these associations differed by subgroups of the population. RESULTS:Higher levels of ferritin and transferrin were associated with a higher risk of T2D (hazard ratio [HR] [95% CI] in men and women, respectively: 1.07 [1.01-1.12] and 1.12 [1.05-1.19] per 100 ?g/L higher ferritin level; 1.11 [1.00-1.24] and 1.22 [1.12-1.33] per 0.5 g/L higher transferrin level) after adjustment for age, center, BMI, physical activity, smoking status, education, hs-CRP, alanine aminotransferase, and ?-glutamyl transferase. Elevated TSAT (?45% vs. <45%) was associated with a lower risk of T2D in women (0.68 [0.54-0.86]) but was not statistically significantly associated in men (0.90 [0.75-1.08]). Serum iron was not associated with T2D. The association of ferritin with T2D was stronger among leaner individuals (Pinteraction < 0.01). CONCLUSIONS:The pattern of association of TSAT and transferrin with T2D suggests that the underlying relationship between iron stores and T2D is more complex than the simple link suggested by the association of ferritin with T2D.

SUBMITTER: Podmore C 

PROVIDER: S-EPMC5058436 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature

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Association of Multiple Biomarkers of Iron Metabolism and Type 2 Diabetes: The EPIC-InterAct Study.

Podmore Clara C   Meidtner Karina K   Schulze Matthias B MB   Scott Robert A RA   Ramond Anna A   Butterworth Adam S AS   Di Angelantonio Emanuele E   Danesh John J   Arriola Larraitz L   Barricarte Aurelio A   Boeing Heiner H   Clavel-Chapelon Françoise F   Cross Amanda J AJ   Dahm Christina C CC   Fagherazzi Guy G   Franks Paul W PW   Gavrila Diana D   Grioni Sara S   Gunter Marc J MJ   Gusto Gaelle G   Jakszyn Paula P   Katzke Verena V   Key Timothy J TJ   Kühn Tilman T   Mattiello Amalia A   Nilsson Peter M PM   Olsen Anja A   Overvad Kim K   Palli Domenico D   Quirós J Ramón JR   Rolandsson Olov O   Sacerdote Carlotta C   Sánchez-Cantalejo Emilio E   Slimani Nadia N   Sluijs Ivonne I   Spijkerman Annemieke M W AM   Tjonneland Anne A   Tumino Rosario R   van der A Daphne L DL   van der Schouw Yvonne T YT   Feskens Edith J M EJ   Forouhi Nita G NG   Sharp Stephen J SJ   Riboli Elio E   Langenberg Claudia C   Wareham Nicholas J NJ  

Diabetes care 20160209 4


<h4>Objective</h4>Observational studies show an association between ferritin and type 2 diabetes (T2D), suggesting a role of high iron stores in T2D development. However, ferritin is influenced by factors other than iron stores, which is less the case for other biomarkers of iron metabolism. We investigated associations of ferritin, transferrin saturation (TSAT), serum iron, and transferrin with T2D incidence to clarify the role of iron in the pathogenesis of T2D.<h4>Research design and methods<  ...[more]

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