Highlights
- •Elevated ferritin was associated with increased type 2 diabetes risk in Chinese.
- •Adjustment for ALT had the strongest impact on the ferritin-diabetes association.
- •There is a significant interaction between hs-CRP and ferritin on diabetes risk.
- •The ferritin-diabetes association was significant among those with HbA1c ≥ 6.5%.
- •The ferritin-diabetes association was not significant in those with HbA1c < 6.5%.
Abstract
Aims
Ferritin is postulated to be involved in diabetogenesis as a marker of iron stores.
We prospectively examined the association between ferritin levels and type 2 diabetes
(T2D) risk in a Chinese population.
Methods
Plasma ferritin concentrations were assayed among 485 diabetes cases and 485 controls
nested within the Singapore Chinese Health Study. Cases and controls were matched
on age, gender, date of blood collection, and dialect group. Participants were free
of diagnosed diabetes, cardiovascular disease, and cancer at blood collection (1999–2004).
Incident self-reported T2D cases were identified at follow-up II interview (2006–2010).
Multivariable conditional logistic regression models were used to compute the odds
ratio (OR) and the corresponding 95% confidence intervals (CIs).
Results
After adjusting for T2D risk factors, including high-sensitivity C-reactive protein
(hs-CRP), adiponectin, triglycerides, HDL cholesterol and alanine aminotransferase,
the OR comparing the highest versus lowest quartile of ferritin levels was 1.87 (95%
CI 1.10–3.19) (P-trend = 0.004). When the analysis was limited to participants with hs-CRP < 1.5 mg/L (below median; n = 482), the OR comparing extreme quartiles of ferritin levels was 1.16 (95% CI 0.62–2.16;
P-trend = 0.63); while the corresponding OR was 2.51 (95% CI 1.31–4.79; P-trend < 0.001) when confined to those with hs-CRP ≥ 1.5 mg/L (n = 488; P-interaction = 0.022). Compared to participants with both ferritin and hs-CRP levels below median,
those with both levels above median had markedly increased T2D risk (P-interaction for multiplicative scale = 0.037).
Conclusions
The elevation of blood ferritin levels, in the presence of raised hs-CRP, was significantly
associated with increased risk of T2D.
Keywords
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Article info
Publication history
Published online: April 13, 2017
Accepted:
April 7,
2017
Received in revised form:
March 31,
2017
Received:
February 17,
2017
Identification
Copyright
© 2017 Elsevier B.V. All rights reserved.
