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The association of inflammatory and fibrinolytic proteins with 5 year change in insulin clearance: the Insulin Resistance Atherosclerosis Study (IRAS).

Abstract：

AIMS/HYPOTHESIS:Insulin clearance may decline as an early mechanism compensating for deteriorating insulin sensitivity. However, no previous studies have investigated the association between subclinical inflammation or impaired fibrinolysis and insulin clearance. We examined the association between plasminogen activator inhibitor (PAI)-1, C-reactive protein (CRP), TNF-α, leptin and fibrinogen and the progression of metabolic clearance rate of insulin (MCRI) over time. METHODS:We studied 784 non-diabetic white, Hispanic and African-American individuals in the Insulin Resistance Atherosclerosis Study (IRAS). Insulin sensitivity, acute insulin response and MCRI were determined from frequently sampled intravenous glucose tolerance tests at baseline and at 5-year follow-up. Inflammatory and fibrinolytic proteins were measured in fasting plasma at baseline. RESULTS:MCRI had declined significantly by 29% at the 5-year follow-up. We observed a significant association between higher plasma PAI-1 levels and the decline in MCRI in multivariable-adjusted regression models (β = -0.045 [95% CI -0.081, -0.0091]). Higher plasma CRP and leptin levels were associated with a decline in MCRI in unadjusted models, but these associations were non-significant after adjusting for BMI and waist circumference (β = -0.016 [95% CI -0.041, 0.0083] for CRP; β = -0.044 [95% CI -0.10, 0.011] for leptin). A higher plasma TNF-α concentration was associated with a decline in MCRI in unadjusted (β = -0.071 [95% CI -0.14, -0.00087]) but not in multivariable-adjusted (β = -0.056 [95% CI -0.13, 0.017]) models. Plasma fibrinogen level was not associated with the change in MCRI. CONCLUSIONS/INTERPRETATION:We identified that higher plasma PAI-1 (but not CRP, TNF-α, leptin or fibrinogen) levels independently predicted the progressive decline of insulin clearance in the multiethnic cohort of the IRAS.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Lee CC,Lorenzo C,Haffner SM,Wagenknecht LE,Festa A,Goodarzi MO,Stefanovski D,Olson NC,Norris JM,Rewers MJ,Hanley AJ

doi

10.1007/s00125-012-2741-8

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

112-20

issue

eissn

0012-186X

issn

1432-0428

journal_volume

pub_type

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The association of inflammatory and fibrinolytic proteins with 5 year change in insulin clearance: the Insulin Resistance Atherosclerosis Study (IRAS).