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Horm Metab Res 2009; 41(7): 568-572
DOI: 10.1055/s-0029-1202864
Humans, Clinical

© Georg Thieme Verlag KG Stuttgart · New York

Short-term Acute Hyperinsulinemia and Prothrombotic Factors in Subjects with Normal Glucose Tolerance

E. Muscelli 1 , S. Camastra 1 , E. Santini 1 , A. Casolaro 1 , S. Pinnola 1 , B. D. Astiarraga 1 , A. Solini 1
  • 1Department of Internal Medicine, University of Pisa, Pisa, Italy
Further Information

Publication History

received 25.08.2008

accepted 13.01.2009

Publication Date:
25 March 2009 (online)

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Abstract

Some cytokines and proinflammatory mediators are considered markers of increased atherothrombotic risk. Few information is available on the effects of acute glucose and insulin variations on these markers of atherosclerosis. We assessed the acute effect of glucose and insulin on soluble CD40 ligand (sCD40L), IL-6, and P-selectin levels, evaluating their relationship with insulin sensitivity in normal glucose tolerance subjects (NGT). Twenty-four NGT subjects underwent a 3-h oral glucose tolerance test (OGTT) with measurements of sCD40L, IL-6, and P-selectin levels at 0, 90 and 180 min. Insulin sensitivity was assessed by the Oral Glucose Sensitivity Index (OGIS). To distinguish the role of glucose and insulin, eight subjects had the plasma glucose profile of the OGTT reproduced by a variable IV glucose infusion (ISO-G study) and nine underwent a euglycemic clamp. Lastly, a 3-h time-control (TC) study was performed in eleven subjects. A significant reduction of sCD40L was observed during OGTT and ISO-G study. This reduction was not due to time-related changes, since it was not observed in TC study. During the clamp, insulin induced a marked drop in sCD40L (from 4.89±1.34 to 1.60±0.29 ng/ml, p<0.05). In the pooled data from all studies, fasting sCD40L was indirectly related to LDL-cholesterol (r=−0.38; p=0.04), while IL-6 was directly related with BMI, fat mass, waist circumference, and P-selectin (p<0.05). sCD40L levels are downregulated during a short-term period of acute hyperinsulinemia, whether induced by oral or intravenous glucose administration or by insulin infusion, while it does not seem to affect P-selectin and IL-6.

Key words

insulin - sCD40L - IL-6 - P-selectin - OGTT

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Correspondence

E. MuscelliMD 

Department of Internal Medicine

University of Pisa

Via Roma 67

56100 Pisa

Italy

Phone: +39/050/99 35 31

Fax: +39/050/55 32 35

Email: muscelli@ifc.cnr.it

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