Obesity Is a Major Determinant of the Association of C-Reactive Protein Levels and the Metabolic Syndrome in Type 2 Diabetes

  1. Steven E. Kahn1,
  2. Bernard Zinman2,
  3. Steven M. Haffner3,
  4. M. Colleen O’Neill4,
  5. Barbara G. Kravitz4,
  6. Dahong Yu4,
  7. Martin I. Freed4,
  8. William H. Herman5,
  9. Rury R. Holman6,
  10. Nigel P. Jones4,
  11. John M. Lachin7,
  12. Giancarlo C. Viberti8 and
  13. the ADOPT Study Group*
  1. 1Division of Metabolism, Endocrinology and Nutrition, Department of Internal Medicine, VA Puget Sound Health Care System and University of Washington, Seattle, Washington
  2. 2Samuel Lunenfeld Research Institute, Mount Sinai Hospital and University of Toronto, Ontario, Canada
  3. 3University of Texas Health Science Center at San Antonio, San Antonio, Texas
  4. 4GlaxoSmithKline, King of Prussia, Pennsylvania
  5. 5Departments of Internal Medicine and Epidemiology, University of Michigan, Ann Arbor, Michigan
  6. 6Diabetes Trials Unit, Oxford Centre for Diabetes, Endocrinology and Metabolism, Oxford, U.K
  7. 7Biostatistics Center, George Washington University, Rockville, Maryland
  8. 8King’s College London School of Medicine, King’s College London, London, U.K
  1. Address correspondence and reprint requests to Steven E. Kahn, MB, ChB, VA Puget Sound Health Care System (151), 1660 S. Columbian Way, Seattle, WA 98108. E-mail: skahn{at}u.washington.edu

Abstract

The inflammatory factor C-reactive protein (CRP) and the fibrinolytic variables fibrinogen and plasminogen activator-1 (PAI-1) are associated with long-term cardiovascular morbidity. To determine the contribution of body adiposity (BMI), insulin sensitivity (homeostasis model assessment of insulin resistance [HOMA-IR], and glycemia (HbA1c [A1C]) to the levels of these inflammatory and fibrinolytic variables in recently diagnosed (≤3 years), drug-naive, type 2 diabetic subjects (fasting plasma glucose ≤10 mmol/l), we examined a representative subgroup (n = 921) of the U.S. cohort in ADOPT (A Diabetes Outcome Progression Trial). The relationship between levels of CRP, fibrinogen, PAI-1 antigen and PAI-1 activity, and baseline variables including National Cholesterol Education Program Adult Treatment Panel III metabolic syndrome phenotype were explored. All four factors increased significantly with increasing numbers of metabolic syndrome components (P = 0.0136 to P < 0.0001). BMI (P < 0.0001) and HOMA-IR (P < 0.0001) but not A1C (P = 0.65) increased with increasing numbers of metabolic syndrome components. Adjustment of CRP levels for BMI eliminated the association between CRP and the number of metabolic syndrome components, while adjusting for HOMA-IR did not (P = 0.0028). The relationships of PAI-1 antigen and PAI-1 activity with the number of metabolic syndrome components were maintained after adjusting for BMI (P = 0.0002 and P = <0.0001, respectively) or HOMA-IR (P = 0.0008 and P = <0.0001, respectively), whereas that with fibrinogen was eliminated after adjusting for BMI but not after adjusting for HOMA-IR (P = 0.013). Adjustment for A1C had no effect on any of the relationships between the inflammatory and fibrinolytic factors and the metabolic syndrome. We conclude that in recently diagnosed, drug-naive type 2 diabetic subjects, markers of inflammation and fibrinolysis are strongly related to the number of metabolic syndrome components. Further, for CRP and fibrinogen this relationship is determined by body adiposity and not by insulin sensitivity or glucose control.

Footnotes

  • *

    * A list of members of the ADOPT Study Group appears in Diabetes 53:3193–3200, 2004

    S.E.K., B.Z., S.M.H., W.H.H., R.R.H., J.M.L., and G.C.V. have received honoraria, consulting fees, and/or grant/research support from GlaxoSmithKline.

    ADOPT, A Diabetes Outcome Progression Trial; CRP, C-reactive protein; CVD, cardiovascular disease; HOMA-IR, homeostasis model assessment of insulin resistance; PAI-1, plasminogen activator-1.

    The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked “advertisement” in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

    • Accepted May 22, 2006.
    • Received January 25, 2006.
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  1. doi: 10.2337/db06-0116 Diabetes August 2006 vol. 55 no. 8 2357-2364
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