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Role of interleukin-6 levels in cardiovascular autonomic dysfunction in type 2 diabetic patients

Tetsuji Shinohara1, Naohiko Takahashi, Kunio Yufu

  • 1Department of Internal Medicine 1, Faculty of Medicine, Oita University, 1-1 Idaigaoka, Hasama-machi, Yuhu, Oita, Japan. shinohar@med.oita-u.ac.jp

European Journal of Nuclear Medicine and Molecular Imaging
|May 2, 2008
PubMed

Insights

Elevated interleukin-6 (IL-6) levels in type 2 diabetes patients correlate with impaired cardiovascular autonomic function. This suggests a link between inflammation, autonomic dysfunction, and obesity in diabetes management.

Area of Science:

  • Endocrinology
  • Cardiology
  • Immunology

Background:

  • Interleukin-6 (IL-6) is linked to cardiovascular disease risk.
  • Cardiovascular autonomic dysfunction is a significant mortality factor in type 2 diabetes.
  • The specific relationship between IL-6 and cardiovascular autonomic dysfunction in type 2 diabetes remains unclear.

Purpose of the Study:

  • To investigate the association between serum IL-6 levels and cardiovascular autonomic dysfunction in type 2 diabetic patients.

Main Methods:

  • Eighty type 2 diabetic patients were divided into high IL-6 (>2.5 pg/ml) and non-high IL-6 (<2.5 pg/ml) groups.
  • Cardiac autonomic function was evaluated using baroreflex sensitivity, heart rate variability, plasma norepinephrine, and (123)I-metaiodobenzylguanidine (MIBG) scintigraphy.

Main Results:

  • The high IL-6 group exhibited higher body mass index (BMI), fasting insulin, and homeostasis model assessment index.
  • (123)I-MIBG myocardial uptake was reduced, and washout rate was increased in the high IL-6 group.
  • Multiple regression identified BMI and delayed myocardial (123)I-MIBG uptake as independent predictors of IL-6 levels.

Conclusions:

  • Elevated IL-6 levels are associated with impaired cardiovascular autonomic function in type 2 diabetic patients.
  • Obesity is linked to higher IL-6 levels and autonomic dysfunction in this population.
  • These findings highlight the role of inflammation and obesity in diabetic cardiovascular complications.
Abstract

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