Impact of exercise and angiotensin converting enzyme inhibition on tumor necrosis factor-alpha and leptin in fructose-fed hypertensive rats

Hypertens Res. 2002 Nov;25(6):919-26. doi: 10.1291/hypres.25.919.

Abstract

The aim of this study was to evaluate the effects of moderate-intensity regular exercise and/or an angiotensin converting enzyme (ACE) inhibition on tumor necrosis factor-alpha (TNF-alpha) and glucose and lipid metabolism parameters. Spontaneously hypertensive rats (SHRs) were fed a fructose-rich diet during 16 weeks of either exercise training (Ex group: 20 m/min, 0% grade, 60 min/day, 5 days/week), administration of an ACE inhibitor (TM group: temocapril, 10 mg/kg/day), or a combination of both (TM+Ex group). The systolic blood pressure was reduced exclusively in the TM and TM+Ex group. Epididymal fat pads (EPI) weighed less in the TM+Ex group than in the single-treatment (TM) group. The serum leptin level was significantly and directly correlated with the EPI weight (p < 0.001). The TNF-alpha content per gram of EPI was the highest in the TM+Ex group. In addition, the EPI TNF-alpha level was negatively correlated with both the EPI weight and the serum leptin level (p < 0.001, respectively). In contrast, the TNF-alpha level of skeletal muscles was identical among the groups. The extensor digitorum longus had a significantly higher abundance of TNF-alpha protein than the soleus muscle. These data indicate that the local TNF-alpha expression is tissue-specific, and that upregulation of TNF-alpha in EPI by exercise training and/or ACE inhibition may have contributed to the reduction in fat cell volume via the induction of apoptosis and/or the regulation of metabolic homeostasis.

MeSH terms

  • Adipose Tissue / metabolism
  • Adipose Tissue / pathology
  • Angiotensin-Converting Enzyme Inhibitors / pharmacology*
  • Animals
  • Blood Pressure
  • Diet
  • Epididymis
  • Fructose / administration & dosage*
  • Hindlimb
  • Hypertension / blood*
  • Hypertension / pathology
  • Leptin / blood*
  • Male
  • Motor Activity / physiology*
  • Muscle, Skeletal / metabolism
  • Myocardium / pathology
  • Organ Size / drug effects
  • Rats
  • Rats, Inbred SHR
  • Systole
  • Thiazepines / pharmacology*
  • Tumor Necrosis Factor-alpha / metabolism*
  • Up-Regulation

Substances

  • Angiotensin-Converting Enzyme Inhibitors
  • Leptin
  • Thiazepines
  • Tumor Necrosis Factor-alpha
  • Fructose
  • temocapril hydrochloride