Nutrition Research and Practice

The Korean Nutrition Society (한국영양학회)
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Expression of eotaxin in 3T3-L1 adipocytes and the effects of weight loss in high-fat diet induced obese mice

  • Kim, Hyun-Jung (School of Life Science, Hondong Global University) ;
  • Kim, Chang-Hyun (School of Life Science, Hondong Global University) ;
  • Lee, Do-Hyun (School of Life Science, Hondong Global University) ;
  • Han, Min-Woo (School of Life Science, Hondong Global University) ;
  • Kim, Mi-Young (School of Life Science, Hondong Global University) ;
  • Ju, Jae-Hyun (School of Life Science, Hondong Global University) ;
  • Do, Myoung-Sool (School of Life Science, Hondong Global University)
  • Received : 2010.10.04
  • Accepted : 2010.12.21
  • Published : 2011.02.28
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Abstract

Eotaxin is an important inflammatory chemokine in eosinophil chemotaxis and activation and, thus, is implicated in asthma. Recently, obesity was associated with an increased prevalence of asthma, but the relationship between obesity and eotaxin expression has only been partially understood in obese mice and human studies. Therefore, we studied the expression patterns of eotaxin in 3T3-L1 preadipocytes/adipocytes to determine whether eotaxin levels are influenced by body weight gain and/or reduction in diet-induced obese mice. First, we investigated eotaxin expression during differentiation in 3T3-L1 adipocytes. Then, we treated 3T3-L1 preadipoeytes/adipoeytes with tumor necrosis factor-alpha (TNF-${\alpha}$), eotaxin, interleukin (IL)-4, IL-5, or leptin. To examine the effects of weight loss in high-fat diet induced obese mice, we fed C57BL/6 mice a high-fat diet or a normal diet for 26 weeks. Then, half of the high-fat diet group were fed a normal diet until 30 weeks to reduce weight. Epididymal adipose tissue, visceral adipose tissue, serum, and bronchoalveolar fluid of mice were examined for eotaxin expression. The results showed that eotaxin expression levels increased with adipocyte differentiation and that more eotaxin was expressed when the cells were stimulated with TNF-${\alpha}$, eotaxin, IL-4, IL-5, or leptin. An in vivo study showed that eotaxin levels were reduced in visceral adipose tissues when high-fat diet fed mice underwent weight loss. Taken together, these results indicate a close relationship between eotaxin expression and obesity as well as weight loss, thus, they indirectly show a relation to asthma.

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References

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