Journal List > J Nutr Health > v.51(5) > 1106746

J Nutr Health. 2018 Oct;51(5):369-378. Korean.
Published online October 31, 2018.  https://doi.org/10.4163/jnh.2018.51.5.369
© 2018 The Korean Nutrition Society
Alteration in plasma chemokine profile in a high-fat diet-induced obesity mouse model
Dong-Hwan Kim,1,** Jeong Min Cho,2,** Min Joon Seo,3,4 Ju Hyun Lim,4 and Hae-Rahn Bae1,4
1Human Life Research Center, Dong-A University, Busan 49315, Korea.
2Department of Plastic Surgery, College of Medicine, Dong-A University, Busan 49201, Korea.
3Department of Emergency Medicine, College of Medicine, Dong-A University, Busan 49201, Korea.
4Department of Physiology, College of Medicine, Dong-A University, Busan 49201, Korea.

To whom correspondence should be addressed. tel: +82-51-240-2924, Email: hrbae@dau.ac.kr

**These authors contributed equally to this article.

Received August 31, 2018; Revised September 14, 2018; Accepted October 08, 2018.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


Abstract

Purpose

Obesity is associated with a dysregulation of metabolic balance and is regarded as a low grade chronic inflammation. Western-style diet and physical inactivity are leading causes of obesity. This study examined the profiles of forty plasma cytokines and chemokines at the same time in the early stages of high-fat diet-induced obesity using a mouse model.

Methods

A total of 30 male CD1 mice, 12 ~ 14 weeks of age, were enrolled. The mice were fed a high-fat diet for 6 weeks to induce obesity. The plasma glucose and triglyceride concentrations were measured using a hexokinase colorimetric assay kit and a serum triglyceride determination kit, respectively. The relative levels of multiple cytokines and chemokines in the plasma were determined using a mouse cytokine array kit.

Results

The mice exhibited significant weight gain after 6 weeks of a high-fat diet. The genital fat depot was enlarged along with an increase in the number and the mean size of white adipocytes as early as 4 weeks after a high-fat diet. In addition, the plasma glucose and triglyceride levels increased significantly after 4 weeks of a high-fat diet. Cytokine array analysis revealed a remarkable increase in the expression of both CXCL12 and CXCL13, whereas the proinflammatory cytokines remained low after 4 weeks of a high-fat diet.

Conclusion

A significant increase in plasma levels of CXCL12 and CXCL13 was observed after 4 weeks of a high-fat diet, which might induce the migration of B lymphocytes, T lymphocytes, and monocytes from the blood to expanding adipose tissue or fat associated lymphoid clusters, playing a key role in adipose tissue remodeling and local immunity during the early stages of high-fat diet-induced obesity.

Keywords: high-fat diet; obesity; CXCL12; CXCL13; mouse

Figures


Fig. 1
Changes in body weights and food intake after a high-fat diet. The body weights (A) and the amount of food intake (B) of CD1 mice were measured for 6 weeks of normal (Control) or a high-fat diet (HFD). Note the significant weight gain after 6 weeks of a high-fat diet with no change in food intake (mean ± SE, * p < 0.05).
Click for larger image


Fig. 2
Changes in organ weights after a high-fat diet. Heart (A), liver (B) and hamstring muscle (C) of CD1 mice were extracted after 4 weeks (HF-4W) and 6 weeks (HF-6W) of normal (CON) or a high-fat diet and weighed. Note that the weight of liver increased while that of hamstring muscle decreased after 6 week high-fat diet (mean ± SE, * p < 0.05).
Click for larger image


Fig. 3
Changes in adipose tissue mass after a high-fat diet. Genital (A), inguinal (B) and interscapular adipose tissues (C) of CD1 mice were extracted after 4 weeks (HF-4W) and 6 weeks (HF-6W) of normal (CON) or a high-fat diet and weighed. Note that weights of genital fat depots increased while those of interscapular fat depots decreased after 6 week high-fat diet (mean ± SE, * p < 0.05).
Click for larger image


Fig. 4
Histological analysis of adipose tissues after a high-fat diet. Genital, inguinal and interscapular adipose tissues of CD1 mice were paraffin sectioned and stained with hematoxylin and eosin after 4 weeks (HF-4W) and 6 weeks (HF-6W) of normal (CON) or a high-fat diet. Note that the number and the mean size of white adipocytes increased as early as 4 weeks following a high-fat diet.
Click for larger image


Fig. 5
Changes in plasma glucose and triglyceride levels after a high-fat diet. Concentrations of plasma glucose (A) and triglyceride (B) were measured after 4 weeks (HF-4W) and 6 weeks (HF-6W) of a high-fat diet or normal diet (CON). Note that the plasma glucose and triglyceride levels significantly increased after 4 weeks of a high-fat diet (mean ± SE, * p < 0.05, ** p < 0.01).
Click for larger image


Fig. 6
Representative blots of mouse plasma cytokine array after a high-fat diet. Plasma cytokine and chemokine profiles were assessed using a mouse cytokine array kit after 4 weeks of normal (CON) or a high-fat diet (HF-4W). The dots exhibiting stronger density in HF-4W than CON are boxed in red, whereas those exhibiting weaker density in HF-4W than CON are boxed in blue. The dots with gray boxes correspond to those showing similar densities between the two groups. Note that CXCL12 and CXCL13 spots remarkably increased after 4 weeks of a high-fat diet. Representative blots from 3 individual experiments.
Click for larger image

Notes

This work was supported by the Dong-A University research fund.

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