Hypolipidemic effects of chitosan and its derivatives in hyperlipidemic rats induced by a high-fat diet

Haitao Pan; Qingyun Yang; Guidong Huang; Chen Ding; Peiqiu Cao; Lanlan Huang; Tiancun Xiao; Jiao Guo; Zhengquan Su

doi:10.3402/fnr.v60.31137

Hypolipidemic effects of chitosan and its derivatives in hyperlipidemic rats induced by a high-fat diet

Food Nutr Res. 2016 May 3:60:31137. doi: 10.3402/fnr.v60.31137. eCollection 2016.

Authors

Haitao Pan¹, Qingyun Yang¹, Guidong Huang¹, Chen Ding¹, Peiqiu Cao¹, Lanlan Huang¹, Tiancun Xiao^{2

3}, Jiao Guo⁴, Zhengquan Su⁵

Affiliations

¹ Key Research Center of Liver Regulation for Hyperlipidemia SATCM/Class III Laboratory of Metabolism SATCM, Guangdong TCM Key Laboratory for Metabolic Diseases, Guangdong Pharmaceutical University, Guangzhou, China.
² Inorganic Chemistry Laboratory, Oxford University, Oxford, United Kingdom.
³ Guangzhou Boxabio Ltd, D-106 Guangzhou International Business Incubator, Guangzhou Science City, Guangzhou, China.
⁴ Key Research Center of Liver Regulation for Hyperlipidemia SATCM/Class III Laboratory of Metabolism SATCM, Guangdong TCM Key Laboratory for Metabolic Diseases, Guangdong Pharmaceutical University, Guangzhou, China; wshxalb@163.com.
⁵ Key Research Center of Liver Regulation for Hyperlipidemia SATCM/Class III Laboratory of Metabolism SATCM, Guangdong TCM Key Laboratory for Metabolic Diseases, Guangdong Pharmaceutical University, Guangzhou, China; suzhq@scnu.edu.cn.

Abstract

Background: Hyperlipidemia (HLP) is the primary risk factor of cardiovascular disease (CVD). Various factors, including genetics, physical inactivity, and daily nutritional habits, affect the prevalence of HLP. Recently, it was revealed that dietary fibers, such as pectin, psyllium, and especially chitosan (CTS), may play important roles in hypolipidemic management. Thus, this study aims to determine the hypolipidemic effect and mechanism of CTS and its water-soluble derivatives, chitosan oligosaccharides (MN≤1,000 Da (COSI) and MN≤3,000 Da (COSIII)), in male hyperlipidemic rats induced by a high-fat diet (HFD).

Design: After the model creation, 120 Sprague-Dawley (SD) rats were equally assigned to 12 groups fed various diets as follows: the normal group with basic diet, an HFD group, an HFD group supplemented with three doses of CTS, COSI and COSIII groups, and an HFD group treated with simvastatin (7 mg/kg·d). After 6 weeks, body weight, fat/body ratio, and the relevant biomarkers of serum, liver, and feces were measured. Additionally, the histological analysis of liver and adipose tissue was performed, and the mRNA expressions of liver peroxisome proliferator-activated receptor-α (PPARα) and hepatic lipase (HL) were examined.

Results: Compared with HFD group, rats fed CTS, COSI, and COSIII showed a better ability to regulate their body weight, liver and cardiac indices, fat/body ratio, as well as serum, liver, and fecal lipids, and simultaneously to maintain the appropriate activity of liver and serum superoxide dismutase (SOD), alanine aminotransferase (ALT), aspartate aminotransferase (AST), as well as liver and fecal total bile acids (TBA). Simultaneously, there had been a higher mRNA expression of PPARα and HL in the treatment groups.

Conclusion: The obtained results suggested that these three function foods can effectively improve liver lipid metabolism by normalizing the expressions of PPARα and HL, and protect liver from the oxidized trauma by enhancing hepatic function, which could be potentially used to remedy hyperlipidemia.

Keywords: PPARα; chitosan; chitosan oligosaccharides; high-fat diet; hypolipidemic effect.