Aqueous extract of Liriope platyphylla, a traditional Chinese medicine, significantly inhibits abdominal fat accumulation and improves glucose regulation in OLETF type II diabetes model rats.
10.5625/lar.2012.28.3.181
- Author:
Ji Eun KIM
1
;
In Sik HWANG
;
Sun Il CHOI
;
Hye Ryun LEE
;
Young Ju LEE
;
Jun Seo GOO
;
Hee Seob LEE
;
Hong Ju SON
;
Min Ju JANG
;
Sang Hak LEE
;
Byeong Cheol KANG
;
Dae Youn HWANG
Author Information
1. College of Natural Resources & Life Science, Pusan National University, Miryang, Korea. dyhwang@pusan.ac.kr
- Publication Type:Original Article
- Keywords:
Liriope platyphylla;
insulin;
diabetes;
glucose transporter;
signaling pathway
- MeSH:
Abdominal Fat;
Adiponectin;
Animals;
China;
Cough;
Glucose;
Glucose Transport Proteins, Facilitative;
Insulin;
Korea;
Liver;
Medicine, Chinese Traditional;
Neurodegenerative Diseases;
Obesity;
Phosphorylation;
Phosphotransferases;
Protein Kinases;
Rats;
Rats, Inbred OLETF;
Sputum
- From:Laboratory Animal Research
2012;28(3):181-191
- CountryRepublic of Korea
- Language:English
-
Abstract:
Liriope platyphylla is a medical herb that has long been used in Korea and China to treat cough, sputum, neurodegenerative disorders, obesity, and diabetes. The aims of this study were to determine the antidiabetic and antiobesity effects of aqueous extract of L. platyphylla (AEtLP) through glucose and lipid regulation in both pre-diabetes and obesity stage of type II diabetes model. Two concentrations of AEtLP were orally administrated to OLETF (Otsuka Long-Evans Tokushima Fatty) rats once a day for 2 weeks, after which changes in glucose metabolism and fat accumulation were measured. Abdominal fat mass dramatically decreased in AEtLP-treated OLETF rats, whereas glucose concentration slightly decreased in all AEtLP-treated rats. However, compared to vehicle-treated OLETF rats, only AEtLP10 (10% concentration)-treated OLETF rats displayed significant induction of insulin production, whereas AEtLP5 (5% concentration)-treated OLETF rats showed a lower level of insulin. Although serum adiponectin level increased in only AEtLP5-treated rats, significant alteration of lipid concentration was detected in AEtLP5-treated OLETF rats. Expression of Glut-1 decreased in all AEtLP-treated rats, whereas Akt phosphorylation increased only in AEtLP10-treated OLETF rats. Furthermore, the pattern of Glut-3 expression was very similar with that of Glut-1 expression, which roughly corresponded with the phosphorylation of c-Jun N-teminal kinase (JNK) and p38 in the mitogen-activated protein kinase pathway. Therefore, these findings suggest that AEtLP should be considered as a therapeutic candidate during pre-diabetes and obesity stage capable of inducing insulin secretion from pancreatic beta-cells, glucose uptake in liver cells, as well as a decrease in fat and lipid accumulation.
