Antihyperglycemic action of rhodiola-aqeous extract in type1-like diabetic rats

BMC Complementary and Alternative Medicine

Ho-Shan Niu²  Li-Jen Chen¹  Chiang-Shan Niu² 

[1] Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan City 70101, Taiwan;Department of Nursing, Tzu Chi College of Technology, Hualien City 97005, Taiwan

关键词: Rhodiola-water extract;    Plasma glucose;    Opioid μ-receptor;    Hyperglycemia;    Adrenalectomy;   

Others  :  1220341
DOI  :  10.1186/1472-6882-14-20

 received in 2013-09-08, accepted in 2014-01-09,  发布年份 2014

【 摘 要 】

Background

Rhodiola rosea (Rhodiola) is a plant in the Crassulaceae family that grows in cold regions of the world. It is mainly used in clinics as an adaptogen. Recently, it has been mentioned that Rhodiola increases plasma β-endorphin to lower blood pressure. Thus, the present study aims to investigate the antidiabetic action of Rhodiola in relation to opioids in streptozotocin-induced diabetic rats (STZ-diabetic rats).

Methods

In the present study, the plasma glucose was analyzed with glucose oxidase method, and the determination of plasma β-endorphin was carried out using a commercially available enzyme-linked immunosorbent assay. The adrenalectomy of STZ-diabetic rats was used to evaluate the role of β-endorphin. In addition, quantitative reverse transcription-polymerase chain reaction (qRT-PCR) and western blotting analysis were performed to investigate mRNA and protein expressions.

Results

Rhodiola-water extract dose-dependently lowered the plasma glucose in STZ-diabetic rats and this action was reversed by blockade of opioid μ-receptors using cyprodime. An increase of plasma β-endorphin by rhodiola-water extract was also observed in same manner. The plasma glucose lowering action of rhodiola-water extract was attenuated in bilateral adrenalectomized rats. In addition, continuous administration of rhodiola-water extract for 3 days in STZ-diabetic rats resulted in an increased expression of glucose transporter subtype 4 (GLUT 4) in skeletal muscle and a marked reduction of phosphoenolpyruvate carboxykinase (PEPCK) expression in liver. These effects were also reversed by blockade of opioid μ-receptors.

Conclusions

Taken together, rhodiola-water extract improves hyperglycemia via an increase of β-endorphin secretion from adrenal gland to activate opioid μ-receptors in STZ-diabetic rats.

【 授权许可】

   
2014 Niu et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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