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Fitoterapia. 2014 Jul;96:25-32. doi: 10.1016/j.fitote.2014.04.002. Epub 2014 Apr 13.

The laxative effect of emodin is attributable to increased aquaporin 3 expression in the colon of mice and HT-29 cells.

Author information

1
Fujian University of Traditional Chinese Medicine, No. 1, Huatuo Road, Minhoushangjie, Fuzhou 350122, China.
2
Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, No. 16, Nanxiaojie, Dongzhimennei, Beijing 100700, China.
3
Fujian University of Traditional Chinese Medicine, No. 1, Huatuo Road, Minhoushangjie, Fuzhou 350122, China; Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, No. 16, Nanxiaojie, Dongzhimennei, Beijing 100700, China.
4
Fujian University of Traditional Chinese Medicine, No. 1, Huatuo Road, Minhoushangjie, Fuzhou 350122, China; Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, No. 16, Nanxiaojie, Dongzhimennei, Beijing 100700, China. Electronic address: linna888@163.com.

Abstract

Emodin (1,3,8-trihydroxy-6-methylanthraquinone) is a stimulant laxative and used to treat constipation. Aquaporin 3 (AQP3) plays an important role in regulating water transfer in the colon. In the study, we investigated whether the laxative effect of emodin is associated with the regulation of AQP3 in the colon. Our results showed that treatment with emodin increased the fecal water content in the colon of mice and evaluation index of defecation in a dose-dependent manner. More interestingly, emodin significantly increased the AQP3 protein and mRNA expression both in the colon of mice and in human intestinal epithelial cells (HT-29). Mechanistically, emodin obviously up-regulated the cyclic adenosine monophosphate (cAMP)-dependent protein kinase A catalytic subunits α (PKA C-α) and phosphorylated cAMP response element-binding protein (p-CREB Ser133) expression in HT-29 cells. These results suggest that the laxative effect of emodin is associated with the increased expression of AQP3 by up-regulating PKA/p-CREB signal pathway.

KEYWORDS:

Aquaporin 3; Colon; Emodin; Laxative

PMID:
24727085
DOI:
10.1016/j.fitote.2014.04.002
[Indexed for MEDLINE]

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