Spicatoside A in red Liriope platyphylla displays a laxative effect in a constipation rat model via regulating mAChRs and ER stress signaling

Kim,Ji   Eun; Go,Jun; Lee,Hee   Seob; Hong,Jin   Tae; Hwang,Dae   Youn

doi:10.3892/ijmm.2018.3960

Spicatoside A in red Liriope platyphylla displays a laxative effect in a constipation rat model via regulating mAChRs and ER stress signaling

Authors:
- Ji Eun Kim
- Jun Go
- Hee Seob Lee
- Jin Tae Hong
- Dae Youn Hwang
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Affiliations: Department of Biomaterials Science, College of Natural Resources and Life Science/Life and Industry Convergence Research Institute, Pusan National University, Miryang 627‑706, Republic of Korea, Department of Food Science and Nutrition, College of Human Ecology, Pusan National University, Busan 609‑735, Republic of Korea, College of Pharmacy, Chungbok National University, Chungju 361‑763, Republic of Korea
Published online on: October 29, 2018 https://doi.org/10.3892/ijmm.2018.3960
Pages: 185-198
Copyright: © Kim et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Red Liriope platyphylla extract (EtRLP) has been used as an oriental medicine for treatment of several chronic conditions, such as neurodegenerative disorders, diabetes, and obesity. To investigate the laxative activity of EtRLP, the levels of key constipation markers and their molecular regulators were examined following administration of EtRLP in constipation Sprague Dawley (SD) rats treated with loperamide (Lop). Compared with the Lop+Vehicle‑treated group, the excretion levels of urine and stool were significantly enhanced in the Lop+EtRLP‑treated group, even though feeding levels were kept constant. There was a significant improvement in histological structure, cytological ultrastructure and mucin secretion in transverse colon sections from the Lop+EtRLP‑treated group, compared with the Lop+Vehicle‑treated group. The Lop+EtRLP‑treated group exhibited a rapid recovery of the muscarinic acetylcholine receptor (mAChR) signaling pathway and of the endoplasmic reticulum (ER) stress response, compared with Lop+Vehicle‑treated group. Spicatoside A, one of the key components detected in EtRLP, recovered the levels of inositol triphosphate (IP3) and Gα in primary rat intestinal smooth muscle cells (pRISMCs). Taken together, the present results indicated that spicatoside A‑containing EtRLP had therapeutic effects against Lop‑induced constipation in SD rats via improvement of the mAChR downstream signaling pathway and the ER stress response.

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