当前位置： SCI文献检索 > JOURNAL OF ETHNOPHARMACOLOGY期刊下所有文献 > Salvia miltiorrhiza causes tonic contraction in rat ileum through Ca²⁺-calmodulin pathway.

Salvia miltiorrhiza causes tonic contraction in rat ileum through Ca²⁺-calmodulin pathway.

Abstract：

ETHNOPHARMACOLOGICAL RELEVANCE:Danshen, root of Salvia miltiorrhiza (SM), has been traditionally used in Chinese medicine for the treatment of heart, abdomen, gurgling in the intestines, and relieving fullness. However, the effects of SM on intestine have rarely been done to date. AIM OF THE STUDY:To investigate the contraction effect of SM on isolated rat ileum and its mechanisms involved. MATERIALS AND METHODS:The isometric contractions of ileum segments were investigated in organ baths for spontaneous activity and response to ethanolic extracts of SM. To determine the contraction mechanism caused by SM extracts, atropine (a muscarinic receptor antagonist), tetrodotoxin (TTX, a sodium channel blocker), nifedipine (a calcium channel blocker), Ca(2+) free Krebs solution with EGTA, or trifluoperazine (TFP, a calmodulin blocker) was administered and its response to cumulative dosages of SM extracts were examined. The effect of SM extracts on Ca(2+) signaling in the intestinal epithelial cell-6 (IEC-6) was examined using fura-2 as a Ca(2+) indicator. RESULTS:SM extracts caused dose-dependent tonic contraction on rat ileum in ex vivo organ bath studies. The contraction induced by SM extracts was not inhibited by atropine, TTX, nifedipine, or in Ca(2+) free solution. However, the ileal contractions induced by SM extracts were significantly inhibited by TFP in a dose-dependent manner. In IEC-6 cells, the SM extracts induced extracellular Ca(2+) entry and massive intracellular Ca(2+) release in Ca(2+)-contained medium, and induced intracellular Ca(2+) release in Ca(2+)-free medium. CONCLUSION:These results demonstrate that SM extracts cause ileal contraction through the Ca(2+)-calmodulin pathway.

journal_name

J Ethnopharmacol

journal_title

Journal of ethnopharmacology

authors

Tsai CC,Huang SC,Liu JK,Wang HC,Tsai TR,Tsai PJ,Liu CW,Chang LC

doi

10.1016/j.jep.2012.05.041

subject

Has Abstract

pub_date

2012-08-01 00:00:00

pages

694-9

issue

3

eissn

0378-8741

issn

1872-7573

pii

S0378-8741(12)00363-7

journal_volume

142

pub_type

杂志文章

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