Activation of muscarinic M-1 cholinoceptors by curcumin to increase contractility in urinary bladder isolated from Wistar rats

作者：Cheng Tse Chou; Lu Chih Cheng; Chung Hsien Hui; Hsu Chih Chieh; Kakizawa Nozomi; Yamada Shizuo; Cheng Juei Tang^*

来源：Neuroscience Letters, 2010, 473(2): 107-109.

DOI：10.1016/j.neulet.2010.02.029

• Curcumin
• Muscarinic M-1 cholinoceptors
• Radioligand binding
• Uninary bladder
• Wistar rat

Curcumin is an active principle contained in rhizome of Curcuma longa, and it has been recently mentioned to show affinity to muscarinic M-1 cholinoceptors (M(1)-mAChR). In the present study, we found that curcumin caused a concentration-dependent increase of muscle tone in urinary bladder isolated from Wistar rats. This action was inhibited by pirenzepine at concentration enough to block M(1)-mAChR. In radioligand-binding assay, specific binding of [(3)H]-oxotremorine (OXO-M) in the rat bladder homogenates was also displaced by curcumin in a concentration-dependent manner. In the presence of inhibitors for PLC-PKC pathway, either U73122 (phospholipase C inhibitor) or chelerythrine (protein kinase C inhibitor), curcumin-stimulated contraction in urinary bladder was markedly reduced. In conclusion, the obtained results suggest that curcumin can activate M(1)-mAChR at concentrations lower than to scavenge free radicals to increase of muscle tone in urinary bladder through PLC-PKC pathway.

• 出版日期2010-4-5