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The peach tree,  Prunus persica  (L.) Batsch, is widely cultivated in China, and its flowers have been used for centuries in traditional Chinese medicine to treat gut motility disorders. But few studies have explored the pharmacological effect of  Prunus persica  (L.) Batsch flowers on gastrointestinal motility. In this study, the activities of different extracts from  Prunus persica  (L.) Batsch flowers on the smooth muscle contractions were evaluated using isolated colon model, and the ethyl acetate extract (EAE) showed the strongest effects in vitro. EAE (10 −8 –10 −5  g/mL) caused a concentration-dependent stimulatory effect in rat colonic tissue. Additionally, ketotifen (100  µ M), cimetidine (10  µ M), and pyrilamine (1  µ M) produced a significant inhibition of contractions caused by EAE. Furthermore, immunofluorescence and toluidine blue staining revealed increased numbers of mast cells in the EAE group, and EAE increased histamine release from the colonic tissues. These data indicate that EAE has significant prokinetic activity and acts by a mechanism that mainly involves mast cell degranulation. Our study provides a pharmacological basis for the use of an extract of  Prunus persica  (L.) Batsch flowers in the treatment of gut motility disorders.

Prokinetic Activity ofPrunus persica(L.) Batsch Flowers Extract and Its Possible Mechanism of Action in Rats