OBJECTIVE To investigate the mechanisms of Xiaobanxia Tang(XBXT)in the prevention and treatment of chemotherapy-induced nausea and vomiting.METHODS The chemotherapy-induced rat pica model was established by intraperit...OBJECTIVE To investigate the mechanisms of Xiaobanxia Tang(XBXT)in the prevention and treatment of chemotherapy-induced nausea and vomiting.METHODS The chemotherapy-induced rat pica model was established by intraperitoneal injection of cisplatin 6mg·kg-1.Kaolin consumption was used as an indicator of nausea and vomiting.Wistar male rats were randomly divided into normal control,XBXT normal control,model,ondansetron treating,XBXT decoction high and low dose groups.The rats in ondansetron group,XBXT normal control group,XBXT high and low dose groups were gavaged ondansetron 2.6mg·kg-1·d-1,XBXT 1.6,3.2and 1.6g·kg-1·d-1,respectively 1hbefore cisplatin injection,and the administration were given every 12 h.Kaolin consumptions were weighed every 12 h.After 24 hand 72hof cisplatin injection,animals were sacrificed respectively.The contents of 5-HT,5-HIAA,dopamine(DA),DOPAC,substance P(SP),TPH,MAO and TH were measured by ELISA.The mRNA expression of 5-HT transporter(SERT),5-HT3 Areceptor,SP precursor(PPTA),NK1 and D2receptors in rat ileum and medulla oblongata were measured by RT-PCR,the protein expression were measured by Western blotting.RESULTS The high and low dosages of XBXT could significantly inhibit kaolin consumptions in cisplatin-treated rats,and reduce5-HT,increase 5-HIAA contents and reduce 5-HT3 Areceptor mRNA and protein expression,above effects are related to the reduction of TPH and the enhancement of MAOA levels.The two dosages of XBXT could significantly reduce SP and NK1 mRNA and protein expression,which was related to the reduction of PPTA mRNA expression.XBXT could also significantly reduce DA contents and D2 receptor mRNA and protein expression,which was related to the reduction of TH.CONCLUSION XBXT has significant antiemetic effect in chemotherapy-induced nausea and vomiting,the underlying mechanisms are related to the inhibition of 5-HT and5-HT3 Areceptor,SP and NK1 receptor,DA and D2 receptor.展开更多
AIM: To investigate whether 5-hydroxytryptamine(serotonin; 5-HT) is involved in mediating abnormal motor activity in dogs after cisplatin administration.METHODS: After the dogs had been given a 2-wk recovery period, a...AIM: To investigate whether 5-hydroxytryptamine(serotonin; 5-HT) is involved in mediating abnormal motor activity in dogs after cisplatin administration.METHODS: After the dogs had been given a 2-wk recovery period, all of them were administered cisplatin, and the motor activity was recorded using strain gauge force transducers. Blood and intestinal fluid samples were collected to measure 5-HT for 24 h. To determine whether 5-HT in plasma or that in intestinal fluids is more closely related to abnormal motor activity we injected 5-HT into the bloodstream and the intestinal tract of the dogs.RESULTS: Cisplatin given intravenously produced abnormal motor activity that lasted up to 5 h. From 3 to 4 h after cisplatin administration, normal intact dogs exhibited retropropagation of motor activity accompanied by emesis. The concentration of 5-HT in plasma reached the peak at 4 h, and that in intestinal fluids reached the peak at 3 h. In normal intact dogs with resection of the vagus nerve that were administered kytril, cisplatin given intravenously did not produce abnormal motor activity. Intestinal serotonin administration did not produce abnormal motor activity, but intravenous serotonin administration did.CONCLUSION: After the intravenous administration of cisplatin, abnormal motor activity was produced in the involved vagus nerve and in the involved serotonergic neurons via another pathway. This study was the first to determine the relationship between 5-HT and emesis-induced motor activity.展开更多
Objective:To investigate the pharmacological potential of Argemone mexicana in treating constipation and emesis by using in vitro and in vivo models.Methods:The spasmogenic and spasmolytic effects were evaluated on is...Objective:To investigate the pharmacological potential of Argemone mexicana in treating constipation and emesis by using in vitro and in vivo models.Methods:The spasmogenic and spasmolytic effects were evaluated on isolated rabbit jejunum fragments loaded in a tissue organ bath.The response was recorded with an isotonic transducer attached with Power Lab Data Acquisition System.The laxative and antiemetic activities were assessed in BALB-c mice and poultry chicks challenged with carbamylcholine and copper sulphate stimulated emesis,respectively.Results:The total phenolic and total flavonoids contents of the extract were(267.75±5.77)mg GAE/g and(73.86±6.01)mg QE/g,respectively.Argemone mexicana extract exerted spasmogenic effect on isolated rabbit jejunum segments with an EC_(50)value of 0.016 mg/m L,which was blocked by atropine(0.3μM).Argemone mexicana extract exerted spasmolytic effect in atropine treated jejunum fragments with an EC_(50)value of 2.185 mg/mL.Furthermore,Argemone mexicana extract relaxed potassium(80 mM)-induced contractions(EC_(50):9.07 mg/mL),similar to a standard drug verapamil.The calcium channel blocker activity was confirmed by a rightward shift of concentration-response curve of calcium in the presence of Argemone mexicana extract(1-5 mg/mL)and verapamil(0.1-1μM).In addition,the extract increased the distance travelled by a charcoal in the gastrointestinal tract and exhibited antiemetic effect on copper sulphate induced emesis in chicks.Conclusions:Argemone mexicana shows cholinergic agonist and calcium channel blocker activities,as well as antiemetic effect.It may be used as a potential agent for treating gastrointestinal disorders.展开更多
基金The project supported by National Natural Science Foundation of China(81373828)
文摘OBJECTIVE To investigate the mechanisms of Xiaobanxia Tang(XBXT)in the prevention and treatment of chemotherapy-induced nausea and vomiting.METHODS The chemotherapy-induced rat pica model was established by intraperitoneal injection of cisplatin 6mg·kg-1.Kaolin consumption was used as an indicator of nausea and vomiting.Wistar male rats were randomly divided into normal control,XBXT normal control,model,ondansetron treating,XBXT decoction high and low dose groups.The rats in ondansetron group,XBXT normal control group,XBXT high and low dose groups were gavaged ondansetron 2.6mg·kg-1·d-1,XBXT 1.6,3.2and 1.6g·kg-1·d-1,respectively 1hbefore cisplatin injection,and the administration were given every 12 h.Kaolin consumptions were weighed every 12 h.After 24 hand 72hof cisplatin injection,animals were sacrificed respectively.The contents of 5-HT,5-HIAA,dopamine(DA),DOPAC,substance P(SP),TPH,MAO and TH were measured by ELISA.The mRNA expression of 5-HT transporter(SERT),5-HT3 Areceptor,SP precursor(PPTA),NK1 and D2receptors in rat ileum and medulla oblongata were measured by RT-PCR,the protein expression were measured by Western blotting.RESULTS The high and low dosages of XBXT could significantly inhibit kaolin consumptions in cisplatin-treated rats,and reduce5-HT,increase 5-HIAA contents and reduce 5-HT3 Areceptor mRNA and protein expression,above effects are related to the reduction of TPH and the enhancement of MAOA levels.The two dosages of XBXT could significantly reduce SP and NK1 mRNA and protein expression,which was related to the reduction of PPTA mRNA expression.XBXT could also significantly reduce DA contents and D2 receptor mRNA and protein expression,which was related to the reduction of TH.CONCLUSION XBXT has significant antiemetic effect in chemotherapy-induced nausea and vomiting,the underlying mechanisms are related to the inhibition of 5-HT and5-HT3 Areceptor,SP and NK1 receptor,DA and D2 receptor.
文摘AIM: To investigate whether 5-hydroxytryptamine(serotonin; 5-HT) is involved in mediating abnormal motor activity in dogs after cisplatin administration.METHODS: After the dogs had been given a 2-wk recovery period, all of them were administered cisplatin, and the motor activity was recorded using strain gauge force transducers. Blood and intestinal fluid samples were collected to measure 5-HT for 24 h. To determine whether 5-HT in plasma or that in intestinal fluids is more closely related to abnormal motor activity we injected 5-HT into the bloodstream and the intestinal tract of the dogs.RESULTS: Cisplatin given intravenously produced abnormal motor activity that lasted up to 5 h. From 3 to 4 h after cisplatin administration, normal intact dogs exhibited retropropagation of motor activity accompanied by emesis. The concentration of 5-HT in plasma reached the peak at 4 h, and that in intestinal fluids reached the peak at 3 h. In normal intact dogs with resection of the vagus nerve that were administered kytril, cisplatin given intravenously did not produce abnormal motor activity. Intestinal serotonin administration did not produce abnormal motor activity, but intravenous serotonin administration did.CONCLUSION: After the intravenous administration of cisplatin, abnormal motor activity was produced in the involved vagus nerve and in the involved serotonergic neurons via another pathway. This study was the first to determine the relationship between 5-HT and emesis-induced motor activity.
文摘Objective:To investigate the pharmacological potential of Argemone mexicana in treating constipation and emesis by using in vitro and in vivo models.Methods:The spasmogenic and spasmolytic effects were evaluated on isolated rabbit jejunum fragments loaded in a tissue organ bath.The response was recorded with an isotonic transducer attached with Power Lab Data Acquisition System.The laxative and antiemetic activities were assessed in BALB-c mice and poultry chicks challenged with carbamylcholine and copper sulphate stimulated emesis,respectively.Results:The total phenolic and total flavonoids contents of the extract were(267.75±5.77)mg GAE/g and(73.86±6.01)mg QE/g,respectively.Argemone mexicana extract exerted spasmogenic effect on isolated rabbit jejunum segments with an EC_(50)value of 0.016 mg/m L,which was blocked by atropine(0.3μM).Argemone mexicana extract exerted spasmolytic effect in atropine treated jejunum fragments with an EC_(50)value of 2.185 mg/mL.Furthermore,Argemone mexicana extract relaxed potassium(80 mM)-induced contractions(EC_(50):9.07 mg/mL),similar to a standard drug verapamil.The calcium channel blocker activity was confirmed by a rightward shift of concentration-response curve of calcium in the presence of Argemone mexicana extract(1-5 mg/mL)and verapamil(0.1-1μM).In addition,the extract increased the distance travelled by a charcoal in the gastrointestinal tract and exhibited antiemetic effect on copper sulphate induced emesis in chicks.Conclusions:Argemone mexicana shows cholinergic agonist and calcium channel blocker activities,as well as antiemetic effect.It may be used as a potential agent for treating gastrointestinal disorders.
