目的利用C57BL/6和W/W^v突变小鼠研究Cajal间质细胞(interstitial cells of Cajal,ICC)对小鼠胃肠各部位平滑肌条运动的影响,并通过胆碱能受体拮抗剂阿托品和钠通道阻断剂河豚毒素(tetrodotoxin,TTX)给药干预初步探讨氢溴酸槟榔碱(areco...目的利用C57BL/6和W/W^v突变小鼠研究Cajal间质细胞(interstitial cells of Cajal,ICC)对小鼠胃肠各部位平滑肌条运动的影响,并通过胆碱能受体拮抗剂阿托品和钠通道阻断剂河豚毒素(tetrodotoxin,TTX)给药干预初步探讨氢溴酸槟榔碱(arecoline hydrobromide,Ah)促进小鼠平滑肌条动力作用的机制。方法制备C57BL/6和W/W^v突变小鼠胃肠各部位(胃体、胃窦、空肠和结肠)平滑肌环形肌条标本,分别观察和记录2种小鼠离体胃肠各部位平滑肌条的运动,比较2种小鼠胃肠各部位肌条收缩情况(收缩振幅、收缩频率和张力),并观察Ah对2种小鼠胃肠各部位肌条收缩的影响及阿托品、TTX对Ah促动力作用的干预。结果C57BL/6小鼠胃体部平滑肌环形肌条的收缩为具有较高振幅储存食物和低频率少量推进性的收缩波形,胃窦部为高振幅高张力较高频率推进性的收缩波形,空肠部为低振幅高频率快速推进性的收缩波形,结肠部为分散性中等振幅和频率的收缩波形;W/W^v突变小鼠胃体部环形肌条的收缩频率、收缩振幅都在较低水平,张力较其他部位偏高,胃窦部收缩频率、收缩振幅和张力都在较高水平,空肠部的收缩频率仍是最高,收缩振幅和张力却最低,结肠部的收缩频率最低,收缩振幅和张力处于中等水平;C57BL/6小鼠各部位肌条的收缩力均远大于W/W^v突变小鼠(P<0.05,P<0.01,P<0.001);Ah能明显增加C57BL/6小鼠各部位肌条的收缩力(P<0.05,P<0.01,P<0.001),对W/W^v突变小鼠各部位肌条的收缩力只有轻微增加(P<0.05,P<0.001);阿托品能抑制Ah的促动力作用,而TTX并不能阻断。结论ICCs在调控小鼠胃肠平滑肌条运动中具有重要作用,氢溴酸槟榔碱的促动力作用机制除了ICCs网络的调控外,还有一部分神经调控。另外,氢溴酸槟榔碱可能是经M型受体起作用的。展开更多
BACKGROUND Interdigestive migrating motor complexes(MMC)produce periodic contractions in the gastrointestinal tract,but the exact mechanism of action still remains unclear.Intramuscular interstitial cells of Cajal(ICC...BACKGROUND Interdigestive migrating motor complexes(MMC)produce periodic contractions in the gastrointestinal tract,but the exact mechanism of action still remains unclear.Intramuscular interstitial cells of Cajal(ICC-IM)participate in gastrointestinal hormone and neuromodulation,but the correlation between ICCIM and MMC is also unclear.We found that xiangbinfang granules(XBF)mediated the phase III contraction of MMC.Here,the effects of XBF on gastric antrum motility in W/Wv mice and the effects of ICC-IM on gastric antrum MMC are reported.AIM To observe the effects of ICC-IM on gastric antrum motility and to establish the mechanism of XBF in promoting gastric antrum motility.METHODS The density of c-kit-positive ICC myenteric plexus(ICC-MP)and ICC-IM in the antral muscularis of W/Wv and wild-type(WT)mice was examined by confocal microscopy.The effects of XBF on gastric antrum slow waves in W/Wv and WT mice were recorded by intracellular amplification recording.Micro-strain-gauge force transducers were implanted into the gastric antrum to monitor the MMC and the effect of XBF on gastric antrum motility in conscious W/Wv and WT mice.RESULTS In the gastric antrum of W/Wv mice,c-kit immunoreactivity was significantly reduced,and no ICC-IM network was observed.Spontaneous rhythmic slow waves also appeared in the antrum of W/Wv mice,but the amplitude of the antrum slow wave decreased significantly in W/Wv mice(22.62±2.23 mV vs 2.92±0.52 mV,P<0.0001).MMCs were found in 7 of the 8 WT mice but no complete MMC cycle was found in W/Wv mice.The contractile frequency and amplitude index of the gastric antrum were significantly increased in conscious WT compared to W/Wv mice(frequency,3.53±0.18 cpm vs 1.28±0.12 cpm;amplitude index,23014.26±1798.65 mV·20 min vs 3782.16±407.13 mV·20 min;P<0.0001).XBF depolarized smooth muscle cells of the gastric antrum in WT and W/Wv mice in a dose-dependent manner.Similarly,the gastric antrum motility in WT mice was significantly increased after treatment with XBF 5 mg(P<0.05).Atropine(0.1 mg/kg)blocked the enhancement of XBF in WT and W/Wv mice completely,while tetrodotoxin(0.05 mg/kg)partially inhibited the enhancement by XBF.CONCLUSION ICC-IM participates in the regulation of gastric antrum MMC in mice.XBF induces MMC III-like contractions that enhance gastric antrum motility via ICCIM in mice.展开更多
文摘目的利用C57BL/6和W/W^v突变小鼠研究Cajal间质细胞(interstitial cells of Cajal,ICC)对小鼠胃肠各部位平滑肌条运动的影响,并通过胆碱能受体拮抗剂阿托品和钠通道阻断剂河豚毒素(tetrodotoxin,TTX)给药干预初步探讨氢溴酸槟榔碱(arecoline hydrobromide,Ah)促进小鼠平滑肌条动力作用的机制。方法制备C57BL/6和W/W^v突变小鼠胃肠各部位(胃体、胃窦、空肠和结肠)平滑肌环形肌条标本,分别观察和记录2种小鼠离体胃肠各部位平滑肌条的运动,比较2种小鼠胃肠各部位肌条收缩情况(收缩振幅、收缩频率和张力),并观察Ah对2种小鼠胃肠各部位肌条收缩的影响及阿托品、TTX对Ah促动力作用的干预。结果C57BL/6小鼠胃体部平滑肌环形肌条的收缩为具有较高振幅储存食物和低频率少量推进性的收缩波形,胃窦部为高振幅高张力较高频率推进性的收缩波形,空肠部为低振幅高频率快速推进性的收缩波形,结肠部为分散性中等振幅和频率的收缩波形;W/W^v突变小鼠胃体部环形肌条的收缩频率、收缩振幅都在较低水平,张力较其他部位偏高,胃窦部收缩频率、收缩振幅和张力都在较高水平,空肠部的收缩频率仍是最高,收缩振幅和张力却最低,结肠部的收缩频率最低,收缩振幅和张力处于中等水平;C57BL/6小鼠各部位肌条的收缩力均远大于W/W^v突变小鼠(P<0.05,P<0.01,P<0.001);Ah能明显增加C57BL/6小鼠各部位肌条的收缩力(P<0.05,P<0.01,P<0.001),对W/W^v突变小鼠各部位肌条的收缩力只有轻微增加(P<0.05,P<0.001);阿托品能抑制Ah的促动力作用,而TTX并不能阻断。结论ICCs在调控小鼠胃肠平滑肌条运动中具有重要作用,氢溴酸槟榔碱的促动力作用机制除了ICCs网络的调控外,还有一部分神经调控。另外,氢溴酸槟榔碱可能是经M型受体起作用的。
文摘BACKGROUND Interdigestive migrating motor complexes(MMC)produce periodic contractions in the gastrointestinal tract,but the exact mechanism of action still remains unclear.Intramuscular interstitial cells of Cajal(ICC-IM)participate in gastrointestinal hormone and neuromodulation,but the correlation between ICCIM and MMC is also unclear.We found that xiangbinfang granules(XBF)mediated the phase III contraction of MMC.Here,the effects of XBF on gastric antrum motility in W/Wv mice and the effects of ICC-IM on gastric antrum MMC are reported.AIM To observe the effects of ICC-IM on gastric antrum motility and to establish the mechanism of XBF in promoting gastric antrum motility.METHODS The density of c-kit-positive ICC myenteric plexus(ICC-MP)and ICC-IM in the antral muscularis of W/Wv and wild-type(WT)mice was examined by confocal microscopy.The effects of XBF on gastric antrum slow waves in W/Wv and WT mice were recorded by intracellular amplification recording.Micro-strain-gauge force transducers were implanted into the gastric antrum to monitor the MMC and the effect of XBF on gastric antrum motility in conscious W/Wv and WT mice.RESULTS In the gastric antrum of W/Wv mice,c-kit immunoreactivity was significantly reduced,and no ICC-IM network was observed.Spontaneous rhythmic slow waves also appeared in the antrum of W/Wv mice,but the amplitude of the antrum slow wave decreased significantly in W/Wv mice(22.62±2.23 mV vs 2.92±0.52 mV,P<0.0001).MMCs were found in 7 of the 8 WT mice but no complete MMC cycle was found in W/Wv mice.The contractile frequency and amplitude index of the gastric antrum were significantly increased in conscious WT compared to W/Wv mice(frequency,3.53±0.18 cpm vs 1.28±0.12 cpm;amplitude index,23014.26±1798.65 mV·20 min vs 3782.16±407.13 mV·20 min;P<0.0001).XBF depolarized smooth muscle cells of the gastric antrum in WT and W/Wv mice in a dose-dependent manner.Similarly,the gastric antrum motility in WT mice was significantly increased after treatment with XBF 5 mg(P<0.05).Atropine(0.1 mg/kg)blocked the enhancement of XBF in WT and W/Wv mice completely,while tetrodotoxin(0.05 mg/kg)partially inhibited the enhancement by XBF.CONCLUSION ICC-IM participates in the regulation of gastric antrum MMC in mice.XBF induces MMC III-like contractions that enhance gastric antrum motility via ICCIM in mice.
