We studied the effects of electroacupuncture at Zusanli （ST 36） on neurons in the colonic myenteric plexus and on defecation in rats with irritable bowel syndrome with constipation （IBS-C）. We also used intragastr...We studied the effects of electroacupuncture at Zusanli （ST 36） on neurons in the colonic myenteric plexus and on defecation in rats with irritable bowel syndrome with constipation （IBS-C）. We also used intragastric administration of pinaverium bromide as a positive control treatment to reveal the pathway mediating the onset of IBS-C. Both electroacupuncture and pinaverium bromide greatly improved defecation in rats with IBS-C. Immunohistochemical staining of the enteric nervous system neuronal marker protein gene product 9.5 in the colonic myenteric plexus showed that electroacupuncture by itself, or in combination with pinaverium bromide, increased the number of neurons and the staining intensity of protein gene product 9.5 in the colonic myenteric plexus. We conclude that visceral hypersensitivity is likely to be a primary cause of constipation in IBS-C rats.展开更多
BACKGROUND The mechanisms underlying gastrointestinal(GI)dysmotility with ulcerative colitis(UC)have not been fully elucidated.The enteric nervous system(ENS)plays an essential role in the GI motility.As a vital neuro...BACKGROUND The mechanisms underlying gastrointestinal(GI)dysmotility with ulcerative colitis(UC)have not been fully elucidated.The enteric nervous system(ENS)plays an essential role in the GI motility.As a vital neurotransmitter in the ENS,the gas neurotransmitter nitric oxide(NO)may impact the colonic motility.In this study,dextran sulfate sodium(DSS)-induced UC rat model was used for investigating the effects of NO by examining the effects of rate-limiting enzyme nitric oxide synthase(NOS)changes on the colonic motility as well as the role of the ENS in the colonic motility during UC.AIM To reveal the relationship between the effects of NOS expression changes in NOS-containing nitrergic neurons and the colonic motility in a rat UC model.METHODS Male rats(n=8/each group)were randomly divided into a control(CG),a UC group(EG1),a UC+thrombin derived polypeptide 508 trifluoroacetic acid(TP508TFA;an NOS agonist)group(EG2),and a UC+NG-monomethyl-L-arginine monoacetate(L-NMMA;an NOS inhibitor)group(EG3).UC was induced by administering 5.5%DSS in drinking water without any other treatment(EG1),while the EG2 and EG3 were gavaged with TP508 TFA and L-NMMA,respectively.The disease activity index(DAI)and histological assessment were recorded for each group,whereas the changes in the proportion of colonic nitrergic neurons were counted using immunofluorescence histochemical staining,Western blot,and enzyme linked immunosorbent assay,respectively.In addition,the contractile tension changes in the circular and longitudinal muscles of the rat colon were investigated in vitro using an organ bath system.RESULTS The proportion of NOS-positive neurons within the colonic myenteric plexus(MP),the relative expression of NOS,and the NOS concentration in serum and colonic tissues were significantly elevated in EG1,EG2,and EG3 compared with CG rats.In UC rats,stimulation with agonists and inhibitors led to variable degrees of increase or decrease for each indicator in the EG2 and EG3.When the rats in EGs developed UC,the mean contraction tension of the colonic smooth muscle detected in vitro was higher in the EG1,EG2,and EG3 than in the CG group.Compared with the EG1,the contraction amplitude and mean contraction tension of the circular and longitudinal muscles of the colon in the EG2 and EG3 were enhanced and attenuated,respectively.Thus,during UC,regulation of the expression of NOS within the MP improved the intestinal motility,thereby favoring the recovery of intestinal functions.CONCLUSION In UC rats,an increased number of nitrergic neurons in the colonic MP leads to the attenuation of colonic motor function.To intervene NOS activity might modulate the function of nitrergic neurons in the colonic MP and prevent colonic motor dysfunction.These results might provide clues for a novel approach to alleviate diarrhea symptoms of UC patients.展开更多
目的研究慢传输型便秘结肠肌间神经丛的神经丝蛋白和 S-100蛋白的病理改变,探索结肠动力减弱的原因,为临床治疗提供理论依据.方法采用免疫组织化学方法研究33例结肠慢传输型便秘患者(STC 组)和25例非便秘性结肠(对照组)的升结肠、横结...目的研究慢传输型便秘结肠肌间神经丛的神经丝蛋白和 S-100蛋白的病理改变,探索结肠动力减弱的原因,为临床治疗提供理论依据.方法采用免疫组织化学方法研究33例结肠慢传输型便秘患者(STC 组)和25例非便秘性结肠(对照组)的升结肠、横结肠、降结肠、乙状结肠的肌间神经丛内神经丝蛋白和 S-100蛋白的表达,利用计算机图象分析系统作定量分析,并与病程及年龄作直线相关性分析.所得数据用 t 检验进行统计学处理.结果对照组结肠肌间神经丛内神经丝蛋白和 S-100蛋白的含量在各段之间无显著性差别(0.09±0.03 vs 0.10±0.02,P>0.05),STC 组结肠各段与对照组比较,神经丝蛋白的平均光密度值明显高于对照组(0.12±0.03 vs 0.09±0.02,P<0.01);S-100蛋白的含量及平均光密度值明显高于对照组(0.10±0.04 vs 0.08±0.03,P<0.01).神经丝蛋白和 S-100蛋白的改变随着病程的延长而增加,二者呈直线相关(r=0.75)结论慢传输型便秘结肠肌间神经丛存在着全结肠性退行性病理改变,表现为神经丝蛋白的堆积聚集和神经间质的增生,且随着病程的延长而加重,这是造成结肠动力减弱的主要原因.提示,手术切除结肠的范围应是全结肠或次全结肠.展开更多
基金the State Key Development Program for Basic Research of China, No.2011CB505206 Practice Innovation Development Program of College Students in Higher Education Institutions of Jiangsu Province, No. 00485
文摘We studied the effects of electroacupuncture at Zusanli （ST 36） on neurons in the colonic myenteric plexus and on defecation in rats with irritable bowel syndrome with constipation （IBS-C）. We also used intragastric administration of pinaverium bromide as a positive control treatment to reveal the pathway mediating the onset of IBS-C. Both electroacupuncture and pinaverium bromide greatly improved defecation in rats with IBS-C. Immunohistochemical staining of the enteric nervous system neuronal marker protein gene product 9.5 in the colonic myenteric plexus showed that electroacupuncture by itself, or in combination with pinaverium bromide, increased the number of neurons and the staining intensity of protein gene product 9.5 in the colonic myenteric plexus. We conclude that visceral hypersensitivity is likely to be a primary cause of constipation in IBS-C rats.
基金Supported by National Natural Science Foundation of China,No.31971112Natural Science Foundation of Liaoning Province,No.2021-MS-330Innovation Capability Support Program of Shaanxi,No.2021TD-57.
文摘BACKGROUND The mechanisms underlying gastrointestinal(GI)dysmotility with ulcerative colitis(UC)have not been fully elucidated.The enteric nervous system(ENS)plays an essential role in the GI motility.As a vital neurotransmitter in the ENS,the gas neurotransmitter nitric oxide(NO)may impact the colonic motility.In this study,dextran sulfate sodium(DSS)-induced UC rat model was used for investigating the effects of NO by examining the effects of rate-limiting enzyme nitric oxide synthase(NOS)changes on the colonic motility as well as the role of the ENS in the colonic motility during UC.AIM To reveal the relationship between the effects of NOS expression changes in NOS-containing nitrergic neurons and the colonic motility in a rat UC model.METHODS Male rats(n=8/each group)were randomly divided into a control(CG),a UC group(EG1),a UC+thrombin derived polypeptide 508 trifluoroacetic acid(TP508TFA;an NOS agonist)group(EG2),and a UC+NG-monomethyl-L-arginine monoacetate(L-NMMA;an NOS inhibitor)group(EG3).UC was induced by administering 5.5%DSS in drinking water without any other treatment(EG1),while the EG2 and EG3 were gavaged with TP508 TFA and L-NMMA,respectively.The disease activity index(DAI)and histological assessment were recorded for each group,whereas the changes in the proportion of colonic nitrergic neurons were counted using immunofluorescence histochemical staining,Western blot,and enzyme linked immunosorbent assay,respectively.In addition,the contractile tension changes in the circular and longitudinal muscles of the rat colon were investigated in vitro using an organ bath system.RESULTS The proportion of NOS-positive neurons within the colonic myenteric plexus(MP),the relative expression of NOS,and the NOS concentration in serum and colonic tissues were significantly elevated in EG1,EG2,and EG3 compared with CG rats.In UC rats,stimulation with agonists and inhibitors led to variable degrees of increase or decrease for each indicator in the EG2 and EG3.When the rats in EGs developed UC,the mean contraction tension of the colonic smooth muscle detected in vitro was higher in the EG1,EG2,and EG3 than in the CG group.Compared with the EG1,the contraction amplitude and mean contraction tension of the circular and longitudinal muscles of the colon in the EG2 and EG3 were enhanced and attenuated,respectively.Thus,during UC,regulation of the expression of NOS within the MP improved the intestinal motility,thereby favoring the recovery of intestinal functions.CONCLUSION In UC rats,an increased number of nitrergic neurons in the colonic MP leads to the attenuation of colonic motor function.To intervene NOS activity might modulate the function of nitrergic neurons in the colonic MP and prevent colonic motor dysfunction.These results might provide clues for a novel approach to alleviate diarrhea symptoms of UC patients.
文摘目的研究慢传输型便秘结肠肌间神经丛的神经丝蛋白和 S-100蛋白的病理改变,探索结肠动力减弱的原因,为临床治疗提供理论依据.方法采用免疫组织化学方法研究33例结肠慢传输型便秘患者(STC 组)和25例非便秘性结肠(对照组)的升结肠、横结肠、降结肠、乙状结肠的肌间神经丛内神经丝蛋白和 S-100蛋白的表达,利用计算机图象分析系统作定量分析,并与病程及年龄作直线相关性分析.所得数据用 t 检验进行统计学处理.结果对照组结肠肌间神经丛内神经丝蛋白和 S-100蛋白的含量在各段之间无显著性差别(0.09±0.03 vs 0.10±0.02,P>0.05),STC 组结肠各段与对照组比较,神经丝蛋白的平均光密度值明显高于对照组(0.12±0.03 vs 0.09±0.02,P<0.01);S-100蛋白的含量及平均光密度值明显高于对照组(0.10±0.04 vs 0.08±0.03,P<0.01).神经丝蛋白和 S-100蛋白的改变随着病程的延长而增加,二者呈直线相关(r=0.75)结论慢传输型便秘结肠肌间神经丛存在着全结肠性退行性病理改变,表现为神经丝蛋白的堆积聚集和神经间质的增生,且随着病程的延长而加重,这是造成结肠动力减弱的主要原因.提示,手术切除结肠的范围应是全结肠或次全结肠.
