AIM: Irritable bowel syndrome (IBS) is characterized by abdominal pain and changes in stool habits. Visceral hypersensitivity is a key factor in the pathophysiology of IBS. The aim of this study was to examine the eff...AIM: Irritable bowel syndrome (IBS) is characterized by abdominal pain and changes in stool habits. Visceral hypersensitivity is a key factor in the pathophysiology of IBS. The aim of this study was to examine the effect of rectal balloon-distention stimulus by blood oxygenation leveldependent functional magnetic resonance imaging (BOLDfMRI) in visceral pain center and to compare the distribution,extent, and intensity of activated areas between IBS patients and normal controls.
METHODS: Twenty-six patients with IBS and eleven normal controls were tested for rectal sensation, and the subjective pain intensity at 90 ml and 120 ml rectal balloon-distention was reported by using Visual Analogue Scale. Then, BOLDfMRI was performed at 30 ml, 60 ml, 90 ml, and 120 ml rectal balloon-distention in all subjects.
RESULTS: Rectal distention stimulation increased the activity of anterior cingulate cortex (35/37), insular cortex (37/37),prefrontal cortex (37/37), and thalamus (35/37) in most cases.At 120 ml of rectal balloon-distention, the activation area and percentage change in MR signal intensity of the regions of interest (ROI) at IC, PFC, and THAL were significantly greater in patients with IBS than that in controls. Score of pain sensation at 90 ml and 120 ml rectal balloon-distention was significantly higher in patients with IBS than that in controls.
CONCLUSION: Using fMRI, some patients with IBS can be detected having visceral hypersensitivity in response to painful rectal balloon-distention. fMRI is an objective brain imaging technique to measure the change in regional cerebral activation more precisely. In this study, IC and PFC of the IBS patients were the major loci of the CNS processing of visceral perception.展开更多
目的探讨阿托伐他汀对局灶缺血性大鼠脑水肿的影响及对水通道蛋白(aquaporin,AQP)的调节作用。方法选择健康清洁级成年雄性SD大鼠60只,采用随机数表法随机分为假手术组,模型组,阿托伐他汀组,每组20只。模型组和阿托伐他汀组采用大脑中...目的探讨阿托伐他汀对局灶缺血性大鼠脑水肿的影响及对水通道蛋白(aquaporin,AQP)的调节作用。方法选择健康清洁级成年雄性SD大鼠60只,采用随机数表法随机分为假手术组,模型组,阿托伐他汀组,每组20只。模型组和阿托伐他汀组采用大脑中动脉栓塞再灌注法造模。阿托伐他汀组术前连续7 d给予阿托伐他汀5 mg/(kg·d)灌胃,模型组及假手术组连续7 d接受等剂量生理盐水。大鼠脑缺血再灌注24 h后解剖取材,测定脑组织含水量,RT-PCR和蛋白免疫印迹法分别检测AQP-1、AQP-4、AQP-9 mRNA和蛋白表达。结果假手术组、模型组和阿托伐他汀组脑组织含水率比较,差异有统计学意义(F=21.767,P=0.000)。模型组脑组织含水率明显高于假手术组[(63±9)%vs(42±4)%,P<0.01];阿托伐他汀组脑组织含水率明显低于模型组,差异有统计学意义[(49±2)%vs(63%±9)%,P<0.01]。3组AQP4 mRNA和蛋白表达比较,差异有统计学意义(P=0.000)。模型组AQP4 mRNA和蛋白表达明显高于假手术组(1.27±0.17 vs 0.43±0.06,0.25±0.03 vs 0.10±0.01,P<0.01);阿托伐他汀组AQP4 mRNA和蛋白表达明显低于模型组(0.61±0.07 vs 1.27±0.17,0.16±0.04 vs 0.25±0.03,P<0.01)。结论阿托伐他汀能减轻脑缺血再灌注大鼠的脑水肿,其作用机制可能是通过抑制AQP4的表达。展开更多
文摘AIM: Irritable bowel syndrome (IBS) is characterized by abdominal pain and changes in stool habits. Visceral hypersensitivity is a key factor in the pathophysiology of IBS. The aim of this study was to examine the effect of rectal balloon-distention stimulus by blood oxygenation leveldependent functional magnetic resonance imaging (BOLDfMRI) in visceral pain center and to compare the distribution,extent, and intensity of activated areas between IBS patients and normal controls.
METHODS: Twenty-six patients with IBS and eleven normal controls were tested for rectal sensation, and the subjective pain intensity at 90 ml and 120 ml rectal balloon-distention was reported by using Visual Analogue Scale. Then, BOLDfMRI was performed at 30 ml, 60 ml, 90 ml, and 120 ml rectal balloon-distention in all subjects.
RESULTS: Rectal distention stimulation increased the activity of anterior cingulate cortex (35/37), insular cortex (37/37),prefrontal cortex (37/37), and thalamus (35/37) in most cases.At 120 ml of rectal balloon-distention, the activation area and percentage change in MR signal intensity of the regions of interest (ROI) at IC, PFC, and THAL were significantly greater in patients with IBS than that in controls. Score of pain sensation at 90 ml and 120 ml rectal balloon-distention was significantly higher in patients with IBS than that in controls.
CONCLUSION: Using fMRI, some patients with IBS can be detected having visceral hypersensitivity in response to painful rectal balloon-distention. fMRI is an objective brain imaging technique to measure the change in regional cerebral activation more precisely. In this study, IC and PFC of the IBS patients were the major loci of the CNS processing of visceral perception.
文摘目的探讨阿托伐他汀对局灶缺血性大鼠脑水肿的影响及对水通道蛋白(aquaporin,AQP)的调节作用。方法选择健康清洁级成年雄性SD大鼠60只,采用随机数表法随机分为假手术组,模型组,阿托伐他汀组,每组20只。模型组和阿托伐他汀组采用大脑中动脉栓塞再灌注法造模。阿托伐他汀组术前连续7 d给予阿托伐他汀5 mg/(kg·d)灌胃,模型组及假手术组连续7 d接受等剂量生理盐水。大鼠脑缺血再灌注24 h后解剖取材,测定脑组织含水量,RT-PCR和蛋白免疫印迹法分别检测AQP-1、AQP-4、AQP-9 mRNA和蛋白表达。结果假手术组、模型组和阿托伐他汀组脑组织含水率比较,差异有统计学意义(F=21.767,P=0.000)。模型组脑组织含水率明显高于假手术组[(63±9)%vs(42±4)%,P<0.01];阿托伐他汀组脑组织含水率明显低于模型组,差异有统计学意义[(49±2)%vs(63%±9)%,P<0.01]。3组AQP4 mRNA和蛋白表达比较,差异有统计学意义(P=0.000)。模型组AQP4 mRNA和蛋白表达明显高于假手术组(1.27±0.17 vs 0.43±0.06,0.25±0.03 vs 0.10±0.01,P<0.01);阿托伐他汀组AQP4 mRNA和蛋白表达明显低于模型组(0.61±0.07 vs 1.27±0.17,0.16±0.04 vs 0.25±0.03,P<0.01)。结论阿托伐他汀能减轻脑缺血再灌注大鼠的脑水肿,其作用机制可能是通过抑制AQP4的表达。
