Prenatal alcohol exposure disrupts the development of normal fetal respiratory function, but whether it perturbs respiratory rhythmical discharge activity is unclear. Furthermore, it is unknown whether the 5-hydroxytr...Prenatal alcohol exposure disrupts the development of normal fetal respiratory function, but whether it perturbs respiratory rhythmical discharge activity is unclear. Furthermore, it is unknown whether the 5-hydroxytryptamine 2A receptor（5-HT2AR） is involved in the effects of prenatal alcohol exposure. In the present study, pregnant female rats received drinking water containing alcohol at concentrations of 0%, 1%, 2%, 4%, 8% or 10%（v/v） throughout the gestation period. Slices of the medulla from 2-day-old neonatal rats were obtained to record respiratory rhythmical discharge activity. 5-HT2 AR protein and m RNA levels in the pre-B？tzinger complex of the respiratory center were measured by western blot analysis and quantitative RT-PCR, respectively. Compared with the 0% alcohol group, respiratory rhythmical discharge activity in medullary slices in the 4%, 8% and 10% alcohol groups was decreased, and the reduction was greatest in the 8% alcohol group. Respiratory rhythmical discharge activity in the 10% alcohol group was irregular. Thus, 8% was the most effective alcohol concentration at attenuating respiratory rhythmical discharge activity. These findings suggest that prenatal alcohol exposure attenuates respiratory rhythmical discharge activity in neonatal rats by downregulating 5-HT2 AR protein and m RNA levels.展开更多
本文旨在探讨中枢呼吸兴奋剂尼可刹米对新生大鼠基本节律性呼吸的产生和调节的影响及5-HT2A受体在其中的作用。制作新生大鼠离体延髓脑片标本,含面神经后核内侧区（the medial region of the nucleus retrofacialis,mNRF）并保留舌下神...本文旨在探讨中枢呼吸兴奋剂尼可刹米对新生大鼠基本节律性呼吸的产生和调节的影响及5-HT2A受体在其中的作用。制作新生大鼠离体延髓脑片标本,含面神经后核内侧区（the medial region of the nucleus retrofacialis,mNRF）并保留舌下神经根,灌流改良Kreb＇s液（modified Kreb＇s solution,MKS）,记录舌下神经根呼吸相关节律性放电活动（respiratory-re-lated rhythmic discharge activity,RRDA）,观察不同浓度尼可刹米、5-HT2A受体特异激动剂2,5-二甲氧基-4-碘苯基丙烷[1-（2,5-dimethoxy-4-iodophenyl）-2-aminopropane,DOI]、5-HT2A受体特异拮抗剂酮舍林（ketanserine）以及联合使用尼可刹米和酮舍林对舌下神经根RRDA的影响。结果显示,尼可刹米在0.5-7μg/mL时对延髓脑片RRDA有兴奋作用,在5μg/mL时对吸气时程（inspiratory time,TI）、放电积分幅度（integral amplitude,IA）、呼吸周期（respiratory cycle,RC）等呼吸指标综合效果最显著。DOI明显延长TI、增强IA、缩短RC,对RRDA有兴奋作用。酮舍林明显缩短TI、减弱IA、延长RC,对RRDA有抑制作用。联合使用DOI和酮舍林对RRDA无明显作用。酮舍林可完全阻断尼可刹米对RC的作用,部分阻断尼可刹米对IA的作用,对尼可刹米引起的TI变化无明显影响。结果提示,尼可刹米增强新生大鼠离体延髓脑片舌下神经根RRDA,5-HT2A受体可能是尼可刹米作用途径之一。展开更多
基金the Natural Science Foundation of Henan Province in China,No.102102310156the Foundation of Xinxiang Technology Bureau in China,No.ZG14004
文摘Prenatal alcohol exposure disrupts the development of normal fetal respiratory function, but whether it perturbs respiratory rhythmical discharge activity is unclear. Furthermore, it is unknown whether the 5-hydroxytryptamine 2A receptor（5-HT2AR） is involved in the effects of prenatal alcohol exposure. In the present study, pregnant female rats received drinking water containing alcohol at concentrations of 0%, 1%, 2%, 4%, 8% or 10%（v/v） throughout the gestation period. Slices of the medulla from 2-day-old neonatal rats were obtained to record respiratory rhythmical discharge activity. 5-HT2 AR protein and m RNA levels in the pre-B？tzinger complex of the respiratory center were measured by western blot analysis and quantitative RT-PCR, respectively. Compared with the 0% alcohol group, respiratory rhythmical discharge activity in medullary slices in the 4%, 8% and 10% alcohol groups was decreased, and the reduction was greatest in the 8% alcohol group. Respiratory rhythmical discharge activity in the 10% alcohol group was irregular. Thus, 8% was the most effective alcohol concentration at attenuating respiratory rhythmical discharge activity. These findings suggest that prenatal alcohol exposure attenuates respiratory rhythmical discharge activity in neonatal rats by downregulating 5-HT2 AR protein and m RNA levels.
基金the National Natural Science Foundation of China(No.30570670)the Natural ScienceFoundation of Guangdong Province(No.5004714)
文摘本文旨在探讨中枢呼吸兴奋剂尼可刹米对新生大鼠基本节律性呼吸的产生和调节的影响及5-HT2A受体在其中的作用。制作新生大鼠离体延髓脑片标本,含面神经后核内侧区（the medial region of the nucleus retrofacialis,mNRF）并保留舌下神经根,灌流改良Kreb＇s液（modified Kreb＇s solution,MKS）,记录舌下神经根呼吸相关节律性放电活动（respiratory-re-lated rhythmic discharge activity,RRDA）,观察不同浓度尼可刹米、5-HT2A受体特异激动剂2,5-二甲氧基-4-碘苯基丙烷[1-（2,5-dimethoxy-4-iodophenyl）-2-aminopropane,DOI]、5-HT2A受体特异拮抗剂酮舍林（ketanserine）以及联合使用尼可刹米和酮舍林对舌下神经根RRDA的影响。结果显示,尼可刹米在0.5-7μg/mL时对延髓脑片RRDA有兴奋作用,在5μg/mL时对吸气时程（inspiratory time,TI）、放电积分幅度（integral amplitude,IA）、呼吸周期（respiratory cycle,RC）等呼吸指标综合效果最显著。DOI明显延长TI、增强IA、缩短RC,对RRDA有兴奋作用。酮舍林明显缩短TI、减弱IA、延长RC,对RRDA有抑制作用。联合使用DOI和酮舍林对RRDA无明显作用。酮舍林可完全阻断尼可刹米对RC的作用,部分阻断尼可刹米对IA的作用,对尼可刹米引起的TI变化无明显影响。结果提示,尼可刹米增强新生大鼠离体延髓脑片舌下神经根RRDA,5-HT2A受体可能是尼可刹米作用途径之一。
