Labeling analysis of three neuropeptides（Met-enkephalin, Leu-enkephalin, and neurotensin） with 7-methoxycoumarin-3-carboxylic acid N-succinimidyl ester（MCSE） was investigated. The experimental conditions for label...Labeling analysis of three neuropeptides（Met-enkephalin, Leu-enkephalin, and neurotensin） with 7-methoxycoumarin-3-carboxylic acid N-succinimidyl ester（MCSE） was investigated. The experimental conditions for labeling reaction and HPLC analysis of the neuropeptide derivatives were optimized. It was found that the labeling reatction could be achieved at 37 ℃ for one hour in H3BO3-NaCl-Na2B4O7 buffer（pH=8.3） with a labeling ratio of about 80%. The derivative mixture from the three peptides can be separated in a 40 min linear gradient from 60% to 20% of solvent A（100 mmol/L sodium acetate, pH=5.0） and from 40% to 80% of solvent B[60%（volume fraction） acetonitrile in water]. The resulting labeled products were also confirmed by MALDI-TOF-MS analysis. Compared with the native neuropeptides, the resulting labeled products have a longer absorption and fluorescence wavelengths, which is beneficial to the effective elimination of background fluorescence interference from biological matrix.展开更多
研究了干酪乳杆菌Lactobacillus casei 393在小鼠肠道中定植能力及分布规律。利用羧基荧光素二乙酸琥珀酰亚胺酯分子探针对干酪乳杆菌Lactobacillus casei 393进行标记,以每只1010mL-1的量,口服途径喂给BALB/c鼠,分别于口服后的第1,3,5,...研究了干酪乳杆菌Lactobacillus casei 393在小鼠肠道中定植能力及分布规律。利用羧基荧光素二乙酸琥珀酰亚胺酯分子探针对干酪乳杆菌Lactobacillus casei 393进行标记,以每只1010mL-1的量,口服途径喂给BALB/c鼠,分别于口服后的第1,3,5,6 d取其十二指肠、空肠、回肠、结肠等肠段,通过流式细胞仪检测肠内的标记阳性菌。实验结果显示:经口服后第5 d,干酪乳杆菌Lactobacillus casei 393开始在BALB/c鼠肠道中定植,在十二指肠、空肠、回肠、结肠的定植率分别为28.70%,29.77%,15.63%,26.17%,第6 d标记的阳性菌出现明显的生长趋势,阳性检出率分别为71.77%,57.31%,65.44%,53.13%。研究表明干酪乳杆菌Lactobacillus casei 393具有良好的肠道定植能力。展开更多
旨在建立一种可靠的体外活番鸭淋巴细胞的荧光标记方法,并用于分析番鸭呼肠孤病毒感染对雏番鸭回肠淋巴细胞归巢的影响。选择活细胞荧光染剂5(6)-羧基二乙酸荧光素琥珀酰亚胺酯(CFDA-SE,CFSE)对分离的番鸭淋巴细胞进行标记和利用流式细...旨在建立一种可靠的体外活番鸭淋巴细胞的荧光标记方法,并用于分析番鸭呼肠孤病毒感染对雏番鸭回肠淋巴细胞归巢的影响。选择活细胞荧光染剂5(6)-羧基二乙酸荧光素琥珀酰亚胺酯(CFDA-SE,CFSE)对分离的番鸭淋巴细胞进行标记和利用流式细胞术对体外标记的淋巴细胞体内示踪检测分析,并利用该方法对MDRV感染雏番鸭回肠组织的淋巴细胞数量进行流式细胞术和石蜡切片免疫荧光检测分析;结果最终确定CFSE体外标记番鸭淋巴细胞的条件为以PBS为孵育液,终浓度10μmol·L^-1,37℃30 min;试验结果表明番鸭外周血内的CFSE+淋巴细胞率基本稳定在2%~5%,CFSE^+淋巴细胞峰值出现顺序依次为脾、空肠、回肠、盲肠、十二指肠、法氏囊和胸腺;此外,感染MDRV后1~10 d MDRV组中CFSE+淋巴细胞率极显著(P<0.01)高于MOCK组,该结果与α4+淋巴细胞率和石蜡切片免疫荧光检测结果一致。结果表明本试验CFSE标记的淋巴细胞可用于体内淋巴细胞示踪,初步应用结果提示MDRV感染促进番鸭淋巴细胞向回肠归巢,为进一步阐明MDRV感染的肠道组织致病机制奠定了基础。展开更多
文摘Labeling analysis of three neuropeptides（Met-enkephalin, Leu-enkephalin, and neurotensin） with 7-methoxycoumarin-3-carboxylic acid N-succinimidyl ester（MCSE） was investigated. The experimental conditions for labeling reaction and HPLC analysis of the neuropeptide derivatives were optimized. It was found that the labeling reatction could be achieved at 37 ℃ for one hour in H3BO3-NaCl-Na2B4O7 buffer（pH=8.3） with a labeling ratio of about 80%. The derivative mixture from the three peptides can be separated in a 40 min linear gradient from 60% to 20% of solvent A（100 mmol/L sodium acetate, pH=5.0） and from 40% to 80% of solvent B[60%（volume fraction） acetonitrile in water]. The resulting labeled products were also confirmed by MALDI-TOF-MS analysis. Compared with the native neuropeptides, the resulting labeled products have a longer absorption and fluorescence wavelengths, which is beneficial to the effective elimination of background fluorescence interference from biological matrix.
文摘研究了干酪乳杆菌Lactobacillus casei 393在小鼠肠道中定植能力及分布规律。利用羧基荧光素二乙酸琥珀酰亚胺酯分子探针对干酪乳杆菌Lactobacillus casei 393进行标记,以每只1010mL-1的量,口服途径喂给BALB/c鼠,分别于口服后的第1,3,5,6 d取其十二指肠、空肠、回肠、结肠等肠段,通过流式细胞仪检测肠内的标记阳性菌。实验结果显示:经口服后第5 d,干酪乳杆菌Lactobacillus casei 393开始在BALB/c鼠肠道中定植,在十二指肠、空肠、回肠、结肠的定植率分别为28.70%,29.77%,15.63%,26.17%,第6 d标记的阳性菌出现明显的生长趋势,阳性检出率分别为71.77%,57.31%,65.44%,53.13%。研究表明干酪乳杆菌Lactobacillus casei 393具有良好的肠道定植能力。
文摘旨在建立一种可靠的体外活番鸭淋巴细胞的荧光标记方法,并用于分析番鸭呼肠孤病毒感染对雏番鸭回肠淋巴细胞归巢的影响。选择活细胞荧光染剂5(6)-羧基二乙酸荧光素琥珀酰亚胺酯(CFDA-SE,CFSE)对分离的番鸭淋巴细胞进行标记和利用流式细胞术对体外标记的淋巴细胞体内示踪检测分析,并利用该方法对MDRV感染雏番鸭回肠组织的淋巴细胞数量进行流式细胞术和石蜡切片免疫荧光检测分析;结果最终确定CFSE体外标记番鸭淋巴细胞的条件为以PBS为孵育液,终浓度10μmol·L^-1,37℃30 min;试验结果表明番鸭外周血内的CFSE+淋巴细胞率基本稳定在2%~5%,CFSE^+淋巴细胞峰值出现顺序依次为脾、空肠、回肠、盲肠、十二指肠、法氏囊和胸腺;此外,感染MDRV后1~10 d MDRV组中CFSE+淋巴细胞率极显著(P<0.01)高于MOCK组,该结果与α4+淋巴细胞率和石蜡切片免疫荧光检测结果一致。结果表明本试验CFSE标记的淋巴细胞可用于体内淋巴细胞示踪,初步应用结果提示MDRV感染促进番鸭淋巴细胞向回肠归巢,为进一步阐明MDRV感染的肠道组织致病机制奠定了基础。
