AIM： To study the morphology and ontogeny of dendritic cells of Peyer＇s patches in rats at different development periods. METHODS： The morphometric and flow cytometric analyses were performed to detect all the para...AIM： To study the morphology and ontogeny of dendritic cells of Peyer＇s patches in rats at different development periods. METHODS： The morphometric and flow cytometric analyses were performed to detect all the parameters of villous-crypts axis and the number of OX62＋DC, OX62＋CD4＋SIRP＋DC, and OX62＋CD4-SIRP-DC in the small intestine in different groups of rats. The relationship between the parameters of villous-axis and the number of DC and DC subtype were analyzed. RESULTS： All morphometric parameters changed significantly with the development of pups in the different age groups （F = 10.751, 12.374, 16.527, 5.291, 3.486; P = 0.000, 0.000, 0.000, 0.001, 0.015）. Villous height levels were unstable and increased from 115.24μm to 140.43 μm as early as 3 wk postpartum. Villous area increased significantly between 5 and 7 wk postpartum, peeked up to 13817.60 tam2 at 7 wk postpartum. Villous height and crypt depth ratios were relatively stable and increased significantly from 2.80 ＋ 1.01 to 4.54 =1= 1.56, 9-11 wk postpartum. The expression of OX62＋DC increased from 33.30%±5.80% to 80%± 17.30%, 3-11 wk postpartum （F =5.536, P = 0.0013）. OX62＋CD4＋SIRP＋DC subset levels detected in single-cell suspensions of rat total Peyer＇s patch dendritic cells （PP-DCs） increased significantly from 30.73% ± 5.16% to 35.50% ± 4.08%, 5-7 wk postpartum and from 34.20% ±1.35% to 43.60% ± 2.07% 9-11 wk postpartum （F = 7.216, P = 0.005）. CONCLUSION： This study confirms the agerelated changes in villous-crypt axis differentiation in the small intestine. Simultaneously, there are also development and maturation in rat PP-DCs phenotypic expression. Furthermore, the morphological changes of intestinal mucosa and the development of immune cells （especially DC） peaked at 9-11 wk postpartum, indicating that the intestinal mucosae reached a relatively mature state at 11 wk postpartum.展开更多
INTRODUCTIONCrypt epithelial cells in normal small intestineproliferate at a high speed. But they are verydifficult to culture in vitro and passage stably. A lotof studies have been done[1-16]. Some domestic labsisola...INTRODUCTIONCrypt epithelial cells in normal small intestineproliferate at a high speed. But they are verydifficult to culture in vitro and passage stably. A lotof studies have been done[1-16]. Some domestic labsisolated and cultured crypt cells from embryonalintestines and aseptic animal intestine, but failed.We introduced normal rat epithelial cell line-IEC-6from the USA and its living condition for stablepassage was successfully established after trials. Thecell line was testified to be the small intestinalepithelial cell by electron microscopy,immunihistochemistry and enzymatic histoch-emistry. It has been applied to some relatedresearch work[17-21]. It was found that manyfactors were involved in the culture system. Ourpresent study focuses on the culture method and theinfluencing factors on IEC-6.展开更多
背景:肠黏膜更新是维持机体稳态的关键生理过程,其中隐窝干细胞是肠上皮增殖和分化的驱动力。沉默信息调节因子(silent information regulator,SIRT)参与细胞的基因修复、代谢、能量平衡和寿命的调节,在肠上皮稳态中的研究逐步成为热点...背景:肠黏膜更新是维持机体稳态的关键生理过程,其中隐窝干细胞是肠上皮增殖和分化的驱动力。沉默信息调节因子(silent information regulator,SIRT)参与细胞的基因修复、代谢、能量平衡和寿命的调节,在肠上皮稳态中的研究逐步成为热点。肠类器官由单个隐窝干细胞经3D培养形成,可体外呈现肠上皮更新及受损后修复过程,是研究肠黏膜更新的最新模式。目的:探究SIRT6基因特异性敲除(SIRT6-i/-i)小鼠模型肠黏膜形态、肠类器官形成及其转录组学的特征性变化。方法:①采用Cre-loxp方法建立SIRT6-i/-i小鼠模型,制备小肠组织石蜡切片并进行苏木精-伊红染色,观察其病理变化,免疫组化检测肠干细胞标记物Lgr5和潘氏细胞标记物溶菌酶的表达;②体外构建SIRT6-i/-i小鼠肠类器官模型,Western-blot检测类器官SIRT6蛋白变化,免疫荧光检测肠类器官Lgr5、细胞角蛋白20和黏蛋白2蛋白表达变化;③采用肠组织进行转录组测序,分析该模型小鼠差异基因及相关功能的特征变化。结果与结论:①与野生型对照小鼠肠黏膜形态比较,SIRT6-i/-i小鼠肠黏膜出现绒毛稀疏、变短,隐窝高度变浅,且杯状细胞数目增多,潘氏细胞数目明显减少,Lgr5和溶菌酶的表达明显降低;②SIRT6-i/-i小鼠肠类器官中SIRT6蛋白表达明显降低,培养中出芽率明显减少,且Lgr5表达降低,吸收上皮细胞标记物细胞角蛋白20和杯状细胞标记物黏蛋白2表达水平升高;③转录组结果显示,与野生型对照小鼠比较,模型小鼠肠组织的差异基因有846个,其中上调基因438个,下调基因408个,差异基因在京都基因与基因组百科全书通路富集前5位的分别是化学致癌、药物代谢、视黄酸代谢、亚油酸代谢和类固醇生物合成,显著富集通路中关联的基因主要为Cyp2c29、Cyp2c65、Cyp3a11、Cyp3a25等Cyp450家族的改变;④结果表明,SIRT6缺失会导致肠道干细胞增殖和分化展开更多
基金Supported by Grants from the National Natural Science Foundation of China,No.30571979
文摘AIM： To study the morphology and ontogeny of dendritic cells of Peyer＇s patches in rats at different development periods. METHODS： The morphometric and flow cytometric analyses were performed to detect all the parameters of villous-crypts axis and the number of OX62＋DC, OX62＋CD4＋SIRP＋DC, and OX62＋CD4-SIRP-DC in the small intestine in different groups of rats. The relationship between the parameters of villous-axis and the number of DC and DC subtype were analyzed. RESULTS： All morphometric parameters changed significantly with the development of pups in the different age groups （F = 10.751, 12.374, 16.527, 5.291, 3.486; P = 0.000, 0.000, 0.000, 0.001, 0.015）. Villous height levels were unstable and increased from 115.24μm to 140.43 μm as early as 3 wk postpartum. Villous area increased significantly between 5 and 7 wk postpartum, peeked up to 13817.60 tam2 at 7 wk postpartum. Villous height and crypt depth ratios were relatively stable and increased significantly from 2.80 ＋ 1.01 to 4.54 =1= 1.56, 9-11 wk postpartum. The expression of OX62＋DC increased from 33.30%±5.80% to 80%± 17.30%, 3-11 wk postpartum （F =5.536, P = 0.0013）. OX62＋CD4＋SIRP＋DC subset levels detected in single-cell suspensions of rat total Peyer＇s patch dendritic cells （PP-DCs） increased significantly from 30.73% ± 5.16% to 35.50% ± 4.08%, 5-7 wk postpartum and from 34.20% ±1.35% to 43.60% ± 2.07% 9-11 wk postpartum （F = 7.216, P = 0.005）. CONCLUSION： This study confirms the agerelated changes in villous-crypt axis differentiation in the small intestine. Simultaneously, there are also development and maturation in rat PP-DCs phenotypic expression. Furthermore, the morphological changes of intestinal mucosa and the development of immune cells （especially DC） peaked at 9-11 wk postpartum, indicating that the intestinal mucosae reached a relatively mature state at 11 wk postpartum.
基金Supported by the National Natural Science Foundation of China, No.39100119
文摘INTRODUCTIONCrypt epithelial cells in normal small intestineproliferate at a high speed. But they are verydifficult to culture in vitro and passage stably. A lotof studies have been done[1-16]. Some domestic labsisolated and cultured crypt cells from embryonalintestines and aseptic animal intestine, but failed.We introduced normal rat epithelial cell line-IEC-6from the USA and its living condition for stablepassage was successfully established after trials. Thecell line was testified to be the small intestinalepithelial cell by electron microscopy,immunihistochemistry and enzymatic histoch-emistry. It has been applied to some relatedresearch work[17-21]. It was found that manyfactors were involved in the culture system. Ourpresent study focuses on the culture method and theinfluencing factors on IEC-6.
文摘背景:肠黏膜更新是维持机体稳态的关键生理过程,其中隐窝干细胞是肠上皮增殖和分化的驱动力。沉默信息调节因子(silent information regulator,SIRT)参与细胞的基因修复、代谢、能量平衡和寿命的调节,在肠上皮稳态中的研究逐步成为热点。肠类器官由单个隐窝干细胞经3D培养形成,可体外呈现肠上皮更新及受损后修复过程,是研究肠黏膜更新的最新模式。目的:探究SIRT6基因特异性敲除(SIRT6-i/-i)小鼠模型肠黏膜形态、肠类器官形成及其转录组学的特征性变化。方法:①采用Cre-loxp方法建立SIRT6-i/-i小鼠模型,制备小肠组织石蜡切片并进行苏木精-伊红染色,观察其病理变化,免疫组化检测肠干细胞标记物Lgr5和潘氏细胞标记物溶菌酶的表达;②体外构建SIRT6-i/-i小鼠肠类器官模型,Western-blot检测类器官SIRT6蛋白变化,免疫荧光检测肠类器官Lgr5、细胞角蛋白20和黏蛋白2蛋白表达变化;③采用肠组织进行转录组测序,分析该模型小鼠差异基因及相关功能的特征变化。结果与结论:①与野生型对照小鼠肠黏膜形态比较,SIRT6-i/-i小鼠肠黏膜出现绒毛稀疏、变短,隐窝高度变浅,且杯状细胞数目增多,潘氏细胞数目明显减少,Lgr5和溶菌酶的表达明显降低;②SIRT6-i/-i小鼠肠类器官中SIRT6蛋白表达明显降低,培养中出芽率明显减少,且Lgr5表达降低,吸收上皮细胞标记物细胞角蛋白20和杯状细胞标记物黏蛋白2表达水平升高;③转录组结果显示,与野生型对照小鼠比较,模型小鼠肠组织的差异基因有846个,其中上调基因438个,下调基因408个,差异基因在京都基因与基因组百科全书通路富集前5位的分别是化学致癌、药物代谢、视黄酸代谢、亚油酸代谢和类固醇生物合成,显著富集通路中关联的基因主要为Cyp2c29、Cyp2c65、Cyp3a11、Cyp3a25等Cyp450家族的改变;④结果表明,SIRT6缺失会导致肠道干细胞增殖和分化
