Epidermal growth factor(EGF) has been shown to improve piglet intestinal morphology and epithelial recovery. In an attempt to further understand the mechanisms behind these improvements, this study tested the hypothes...Epidermal growth factor(EGF) has been shown to improve piglet intestinal morphology and epithelial recovery. In an attempt to further understand the mechanisms behind these improvements, this study tested the hypothesis that dietary EGF may affect intestinal morphology by stimulating the proliferation and differentiation of enterocytes in weaning piglets. In piglets receiving200 μg kg^-1 EGF, crypt depth and villus height increased(P<0.05). Adding 400 μg kg^-1 EGF increased villus height-to-crypt depth ratio(P<0.05), but reduced crypt depth(P<0.05). Dietary supplementation with 200 μg kg^-1 EGF significantly increased the number of Ki67-positive cells(P<0.01) and tended to increase the mRNA level of proliferating cell nuclear antigen(P<0.10).However, this supplementation decreased the expression level of intestinal fatty acid-binding protein(P<0.05). Piglets fed with400 μg kg^-1 EGF had an increased mRNA level of intestinal alkaline phosphatase(P<0.05). The phosphorylation of m TOR(mammalian target of rapamycin) was observed in the 200 μg kg^-1 EGF group. These results suggest that dietary supplementation with a low level of EGF improved piglet intestinal morphology through stimulating the proliferation and differentiation of enterocytes, and the mTOR signaling pathway may partly be involved in this process.展开更多
哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)是一种丝/苏氨酸蛋白激酶,在调节细胞的生长、增殖和存活中起着重要的作用。mTOR复合体调控mRNA的转录、核糖体的合成及代谢相关基因的表达,通过磷酸化其下游的靶蛋白如S6...哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)是一种丝/苏氨酸蛋白激酶,在调节细胞的生长、增殖和存活中起着重要的作用。mTOR复合体调控mRNA的转录、核糖体的合成及代谢相关基因的表达,通过磷酸化其下游的靶蛋白如S6蛋白激酶和4E-BP1等来调节细胞的活动。近年来,mTOR分子及其相关信号通路在衰老调控中所起的作用渐渐被人们所认识。对mTOR信号通路在衰老中的生物学功能和调节机制的研究,不仅可以深入了解细胞自我更新和分化的机制,而且对衰老及其相关疾病的治疗、预防及寻找潜在的治疗靶点与药物具有重要意义。本文主要介绍mTOR信号通路在造血系统及其他系统衰老中研究的最新进展。展开更多
哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)是一种丝/苏氨酸蛋白激酶,在调节细胞的生长、增殖和存活中起着重要的作用。mTOR信号通路失调与许多衰老相关重大疾病如神经退行性病变、代谢综合征、肿瘤、心血管疾病等的...哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)是一种丝/苏氨酸蛋白激酶,在调节细胞的生长、增殖和存活中起着重要的作用。mTOR信号通路失调与许多衰老相关重大疾病如神经退行性病变、代谢综合征、肿瘤、心血管疾病等的发生发展密切相关,故对mTOR信号通路在衰老及衰老相关疾病中的作用机制的研究,对于揭示衰老及衰老相关疾病的发生机制具有重要意义,并为研发以mTOR信号通路为靶点的抗衰老及衰老相关疾病的治疗药物提供新策略。展开更多
哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)是一种丝/苏氨酸蛋白激酶,在细胞生长、增殖、分化、细胞周期调控等多个方面起到重要作用。近年来发现mTOR相关的信号通路复杂且涉及面广泛,其中多个元素的调控异常都与肿...哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)是一种丝/苏氨酸蛋白激酶,在细胞生长、增殖、分化、细胞周期调控等多个方面起到重要作用。近年来发现mTOR相关的信号通路复杂且涉及面广泛,其中多个元素的调控异常都与肿瘤的发生密切相关。mTOR抑制剂能够抑制由于该信号通路异常引起的癌基因的转化、肿瘤的生长和肿瘤血管生成。到目前为止,4种mTOR抑制剂被有效地应用于临床,有的已进入Ⅱ、Ⅲ期临床试验。因此,对mTOR信号通路的深入研究对肿瘤的靶向性治疗具有重要意义。展开更多
基金supported by Key Programs of Frontier Scientific Research of the Chinese Academy of Sciences(QYZDYSSW-SMC008)Natural Science Foundation of Hunan Province(2017JJ1020)Young Elite Scientists Sponsorship Program by CAST(YESS20160086)。
文摘Epidermal growth factor(EGF) has been shown to improve piglet intestinal morphology and epithelial recovery. In an attempt to further understand the mechanisms behind these improvements, this study tested the hypothesis that dietary EGF may affect intestinal morphology by stimulating the proliferation and differentiation of enterocytes in weaning piglets. In piglets receiving200 μg kg^-1 EGF, crypt depth and villus height increased(P<0.05). Adding 400 μg kg^-1 EGF increased villus height-to-crypt depth ratio(P<0.05), but reduced crypt depth(P<0.05). Dietary supplementation with 200 μg kg^-1 EGF significantly increased the number of Ki67-positive cells(P<0.01) and tended to increase the mRNA level of proliferating cell nuclear antigen(P<0.10).However, this supplementation decreased the expression level of intestinal fatty acid-binding protein(P<0.05). Piglets fed with400 μg kg^-1 EGF had an increased mRNA level of intestinal alkaline phosphatase(P<0.05). The phosphorylation of m TOR(mammalian target of rapamycin) was observed in the 200 μg kg^-1 EGF group. These results suggest that dietary supplementation with a low level of EGF improved piglet intestinal morphology through stimulating the proliferation and differentiation of enterocytes, and the mTOR signaling pathway may partly be involved in this process.
文摘哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)是一种丝/苏氨酸蛋白激酶,在调节细胞的生长、增殖和存活中起着重要的作用。mTOR复合体调控mRNA的转录、核糖体的合成及代谢相关基因的表达,通过磷酸化其下游的靶蛋白如S6蛋白激酶和4E-BP1等来调节细胞的活动。近年来,mTOR分子及其相关信号通路在衰老调控中所起的作用渐渐被人们所认识。对mTOR信号通路在衰老中的生物学功能和调节机制的研究,不仅可以深入了解细胞自我更新和分化的机制,而且对衰老及其相关疾病的治疗、预防及寻找潜在的治疗靶点与药物具有重要意义。本文主要介绍mTOR信号通路在造血系统及其他系统衰老中研究的最新进展。
文摘哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)是一种丝/苏氨酸蛋白激酶,在调节细胞的生长、增殖和存活中起着重要的作用。mTOR信号通路失调与许多衰老相关重大疾病如神经退行性病变、代谢综合征、肿瘤、心血管疾病等的发生发展密切相关,故对mTOR信号通路在衰老及衰老相关疾病中的作用机制的研究,对于揭示衰老及衰老相关疾病的发生机制具有重要意义,并为研发以mTOR信号通路为靶点的抗衰老及衰老相关疾病的治疗药物提供新策略。
文摘哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)是一种丝/苏氨酸蛋白激酶,在细胞生长、增殖、分化、细胞周期调控等多个方面起到重要作用。近年来发现mTOR相关的信号通路复杂且涉及面广泛,其中多个元素的调控异常都与肿瘤的发生密切相关。mTOR抑制剂能够抑制由于该信号通路异常引起的癌基因的转化、肿瘤的生长和肿瘤血管生成。到目前为止,4种mTOR抑制剂被有效地应用于临床,有的已进入Ⅱ、Ⅲ期临床试验。因此,对mTOR信号通路的深入研究对肿瘤的靶向性治疗具有重要意义。
