The activation of the PI3K/AKT/m TOR pathway plays a key role in ovarian cancer tumorigenesis, progression and chemotherapy resistance. This study aimed to explore the possible mechanism that PI-103, a dual inhibitor ...The activation of the PI3K/AKT/m TOR pathway plays a key role in ovarian cancer tumorigenesis, progression and chemotherapy resistance. This study aimed to explore the possible mechanism that PI-103, a dual inhibitor of phosphatidylinositide 3-kinase and m TOR, enhances the sensitivity of SKOV3/DDP ovarian cancer cell line to cisplatin chemotherapy. The results showed that PI-103 could significantly increase the sensitivity of SKVO3/DDP cells to cisplatin through inhibiting the activation of PI3K/Akt/m TOR signaling pathway and inducing cell cycle arrest and apoptosis.展开更多
Shenmai injection(SMI)is a well-defined herbal preparation that is widely and clinically used as an adjuvant therapy for cancer.Previously,we found that SMI synergistically enhanced the activity of chemotherapy on col...Shenmai injection(SMI)is a well-defined herbal preparation that is widely and clinically used as an adjuvant therapy for cancer.Previously,we found that SMI synergistically enhanced the activity of chemotherapy on colorectal cancer by promoting the distribution of drugs in xenograft tumors.However,the underlying mechanisms and bioactive constituents remained unknown.In the present work,the regulatory effects of SMI on tumor vasculature were determined,and the potential anti-angiogenic components targeting tumor endothelial cells(TECs)were identified.Multidimensional pharmacokinetic profiles of ginsenosides in plasma,subcutaneous tumors,and TECs were investigated.The results showed that the concentrations of protopanaxadiol-type(PPD)ginsenosides(Rb1,Rb2/Rb3,Rc,and Rd)in both plasma and tumors,were higher than those of protopanaxatriol-type(Rg1 and Re)and oleanane-type(Ro)ginsenosides.Among PPD-type ginsenosides,Rd exhibited the greatest concentrations in tumors and TECs after repeated injection.In vivo bioactivity results showed that Rd suppressed neovascularization in tumors,normalized the structure of tumor vessels,and improved the anti-tumor effect of 5-fluorouracil(5 FU)in xenograft mice.Furthermore,Rd inhibited the migration and tube formation capacity of endothelial cells in vitro.In conclusion,Rd may be an important active form to exert the anti-angiogenic effect on tumor after SMI treatment.展开更多
甜味是食物摄入的重要驱动因素,是最受欢迎的味觉之一。目前,甜味信号的传导通路与影响甜味感觉的机制已有初步了解,人体甜味感觉至少由两类信号通路表达,一类由味觉受体第一家族成员2(taste receptor family 1 member 2,T1R2)和味觉受...甜味是食物摄入的重要驱动因素,是最受欢迎的味觉之一。目前,甜味信号的传导通路与影响甜味感觉的机制已有初步了解,人体甜味感觉至少由两类信号通路表达,一类由味觉受体第一家族成员2(taste receptor family 1 member 2,T1R2)和味觉受体第一家族成员3(taste receptor family 1 member 3,T1R3)形成的异源二聚体介导;另一类由钠-葡萄糖共转运蛋白与葡萄糖转运蛋白介导。本文综述了T1R2/T1R3异源二聚体结构以及甜味信号传导机制,探讨了苦味、酸味、鲜味、抗甜物质、香气化合物、唾液、肥胖、年龄等体内、外因素对甜味感知的影响;并指出了当前研究的不足之处:目前使用的无热量甜味剂(noncaloric sweeteners,NCSs)在减轻肥胖和糖尿病方面收效甚微,其他四味对甜味感觉的交叉互作研究较少,抗甜物质的调节机制在受体水平上的分子基础仍不清楚,甜味研究中使用啮齿动物代替人类具有一定的局限性。本文旨在理解甜味物质如何从复杂的基质中发挥作用,为今后NCSs食品的开发与应用提供理论支持与思路借鉴。展开更多
We introduce a set of criterions for classifying signature-only signature models. By the criterions, we classify signature models into 5 basic types and 69 general classes. Theoretically, 21141 kinds of signature mode...We introduce a set of criterions for classifying signature-only signature models. By the criterions, we classify signature models into 5 basic types and 69 general classes. Theoretically, 21141 kinds of signature models can be derived by appropriately combining different general classes. The result comprises almost existing signature models. It will be helpful for exploring new signature models. To the best of our knowledge, it is the first time for investigation of the problem of classification of signature-only signature models.展开更多
In this paper we study the computation of the number of isomorphism classes of hyperelliptic curves of genus 2 over finite fields Fq with q even. We show the formula of the number of isomorphism classes, that is, for ...In this paper we study the computation of the number of isomorphism classes of hyperelliptic curves of genus 2 over finite fields Fq with q even. We show the formula of the number of isomorphism classes, that is, for q = 2m, if 4 (|) m, then the formula is 2q3 + q2 - q;if 4 | m, then the formula is 2q3 + q2 - q + 8. These results can be used in the classification problems and the hyperelliptic curve cryptosystems.展开更多
钴酸锂因其高体积能量密度、优异的倍率容量和良好的循环性能,是3C类电子产品的主导正极材料,且目前实际应用的钴酸锂材料克容量约为理论容量的65%,还具有进一步开发的潜力。采用溶胶–凝胶法对正极材料LiCoO_(2)进行锂离子导体材料LiAl...钴酸锂因其高体积能量密度、优异的倍率容量和良好的循环性能,是3C类电子产品的主导正极材料,且目前实际应用的钴酸锂材料克容量约为理论容量的65%,还具有进一步开发的潜力。采用溶胶–凝胶法对正极材料LiCoO_(2)进行锂离子导体材料LiAlSiO_(4)包覆,研究了LiAlSiO_(4)及热处理温度对材料结构、形貌和电化学性能的影响。结果表明:热处理过程中Al^(3+)可进入LiCoO_(2)晶格,形成固溶体LiCoO_(2)Al_(x)O_(2)LiAlSiO_(4)在钴酸锂颗粒表面形成惰性的包覆层,有效地改善了钴酸锂材料在高电压下的循环和倍率性能。当热处理温度为600℃时,LiAlSiO_(4)包覆的钴酸锂材料综合性能达到最优。该样品在2.75~4.55 V的电压范围内,0.5 C倍率下室温放电比容量为209.3 m A·h/g,50次循环后的放电比容量为201.6 m A·h/g(容量保留率96.3%),且在8 C倍率下依然能释放出160.0 m A·h/g的比容量。展开更多
基金supported by the National Natural Science Foundation of China (30973475)the Natural Science Foundation of Jiangsu Province (BK2012749)the Maternal and Child Health Research Project of Jiangsu Province (F201351)
文摘The activation of the PI3K/AKT/m TOR pathway plays a key role in ovarian cancer tumorigenesis, progression and chemotherapy resistance. This study aimed to explore the possible mechanism that PI-103, a dual inhibitor of phosphatidylinositide 3-kinase and m TOR, enhances the sensitivity of SKOV3/DDP ovarian cancer cell line to cisplatin chemotherapy. The results showed that PI-103 could significantly increase the sensitivity of SKVO3/DDP cells to cisplatin through inhibiting the activation of PI3K/Akt/m TOR signaling pathway and inducing cell cycle arrest and apoptosis.
基金supported by the China National Nature Science Foundation(81573496,81773989,81530098 and 81573494)National Research Council of Science and Technology Major Project of China(2017ZX09201004-019 and 2019ZX09721001006-005)+6 种基金International Science and Technology Center Program of China(2017YFE0109600)Foundation for Innovative Research Groups of the National Natural Science Foundation of China(No.81421005)Jiangsu Province Nature Science Foundation(No.BK20160076,China)Jiangsu Province“333”project,ChinaSix talent peaks project in Jiangsu Province(YY-060),ChinaNational Basic Research Program of China(973 Program,No.2017YFA0205400)“Double First-Class”University project(CPU2018GF01,China)
文摘Shenmai injection(SMI)is a well-defined herbal preparation that is widely and clinically used as an adjuvant therapy for cancer.Previously,we found that SMI synergistically enhanced the activity of chemotherapy on colorectal cancer by promoting the distribution of drugs in xenograft tumors.However,the underlying mechanisms and bioactive constituents remained unknown.In the present work,the regulatory effects of SMI on tumor vasculature were determined,and the potential anti-angiogenic components targeting tumor endothelial cells(TECs)were identified.Multidimensional pharmacokinetic profiles of ginsenosides in plasma,subcutaneous tumors,and TECs were investigated.The results showed that the concentrations of protopanaxadiol-type(PPD)ginsenosides(Rb1,Rb2/Rb3,Rc,and Rd)in both plasma and tumors,were higher than those of protopanaxatriol-type(Rg1 and Re)and oleanane-type(Ro)ginsenosides.Among PPD-type ginsenosides,Rd exhibited the greatest concentrations in tumors and TECs after repeated injection.In vivo bioactivity results showed that Rd suppressed neovascularization in tumors,normalized the structure of tumor vessels,and improved the anti-tumor effect of 5-fluorouracil(5 FU)in xenograft mice.Furthermore,Rd inhibited the migration and tube formation capacity of endothelial cells in vitro.In conclusion,Rd may be an important active form to exert the anti-angiogenic effect on tumor after SMI treatment.
文摘甜味是食物摄入的重要驱动因素,是最受欢迎的味觉之一。目前,甜味信号的传导通路与影响甜味感觉的机制已有初步了解,人体甜味感觉至少由两类信号通路表达,一类由味觉受体第一家族成员2(taste receptor family 1 member 2,T1R2)和味觉受体第一家族成员3(taste receptor family 1 member 3,T1R3)形成的异源二聚体介导;另一类由钠-葡萄糖共转运蛋白与葡萄糖转运蛋白介导。本文综述了T1R2/T1R3异源二聚体结构以及甜味信号传导机制,探讨了苦味、酸味、鲜味、抗甜物质、香气化合物、唾液、肥胖、年龄等体内、外因素对甜味感知的影响;并指出了当前研究的不足之处:目前使用的无热量甜味剂(noncaloric sweeteners,NCSs)在减轻肥胖和糖尿病方面收效甚微,其他四味对甜味感觉的交叉互作研究较少,抗甜物质的调节机制在受体水平上的分子基础仍不清楚,甜味研究中使用啮齿动物代替人类具有一定的局限性。本文旨在理解甜味物质如何从复杂的基质中发挥作用,为今后NCSs食品的开发与应用提供理论支持与思路借鉴。
基金the Major State Basic Research Development Program of China(973 Program)(Grant No.2004CB318000) the Innovation Fund of Shanghai University
文摘We introduce a set of criterions for classifying signature-only signature models. By the criterions, we classify signature models into 5 basic types and 69 general classes. Theoretically, 21141 kinds of signature models can be derived by appropriately combining different general classes. The result comprises almost existing signature models. It will be helpful for exploring new signature models. To the best of our knowledge, it is the first time for investigation of the problem of classification of signature-only signature models.
基金supported by the National Natural Science Foundation of China(Grant Nos.10501049&90304012)973 Project(Grant No.2004CB318000).
文摘In this paper we study the computation of the number of isomorphism classes of hyperelliptic curves of genus 2 over finite fields Fq with q even. We show the formula of the number of isomorphism classes, that is, for q = 2m, if 4 (|) m, then the formula is 2q3 + q2 - q;if 4 | m, then the formula is 2q3 + q2 - q + 8. These results can be used in the classification problems and the hyperelliptic curve cryptosystems.
文摘钴酸锂因其高体积能量密度、优异的倍率容量和良好的循环性能,是3C类电子产品的主导正极材料,且目前实际应用的钴酸锂材料克容量约为理论容量的65%,还具有进一步开发的潜力。采用溶胶–凝胶法对正极材料LiCoO_(2)进行锂离子导体材料LiAlSiO_(4)包覆,研究了LiAlSiO_(4)及热处理温度对材料结构、形貌和电化学性能的影响。结果表明:热处理过程中Al^(3+)可进入LiCoO_(2)晶格,形成固溶体LiCoO_(2)Al_(x)O_(2)LiAlSiO_(4)在钴酸锂颗粒表面形成惰性的包覆层,有效地改善了钴酸锂材料在高电压下的循环和倍率性能。当热处理温度为600℃时,LiAlSiO_(4)包覆的钴酸锂材料综合性能达到最优。该样品在2.75~4.55 V的电压范围内,0.5 C倍率下室温放电比容量为209.3 m A·h/g,50次循环后的放电比容量为201.6 m A·h/g(容量保留率96.3%),且在8 C倍率下依然能释放出160.0 m A·h/g的比容量。
