背景:间充质干细胞的衰老严重影响其临床应用并且是衰老相关疾病发生的主要诱因之一,中药具有良好的抗衰老作用,可抑制间充质干细胞衰老从而促进其在组织工程中的应用并防治衰老相关疾病。目的:综述中药抑制间充质干细胞衰老的作用及机...背景:间充质干细胞的衰老严重影响其临床应用并且是衰老相关疾病发生的主要诱因之一,中药具有良好的抗衰老作用,可抑制间充质干细胞衰老从而促进其在组织工程中的应用并防治衰老相关疾病。目的:综述中药抑制间充质干细胞衰老的作用及机制。方法:检索中国知网和PubMed数据库2012-2022年关于中药抑制间充质干细胞衰老的文献,以“中药,间充质干细胞,衰老”为中文检索词,以“traditional chinese medicines,mesenchymal stem cells(MSCs),aging”为英文检索词,最终共纳入92篇文献进行分析。结果与结论:(1)文章总结了当前间充质干细胞衰老的5个主要机制:包括DNA损伤、端粒缩短、氧化应激、自噬障碍及线粒体功能障碍。(2)文章梳理了衰老间充质干细胞的表型特征,主要包括细胞体积增大、增殖和多向分化能力下降、β-半乳糖苷酶活性增加、p21及p16通路激活等。(3)文章总结了当前中药抑制间充质干细胞衰老的主要机制,包括抑制Wnt通路激活、抑制线粒体活性氧产生、促进沉默信息调节因子2同系物1、磷脂酰肌醇3-激酶/蛋白激酶B、腺苷酸活化蛋白激酶及核因子E2相关因子2通路激活、促进端粒酶反转录酶表达等。(4)目前在中药抑制间充质干细胞衰老的研究中以对骨髓间充质干细胞研究最多,效果较好。(5)左归丸、补肾调肝方、白藜芦醇及黄芪等中药均可通过促进衰老间充质干细胞增殖及成骨分化起到防治骨质疏松作用,但对中药通过抑制间充质干细胞衰老改善间充质干细胞旁分泌功能及防治其他衰老相关疾病的机制仍需进一步探究。展开更多
Mn_(3)TeO_(6)(MTO) has been experimentally found to adopt a P2_(1)/In structure under high pressure,which exhibits a significantly smaller band gap compared to the atmospheric R3 phase.In this study,we systematically ...Mn_(3)TeO_(6)(MTO) has been experimentally found to adopt a P2_(1)/In structure under high pressure,which exhibits a significantly smaller band gap compared to the atmospheric R3 phase.In this study,we systematically investigate the magnetism,structural phase transition,and electronic properties of MTO under high pressure through first-principles calculations.Both R3 and P2_(1)/n phases of MTO are antiferromagnetic at zero temperature.The R3 phase transforms to the P2_(1)/n phase at 7.5 8 GPa,accompanied by a considerable volume collapse of about 6.47%.Employing the accurate method that combines DFT+U/and GW,the calculated band gap of R3 phase at zero pressure is very close to the experimental values,while that of the P2_(1)/n phase is significantly overestimated.The main reason for this difference is that the experimental study incorrectly used the Kubelka-Munk plot for the indirect band gap to obtain the band gap of the P2_(1)/n phase instead of the Kubelka-Munk plot for the direct band gap.Furthermore,our study reveals that the transition from the R3 phase to the P2_(1)/n phase is accompanied by a slight reduction in the band gap.展开更多
文摘背景:间充质干细胞的衰老严重影响其临床应用并且是衰老相关疾病发生的主要诱因之一,中药具有良好的抗衰老作用,可抑制间充质干细胞衰老从而促进其在组织工程中的应用并防治衰老相关疾病。目的:综述中药抑制间充质干细胞衰老的作用及机制。方法:检索中国知网和PubMed数据库2012-2022年关于中药抑制间充质干细胞衰老的文献,以“中药,间充质干细胞,衰老”为中文检索词,以“traditional chinese medicines,mesenchymal stem cells(MSCs),aging”为英文检索词,最终共纳入92篇文献进行分析。结果与结论:(1)文章总结了当前间充质干细胞衰老的5个主要机制:包括DNA损伤、端粒缩短、氧化应激、自噬障碍及线粒体功能障碍。(2)文章梳理了衰老间充质干细胞的表型特征,主要包括细胞体积增大、增殖和多向分化能力下降、β-半乳糖苷酶活性增加、p21及p16通路激活等。(3)文章总结了当前中药抑制间充质干细胞衰老的主要机制,包括抑制Wnt通路激活、抑制线粒体活性氧产生、促进沉默信息调节因子2同系物1、磷脂酰肌醇3-激酶/蛋白激酶B、腺苷酸活化蛋白激酶及核因子E2相关因子2通路激活、促进端粒酶反转录酶表达等。(4)目前在中药抑制间充质干细胞衰老的研究中以对骨髓间充质干细胞研究最多,效果较好。(5)左归丸、补肾调肝方、白藜芦醇及黄芪等中药均可通过促进衰老间充质干细胞增殖及成骨分化起到防治骨质疏松作用,但对中药通过抑制间充质干细胞衰老改善间充质干细胞旁分泌功能及防治其他衰老相关疾病的机制仍需进一步探究。
基金Project supported by National Key Research and Development Program of China(Grant No.2021YFB3802300)the Natural Science Foundation of China Academy of Engineering Physics(Grant Nos.U1730248 and U1830101)the National Natural Science Foundation of China(Grant Nos.12202418,11872056,11904282,12074274,and 12174356)。
文摘Mn_(3)TeO_(6)(MTO) has been experimentally found to adopt a P2_(1)/In structure under high pressure,which exhibits a significantly smaller band gap compared to the atmospheric R3 phase.In this study,we systematically investigate the magnetism,structural phase transition,and electronic properties of MTO under high pressure through first-principles calculations.Both R3 and P2_(1)/n phases of MTO are antiferromagnetic at zero temperature.The R3 phase transforms to the P2_(1)/n phase at 7.5 8 GPa,accompanied by a considerable volume collapse of about 6.47%.Employing the accurate method that combines DFT+U/and GW,the calculated band gap of R3 phase at zero pressure is very close to the experimental values,while that of the P2_(1)/n phase is significantly overestimated.The main reason for this difference is that the experimental study incorrectly used the Kubelka-Munk plot for the indirect band gap to obtain the band gap of the P2_(1)/n phase instead of the Kubelka-Munk plot for the direct band gap.Furthermore,our study reveals that the transition from the R3 phase to the P2_(1)/n phase is accompanied by a slight reduction in the band gap.
