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| 1 | The effect of pore size and porosity of Ti6Al4V scaffolds on MC3T3-E1 cells and tissue in rabbits显示文摘Electron beam melting(EBM) allows the fabrication of specific porous titanium implants, whereas their in vitro and in vivo biological performance should be further investigated. In this study, we examined the porous Ti6 Al4 V scaffolds(low, 334.1 μm pore size with 55.4% porosity;middle, 383.2 μm pore size with 65.2% porosity;and high, 401.6 μm pore size with 78.1%porosity) fabricated through EBM. The structural characterization and mechanical properties of porous Ti6 Al4 V scaffolds were measured through micro-computed tomography(micro-CT), scanning electron microscopy, and a material testing system.MC3 T3-E1 cells were used to assess the proliferation and differentiation of the cells on different scaffolds at day 7 and day 14 based on the expression levels of genes, including alkaline phosphatase, bone morphogenetic protein-2, osteopontin and runtrelated transcription factor-2. Rabbits with distal femoral defects were utilized to evaluate bone ingrowth in the porous titanium.All of the samples were subjected to micro-CT and histological analysis after 12 weeks. Results showed that compressive Young’s modulus of 0.3–1.1 GPa was similar to the trabecular bone. The three types of porous Ti6 Al4 V scaffolds were inclined to promote cell proliferation, whereas cell differentiation and bone ingrowth into the porous scaffolds were biased to the porous titanium with relatively large pores and porosity(middle and high). This study implied that the present porous implant design,which had the combined advantages of different pore sizes and porosity, might be meaningful and promising for trabecular bone defect restoration. | LUAN HuiQin WANG LiTing REN WeiYan CHU Zhao Wei HUANG YunFei LU ChengLin FAN YuBo | 2019 | Science China(Technological Sciences)2019，62，7： | 2 |
| 2 | Carbon Monoxide Promotes the Catalytic Hydrogenation on Metal Cluster Catalysts显示文摘Size effect plays a crucial role in catalytic hydrogenation.The highly dispersed ultrasmall clusters with a limited number of metal atoms are one candidate of the next generation catalysts that bridge the single-atom metal catalysts and metal nanoparticles.However,for the unfavorable electronic property and their interaction with the substrates,they usually exhibit sluggish activity.Taking advantage of the small size,their catalytic property would be mediated by surface binding species.The combination of metal cluster coordination chemistry brings new opportunity.CO poisoning is notorious for Pt group metal catalysts as the strong adsorption of CO would block the active centers.In this work,we will demonstrate that CO could serve as a promoter for the catalytic hydrogenation when ultrasmall Pd clusters are employed.By means of DFT calculations,we show that Pd_(n)(n=2-147)clusters display sluggish activity for hydrogenation due to the too strong binding of hydrogen atom and reaction intermediates thereon,whereas introducing CO would reduce the binding energies of vicinal sites,thus enhancing the hydrogenation reaction.Experimentally,supported Pd_(2)CO catalysts are fabricated by depositing preestablished[Pd_(2)(μ-CO)_(2)Cl_(4)]2-clusters on oxides and demonstrated as an outstanding catalyst for the hydrogenation of styrene.The promoting effect of CO is further verified experimentally by removing and reintroducing a proper amount of CO on the Pd cluster catalysts. | Ruixuan Qin Pei Wang Pengxin Liu Shiguang Mo Yue Gong Liting Ren Chaofa Xu Kunlong Liu Lin Gu Gang Fu Nanfeng Zheng | 2020 | Research2020，，1： | 0 |
| 3 | Palladium nanoplates scotch breast cancer lung metastasis by constraining epithelial-mesenchymal transition显示文摘Metastasis accounts for the majority of cancer deaths in many tumor types including breast cancer.Epithelial-mesenchymal transition(EMT)is the driving force for the occurrence and progression of metastasis,however,no targeted strategies to block the EMT program are currently available to combat metastasis.Diverse engineered nanomaterials(ENMs)have been reported to exert promising anti-cancer effects,however,no ENMs have been designed to target EMT.Palladium(Pd)nanomaterials,a type of ENM,have received substantial attention in nanomedicine due to their favorable photothermal performance for cancer therapeutics.Herein,Pd nanoplates(PdPL)were found to be preferentially biodistributed to both primary tumors and metastatic tumors.Importantly,PdPL showed a significant inhibition of lung metastasis with and without near-infrared(NIR)irradiation.Mechanistic investigations revealed that EMT was significantly compromised in breast cancer cells upon the PdPL treatment,which was partially due to the inhibition of the transforming growth factor-beta(TGF-β)signaling.Strikingly,the PdPL was found to directly interact with TGF-βproteins to diminish TGF-βfunctions in activating its downstream signaling,as evidenced by the reduced phosphorylation of Smad2.Notably,TGF-β-independent pathways were also involved in undermining EMT and other important biological processes that are necessary for metastasis.Additionally,NIR irradiation elicited synergistic effects on PdPL-induced inhibition of primary tumors and metastasis.In summary,these results revealed that the PdPL remarkably curbed metastasis by inhibiting EMT signaling,thereby indicating the promising potential of PdPL as a therapeutic agent for treating breast cancer metastasis. | Shunhao Wang Jingchao Li Mei Chen Liting Ren Wenya Feng Lining Xu Xiaolan Chen Tian Xia Nanfeng Zheng Sijin Liu | 2021 | National Science Review2021，8，7： | 0 |
| 4 | Molecular imaging:design mechanism and bioapplications显示文摘Molecular imaging is a non-invasive method to image and analyze the concentration and activity of functional biomolecules in cells or in vivo at molecular level,and plays an increasing role in deep understanding of biological processes,early and accurate diagnosis of diseases,and evaluation of treatment.Nowadays,numerous novel molecular imaging probes have been developed,involving every biomedical imaging modality,such as optical imaging,photoacoustic imaging,magnetic resonance imaging,single-photon-emission computed tomography,and positron emission tomography.In this review,we summarize the development of current state-of-the-art molecular imaging probes.We introduce the design strategies of molecular probes and detailed imaging modalities,and highlight the properties of probes and biomedical imaging applications in cells and in vivo,including disease diagnosis,drug tracking,and imaging-guided surgery.Then we discuss the perspectives and challenges in this emerging field.We expect this review could inspire more effective molecular imaging probes to be developed,achieving the goal towards clinical practices. | Lanlan Chen Yifan Lyu Xuan Zhang Liting Zheng Qingqing Li Ding Ding Fengming Chen Yihao Liu Wei Li Yutong Zhang Qiuling Huang Zhiqiang Wang Tiantian Xie Qiang Zhang Yingyu Sima Ke Li Shuai Xu Tianbing Ren Mengyi Xiong Ying Wu Jibin Song Lin Yuan Huanghao Yang Xiao-Bing Zhang Weihong Tan | 2023 | Science China Chemistry2023，66，5： | 0 |
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