由于单金属Bi在CO_(2)还原反应(CO_(2)RR)中效率较低,通过表面工程复合材料提高电导率和产率是一种有吸引力的方法.在此,我们重构了在三维纳米孔铜结构中的原位生长金属Bi纳米颗粒.得益于三维纳米多孔导电网络和Cu与Bi之间的强相互作用,...由于单金属Bi在CO_(2)还原反应(CO_(2)RR)中效率较低,通过表面工程复合材料提高电导率和产率是一种有吸引力的方法.在此,我们重构了在三维纳米孔铜结构中的原位生长金属Bi纳米颗粒.得益于三维纳米多孔导电网络和Cu与Bi之间的强相互作用,Bi@np-Cu费米能级向上移动,表现出优异的电催化二氧化碳还原性能.Bi@np-Cu在-0.97 V的电位下具有97.7%的甲酸法拉第效率,电流密度为82 mA cm^(-2).重要的是,该催化剂在连续催化反应40 h后仍能实现超过90%的法拉第效率.DFT计算表明,np-Cu有效地调节了Bi的电子态,优化了中间吸附能,从而提高了Bi的本征活性.这项工作为纳米多孔金属在催化中的应用提供了一个新视角.展开更多
Arterial vasospasm after microsurgery can cause severe obstruction of blood flow manifested as low tissue temperature,leading to tissue necrosis.The timely discovery and synchronized treatment become pivotal.In this s...Arterial vasospasm after microsurgery can cause severe obstruction of blood flow manifested as low tissue temperature,leading to tissue necrosis.The timely discovery and synchronized treatment become pivotal.In this study,a reversible,intelligent,responsive thermosensitive hydrogel system is constructed employing both the gel–sol transition and the sol–gel transition.The“reversible thermosensitive(RTS)”hydrogel loaded with verapamil hydrochloride is designed to dynamically and continuously regulate the extravascular microenvi-ronment by inhibiting extracellular calcium influx.After accurate implantation and following in situ gelation,the RTS hydrogel reverses to the sol state causing massive drug release to inhibit vasospasm when the tissue tem-perature drops to the predetermined transition temperature.Subsequent restoration of the blood supply allevi-ates further tissue injury.Before the temperature drops,the RTS hydrogel maintains the gel state as a sustained-release reservoir to prevent vasospasm.The inhibition of calcium influx and vasospasm in vitro and in vivo is demonstrated using vascular smooth muscle cells,mice mesenteric arterial rings,and vascular ultrasonic Doppler detection.Subsequent animal experiments demonstrate that RTS hydrogel can promote tissue survival and alleviate tissue injury responding to temperature change.Therefore,this RTS hydrogel holds therapeutic po-tential for diseases requiring timely detection of temperature change.展开更多
Aim:Chemoresistance is the biggest obstacle in cancer treatment.Our previous study demonstrated that Shenmai injection(SMI),a Chinese herbal medicine,enhanced the antitumor effect of cisplatin via glucose metabolism r...Aim:Chemoresistance is the biggest obstacle in cancer treatment.Our previous study demonstrated that Shenmai injection(SMI),a Chinese herbal medicine,enhanced the antitumor effect of cisplatin via glucose metabolism reprogramming.This study aimed to further determine whether the SMI sensitizes the non-small cell lung cancer(NSCLC)cells to cisplatin through regulation mitochondrial dynamics.Methods:The Kaplan-Meier Plotter database was used to investigate the relationship between mRNA expression of mitofusin-2(Mfn2)and the survival analysis of NSCLC patients.The protein expression of Mfn2 in a lung adenocarcinoma tissue chip was detected by immunohistochemistry staining.The expression of Mfn2 and ATAD3A were compared between cisplatin-sensitive A549 and cisplatin-resistant A549/DDP cells.Additionally,A549/DDP cells were co-treated with cisplatin and SMI to detect mitochondrial morphology by fluorescent staining,apoptosis-related protein expression with Western blotting,and mitochondrial membrane potential(ΔΨm)with flow cytometry analysis.Results:The mean survival time of the Mfn2^(low) group was significantly lower than that of the Mfn2^(high) group by Kaplan-Meier Plotter database analysis,and the Mfn2 protein expression level was lower in cancer tissues than in adjacent tissues.The combination of SMI and cisplatin induced dynamic changes in A549/DDP cells,with increased mitochondrial fusion followed by upregulation of Mfn2 and downregulation of ATAD3A and reduced mitochondrial mass and ΔΨm.Moreover,SMI significantly enhanced cisplatin-induced A549/DDP apoptosis,upregulated Bax and the active subunit of caspase-3,and downregulated Bcl-2 expression,as shown via Hoechst staining and flow cytometry analysis.Conclusion:Our findings suggest SMI enhances cisplatin-induced apoptosis through regulation of Mfn2-dependent mitochondrial dynamics in cisplatin-resistant lung adenocarcinoma cells.展开更多
基金supported by the National Key R&D Program of China (2021YFB3802900)the Major Program of the National Natural Science Foundation of China (52192604)+4 种基金the Higher Educational Youth Innovation Science and Technology Program Shandong Province(2021KJ022)Taishan Scholars Program (tsqn201909107)the Natural Science Foundation of Shandong Province (ZR2020QF077)the National Natural Science Foundation of China (62104131)the Postdoctoral Science Foundation of Shandong Province (4456322)。
文摘由于单金属Bi在CO_(2)还原反应(CO_(2)RR)中效率较低,通过表面工程复合材料提高电导率和产率是一种有吸引力的方法.在此,我们重构了在三维纳米孔铜结构中的原位生长金属Bi纳米颗粒.得益于三维纳米多孔导电网络和Cu与Bi之间的强相互作用,Bi@np-Cu费米能级向上移动,表现出优异的电催化二氧化碳还原性能.Bi@np-Cu在-0.97 V的电位下具有97.7%的甲酸法拉第效率,电流密度为82 mA cm^(-2).重要的是,该催化剂在连续催化反应40 h后仍能实现超过90%的法拉第效率.DFT计算表明,np-Cu有效地调节了Bi的电子态,优化了中间吸附能,从而提高了Bi的本征活性.这项工作为纳米多孔金属在催化中的应用提供了一个新视角.
基金National Key Research and Development Program of China(2020YFA0908200)National Natural Science Foundation of China(81772099,81801928 and 52103173)+3 种基金China Postdoctoral Science Foundation(2021M692105)Shanghai Municipal Health Commission(20204Y0354)Shanghai Municipal Key Clinical Specialty(shslczdzk00901)Young Physicians Innovation Team Project of the Ninth People’s Hospital of Shanghai Jiao Tong University School of Medicine(QC201902).
文摘Arterial vasospasm after microsurgery can cause severe obstruction of blood flow manifested as low tissue temperature,leading to tissue necrosis.The timely discovery and synchronized treatment become pivotal.In this study,a reversible,intelligent,responsive thermosensitive hydrogel system is constructed employing both the gel–sol transition and the sol–gel transition.The“reversible thermosensitive(RTS)”hydrogel loaded with verapamil hydrochloride is designed to dynamically and continuously regulate the extravascular microenvi-ronment by inhibiting extracellular calcium influx.After accurate implantation and following in situ gelation,the RTS hydrogel reverses to the sol state causing massive drug release to inhibit vasospasm when the tissue tem-perature drops to the predetermined transition temperature.Subsequent restoration of the blood supply allevi-ates further tissue injury.Before the temperature drops,the RTS hydrogel maintains the gel state as a sustained-release reservoir to prevent vasospasm.The inhibition of calcium influx and vasospasm in vitro and in vivo is demonstrated using vascular smooth muscle cells,mice mesenteric arterial rings,and vascular ultrasonic Doppler detection.Subsequent animal experiments demonstrate that RTS hydrogel can promote tissue survival and alleviate tissue injury responding to temperature change.Therefore,this RTS hydrogel holds therapeutic po-tential for diseases requiring timely detection of temperature change.
基金supported by the National Key Research and Development Program of China(2020YFA0908200)the National Natural Science Foundation of China(82272263,82002053,and 82202467)+2 种基金Shanghai Municipal Health Commission(20204Y0354)Shanghai Science and Technology Development Funds(22YF1421400)Shanghai Clinical Research Center of Plastic and Reconstructive Surgery supported by Science and Technology Commission of Shanghai Municipality(22MC1940300)。
基金This work was financially supported by the National Natural Science Fund of China(Grants 82174254,81774184 and 81973735).
文摘Aim:Chemoresistance is the biggest obstacle in cancer treatment.Our previous study demonstrated that Shenmai injection(SMI),a Chinese herbal medicine,enhanced the antitumor effect of cisplatin via glucose metabolism reprogramming.This study aimed to further determine whether the SMI sensitizes the non-small cell lung cancer(NSCLC)cells to cisplatin through regulation mitochondrial dynamics.Methods:The Kaplan-Meier Plotter database was used to investigate the relationship between mRNA expression of mitofusin-2(Mfn2)and the survival analysis of NSCLC patients.The protein expression of Mfn2 in a lung adenocarcinoma tissue chip was detected by immunohistochemistry staining.The expression of Mfn2 and ATAD3A were compared between cisplatin-sensitive A549 and cisplatin-resistant A549/DDP cells.Additionally,A549/DDP cells were co-treated with cisplatin and SMI to detect mitochondrial morphology by fluorescent staining,apoptosis-related protein expression with Western blotting,and mitochondrial membrane potential(ΔΨm)with flow cytometry analysis.Results:The mean survival time of the Mfn2^(low) group was significantly lower than that of the Mfn2^(high) group by Kaplan-Meier Plotter database analysis,and the Mfn2 protein expression level was lower in cancer tissues than in adjacent tissues.The combination of SMI and cisplatin induced dynamic changes in A549/DDP cells,with increased mitochondrial fusion followed by upregulation of Mfn2 and downregulation of ATAD3A and reduced mitochondrial mass and ΔΨm.Moreover,SMI significantly enhanced cisplatin-induced A549/DDP apoptosis,upregulated Bax and the active subunit of caspase-3,and downregulated Bcl-2 expression,as shown via Hoechst staining and flow cytometry analysis.Conclusion:Our findings suggest SMI enhances cisplatin-induced apoptosis through regulation of Mfn2-dependent mitochondrial dynamics in cisplatin-resistant lung adenocarcinoma cells.
