Latest ArticlesStroke is a common disease and is the major cause of death and disability. It occurs and generates devastating neurological deficits when cerebral blood vessel is blocked (ischemic stroke, IS) or ruptured (hemorrhagic stroke, HS). Hydrogel, being biodegradable and biocompatible, have shown attractive advantages in stroke therapy as a new biomaterial with desirable mechanical properties and tunability of structure, owing to special ability to load different cargoes for multiple treatment strategies, such as pharmacotherapy based on drug-delivery systems and cell therapy including mesenchymal stem cells (MSCs) and neural progenitor cells (NPCs) for improving functional outcomes. However, a comprehensive review of the functional hydrogel for treatment of stroke is still lacking. Therefore, in this work, the main pathological mechanisms of stroke including IS and HS are comprehensively described. The benefits of hydrogel for stroke treatment are also summarized regarding the natural advantages and the delivery advantages. Simultaneously, the application development of hydrogel for treatment of stroke is highlighted. Finally, the unique considerations and challenges in the design and application of hydrogel is discussed for treatment of stroke and clinical application in the future.
Forming J-aggregates by organic monomer is a fascinating strategy to urge spectroscopic redshift with respect to that of the monomer. Herein, we designed 1,7-diphenyl-substituted meso–CF3-BDP monomer confirmed by X-ray crystallographic analysis. The low-barrier rotation of the –CF3 group in meso–CF3-BDP 1 significantly enhances the non-radiative efficiency, and the photothermal conversion efficiency (PCE) of the self-assembled nanoparticles (1-NPs: λabs = 746 nm) by J-aggregates was 82%. 1-NPs could effectively block cell cycle progression, inhibit cancer cell proliferation and trigger cell apoptosis under low power laser irradiation (0.2 W/cm2). This study proposes an alternate molecular design platform by J-aggregates to promote PCE through the insertion of rotating segment and trigger the cancer cells apoptosis in photothermal therapy at low power laser density.
The misuse of antibiotics and oxygen-lacking in aquaculture causes serious water environmental problems. Herein, a piezoelectic odd-layered MoS2 is prepared and applied to piezo-catalytic remove tinidazole (TNZ) and other antibiotic pollutants with aeration as a piezo-driving force. About 89.6% of TNZ can be degraded by MoS2 under aeration in the presence of dissolved oxygen with a reaction rate constant of 0.15 min−1, which is 2.4 times higher than that under N2 atmosphere and quiescence conditions. Quenching experiments and electron paramagnetic resonance (EPR) tests identify that singlet oxygen (1O2) and superoxide radical (O2•−) are dominant reactive oxygen species in MoS2/aeration system. These results demonstrate that MoS2 can trigger a piezoelectric effect and produce charge carriers to generate reactive oxygen species with dissolved oxygen (DO) for contaminant degradation with the turbulence and water bubbles rupture driven by aeration.
Transition metal sulfides are demonstrated to play an increasingly important role in boosting the deployment of ecofriendly electrocatalytic energy conversion technologies. It is also widely recognized that the introduction of vacancies is now becoming an important and valid approach to promote the electrocatalytic performance. In this review, the significance of sulfur vacancies on the enhancement of catalytic performance via four main functionalities, including tuning the electronic structure, tailoring the active sites, improving the electrical conductivity, and regulating surface reconstruction, is comprehensively summarized. Many effective strategies for the sulfur vacancy engineering, such as plasma treatment, heteroatom doping, and chemical reduction are also comprehensively provided. Subsequently, recent achievements in sulfur vacancy fabrication on various hotspot electrocatalytic reactions are also systematically discussed. Finally, a summary of the recent progress and challenges of this interesting field are organized, which hopes to guide the future development of more efficient metal sulfide electrocatalysts.
The cancer cells realize their proliferation and metastasis activities based on the special redox adaptation to increased reactive oxygen species (ROS) level, which inversely makes them sensitive to external interference with their redox state. In view of this, in recent decades, researchers have made great efforts to construct a series of novel nanoplatform-based ROS-mediated cancer therapies through increasing ROS generation and inhibiting the ROS elimination. Besides, the multidrug resistance and thermoresistance of tumor are closely related to tumor redox state. Recently, numerous works have shown that ROS regulation in cancer cells can intervene in the expression, function and stability of related proteins to achieve reversal of tumor resistance. In this review, the recent researches about ROS-regulating nanoagents on cancer therapy and tumor resistance alleviation have been well summarized. Finally, the challenges and research directions of ROS-regulating nanoagents for future clinical translation are also discussed.
Herein, we report an efficient photochemical method for the synthesis of poly-substituted pyrazoles through a multicomponent reaction of acceptor-only diazoalkanes, alkynes, and solvents (cyclic ethers or nitriles). The key to this success was driven by the photolysis of acceptor-only diazoalkanes to form free carbene species and the fast in situ [3 + 2]-cycloaddition formation of nucleophilic NH pyrazole derivatives. This work also serves as an entry to allow future reaction design on the combination of carbene reactivity of diazoalkanes with their other reaction modes.
Photothermal therapy (PTT) induces thermoresistance through cellular heat shock response, which impairs the therapeutic efficacy of the PTT. To resolve this problem, we developed a photothermal theranostics (denoted as PMH), which integrated the photothermal conversion agent of PdMo bimetallene with histone deacetylase 6 (HDAC6) selected inhibitor (ACY-1215), showing the synergistic antitumor effect both in vitro and in vivo. Mechanistically, under the photoacoustic imaging (PA) navigation, the released ACY-1215 triggered by NIR laser irradiation decrease the heat shock proteins (HSPs) expression and weaken the HDAC6-regulated HSP90 deacetylation, thus hindering the degradation of PTT-induced misfolded or unfold proteins through proteasome dependent pathway. Moreover, mild photothermal therapy (mPTT) treatment compromised the autophagy, which induced by HDAC6 inhibition, leading to mPTT-induced misfolded or unfold proteins further accumulation. Given that inhibition of HDAC6 plus mPTT contribute to tumor eradication. This study develops a promising combination strategy based on mPTT for future cancer treatment.
Furocoumarins are an important class of heterocyclic compounds with a fused tricyclic structure of coumarin and furan rings. They are commonly found in bioactive natural products and have a diverse range of biological and pharmaceutical properties, including cytotoxicity, photosensitivity, insecticidal, antibacterial, and antifungal activity, among others. The elegant linear/angular tricyclic skeleton and superior pharmacological properties, make them ideal for building and developing advanced biological scaffolds for biomedical applications. As a result, the family of furocoumarins has been the focus of intensive research, and lots of encouraging progress have been achieved in recent years. This review summarizes the most recent methods reported for the synthesis of the furocoumarin derivative family, along with their applications in medicinal chemistry covering from 2018 to 2022.
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