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1.
Soft Matter ; 17(40): 9040-9046, 2021 Oct 20.
Artigo em Inglês | MEDLINE | ID: mdl-34569588

RESUMO

In previous studies, the increasing alkyl length of liquid crystalline molecules enhanced the chiral transfer and resulted in better CPL performance. But no work concerned the influence of alkyl lengths on CPL properties for non-liquid crystalline systems. In this research, three R-binaphthol-based cyanostilbene derivatives with various alkyl chains (BC-5, BC-8 and BC-12) were prepared in yields of 60-69%. They did not exhibit liquid crystalline behavior but were seen as soft materials at room temperature. They displayed excellent AIE fluorescence in aggregated states. Chiroptical investigations suggested good CD and CPL properties for their cyanostilbene units, indicating the successful chiral transfer from the binaphthol moieties to cyanostilbene units. Moreover, the values of gabs for CD signals and glum for CPL signals displayed the changing order of BC-5 > BC-8 > BC-12. These results suggested that the shorter alkyl chains for non-liquid crystalline systems led to stronger CPL emission, which was opposite to the results of the liquid crystalline molecules. This work provided a new strategy for the design and synthesis of chiroptical materials with good CPL properties based on non-liquid crystalline molecules.

2.
Int J Med Sci ; 18(15): 3533-3543, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34522180

RESUMO

Importance: Despite the availability of a vaccine against the severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2), humans will have to live with this virus and the after-effects of the coronavirus disease 2019 (COVID-19) infection for a long time. Cholesterol plays an important role in the infection and prognosis of SARS-CoV-2, and the study of its mechanism is of great significance not only for the treatment of COVID-19 but also for research on generic antiviral drugs. Observations: Cholesterol promotes the development of atherosclerosis by activating NLR family pyrin domain containing 3 (NLRP3), and the resulting inflammatory environment indirectly contributes to COVID-19 infection and subsequent deterioration. In in vitro studies, membrane cholesterol increased the number of viral entry sites on the host cell membrane and the number of angiotensin-converting enzyme 2 (ACE2) receptors in the membrane fusion site. Previous studies have shown that the fusion protein of the virus interacts with cholesterol, and the spike protein of SARS-CoV-2 also requires cholesterol to enter the host cells. Cholesterol in blood interacts with the spike protein to promote the entry of spike cells, wherein the scavenger receptor class B type 1 (SR-B1) plays an important role. Because of the cardiovascular protective effects of lipid-lowering therapy and the additional anti-inflammatory effects of lipid-lowering drugs, it is currently recommended to continue lipid-lowering therapy for patients with COVID-19, but the safety of extremely low LDL-C is questionable. Conclusions and Relevance: Cholesterol can indirectly increase the susceptibility of patients to SARS-CoV-2 and increase the risk of death from COVID-19, which are mediated by NLRP3 and atherosclerotic plaques, respectively. Cholesterol present in the host cell membrane, virus, and blood may also directly participate in the virus cell entry process, but the specific mechanism still needs further study. Patients with COVID-19 are recommended to continue lipid-lowering therapy.


Assuntos
COVID-19/complicações , Hipercolesterolemia/complicações , Enzima de Conversão de Angiotensina 2/metabolismo , Antivirais/uso terapêutico , Aterosclerose/fisiopatologia , COVID-19/diagnóstico , COVID-19/tratamento farmacológico , COVID-19/terapia , Membrana Celular/metabolismo , HDL-Colesterol/metabolismo , LDL-Colesterol/metabolismo , Endocitose , Humanos , Hipercolesterolemia/diagnóstico , Hipercolesterolemia/terapia , Inflamação , Macrófagos/metabolismo , Proteína 3 que Contém Domínio de Pirina da Família NLR/sangue , Prognóstico , SARS-CoV-2 , Receptores Depuradores Classe B/metabolismo
3.
Adv Healthc Mater ; 9(1): e1900948, 2020 01.
Artigo em Inglês | MEDLINE | ID: mdl-31746549

RESUMO

Prussian blue nanoprobes are widely studied and applied in tumor photothermal therapy (PTT) and magnetic resonance imaging (MRI), due to their low toxicity and excellent in vivo performance. However, the sizes of hitherto reported Prussian blue nanoprobes are generally larger than 50 nm, which greatly influence cell phagocytosis, in vivo circulation, and biodistribution. In this work, a novel method of doping zinc ions is used to control the size of Prussian blue nanoprobes. Consequently, the performances of the nanoprobes in PTT and MRI are both significantly improved. The results show that the minimum size of Prussian blue nanoprobes achieved by doping 10% zinc ions (abbreviated as SPBZn(10%)) is 3.8 ± 0.90 nm, and the maximum specific absorption coefficient, photothermal conversion efficiency, and longitudinal relaxation rates are 1.78 L g-1 cm-1 , 47.33%, and 18.40 mm-1 s-1 , respectively. In addition, the SPBZn(10%) nanoprobes provide excellent PTT efficacy on 4T1 tumor cells (killing rate: 90.3%) and breast cancer model (tumor inhibition rate: 69.4%). Toxicological experiment results show that the SPBZn(n%) nanoprobes exhibit no obvious in vitro cytotoxicity and they can be used safely in mice at doses below 100 mg kg-1 . Therefore, SPBZn(10%) nanoprobes can potentially be used for effective cancer theranostics.


Assuntos
Neoplasias da Mama/terapia , Ferrocianetos/química , Nanoestruturas/química , Fármacos Fotossensibilizantes/química , Terapia Fototérmica/métodos , Zinco/química , Animais , Neoplasias da Mama/diagnóstico por imagem , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Feminino , Humanos , Hipertermia Induzida , Raios Infravermelhos , Imageamento por Ressonância Magnética , Camundongos , Camundongos Endogâmicos BALB C , Tamanho da Partícula , Fármacos Fotossensibilizantes/metabolismo , Fármacos Fotossensibilizantes/farmacologia , Fármacos Fotossensibilizantes/uso terapêutico , Nanomedicina Teranóstica , Distribuição Tecidual , Ensaios Antitumorais Modelo de Xenoenxerto
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