Total flavonoid of Litsea coreana leve exerts anti-oxidative effects and alleviates focal cerebral ischemia/reperfusion injury

In this study, we hypothesized that total flavonoid of Litsea coreana leve （TFLC） protects against focal cerebral ischemia/reperfusion injury. TFLC （25, 50, 100 mg/kg） was administered orally to a rat model of focal ischemia/reperfusion injury, while the free radical scavenging agent, edaravone, was used as a positive control drug. Results of neurological deficit scoring, 2,3,5-triphenyl tetrazolium chloride staining, hematoxylin-eosin staining and biochemical tests showed that TFLC at different doses significantly alleviated cerebral ischemia-induced neurological deficits and histopathological changes, and reduced infarct volume. Moreover, it suppressed the increase in the levels of nitrates plus nitrites, malondialdehyde and lactate dehydrogenase, and it diminished the reduction in glu- tathione, superoxide dismutase and catalase activities induced by cerebral ischemia/reperfusion injury. Compared with edaravone, the protective effects of TFLC at low and medium doses （25, 50 mg/kg） against cerebral ischemia/reperfusion injury were weaker, while the protective effects at high dose （100 mg/kg） were similar. Our experimental findings suggest that TFLC exerts neuroprotective effects against focal cerebral ischemia/reperfusion injury in rats, and that the effects may be asso- ciated with its antioxidant activities.

Construction of defect-containing UiO-66/MoSe_(2) heterojunctions with superior photocatalytic performance for wastewater treatment and mechanism insight

Metal-organic frameworks are recognized as promising multifunctional materials,especially metal-organic framework-based photocatalysts,which are considered to be ideal photocatalytic materials.Herein,a new type of UiO-66/MoSe_(2) composite was prepared using the solvothermal method.The optimum composite was selected by adjusting the mass ratio of UiO-66 and MoSe_(2).X-ray diffraction analysis showed that the mass ratio influenced the crystal plane exposure rate of the composite,which may have affected its photocatalytic performance.The composite is composed of ultra-thin flower-like MoSe_(2) that wrapped around cubic UiO-66,a structure that increases the abundance of active sites for reactions and is more conducive to the separation of carriers.The photocatalytic properties of the composite were evaluated by measuring the degradation rate of Rhodamine B and the catalyst’s ability to reduce Cr(VI)-containing wastewater under visible light irradiation.Rhodamine B was decolorized completely in 120 min,and most of the Cr(VI)was reduced within 150 min.The photochemical mechanism of the complex was studied in detail.The existence of Mo^(6+)and oxygen vacancies,in addition to the Z-type heterojunction promote the separation of electrons and holes,which enhances the photocatalytic effect.

Hyperbranched magnetic polymer:highly efficient removal of Cr(Ⅵ)and application in electroplating wastewater

By using a two-step hydrothermal method and trithiocyanuric acid(TTCA),2,4,6-trihydrazino-1,3,5-triazine(THT),and Fe_(3)O_(4)as raw materials,a spherical magnetic adsorbent polymer(TTCA/THT@Fe_(3)O_(4))was synthesized to achieve the efficient removal of Cr(VI)from wastewater.Under optimal adsorption conditions,the maximum adsorption capacity of TTCA/THT@Fe_(3)O_(4)for Cr(VI)can reach 1340 mg∙g‒1.Notably,the removal efficiency can approach 98.9%,even at the lower concentration of 20 mg∙L^(‒1)Cr(VI).For actual wastewater containing Cr(VI),the Cr(VI)concentration was reduced from 25.8 to 0.4 mg∙L^(‒1),a remarkable 20%lower than the current industry discharge standard value.A mechanism for the high adsorption performance of Cr(VI)on TTCA/THT@Fe_(3)O_(4)was investigated using Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,and density functional theory.It can be plausibly attributed to the formation of Cr/N and Cr/S coordination bonds.Additionally,surface electrostatic adsorption,reduction effects,and the spherical polymer structure increase the contact area with Cr(VI),maximizing adsorption.The synergistic effect of adsorption and reduction enhances the adsorption performance of TTCA/THT@Fe_(3)O_(4)for Cr(VI)and total chromium in water.The resultant polymer has a simple preparation process,excellent adsorption performance,easy magnetic separation,and promising application for actual wastewater.

In situ preparation of g-C_(3)N_(4)/polyaniline hybrid composites with enhanced visible-light photocatalytic performance

The graphic carbon nitride/polyaniline(g-C_(3)N_(4)/PANI)hybrid composites were successfully synthesized by a facile in situ polymerization process under ice water bath.The photocatalytic activities of the g-C_(3)N_(4)/PANI composites were evaluated by using oxytetracycline(OTC)as model pollutants.The optimal g-C_(3)N_(4)/PANI composite(5%PANI:the g-C_(3)N_(4)/PANI hybrid with 5 wt.%of PANI)showed an enhancement degradation rate of 5-fold compared to that of conventional g-C_(3)N_(4)under simulated-sunlight irradiation.In addition,the 5%PANI demonstrate significantly photocatalytic evolution H_(2)rate(163.2μmol/(g·hr))under the visible light irradiation.Furthermore,based on the results of optical performance and electrochemical testing,a possible mechanism was proposed,indicating that the incorporation of PANI into the traditional g-C_(3)N_(4)can effectively tune the electronic structures,improve the photo-generated electrons-holes separation and enhance extensive absorption of visible light.Such a g-C_(3)N_(4)/PANI hybrid nanocomposites could be envisaged to possess great potentials in practical wastewater treatment and water splitting.

Circular BANP knockdown inhibits the malignant progression of residual hepatocellular carcinoma after insufficient radiofrequency ablation

Background:Circular RNAs(circRNAs)are endogenous non-coding RNAs,some of which have pathological roles.The current study aimed to explore the role of circRNA BTG3-associated nuclear protein(circ-BANP)binding with let-7f-5p and its regulation of the toll-like receptor 4(TLR4)/signal transducer and activator of transcription 3(STAT3)signaling pathway in residual hepatocellular carcinoma(HCC)after insufficient radiofrequency ablation(RFA).Methods:Circ-BANP,let-7f-5p,and TLR4 expressions in HCC samples were assessed using reverse transcription-quantitative polymerase chain reaction(RT-qPCR)and Western blotting.Bioinformatics prediction,RNA pull-down assay,and dual luciferase reporter gene assay were used to analyze the relationships among circ-BANP,let-7f-5p,and TLR4.Huh7 cells were used to generate an in vitro model of residual HCC,defined as Huh7-H cells,which were transfected with either a plasmid or the sequence of circ-BANP,let-7f-5p,or TLR4.Expression of circ-BANP,let-7f-5p,and TLR4 mRNA was determined by RT-qPCR.TLR4,STAT3,p-STAT3,vascular endothelial growth factor A,vascular endothelial growth factor receptor-2,and epithelialmesenchymal transformation(EMT)-related factors proteins were determined by Western blotting.Cell proliferation was determined by cell counting kit-8 and 5-Ethynyl-2’-deoxyuridine(EdU)assay and cell migration and invasion by Transwell assay.Animal studies were performed by inducing xenograft tumors in nude mice.Results:Circ-BANP and TLR4 mRNAs were upregulated in HCC tissues(the fold change for circ-BANP was 1.958 and that for TLR4 was 1.736 relative to para-tumors)and expression further increased following insufficient RFA(fold change for circBANP was 2.407 and that of TLR4 was 2.224 relative to para-tumors).Expression of let-7f-5p showed an opposite tendency(fold change for let-7f-5p in HCC tissues was 0.491 and that in tumors after insufficient RFA was 0.300 relative to paratumors).Competitive binding of circ-BANP to let-7f-5p was demonstrated and TLR4 was identified as a target of let-7f-5p(P<0.01).Knockdown of circ-BANP or elevation of let-7f-5p expression inhibited the TLR4/STAT3 signaling pathway,proliferation,invasion,migration,angiogenesis,and EMT in Huh7 and Huh7-H cells(P<0.01).The effects induced by circBANP knockdown were reversed by let-7f-5p inhibition.Overexpression of TLR4 reversed the impact of let-7f-5p upregulation on the cells(P<0.01).Silencing of circ-BANP inhibited the in vivo growth of residual HCC cells after insufficient RFA(P<0.01).Conclusions:Knockdown of circ-BANP upregulated let-7f-5p to inhibit proliferation,migration,and EMT formation in residual HCC remaining after insufficient RFA.Effects occur via regulation of the TLR4/STAT3 signaling pathway.