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Biodegradable Janus sonozyme with continuous reactive oxygen species regulation for treating infected critical-sized bone defects

ABSTRACT: Biodegradable Janus sonozyme with continuous reactive oxygen species regulation for treating infected critical-sized bone defects

PROVIDER: PRJNA1170985 | ENA |

REPOSITORIES: ENA

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			Action	DRS
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	SRR30938140_1.fastq.gz	Fastqsanger.gz
	SRR30938140_2.fastq.gz	Fastqsanger.gz
	SRR30938141_1.fastq.gz	Fastqsanger.gz
	SRR30938141_2.fastq.gz	Fastqsanger.gz

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Biodegradable Janus sonozyme with continuous reactive oxygen species regulation for treating infected critical-sized bone defects

Project description:Critical-sized bone defects are usually accompanied by bacterial infection leading to inflammation and bone nonunion. However, existing biodegradable materials lack long-term therapeutical effect because of their gradual degradation. Here, a degradable material with all time ROS modulation is proposed, defined as a sonozyme due to its functions as a sonosensitizer and a nanoenzyme. Before degradation, the sonozyme can exert an effective sonodynamic antimicrobial effect through the dual active sites of MnN4 and Cu2O8. Furthermore, it can promote anti-inflammation by superoxide dismutase and catalase activities. Following degradation, quercetin-metal chelation exhibits a sustaining antioxidant effect through ligand-metal charge transfer, while the released ions and quercetin also have great self-antimicrobial, osteogenic, and angiogenic effects. A rat model of infected cranial defects demonstrates the sonozyme can rapidly eliminate bacteria and promote bone regeneration. This work presents a promising approach to engineer biodegradable materials with long-time effects for infectious bone defects.

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Project description:MicroRNAs (miRNAs) are important regulators of gene expression. Their levels are precisely controlled through modulating the activity of the microprocesser complex (MC). Here we report that JANUS, a homology of the conserved U2 snRNP assembly factor in yeast and human, is required for miRNA accumulation. JANUS associates with MC components Dicer-like 1 and SERRATE (SE) and directly binds the stem-loop of pri-miRNAs. In a hypomorphic janus mutant, the activity of DCL1, the numbers of MC, and the interaction of primary miRNA transcript (pri-miRNAs) with MC are reduced. These data suggest that JANUS promotes the assembly and activity of MC through its interaction with MC and/or pri-miRNAs. In addition, JANUS modulates the transcription of some pri-miRNAs as it binds the promoter of pri-miRNAs and promotes Pol II occupancy of at their promoters. Moreover, global splicing defects are detected in janus. Taken together, our study reveals a novel role of a conserved splicing factor in miRNA biogenesis.

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Janus nanoparticles targeting extracellular polymeric substance achieve flexible elimination of drug-resistant biofilms

Project description:Safe and efficient antibacterial materials are urgently needed to combat drug-resistant bacteria and biofilm-associated infections. The rational design of nanoparticles for flexible elimination of biofilms by alternative strategies remains challenging. Herein, we propose the fabrication of Janus-structured nanoparticles targeting extracellular polymeric substance to achieve dispersion or near-infrared (NIR) light-activated photothermal elimination of drug-resistant biofilms, respectively. Asymmetrical Janus-structured dextran-bismuth selenide (Dex-BSe) nanoparticles are fabricated by a facile strategy to exploit synergistic effects of both components. The biocompatible dextran domain with the maximum exposure endows the Janus nanoparticles with biofilm penetration, targeting, and dispersion functions. Interestingly, Janus Dex-BSe nanoparticles realize enhanced dispersal of biofilms over time compared with dextran nanoparticles while the underlying molecular mechanisms are further revealed by RNA-sequencing transcriptomics analysis. Alternatively, taking advantage of the preferential accumulation of nanoparticles at infection sites, the self-propelled active motion induced by the unique Janus structure enhances the photothermal killing effect under NIR light irradiation, thereby eradicating the biofilm. Given these favorable features, the antibiofilm activity of Janus Dex-BSe against methicillin-resistant Staphylococcus aureus (MRSA) was first validated in vitro. More importantly, the flexible application of Janus Dex-BSe nanoparticles for biofilm removal or NIR-triggered eradication in vivo was demonstrated by MRSA-infected mouse excisional wound model and abscess model, respectively. The currently developed Janus nanoplatform holds great promise for the efficient elimination of drug-resistant biofilms in diverse antibacterial scenarios.

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