The development of silk fibroin hydrogels with a suitable gelation rate and mechanical strength, as well as multifunctional properties including injectability, antibacterial activity, and adhesiveness, is of importance for wound healing and skin infection treatment, yet their design remains challenging. Herein, a multifunctional hydrogel from silk fibroin and tannic acid is developed, relying on the favorable interactions between them. The hybrid hydrogel (SF-TA) exhibits numerous advantages, such as short gelation time, low gelation concentrations, good adhesiveness, and shear-thinning and self-recovery properties. Moreover, the incorporation of tannic acid endows the hybrid hydrogel with remarkable bioactivity, including antimicrobial and antioxidant activities, beneficial to improving wound healing. In vivo experiments verify that the designed hybrid hydrogel can significantly accelerate the wound healing process in a full-thickness skin defect model on mice.

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Background: Glioblastoma (GBM) is a subclass of brain malignancy with unsatisfactory prognosis. MicroRNAs (miR-NAs) are a group of non-coding RNAs (ncRNAs) that exert key function on tumorigenesis and tumor development. Purposes: The purpose of this work was to unravel the biological behavior and mechanism of miR-1204 in GBM. Methods: Expressions of miR-1204, NR3C2 and CREB1 were detected by RT-qPCR and western blot. Proliferation and apoptosis of GBM cells were detected by CCK-8, colony formation, caspase-3 activity and TUNEL assays. Molecular interplays were examined by ChIP, RIP, and luciferase reporter assays. Results: MiR-1204 level was elevated in GBM cell lines. Functionally, miR-1204 aggravated cell proliferation whereas suppressed cell apoptosis in GBM cells. Mechanistically, cAMP Responsive Element Binding Protein 1 (CREB1) bound to the promoter of miR-1204 and activated the transcription of miR-1204. Furthermore, miR-1204 targeted and inhibited Nuclear receptor subfamily 3 group C member 2 (NR3C2), a tumor suppressor gene in GBM cells. Rescue assays indicated that NR3C2 participated in the regulation of miR-1204 on the malignant phenotype of GBM cells. Conclusions: We observed for the first time that CREB1-induced miR-1204 promoted malignant phenotype of GBM through targeting NR3C2, indicating that miR-1204 acted as a novel oncogenic miRNA in GBM.

Multivalent carbohydrate–lectin interactions play a crucial role in bacterial infection. Biomimicry of multivalent glycosystems represents a major strategy in the repression of bacterial growth. In this study, a new kind of glycopeptide (Naphthyl‐Phe‐Phe‐Ser‐Tyr, NMY) scaffold with mannose modification is designed and synthesized, which is able to perform supramolecular self‐assembly with the assistance of catalytic enzyme, and present multiple mannose ligands on its self‐assembled structure to target mannose‐binding proteins. Relying on multivalent carbohydrate–lectin interactions, the glycopeptide hydrogel is able to bind Escherichia coli (E. coli) in high specificity, and result in bacterial adhesion, membrane disruption and subsequent cell death. In vivo wound healing assays reveal that this glycopeptide hydrogel exhibits considerable potentials for promoting wound healing and preventing E. coli infection in a full‐thickness skin defect mouse model. Therefore, through a specific mannose–lectin interaction, a biocompatible hydrogel with inherent antibacterial activity against E. coli is achieved without the need to resort to antibiotic or antimicrobial agent treatment, highlighting the potential role of sugar‐coated nanomaterials in wound healing and control of bacterial pathogenesis.