RESUMEN
Recent innovations in nanomaterials inspire abundant novel tumor-targeting CRISPR-based gene therapies. However, the therapeutic efficiency of traditional targeted nanotherapeutic strategies is limited by that the biomarkers vary in a spatiotemporal-dependent manner with tumor progression. Here, we propose a self-amplifying logic-gated gene editing strategy for gene/H2O2-mediated/starvation multimodal cancer therapy. In this approach, a hypoxia-degradable covalent-organic framework (COF) is synthesized to coat a-ZIF-8 in which glucose oxidase (GOx) and CRISPR system are packaged. To intensify intracellular redox dyshomeostasis, DNAzymes which can cleave catalase mRNA are loaded as well. When the nanosystem gets into the tumor, the weakly acidic and hypoxic microenvironment degrades the ZIF-8@COF to activate GOx, which amplifies intracellular H+ and hypoxia, accelerating the nanocarrier degradation to guarantee available CRISPR plasmid and GOx release in target cells. These tandem reactions deplete glucose and oxygen, leading to logic-gated-triggered gene editing as well as synergistic gene/H2O2-mediated/starvation therapy. Overall, this approach highlights the biocomputing-based CRISPR delivery and underscores the great potential of precise cancer therapy.
RESUMEN
Objective To observe the value of epiglottis and sternohyoid myofascial flap in laryngeal function reconstruction after partial laryngectomy.Methods Seven cases of subtotal laryngectomy were reviewed for analysis.The choice of surgical procedure was decided on pathologic conditions,the laryngeal function was reconstructed using epiglottis and sternohyoid myofascial flap.Results All patients rehabilitated deglutition in 10 to 12 days after surgery.None presented complication of aspiration.Conclusion The epiglottis and sternohyoid myofascial flaps are appropriate for reconstruction of surgical defect in laryngeal carcinoma.