Role of long non-coding RNA in chemoradiotherapy resistance of nasopharyngeal carcinoma.

Nasopharyngeal carcinoma (NPC) is a malignant tumor originating from the nasopharyngeal epithelial cells. Common treatment methods for NPC include radiotherapy, chemotherapy, and surgical intervention. Despite these approaches, the prognosis for NPC remains poor due to treatment resistance and recurrence. Hence, there is a crucial need for more comprehensive research into the mechanisms underlying treatment resistance in NPC. Long non coding RNAs (LncRNAs) are elongated RNA molecules that do not encode proteins. They paly significant roles in various biological processes within tumors, such as chemotherapy resistance, radiation resistance, and tumor recurrence. Recent studies have increasingly unveiled the mechanisms through which LncRNAs contribute to treatment resistance in NPC. Consequently, LncRNAs hold promise as potential biomarkers and therapeutic targets for diagnosing NPC. This review provides an overview of the role of LncRNAs in NPC treatment resistance and explores their potential as therapeutic targets for managing NPC.

Nasopharyngeal tuberculosis: A case report.

Nasopharyngeal tuberculosis is a rare disease. Even in areas where tuberculosis is endemic, its incidence is also extremely low. Here, we will report a rare case of nasopharyngeal tuberculosis. A 29-year-old male patient presented with a 2-month history of sore throat, nasal congestion, dysphagia, and low-grade fever. Thickened mucosa in the posterior wall of the nasopharynx was shown from nasopharyngoscopy, covered with a thick, yellowish, purulent secretion that was not easily removed. Computed tomography of the nasopharynx showed thickening of the mucosa in the right and left bilateral walls and the posterior wall with indistinct margins. Histopathological examination diagnosed nasopharyngeal tuberculosis granuloma. Nasopharyngeal tuberculosis is rare and has atypical symptoms. When a new organism appears in the nasopharynx, it should be differentiated from tuberculosis, autoimmune diseases, and tumors, and a tissue biopsy of the new organism should be performed to make a final diagnosis based on histopathology.

Chitosan/Diatom-Biosilica Aerogel with Controlled Porous Structure for Rapid Hemostasis.

Uncontrolled hemorrhage is the main reason of possible preventable death after accidental injury. It is necessary to develop a hemostatic agent with rapid hemostatic performance and good biocompatibility. In this study, a chitosan/diatom-biosilica-based aerogel is developed using dopamine as cross-linker by simple alkaline precipitation and tert-butyl alcohol replacement. The chitosan/diatom-biosilica aerogel exhibits favorable biocompatibility and multiscale hierarchical porous structure (from nanometer to micrometer), which can be controlled by the concentration of tert-butyl alcohol. The displacement of tert-butyl alcohol can keep the porosity of diatom-biosilica in aerogel and give it large surface with efficient water absorption ratio. 30% tert-butyl alcohol replacement of aerogel possesses the largest surface area (74.441 m2 g-1 ), water absorption capacity (316.83 ± 2.04%), and excellent hemostatic performance in vitro blood coagulation (≈70 s). Furthermore, this aerogel exhibits the shortest clotting time and lowest blood loss in rat hemorrhage model. The strong interface effect between aerogel and blood is able to promote erythrocytes aggregation, platelets adhesion, and activation, as well as, activate the intrinsic coagulation pathway to accelerate blood coagulation. All the above results demonstrate that chitosan/diatom-biosilica aerogel has great potential to be a safe and rapid hemostatic material.

[Analysis of bleeding cause after uvulopalatopharyngoplasty with endotherm knife].

OBJECTIVE: To summary and analyze the bleeding causes after uvulopalatopharyngoplasty(UPPP) with endotherm knife, and preventive measures will be given to effectively reduce postoperation hemorrhage. METHOD: Two hundred and twenty-six cases of obstructive sleep apnea hypopnea syndrome (OSAHS) adult patients, were carryed out UPPP under general anesthesia with endotherm knife to observe postoperation hemorrhage. RESULT: Eight cases out of 226 patients or 3.5% occurred postoperation hemorrhage, 2 cases after 1 or 2 days, 6 cases after 6 or 12 days. The postoperation hemorrhage stopped by local compression hemostasis or bi-polar coagulation hemostasis, and no more bleeding occurred. CONCLUSION: The minimal trauma, quick operation and less-bleeding will be caused by UPPP with endotherm knife. Few patients 3.5% had a small amount of bleeding after operation, but no serious bleeding occured. Hemorrhage often happened during pseud mucosa falling off period. The bleeding was related with using skill of endotherm knife during operation, postoperation pse-ud mucosa falling off, local inflammation, improper eating and emotional stress of patients.

Purification, characterization, and action mode of a chitosanase from Streptomyces roseolus induced by chitin.

Chitosanase (EC3.2.1.132) catalyzes the hydrolysis of ß-1,4-glycosidic bonds in chitosan, converting it into chitooligosaccharides, which exhibit versatile application potentials in food, pharmaceutical, and agricultural areas. In this paper we present a new inducible chitosanase, isolated, and purified from a bacterial culture medium of Streptomyces roseolus DH by precipitation with ammonium sulfate and combined column chromatographies. The SDS-PAGE results show its molecular mass is around 41 kDa, with a purity of more than 95%. The purified chitosanase exhibits optimum activity at 50°C, pH 5.0. It is stable between 30 and 60°C and at pH values between 5 and 7. It shows the highest activity towards colloidal chitosan and breaks down glycol chitosan and glycol chitin weakly. The enzyme is significantly inhibited by Cu(2+), Co(2+), Mn(2+), Zn(2+), and EDTA, but slightly activated by Mg(2+). Further action mode analysis based on chitosan oligomers and a polymer reveals that the chitosanase could split chitooligosaccharides with degree of polymerization (DP) >4 and chitosan in an endolytic manner. The resultant hydrolytes are mainly chitotrisaccharides, indicating it is suitable for the uniform bioconversion of chitosan and its derivatives with high efficiency.