Inhibition of biofilm formation of periodontal pathogens by D-Arabinose

Periodontitis and periimplantitis are caused as a result of dental biofilm formation. This biofilm is composed of multiple species of pathogens. Therefore, controlling biofilm formation is critical for disease prevention. To inhibit biofilm formation, sugars can be used to interrupt lectin-involving interactions between bacteria or between bacteria and a host. In this study, we evaluated the effect of D-Arabinose on biofilm formation of putative periodontal pathogens as well as the quorum sensing activity and whole protein profiles of the pathogens. Crystal violet staining, confocal laser scanning microscopy, and scanning electron microscopy revealed that D-Arabinose inhibited biofilm formation of Porphyromonas gingivalis, Fusobacterium nucleatum, and Tannerella forsythia. D-Arabinose also significantly inhibited the activity of autoinducer 2 of F. nucleatum and the expression of representative bacterial virulence genes.Furthermore, D-Arabinose treatment altered the expression of some bacterial proteins. These results demonstrate that D-Arabinose can be used as an antibiofilm agent for the prevention of periodontal infections.

Inhibition of biofilm formation of periodontal pathogens by D-Arabinose

Periodontitis and periimplantitis are caused as a result of dental biofilm formation. This biofilm is composed of multiple species of pathogens. Therefore, controlling biofilm formation is critical for disease prevention. To inhibit biofilm formation, sugars can be used to interrupt lectin-involving interactions between bacteria or between bacteria and a host. In this study, we evaluated the effect of D-Arabinose on biofilm formation of putative periodontal pathogens as well as the quorum sensing activity and whole protein profiles of the pathogens. Crystal violet staining, confocal laser scanning microscopy, and scanning electron microscopy revealed that D-Arabinose inhibited biofilm formation of Porphyromonas gingivalis, Fusobacterium nucleatum, and Tannerella forsythia. D-Arabinose also significantly inhibited the activity of autoinducer 2 of F. nucleatum and the expression of representative bacterial virulence genes.Furthermore, D-Arabinose treatment altered the expression of some bacterial proteins. These results demonstrate that D-Arabinose can be used as an antibiofilm agent for the prevention of periodontal infections.

Bronchopulmonary Sequestration with Dual Arterial Supply from Celiac Artery and Thoracic Aorta / 결핵및호흡기질환

Bronchopulmonary sequestration (BPS) is a rare congenital malformation of the lower respiratory tract. Most intralobar BPSs are provided with an arterial blood via the thoracic or abdominal aorta but such a supply is rarely found in patients older than 50 years. We report a case of an intralobar BPS with a dual arterial supply from the celiac artery and thoracic aorta in a 50-year-old man presenting with a respiratory tract infection and haemoptysis. To our knowledge, this is the first case report of a BPS supplied by the celiac artery and thoracic aorta in a 50-year-old man.

Two Cases of Postintubation Tracheoesophageal Fistula in Patients with a History of Tracheostomy: Case Report / 대한구급학회지

Common causes of acquired tracheoesophageal (T-E) fistula are blunt trauma on the neck or chest, malignancy, long-term mechanical ventilation, and post-intubation injury. Most of the cases are fatal due to severe respiratory infection. We experienced two cases of post-intubation T-E fistula in patients with a history of tracheostomy that developed earlier than usual. One case was caused by excessive cuff pressure and the other by avulsion injury during endotracheal intubation. We can get instructions from these cases that how to prevent T-E fistula because it is hard to treat and causes severe outcomes.

Immunohistochemical Studies of Fascin, MMP-9 Overexpression, and Proliferating Index as Prognostic Factors in Cases of a Colon Adenocarcinoma

PURPOSE: The malignant conversion of epithelial cells involves alterations in the expression and the function of cell-matrix and cell-cell adhesive systems that enable a switch to a migratory phenotype in tumor invasion and metastasis. Here, the author studies the prevalence and the potential clinical significance of fascin and Matrix metalloproteinase-9 (MMP-9) expression in relation to the progression of colon adenocarcinoma and of tumor cell proliferation as measured by using the topoisomerase II-alpha (Topo II-alpha) index. METHODS: Relatively well-preserved paraffin-embedded tissues of 120 cases of colon adenocarcinomas were immunohistochemically stained for fascin, MMP-9, and Topo II-alpha expression. A reaction was determined as being positive when more than 10% of the cells were positive for fascin, and/or MMP-9. The Topo II-alpha index is defined as the positive number of tumor cells divided by the total number of tumor cells counted times 100. At least 1,000 cells were counted for this analysis. A chi-square test, by using Epi info 2000, for Fascin and/or MMP-9 and a two-sided test for the Topo II-alpha index were employed with a significance of P65 yr, P=0.028), tumor grading (P=0.009), and lymph node metastases (P=0.005). However, MMP-9 immunoreactivity was not statistically associated with age, gender, tumor stage, or lymph node metastases. Fascin expression was statistically associated with MMP-9 expression, especially for left colon adenocarcinomas (P=0.0032). Although the topo II-alpha proliferating index was associated with lymph node metastasis (P<0.01), this result was not statistically associated with Fascin or MMP-9 expression. CONCLUSION: Fascin expression may be closely linked with tumor grading and lymph node metastasis of more aggressive colon adenocarcinomas and partly associated with MMP-9 expression in tumor invasion. However, further studies of fascin expression as an independent prognostic factor are required for the determination of significant relationships with other clinicopathologic indices.

Immunohistochemical Study of C-erbB-2 and VEGF Expression in Non-Small Cell Lung Cancer / 결핵및호흡기질환

BACKGROUND: Mutated or deregulated expression of C-erbB-2 causes this gene to function as a potent oncogene. Vascular endothelial growth factor (VEGF) is a crucial angiogenic molecule in lung cancer. Both C-erbB-2 and VEGF can promote growth, proliferation and metastasis in non-small cell lung cancer (NSCLC). The purpose of this study was to investigate evaluate the relationship between the expressions of the C-erbB-2 and VEGF genes using immunohistochemistry. MATERIALS AND METHODS: Ninety-five patients with NSCLC were involved (60 squamous cell carcinoma and 35 adenocarcinoma). The formalin-fixed paraffin embedded specimens were immunohistochemically stained for C-erbB-2 and VEGF using the avidin-biotin complex method. RESULTS: Positive C-erbB-2 expression was observed more often in adenocarcinomas than squamous cell carcinomas (p<0.05). Although the immunohistochemical expressions of C-erbB-2 and VEGF in non-small-cell lung cancer showed increased tendencies at an advanced stage, the correlation between early and advanced cancers was insignificant. In adenocarcinomas, the expressions of VEGF and C-erbB-2 were significantly (p<0.05). CONCLUSION: The overexpression fo C-erbB-2 was significantly higher in adenocarcinomas than squamous cell carcinomas, and correlated with the expression of VEGF in adenocarcinomas of the lungs.