Identification and characterization of a salivary-pellicle-binding peptide by phage display

Objective

Dental biofilms are associated with oral diseases, making their control necessary. One way to control them is to prevent initial bacterial adherence to the salivary pellicle and thereby eventually decrease binding of late colonizing potential pathogens. The goal of this study was to generate a salivary-pellicle-binding peptide (SPBP) with antifouling activity towards primary colonizing bacteria. In order to achieve this goal we aimed to: (i) identify novel SPBPs by phage display; (ii) characterize the binding and antifouling properties of the selected SPBPs.

Methods

A library of 2 × 10⁹ phages displaying a random sequence of 12-mer peptides was used to identify peptides that bound selectively to the in vitro salivary pellicle. Three rounds of panning resulted in the selection of 10 pellicle-binding phages, each displaying a novel peptide sequence. The peptides were synthesized and their binding to the in vitro salivary pellicle was characterized in the presence and absence of calcium ions and Tween-20. The antifouling property of hydroxyapatite (HA) and saliva-coated HA discs treated with and without SPBPs were evaluated against Streptococcus gordonii.

Results

Ten unique SPBPs were identified using the phage display. One of these peptides, SPBP 10 (NSAAVRAYSPPS), exhibited significant binding to the in vitro salivary pellicle which was neither influenced by calcium ions, nor affected by up to 0.5% Tween-20. Its antifouling property against S. gordonii was significantly higher on the treated surfaces than on untreated surfaces.

Conclusions

Use of the phage display library enabled us to find a specific SPBP with antifouling property towards S. gordonii.     

Lip biopsy for the diagnosis of Sjögren's syndrome: beware of the punch

A pilot study was performed to examine the presence of nerve fibres in minor salivary gland tissue samples obtained by two procedures: punch and linear incisional techniques. The study was undertaken on a convenience sample of five cryopreserved corpses (mean age 74 ± 3.5 years; three males and two females). Biopsies were performed on the buccal side of the lower lip, between the mid-line and the corner of the mouth. Each corpse had one side of the lower lip biopsied by punch and the contralateral side using a linear incision. All punch samples (100%) displayed severed nerve fibres, whereas no nerve fibres (0%) could be identified in the samples obtained by means of the linear incision technique. While the linear incision approach permitted retrieval of at least five glands, punch biopsies did not provide enough material for the diagnosis of Sjögren's syndrome. Within the limitations of the study, our results strongly discourage the punch technique for minor salivary gland lip biopsy and provide information on the superiority of the linear incisional biopsy in terms of neural damage. These results may also promote the undertaking of clinical trials on patients in whom Sjögren's syndrome is suspected, comparing the morbidity associated with the linear incisional technique vs. minimally invasive biopsies.     

利咽解毒液在颌面部骨折术后口腔护理中的应用

目的探讨利咽解毒液在颌面部骨折术后口腔护理中的应用效果。方法行手术治疗的颌面部骨折患者150例,按照随机数字表法分成A、B、C 3组,各50例。术后分别给予A组生理盐水、B组甲硝唑、C组利咽解毒液进行口腔护理。对比3组患者的口腔黏膜表面菌量、口腔恢复情况以及口腔并发症发生情况。结果干预后即刻和4 h后,C组患者的口腔黏膜表面菌量少于A、B组患者,差异有统计学意义(P<0.05)。护理干预后,C组患者的伤口愈合时间、口腔舒适度以及疼痛评分均低于A、B组患者,差异有统计学意义(P<0.01)。C组患者的口臭程度、唾液功能障碍或口干程度优于A、B组患者,差异有统计学意义(P<0.05)。结论运用利咽解毒液对颌面部骨折术后患者进行口腔冲洗,能有效控制口腔黏膜表面菌量,促进创口恢复,减少疼痛以及术后并发症的发生。     

Minimally invasive transoral robotic surgery for hiloparenchymal submandibular stone: Technical note on Flex Robotic System

Flex Robotic System allows a minimally invasive approach for transoral removal of submandibular salivary stones.     

4-6岁儿童唾液免疫生化指标与龋病的关系

目的 探讨龋病患者唾液有关免疫生化指标与龋病的关系。方法 收集4-6岁龋病患者、无龋者各45人,共90人,采用免疫放射法测定唾液中分泌型免疫球蛋白A（SIgA）的含量;用比浊法测定其溶菌酶（LZ）含量;用比色法测定其碱性磷酸酶（ALP）、乳酸脱氢酶（LDH）的含量。测定结果用 t 检验进行分析。结果 无龋人群、有龋人群LZ、ALP、SIgA含量的均数之间有显著性差异（P＜0.05）,无龋人群、有龋人群LDH之间无显著性差异（P>0.05）。
结论 龋病的发生可能与唾液的生化指标有关。