The levels of Streptococcus（S.） mutans infections in saliva were evaluated and a comparison for specific antibody levels among children with different levels of S. mutans infection was made. The promising epitopic r...The levels of Streptococcus（S.） mutans infections in saliva were evaluated and a comparison for specific antibody levels among children with different levels of S. mutans infection was made. The promising epitopic regions of antigen AgⅠ/ Ⅱ（PAc） and glucosyltransferase（GTF） for potential vaccine targets related to S. mutans adherence were screened. A total of 94 children aged 3–4 years were randomly selected, including 53 caries-negative and 41 caries-positive children. The values of S. mutans and those of salivary total secretory immunoglobulin A（s Ig A）, anti-PAc and anti-Glucan binding domain（anti-GLU） were compared to determine the correlation among them. It was found the level of s-Ig A against specific antigens did not increase with increasing severity of S. mutans infection, and the complete amino acid sequence of PAc and GTFB was analyzed using the DNAStar Protean system for developing specific anti-caries vaccines related to S. mutans adherence. A significantly positive correlation between the amount of S. mutans and children decayed, missing, and filled teeth index was observed. No significant difference was detected in specific s Ig A against PAc or GLU between any two groups. No significant correlation was found between such specific s Ig A and caries index. A total of 16 peptides from PAc as well as 13 peptides from GTFB were chosen for further investigation. S. mutans colonization contributed to early children caries as an important etiological factor. The level of s Ig A against specific antigens did not increase with increasing severity of S. mutans infection in children. The epitopes of PAc and GTF have been screened to develop the peptide-based or protein-based anti-caries vaccines.展开更多
目的:研究氟化物与五倍子水提取物联合应用对变形链球菌生长和代谢的影响。方法:取10 m L的无菌培养管120支,分为12组,对照组1组,实验组11组,每组各10支。对照组中含无菌去离子水,实验组中含有不同浓度氟化钠(0.01%、0.02%)、五倍子水...目的:研究氟化物与五倍子水提取物联合应用对变形链球菌生长和代谢的影响。方法:取10 m L的无菌培养管120支,分为12组,对照组1组,实验组11组,每组各10支。对照组中含无菌去离子水,实验组中含有不同浓度氟化钠(0.01%、0.02%)、五倍子水提取物(0.25、0.5、1 mg/m L)及氟化钠与五倍子联合应用的培养基内培养变形链球菌标准菌株,检测培养前后两组培养基光密度值及p H的变化。结果:与对照组相比,各实验组变链菌的生长受到明显抑制,同时各组培养基的p H变化也逐渐减小,氟化钠与五倍子联合应用时未发现明显的协同效应。结论:氟化钠及五倍子水提取物均可显著抑制变形链球菌的生长及产酸代谢活动,两者联合应用时未见明显的协同效应。展开更多
In order to enhance the mucosal immunity of anti-caries DNA vaccine, chitosan-DNA microparticles for musocal vaccination were prepared by a coacervation method. The physicochemical structure of microparticles was inve...In order to enhance the mucosal immunity of anti-caries DNA vaccine, chitosan-DNA microparticles for musocal vaccination were prepared by a coacervation method. The physicochemical structure of microparticles was investigated by a scanning electron microscope (SEM) and a cofocal laser scanning microscope (CLSM). For in-vitro studies, Hela cell was transfected by chitosan-DNA microparticles.The expression of proteins was measured by the immunohistochemical methods, and the cytotocity of chitosan in Hela cell line was determined by the MTT assay. The experimental results show that the microparticles are about 2-6 μm in size and spherical in shape. The encapsulation efficiency is 99%, and the DNA is almost captured in the micropraticles. Plasmid loaded into chitosan microparticles is distributed throughout these particles. The number of positive staining cells of chitosan-pGJA-P transfected cell is more than that of naked plasmid transfect cells, but less than that of Lipofect-DNA complex group. Chitosan was found to be less cytotoxic compared with lipofectin (p<0.01).展开更多
The development of kids toothpaste in Chinese market has been introduced, and the common characterisUcs of kids toothpaste in the production and sales have been analyzed. Through the analysis of the characteristics of...The development of kids toothpaste in Chinese market has been introduced, and the common characterisUcs of kids toothpaste in the production and sales have been analyzed. Through the analysis of the characteristics of kids oral care, the special technical requirements of kids toothpaste are elucidated. Finally, suggestions for the future development of kids toothpaste are put forward.展开更多
基金supported by grants from the National Natural Science Foundation of China(No.81371130 and No.81271129)Special Research Fund for the Doctroal Program of Higher Education of China(No.20110141130008)
文摘The levels of Streptococcus（S.） mutans infections in saliva were evaluated and a comparison for specific antibody levels among children with different levels of S. mutans infection was made. The promising epitopic regions of antigen AgⅠ/ Ⅱ（PAc） and glucosyltransferase（GTF） for potential vaccine targets related to S. mutans adherence were screened. A total of 94 children aged 3–4 years were randomly selected, including 53 caries-negative and 41 caries-positive children. The values of S. mutans and those of salivary total secretory immunoglobulin A（s Ig A）, anti-PAc and anti-Glucan binding domain（anti-GLU） were compared to determine the correlation among them. It was found the level of s-Ig A against specific antigens did not increase with increasing severity of S. mutans infection, and the complete amino acid sequence of PAc and GTFB was analyzed using the DNAStar Protean system for developing specific anti-caries vaccines related to S. mutans adherence. A significantly positive correlation between the amount of S. mutans and children decayed, missing, and filled teeth index was observed. No significant difference was detected in specific s Ig A against PAc or GLU between any two groups. No significant correlation was found between such specific s Ig A and caries index. A total of 16 peptides from PAc as well as 13 peptides from GTFB were chosen for further investigation. S. mutans colonization contributed to early children caries as an important etiological factor. The level of s Ig A against specific antigens did not increase with increasing severity of S. mutans infection in children. The epitopes of PAc and GTF have been screened to develop the peptide-based or protein-based anti-caries vaccines.
文摘In order to enhance the mucosal immunity of anti-caries DNA vaccine, chitosan-DNA microparticles for musocal vaccination were prepared by a coacervation method. The physicochemical structure of microparticles was investigated by a scanning electron microscope (SEM) and a cofocal laser scanning microscope (CLSM). For in-vitro studies, Hela cell was transfected by chitosan-DNA microparticles.The expression of proteins was measured by the immunohistochemical methods, and the cytotocity of chitosan in Hela cell line was determined by the MTT assay. The experimental results show that the microparticles are about 2-6 μm in size and spherical in shape. The encapsulation efficiency is 99%, and the DNA is almost captured in the micropraticles. Plasmid loaded into chitosan microparticles is distributed throughout these particles. The number of positive staining cells of chitosan-pGJA-P transfected cell is more than that of naked plasmid transfect cells, but less than that of Lipofect-DNA complex group. Chitosan was found to be less cytotoxic compared with lipofectin (p<0.01).
文摘The development of kids toothpaste in Chinese market has been introduced, and the common characterisUcs of kids toothpaste in the production and sales have been analyzed. Through the analysis of the characteristics of kids oral care, the special technical requirements of kids toothpaste are elucidated. Finally, suggestions for the future development of kids toothpaste are put forward.
