Atheromatous plaques usually contain antigens of the periodontitis-causing bacteria Streptococcus mutans though molecular mechanism of this incorporation remains unknown. Since vascular adhesion and inflammatory poten...Atheromatous plaques usually contain antigens of the periodontitis-causing bacteria Streptococcus mutans though molecular mechanism of this incorporation remains unknown. Since vascular adhesion and inflammatory potential of Immune Complexes (IC) are known we investigated the naturally occurring plasma antibodies that recognize major antigens from S. mutans. S. mutans-binding plasma proteins (SMBP) prepared by affinity chromatography on a column of heat-killed S. mutans could recognize α- and β-linked glucose in dextran and yeast respectively but not galactose in glycoproteins. SMBP contained only three proteins, each corresponding in electrophoretic mobility to standard plasma IgG, IgA or IgM. The major positively and negatively charged protein antigens (PSMAg and NSMAg) isolated from S. mutans by electrophoresis and ion exchange chromatography respectively were recognized sugar-reversibly by the anti-β-glucan antibody (ABG) and though less avidly, by the dextran-binding immunoglobulin (DIg) in normal plasma. NSMAg addition resulted in near doubling of IC-bound immunoglobulins in immunoglobulin-rich fraction of plasma. IC isolated from above fraction after NSMAg addition had substantially more IgA and IgM content than total plasma immunoglobulins. IC formation by NSMAg was significantly inhibited by ABG- and DIg-specific sugars or by selective withdrawal of ABG or DIg from plasma. ABG and DIg being relatively high titer plasma antibodies IC formation with them suggested a possible route for vascular adhesion and damage by S. mutans and its antigens. Further, high IgA content of these ICs indicated their susceptibility to tissue uptake through cell surface galectin-1 for which IgA is the lone immunoglobulin ligand.展开更多
目的:构建葡聚糖结合蛋白B(glucan b ind ing prote in B,GbpB)-壳聚糖纳米颗粒系统,并检测其经鼻免疫大鼠的效果。方法:制备GbpB-壳聚糖纳米颗粒系统,经鼻黏膜免疫SD大鼠,用ELISA法检测血清中针对GbpB的特异IgG抗体滴度及唾液中针对Gbp...目的:构建葡聚糖结合蛋白B(glucan b ind ing prote in B,GbpB)-壳聚糖纳米颗粒系统,并检测其经鼻免疫大鼠的效果。方法:制备GbpB-壳聚糖纳米颗粒系统,经鼻黏膜免疫SD大鼠,用ELISA法检测血清中针对GbpB的特异IgG抗体滴度及唾液中针对GbpB的特异SIgA抗体滴度。与阳性对照GbpB蛋白组及未免疫组、空白壳聚糖纳米颗粒组作比较。结果:该载体系统经鼻免疫SD大鼠所产生的血清及唾液中针对GbpB的IgG和SIgA抗体滴度远大于未免疫组和空白载体组,而与阳性对照组抗体滴度相当。但维持的抗体滴度更稳定和持久。结论:壳聚糖纳米颗粒系统可作为经鼻运输多肽防龋疫苗的载体系统。展开更多
文摘Atheromatous plaques usually contain antigens of the periodontitis-causing bacteria Streptococcus mutans though molecular mechanism of this incorporation remains unknown. Since vascular adhesion and inflammatory potential of Immune Complexes (IC) are known we investigated the naturally occurring plasma antibodies that recognize major antigens from S. mutans. S. mutans-binding plasma proteins (SMBP) prepared by affinity chromatography on a column of heat-killed S. mutans could recognize α- and β-linked glucose in dextran and yeast respectively but not galactose in glycoproteins. SMBP contained only three proteins, each corresponding in electrophoretic mobility to standard plasma IgG, IgA or IgM. The major positively and negatively charged protein antigens (PSMAg and NSMAg) isolated from S. mutans by electrophoresis and ion exchange chromatography respectively were recognized sugar-reversibly by the anti-β-glucan antibody (ABG) and though less avidly, by the dextran-binding immunoglobulin (DIg) in normal plasma. NSMAg addition resulted in near doubling of IC-bound immunoglobulins in immunoglobulin-rich fraction of plasma. IC isolated from above fraction after NSMAg addition had substantially more IgA and IgM content than total plasma immunoglobulins. IC formation by NSMAg was significantly inhibited by ABG- and DIg-specific sugars or by selective withdrawal of ABG or DIg from plasma. ABG and DIg being relatively high titer plasma antibodies IC formation with them suggested a possible route for vascular adhesion and damage by S. mutans and its antigens. Further, high IgA content of these ICs indicated their susceptibility to tissue uptake through cell surface galectin-1 for which IgA is the lone immunoglobulin ligand.
文摘目的:构建葡聚糖结合蛋白B(glucan b ind ing prote in B,GbpB)-壳聚糖纳米颗粒系统,并检测其经鼻免疫大鼠的效果。方法:制备GbpB-壳聚糖纳米颗粒系统,经鼻黏膜免疫SD大鼠,用ELISA法检测血清中针对GbpB的特异IgG抗体滴度及唾液中针对GbpB的特异SIgA抗体滴度。与阳性对照GbpB蛋白组及未免疫组、空白壳聚糖纳米颗粒组作比较。结果:该载体系统经鼻免疫SD大鼠所产生的血清及唾液中针对GbpB的IgG和SIgA抗体滴度远大于未免疫组和空白载体组,而与阳性对照组抗体滴度相当。但维持的抗体滴度更稳定和持久。结论:壳聚糖纳米颗粒系统可作为经鼻运输多肽防龋疫苗的载体系统。
