The cellular immune response elicited by Mycobacterium bovis Bacille Calmette-Guérin (BCG) has been carefully investigated, but the humoral immune response has been partially neglected. BALB/c mice were immunized...The cellular immune response elicited by Mycobacterium bovis Bacille Calmette-Guérin (BCG) has been carefully investigated, but the humoral immune response has been partially neglected. BALB/c mice were immunized with BCG strain used to immunize humans. Anti-BCG antibodies, as assayed by ELISA, began to appear in the sera after the third week of immunization and plateaued three weeks after the 8th immunization. The total immunoglobulins (Igs) were purified by caprylic acid method from pooled serum collected after the 8th immunization. Anti-BCG antigen antibodies were detected in the total Igs preparation as well as in IgG, IgM, IgA, IgG1, IgG2a, and IgG2b, but not in the IgG3. Distinct BCG proteins were recognized the IgGs in Western blot analysis. Opsonization of BCG bacilli by the purified Igs potentiated internalization of the bacteria by murine Raw 264.7 macrophages. The intracellular BCG elimination coincided with the induction of NO production, which was more pronounced in cells infected with opsonized BCG compared to those infected with the non-opsonized bacteria. Coincidently, the production of NO was also higher in macrophages infected with opsonized BCG (maximal NO production at 48 h of incubation). The obtained results demonstrate that repeated inoculations of BCG effectively activate the humoral immune response, justifying the use of BCG as a live recombinant vaccine vector to insert genes encoding virulence factors controlled by antibodies.展开更多
结核病是由结核分枝杆菌引发的一种传染病。1882年,结核分枝杆菌(mycobacterium tuberculosis,Mtb)由Rober t Koch发现,至今仍是致人类死亡主要病原体之一。更可怕是,多重耐药(MDR)和广泛耐药(XDR)Mtb患病率的明显增加。上世纪90年代,...结核病是由结核分枝杆菌引发的一种传染病。1882年,结核分枝杆菌(mycobacterium tuberculosis,Mtb)由Rober t Koch发现,至今仍是致人类死亡主要病原体之一。更可怕是,多重耐药(MDR)和广泛耐药(XDR)Mtb患病率的明显增加。上世纪90年代,世界卫生组织(World Health Organization,WHO)宣布结核病处于全球性紧急状态。结核病的最佳预防措施是接种疫苗,但是卡介苗(bacille Calmette-Guér in,BCG)对成人的保护效力不完全。随着Mtb基因序列的检测成功,疫苗的研究取得了重大的进展,已经有十几种候选疫苗准备或已进人体临床试验阶段。当前热门的候选疫苗包括重组BCG疫苗、减毒Mtb活疫苗和亚单位疫苗等。本文将从这些方面进行综述。展开更多
文摘The cellular immune response elicited by Mycobacterium bovis Bacille Calmette-Guérin (BCG) has been carefully investigated, but the humoral immune response has been partially neglected. BALB/c mice were immunized with BCG strain used to immunize humans. Anti-BCG antibodies, as assayed by ELISA, began to appear in the sera after the third week of immunization and plateaued three weeks after the 8th immunization. The total immunoglobulins (Igs) were purified by caprylic acid method from pooled serum collected after the 8th immunization. Anti-BCG antigen antibodies were detected in the total Igs preparation as well as in IgG, IgM, IgA, IgG1, IgG2a, and IgG2b, but not in the IgG3. Distinct BCG proteins were recognized the IgGs in Western blot analysis. Opsonization of BCG bacilli by the purified Igs potentiated internalization of the bacteria by murine Raw 264.7 macrophages. The intracellular BCG elimination coincided with the induction of NO production, which was more pronounced in cells infected with opsonized BCG compared to those infected with the non-opsonized bacteria. Coincidently, the production of NO was also higher in macrophages infected with opsonized BCG (maximal NO production at 48 h of incubation). The obtained results demonstrate that repeated inoculations of BCG effectively activate the humoral immune response, justifying the use of BCG as a live recombinant vaccine vector to insert genes encoding virulence factors controlled by antibodies.
文摘结核病是由结核分枝杆菌引发的一种传染病。1882年,结核分枝杆菌(mycobacterium tuberculosis,Mtb)由Rober t Koch发现,至今仍是致人类死亡主要病原体之一。更可怕是,多重耐药(MDR)和广泛耐药(XDR)Mtb患病率的明显增加。上世纪90年代,世界卫生组织(World Health Organization,WHO)宣布结核病处于全球性紧急状态。结核病的最佳预防措施是接种疫苗,但是卡介苗(bacille Calmette-Guér in,BCG)对成人的保护效力不完全。随着Mtb基因序列的检测成功,疫苗的研究取得了重大的进展,已经有十几种候选疫苗准备或已进人体临床试验阶段。当前热门的候选疫苗包括重组BCG疫苗、减毒Mtb活疫苗和亚单位疫苗等。本文将从这些方面进行综述。
