title: In Vitro and In Vivo studies of monoclonal antibodies with prominent bactericidal activity against Burkholderia pseudomallei and Burkholderia mallei.
abstract: Our laboratory has developed more than a hundred mouse monoclonal antibodies (MAbs) against Burkholderia pseudomallei and Burkholderia mallei. These antibodies have been categorized into different groups based on their specificities and the biochemical natures of their target antigens. The current study first examined the bactericidal activities of a number of these MAbs by an in vitro opsonic assay. Then, the in vivo protective efficacy of selected MAbs was evaluated using BALB/c mice challenged intranasally with a lethal dose of the bacteria. The opsonic assay using dimethyl sulfoxide-treated human HL-60 cells as phagocytes revealed that 19 out of 47 tested MAbs (40%) have prominent bactericidal activities against B. pseudomallei and/or B. mallei. Interestingly, all MAbs with strong opsonic activities are those with specificity against either the capsular polysaccharides (PS) or the lipopolysaccharides (LPS) of the bacteria. On the other hand, none of the MAbs reacting to bacterial proteins or glycoproteins showed prominent bactericidal activity. Further study revealed that the antigenic epitopes on either the capsular PS or LPS molecules were readily available for binding in intact bacteria, while the epitopes on proteins/glycoproteins were less accessible to the MAbs. Our in vivo study showed that four MAbs reactive to either the capsular PS or LPS were highly effective in protecting mice against lethal bacterial challenge. The result is compatible with that of our in vitro study. The MAbs with the highest protective efficacy are those reactive to either the capsular PS or LPS of the Burkholderia bacteria.
authors: Department of Environmental and Infectious Disease Sciences, American Registry of Pathology, Armed Forces Institute of Pathology, Washington, DC 20306, USA.
authors: Shimin
authors: S
authors: Zhang
authors: Shaw-Huey
authors: SH
authors: Feng
authors: Bingjie
authors: B
authors: Li
authors: Hyung-Yong
authors: HY
authors: Kim
authors: Joe
authors: J
authors: Rodriguez
authors: Shien
authors: S
authors: Tsai
authors: Shyh-Ching
authors: SC
authors: Lo
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000276:immunology*; D000907:Antibodies, Bacterial / Q000008:administration & dosage / Q000276:immunology* / Q000302:isolation & purification; D000911:Antibodies, Monoclonal / Q000008:administration & dosage / Q000276:immunology* / Q000302:isolation & purification; D042726:Burkholderia mallei / Q000276:immunology*; D016957:Burkholderia pseudomallei / Q000276:immunology*; D005260:Female; D005896:Glanders / Q000628:therapy*; D007155:Immunologic Factors / Q000008:administration & dosage / Q000276:immunology; D008554:Melioidosis / Q000628:therapy*; D051379:Mice; D008807:Mice, Inbred BALB C; D050296:Microbial Viability; D010587:Phagocytosis; D016019:Survival Analysis; D016896:Treatment Outcome
chemical_list: D000900:Anti-Bacterial Agents; D000907:Antibodies, Bacterial; D000911:Antibodies, Monoclonal; D007155:Immunologic Factors