Bacteriology
Screening, preparation and identification of a broad-spectrum monoclonal antibody against Streptococcus pneumoniae surface protein A
Xiaonan Guo, Xiangyu Meng, Bo Li, Haoxuan Gu, Lin Sun, Yongge Wu, Tiejun Gu
Published 2019-05-31
Cite as Chin J Microbiol Immunol, 2019, 39(5): 365-369. DOI: 10.3760/cma.j.issn.0254-5101.2019.05.007
Abstract
ObjectiveTo screen and prepare a broad-spectrum monoclonal antibody against Streptococcus pneumoniae (S.pneumoniae) surface protein A (PspA) and to evaluate its potential in clinical practice.
MethodsHybridoma cells were screened and inoculated into the abdominal cavities of BALB/c mice to prepare antibodies in ascites. Monoclonal antibodies were obtained by ammonium sulfate precipitation and protein A affinity chromatography and then identified by SDS-PAGE and Western blot. Their specificity, isoforms and killing activities in vitro were analyzed.
ResultsA broad-spectrum monoclonal antibody that recognized PspA subclasses 2, 3 and 4 was obtained. Its in vitro killing rate against S. pneumoniae reached 40.3%.
ConclusionsA broad-spectrum monoclonal antibody that could specifically bind to PspA was successfully prepared with a strong in vitro killing activity. This study provided reference for clinical diagnosis of S. pneumoniae-related diseases, quality assessment of S. pneumoniae vaccines and further research on monoclonal antibody therapeutics.
Key words:
Streptococcus pneumoniae; Streptococcus pneumoniae surface protein A (PspA); Monoclonal antibody
Contributor Information
Xiaonan Guo
National Engineering Laboratory for AIDS Vaccine, Jilin University, Changchun 130012, China
Xiangyu Meng
Bo Li
Haoxuan Gu
Lin Sun
Yongge Wu
Tiejun Gu