1. Target-Agnostic Identification of Functional Monoclonal Antibodies Against Klebsiella pneumoniae Multimeric MrkA Fimbrial Subunit.
- Author
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Qun Wang, Chew-shun Chang, Pennini, Meghan, Pelletier, Mark, Rajan, Saravanan, Jingying Zha, Yan Chen, Cvitkovic, Romana, Sadowska, Agnieszka, Heidbrink Thompson, Jenny, Hung Yu Lin, Barnes, Arnita, Rickert, Keith, Wilson, Susan, Stover, C. Kendall, Dall'Acqua, William F., Chowdhury, Partha S., Xiaodong Xiao, Wang, Qun, and Chang, Chew-Shun
- Subjects
MONOCLONAL antibodies ,KLEBSIELLA pneumoniae ,MAYER-Rokitansky-Kuster-Hauser syndrome ,SEX differentiation disorders ,MEDICAL screening ,DIAGNOSIS ,PHYSIOLOGY ,THERAPEUTICS ,KLEBSIELLA infections ,ANIMAL experimentation ,BACTERIAL vaccines ,BIOFILMS ,CELLS ,IMMUNITY ,KLEBSIELLA ,MEMBRANE proteins ,MICE ,PEPTIDES ,PHAGOCYTOSIS ,RESPIRATORY mucosa ,BACTERIAL antibodies ,PREVENTION - Abstract
The increasing incidence of Klebsiella pneumoniae infections refractory to treatment with current broad-spectrum antibiotic classes warrants the exploration of alternative approaches, such as antibody therapy and/or vaccines, for prevention and treatment. However, the lack of validated targets shared by spectrums of clinical strains poses a significant challenge. We adopted a target-agnostic approach to identify protective antibodies against K. pneumoniae Several monoclonal antibodies were isolated from phage display and hybridoma platforms by functional screening for opsonophagocytic killing activity. We further identified their common target antigen to be MrkA, a major protein in the type III fimbriae complex, and showed that these serotype-independent anti-MrkA antibodies reduced biofilm formation in vitro and conferred protection in multiple murine pneumonia models. Importantly, mice immunized with purified MrkA proteins also showed reduced bacterial burden following K. pneumoniae challenge. Taken together, these results support MrkA as a promising target for K. pneumoniae antibody therapeutics and vaccines. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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