Immunization with Temperature-Sensitive Mutants of Actinobacillus pleuropneumoniae Induces Protective Hemolysin-Neutralizing Antibodies in Mice |
| |
Authors: | Wyatt Byrd Anne Morris Hooke |
| |
Institution: | (1) Department of Microbiology, Miami University, Oxford, OH 45056, USA , US |
| |
Abstract: | The immunogenicity and protective potential of three
temperature-sensitive mutants of Actinobacillus pleuropneumoniae were
evaluated in mice with respect to antibodies against the capsular
polysaccharide, lipopolysaccharide, outer membrane proteins, and hemolysin
protein. Antibodies to the capsular polysaccharide and lipopolysaccharide
could not be correlated with protection in the mice; there were no
significant differences among the anti-capsular and anti-lipopolysaccharide
antibody titers regardless of the severity of infection. Sera from mice
immunized with the mutants and challenged with the wild type contained
antibodies that reacted in immunoblots to four major outer membrane proteins
(66, 39, 29, and 16 kDa) regardless of the severity of infection after
challenge. Both the tight and coaster mutants synthesized and secreted the
105-kDa hemolysin protein exotoxin in vitro and in vivo; hemolysin protein
neutralization titers and the blotting intensity of the sera, however, varied
inversely with the severity of infection. Sera from mice surviving challenge
with little to no lung involvement stained the hemolysin band more intensely
and had significantly higher neutralization titers (P < 0.05) than sera
from mice that either died or survived with severe pulmonary hemorrhage.
These results confirm the importance of the hemolysin in pathogenesis and the
need for including it in any vaccine preparation.
Received: 26 August 1996 / Accepted: 3 September 1996 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|