Patchanee Chootong. Production and characterization of monoclonal antibodies specific to Leptospira interrogans and their applications . Master's Degree(Immunology). Mahidol University. : Mahidol University, 2004.
Production and characterization of monoclonal antibodies specific to Leptospira interrogans and their applications
Abstract:
Serogroup/serovar, broadly reactive, and genus specific monoclonal
antibodies were produced by immunizing BALB/c mice with whole cell antigens
prepared from L. interrogans serovar Cynopteri and Ranarum. The specificity of the
produced monoclonal antibodies were tested by an indirect ELISA, using panel
antigens prepared from 20 serovars of pathogenic, a saprophytic leptospires and 9
genera of the other bacteria. One monoclonal antibody, 2B3A8, reacted only with L.
interrogans serogroup/serovar Cynopteri and another monoclonal antibody, 8C1E11,
reacted only with L. interrogans serogroup/serovar Ranarum. The genus specific
MAb, 6B2A8, reacted with all leptospiral serovar in panel antigens. The broadly
reactive monoclonal antibody, 7A5F12, reacted with 13 serovars of pathogenic L.
interrogans. The isotypes of the monoclonal antibodies 2B3A8, 6B2A8, 7A5F12 and
8C1E11 are IgG3κ, IgMκ, IgG2bκ, and IgMκ, respectively. Western blot staining of
whole cell antigen prepared from serovar Cynopteri or Ranarum revealed that the
2B3A8, 6B2A8 and 8C1E11 MAbs recognized carbohydrate epitopes which
presented as a diffuse band of MW varying from 26.00-29.00, 20.50-23.50 and 20.50-
24.75 Kda, respectively. The 7A5F12 MAb recognized the protein epitope at MW 38
Kda. To identify the L. interrogans serogroup/serovar Cynopteri or Ranarum, the
serovar specific MAbs, 2B3A8 and 8C1E11 were used for development the latex
agglutination test. The specificity of latex reagent was studied by using panel antigens
prepared from 21 pathogenic and one saprophytic leptospiral serovars. The 2B3A8
latex reagent agglutinated only with L. interrogans serovar Cynopteri. The 8C1E11
latex reagent agglutinated with L. interrogans serovar Canicola, Ranarum and
Tarrasovi. The sensitivity of latex agglutination test was evaluated by using the
homologous viable antigen. The minimum bacteria number that can be agglutinated
with the 2B3A8 and 8C1E11 latex reagents were 4.5 x 105 or 6.0x 105 leptospires/ml,
respectively. These latex reagents will be very useful for rapid identification of L.
interrogans serovar Cynopteri and Ranarum