Production of IL-1 beta and IL-6 by adherent spleen cells after the stimulation with lipopolysaccharides from Salmonella enteritidis strain

Three different procedures were used to isolate lipopolysaccharides from the Salmonella enteritidis strain 477: phenol-water extraction with ethanol precipitation (LPS 1), phenol-water extraction with methanol precipitation (LPS 2) and FPLC purification (LPS 1/1). Production of interleukin-1 beta (IL-1 beta) and interleukin-6 (IL-6) was observed in the supernatants of adherent spleen cells of BALB/c mice after the stimulation and cultivation of the cells. The quantity of IL-1 beta and IL-6 depended on the method of LPS isolation. The highest level of IL-1 beta was recorded at LPS 2, and of IL-6 at the stimulation of cells by means of LPS 1.

Monoclonal antibodies against the common polysaccharide of Streptococcus agalactiae

A monoclonal antibody giving a dominant reaction with the group-specific polysaccharide of streptococcus group B in an ELISA test has been developed. The purified polysaccharide exhibited a high positivity with reference anti B streptococcal antiserum in the ELISA test. Cross-tests of antibodies with other groups of streptococci provided a minimum cross-reaction only in the case of G streptococci. Monoclonal antibodies were prepared using Streptococcus agalactiae S 589 MT strain isolated from a case of bovine mastitis which does not express Ia, Ib, II, III, IV and V type antigens, nor C, R and X protein antigens.

Purification and partial immunochemical characterization of proteins of fimbriae F107 from Escherichia coli isolated from edema disease of pigs

The paper describes the isolation, purification and characterization of F107-fimbrial proteins, obtained by thermoelution from Escherichia coli 107/86. Isolation of the pure F107 protein was done by FPLC chromatography, employing Superose 12, Mono Q, and Phenyl-Superose columns. The highest purity of the F107 protein was achieved with Superose 12 HR 10/30. Purity checking by a HPLC system Waters 625 LC (Millipore) proved the absence of protein admixtures in a fraction from Superose 12. Analysis of the molar mass of F107 proteins by SDS PAGE revealed that F107 fimbriae consist of two proteins, one of M = 43 kDa (minor), and other of M = 18.9 kDa (major). Western blot analysis with rabbit polyclonal antiserum confirmed that the 18.9 kDa protein was the major characteristic unit of F107 fimbriae.