In vitro immunological activities of the polysaccharide fraction from Haemophilus influenzae type a endotoxin.

Infection and Immunity
M GuenounouJ Agneray

Abstract

Mild hydrolysis of Haemophilus influenzae type a lipopolysaccharide by ion exchangers in the presence of chloroform, to remove the lipid moiety, yielded a nontoxic and immunogenic polysaccharide fraction. This polysaccharide selectively triggered murine B lymphocytes in vitro: (i) it induced enhancement of thymidine incorporation and stimulated antibody secretion in cultures of normal and nude mouse spleen cells; (ii) it did not stimulate splenic T lymphocytes; (iii) the activation of B lymphocytes was not absolutely dependent on the presence of macrophages. Sepharose 4B gel filtration showed that this polysaccharide consisted at least of two fractions: PS I (molecular weight [MW] 10(6)) and PS II (MW 10(4)). Only PS I was found to act as a polyclonal B cell activator. EDTA treatment dissociated the polysaccharide into PS III (MW 10(6)) and PS IV (MW 10(4)), which was not reassembled after the addition of 0.02 M CaCl2. Both fractions PS III and PS IV were unable to stimulate B lymphocytes. The immunological active fraction of H. influenzae polysaccharide is PS I. This fraction consists of a high-molecular-weight group (10(6)) and an association of 10(4)-MW aggregated units.

References

Feb 1, 1974·The Journal of Infectious Diseases·F W Denny
Aug 1, 1974·Journal of Immunological Methods·I A Ly, R I Mishell
Nov 1, 1969·Proceedings of the Society for Experimental Biology and Medicine·M B Rittenberg, K L Pratt
Sep 1, 1967·The Journal of Experimental Medicine·R I Mishell, R W Dutton
Apr 26, 1963·Science·N K Jerne, A A Nordin

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