摘要:
For the first time, an O-specific polysaccharide antigen that is a Shigella sonnei, phase I, exopolysaccharide has been produced and characterized, said exopolysaccharide being an authentic natural compound in the form of a bacterial capsular polysaccharide consisting of 1-100 repeating disaccharide units of O-[4-amino-2-(N-acetyl)amino-2,4-dideoxy-²-D-galactopyranosyl]-(1†’4)-O-[2-(N-acetyl)amino-2-deoxy-±-L-altrpyranuronic acid] linked by (1†’3) bonds to form a polysaccharide chain. The exopolysaccharide has a molecular mass of from 0.4 to 400 kDa, contains a non-toxic lipid component, namely non-hydroxylated fatty acids, and exhibits low pyrogenicity and high immunogenicity, generating mucosal protection against Shigella sonnei shigellosis by inducing the synthesis of specific antibodies against S. sonnei in mammals, including humans. Without using lipopolysaccharides as the source of production, an exopolysaccharide with a high degree of purity is produced from a liquid phase culture of S. sonnei bacteria by means of a workable industrial method with a high yield. Effective, highly specific and safe vaccines for the prophylaxis and/or treatment of Shigella sonnei shigellosis are developed on the basis of the above-mentioned exopolysaccharide, as well as pharmaceutical compositions with a broad spectrum of action, in particular, in modulating immune response.
摘要:
For the first time, an O-specific polysaccharide antigen that is a Shigella sonnei, phase I, exopolysaccharide has been produced and characterized, said exopolysaccharide being an authentic natural compound in the form of a bacterial capsular polysaccharide consisting of 1-100 repeating disaccharide units of O-[4-amino-2-(N-acetyl)amino-2,4-dideoxy-β-D-galactopyranosyl]-(1→4)-O-[2-(N-acetyl)amino-2-deoxy-α-L-altrpyranuronic acid] linked by (1→3) bonds to form a polysaccharide chain. The exopolysaccharide has a molecular mass of from 0.4 to 400 kDa, contains a non-toxic lipid component, namely non-hydroxylated fatty acids, and exhibits low pyrogenicity and high immunogenicity, generating mucosal protection against Shigella sonnei shigellosis by inducing the synthesis of specific antibodies against S. sonnei in mammals, including humans. Without using lipopolysaccharides as the source of production, an exopolysaccharide with a high degree of purity is produced from a liquid phase culture of S. sonnei bacteria by means of a workable industrial method with a high yield. Effective, highly specific and safe vaccines for the prophylaxis and/or treatment of Shigella sonnei shigellosis are developed on the basis of the above-mentioned exopolysaccharide, as well as pharmaceutical compositions with a broad spectrum of action, in particular, in modulating immune response.
摘要:
A biologically active fraction (BAF) is presented containing mainly S-lipopolysaccharide (LPS) from gram-negative bacteria producing endotoxic LPSs. These fractions are characterized in that in the lipid A of S-LPS the mole ratio of D-glucosamine and beta-hydroxy acids selected from the group comprising beta-hydroxydecanoic, beta-hydroxydodecanoic, beta-hydroxytetradecanoic, beta-hydroxyhexadecanoic, is approximately 2:1-4, and the mole ratio of D-glucosamine and higher fatty acids, connected both by amide and ester links, in the lipid A of S-LPS is approximately 2:3-7. A method of isolating BAF, containing mainly S-LPS from gram-negative bacteria producing endotoxic S-LPSs, is also presented. The obtained BAFs have pyrogenicity at the level of commercial polysaccharide vaccines and low endotoxicity, have high immunogenicity, which makes it possible to use them as vaccines for mammals, including humans. They are an inducer of cytokines and also may be considered to be a prophylactic tolerogenic anti-shock preparation.