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J8-and diphtheria toxoid antibodies help protect against group A strep.

Vaccine Weekly

| July 02, 2003 | COPYRIGHT 2003 NewsRX. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

2003 JUL 2 - (NewsRx.com & NewsRx.net) -- J8-and diphtheria toxoid-specific antibodies contribute to protection against group A streptococcus.

"A conformationally constrained, minimally conserved peptide from the M protein of group A streptococcus (GAS) has been defined. It consists of 12 amino acids from the C-repeat region within a non-M protein helix-forming sequence and is referred to as 'J8.' Here, we investigate the immunogenicity of a J8-diphtheria toxoid (DT) conjugate adjuvanted with the human-compatible adjuvants, SBAS2 and alum, and demonstrate that it is capable of inducing opsonic antibodies and can protect outbred mice from virulent challenge," scientists writing in the Journal of Infectious Diseases report.

"In a range of experiments, protection correlated with the titer of J8-specific antibodies and not with the induction of J8-specific T cells," wrote Michael R. Batzloff and collaborators at the Queensland Institute of Medical Research in Australia. "However, DT-specific antibodies (as well as J8-specific antibodies) were shown to stain the surface of fixed GAS and to be capable of opsonizing live ...

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