PMID- 6174666 OWN - NLM STAT- MEDLINE DA - 19820521 DCOM- 19820521 LR - 20091118 IS - 0022-1007 (Print) IS - 0022-1007 (Linking) VI - 155 IP - 4 DP - 1982 Apr 1 TI - Hybridoma antibodies against protective and nonprotective antigenic determinants of a structurally defined polypeptide fragment of streptococcal M protein. PG - 1010-8 AB - Hybridoma technology was used to produce a set of monoclonal antibodies against a purified polypeptide fragment of type 24 streptococcal M protein to delineate the protective determinants of M protein exposed on the surface of the virulent streptococci. Several hybridoma antibodies were found to be opsonic against the homologous type streptococci. At least two of these antibodies (IIC3.7 and IIC4.6) protected mice against challenge infections with the homologous, but not a heterologous, serotype of bacteria. One of the hybridoma antibodies that reacted in high dilution (1:204,800) with the isolated M protein failed to react with the M protein on the surface of type 24 streptococci, and thus did not opsonize the homologous organisms or protect mice against challenge infections. Because hybridoma antibodies are directed against a single distinct immunodeterminant, these results indicate that protective immunity may be directed at any one of several distinct antigenic determinants of M protein exposed on the surface of virulent group A streptococci. FAU - Hasty, D L AU - Hasty DL FAU - Beachey, E H AU - Beachey EH FAU - Simpson, W A AU - Simpson WA FAU - Dale, J B AU - Dale JB LA - eng GR - AI-10085/AI/NIAID NIH HHS/United States GR - DE-05062/DE/NIDCR NIH HHS/United States GR - IA-13550/PHS HHS/United States GR - etc. PT - Journal Article PT - Research Support, U.S. Gov't, Non-P.H.S. PT - Research Support, U.S. Gov't, P.H.S. PL - UNITED STATES TA - J Exp Med JT - The Journal of experimental medicine JID - 2985109R RN - 0 (Antibodies, Monoclonal) RN - 0 (Antigens, Bacterial) RN - 0 (Bacterial Outer Membrane Proteins) RN - 0 (Bacterial Proteins) RN - 0 (Carrier Proteins) RN - 0 (Epitopes) RN - 0 (Immunoglobulin G) RN - 0 (Opsonin Proteins) RN - 0 (Peptides) RN - 0 (streptococcal M protein) SB - IM MH - Animals MH - Antibodies, Monoclonal/*biosynthesis MH - Antigen-Antibody Reactions MH - Antigens, Bacterial MH - *Bacterial Outer Membrane Proteins MH - Bacterial Proteins/*immunology MH - Blood Bactericidal Activity MH - *Carrier Proteins MH - Enzyme-Linked Immunosorbent Assay MH - *Epitopes MH - Female MH - Hybridomas/immunology MH - Immunization, Passive MH - Immunoglobulin G/classification MH - Mice MH - Mice, Inbred BALB C MH - Opsonin Proteins/immunology MH - Peptides/*immunology MH - Streptococcal Infections/immunology MH - Streptococcus pyogenes/immunology PMC - PMC2186657 OID - NLM: PMC2186657 EDAT- 1982/04/01 MHDA- 1982/04/01 00:01 CRDT- 1982/04/01 00:00 PST - ppublish SO - J Exp Med. 1982 Apr 1;155(4):1010-8.