title: In vitro formation of complement activation products by lipopolysaccharide chemotypes of Salmonella minnesota.
abstract: We have applied immunoassays for complement activation products C4d, fragment Bb and the protein S-C5b-9 neoantigen (S-MAC) to assess activation of classical, alternative and terminal pathways, respectively, by lipopolysaccharides (LPS) from the smooth strain (SS) of Salmonella minnesota and the shallow rough (core) mutants R60, R345, R5 and R7. Incubations of sera (n = 6) with LPS generated small and insignificant quantities of Bb and S-MAC in the case of Rb, Rc and Rd chemotypes and slightly greater quantities with Ra. SS-LPS brought about significant (p = 0.01) increases in the formation of both Bb and S-MAC. No significant changes were observed in the concentration of C4d. Polymyxin B enhanced Bb and S-MAC production by SS-LPS, optimally at the lowest concentration of polymyxin B studied, 10 ng/ml. These data confirm and extend observations about complement activation by LPS and suggest that immunoassay may be useful in studying mechanisms of complement activation.
authors.affiliation: Department of Medicine, School of Graduate Medical Education, Seton Hall University, St. Joseph's Hospital and Medical Center, Paterson, N.J.
authors.forename: J S
authors.initials: JS
authors.lastname: Gardiner
authors.forename: L B
authors.initials: LB
authors.lastname: Keil
authors.forename: V A
authors.initials: VA
authors.lastname: DeBari
mesh_terms: D000328:Adult; D003167:Complement Activation; D003181:Complement C4 / Q000096:biosynthesis; D015935:Complement C4b; D011415:Complement Factor B / Q000096:biosynthesis; D015938:Complement Membrane Attack Complex / Q000096:biosynthesis; D005260:Female; D006801:Humans; D007118:Immunoassay; D008070:Lipopolysaccharides / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D010446:Peptide Fragments / Q000096:biosynthesis; D011112:Polymyxin B / Q000494:pharmacology; D012475:Salmonella
chemical_list: D003181:Complement C4; D015938:Complement Membrane Attack Complex; D008070:Lipopolysaccharides; D010446:Peptide Fragments; D015935:Complement C4b; C032261:complement C4d; D011415:Complement Factor B; D011112:Polymyxin B