Release of gram-negative outer-membrane proteins into human serum and septic rat blood and their interactions with immunoglobulin in antiserum to Escherichia coli J5

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Abstract

Prior studies indicate that 3 bacterial outer-membrane proteins (OMPs) are released into serum associated with lipopolysaccharide (LPS) and are bound by IgG in antiserum to Escherichia coli J5 (anti-J5 IgG). The present studies analyzed the interaction of the OMPs with anti-J5 IgG and evaluated their release in an infected burn model of gram-negative sepsis. Affinity purification studies were performed on filtrates of bacteria incubated in human serum and plasma from rats with sepsis by use of O chain-specific anti- LPS IgG and anti-J5 IgG. All 3 OMPs were captured from septic rat blood by anti-LPS IgG. Release of OMPs into serum was highest for immature bacterial cultures and was increased by antibiotics in vitro and in vivo. Anti-J5 IgG selectively captured an 18-kDa OMP released into serum and into plasma from septic rats. The results raise the possibility that anti-J5 IgG may, in part, protect via anti-OMP antibodies.

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APA

Hellman, J., Loiselle, P. M., Zanzot, E. M., Allaire, J. E., Tehan, M. M., Boyle, L. A., … Warren, H. S. (2000). Release of gram-negative outer-membrane proteins into human serum and septic rat blood and their interactions with immunoglobulin in antiserum to Escherichia coli J5. Journal of Infectious Diseases, 181(3), 1034–1043. https://doi.org/10.1086/315302

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