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Immunol Lett. 1987 Feb;14(3):203-8.

Antibody-independent killing of gram-negative bacteria via the classical pathway of complement.


The experiments in this paper provided evidence that, besides lipopolysaccharides (LPS), porins of gram-negative bacteria bind to C1q and C1. From these experiments, we concluded that the association of LPS and porins (outer membrane proteins, OMP) may potentiate the C1q and C1 binding in the absence of specific antibodies. This antibody independent binding of C1 to LPS and porins is a prerequisite for the activation of the classical pathway of complement leading to the killing of serum-sensitive bacteria.

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