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The Journal of Immunology, Vol 138, Issue 1 246-253, Copyright © 1987 by American Association of Immunologists

ARTICLES

Recovery of human neutrophils from complement attack: removal of the membrane attack complex by endocytosis and exocytosis

BP Morgan, JR Dankert and AF Esser

Nucleated cells can resist lysis by and recover from complement attack even after formation of the potentially cytolytic membrane attack complex on the cell surface. We have found that human neutrophils resist complement lysis by the physical removal of membrane attack complexes by both endocytic and exocytic process. The latter mechanism predominates, vesiculation being detectable within 60 sec of initiating the complement cascade. Sixty-five percent of the formed complexes are removed on plasma membrane vesicles, although only 2% of the cell surface is lost. Ultrastructural examination revealed that these vesicles were covered with ring-like "classical" complement lesions. Analysis of these vesicles by gel electrophoresis indicated that C9 was present exclusively in the form of a sodium dodecyl sulfate-resistant, high m.w. complex. In contrast, the 35% of C9 that remained associated with the cells was found to be inaccessible to a C9-specific monoclonal antibody, and was partly degraded, suggesting internalization of the membrane attack complex and proteolysis of some C9 molecules. The molar ratio of C9 to C8 was 12 to 1 on shed vesicles and on recovered cells.


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