Abstract:
:K-562 human leukemia cells grown in the presence of specific goat anti-K-562 gamma globulin, F(ab)'2, Fab', or Fab showed a decrease in DNA and protein syntheses and a loss of cell viability within several hours. Eventually all cells died and lysed within 2-5 days. These events occurred in the absence of added effector cells or complement. The effect on the cell was not due to proteolytic or other external lytic activity generated at the cell surface, since 51Cr-labeled bystander cells or antibody-sensitized bystander cells (chicken erythrocytes or K-562 cells) were not lysed when added to cultures of K-562 cells incubated with immune globulin. The anti-K-562 gamma globulin was not observed to patch or cap on K-562 cells, but the ability of bound immunoglobulin to fix complement decreased markedly (50% in 60 min), so that no complement-mediated cytolysis could be observed at 2 hr. However, the immunoglobulin, at least portions of it, reacted with fluorescein--labeled rabbit anti-goat gamma globulin for about 16 hr. 125I-labeled immune globulin appeared to be internalized and released into the medium as small degradation products. 125I-labeled Fab did not appear to be internalized, since it was released intact and more rapidly from cells than the intact globulin.
journal_name
Bloodjournal_title
Bloodauthors
Wust CJ,Green M,Lozzio CB,Lozzio BBsubject
Has Abstractpub_date
1982-01-01 00:00:00pages
133-40issue
1eissn
0006-4971issn
1528-0020journal_volume
59pub_type
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