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274
Antigenic modulation and turnover in human neutrophils.
The Journal of Clinical Investigation
|July 1, 1979
Summary
Neutrophils clear antibody-coated membrane antigens via a temperature-dependent internalization process. This process involves antigen clearance and reappearance, indicating dynamic neutrophil membrane turnover.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Membrane constituent turnover is crucial for biological processes.
- Neutrophil function relies on cell surface interactions and signaling.
Purpose of the Study:
- To investigate the dynamics of neutrophil membrane antigen clearance and reappearance.
- To understand the mechanisms underlying neutrophil recognition of antibody-coated cells.
Main Methods:
- Utilized immunologic methods to study neutrophil-neutrophil recognition.
- Employed antibody sensitization of neutrophils and subsequent incubation at varying temperatures.
- Applied direct immunofluorescence with fluorescein-conjugated IgG to visualize antibody clearance.
Main Results:
- Neutrophil recognition response decayed over time at 37°C after antibody sensitization.
- Antibody-mediated antigenicity clearance occurred via temperature-dependent aggregation and endocytosis.
- Neutrophils regained the capacity for sensitization after a recovery period, independent of cycloheximide.
Conclusions:
- Neutrophils actively clear surface-bound antibodies and associated antigens through internalization.
- This clearance mechanism is temperature-dependent and reversible.
- Neutrophil membrane antigenicity is dynamic, with capacity for reappearance after clearance.
