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Naturally-occurring cellular cytotoxicity mediated by neutrophil polymorphonuclears: requirements for the target cell
Abstract:
The purpose of the present study was to investigate the general conditions under which neutrophil polymorphonuclears (PMN) mediate antibody-independent cytolysis in the presence of normal human serum (NHS). Normal PMN were found to kill rabbit red blood cells (RRBC) only when cultured with 1% NHS. NHS was per se incapable of lysing RRBC. PMN from a patient with Chronic Granulomatous Disease did not destroy RRBC targets even in the presence of 1% NHS. In addition, cytotoxicity by normal PMN was significantly reduced by scavengers of oxygen metabolites. The results suggest that the target cell lysis by PMN in the presence of NHS requires a synergistic interaction between at least two mediators: serum factor(s) and oxygen metabolite(s).
Insights
Neutrophil polymorphonuclears (PMN) kill cells without antibodies when using normal human serum (NHS). This requires both serum factors and oxygen metabolites for effective cell lysis.
Area of Science:
- Immunology
- Cell Biology
- Hematology
Background:
- Neutrophil polymorphonuclears (PMN) are key immune cells involved in pathogen clearance.
- Antibody-dependent cell-mediated cytotoxicity is a well-established function of PMN.
- The mechanisms of antibody-independent cytolysis by PMN are less understood.
Purpose of the Study:
- To investigate the conditions enabling antibody-independent cytolysis mediated by neutrophil polymorphonuclears (PMN).
- To determine the role of normal human serum (NHS) and its components in PMN-induced cell lysis.
Main Methods:
- Normal PMN and PMN from a patient with Chronic Granulomatous Disease were used.
- Rabbit red blood cells (RRBC) served as target cells.
- Experiments involved culturing PMN with varying concentrations of NHS and using oxygen metabolite scavengers.
Main Results:
- Normal PMN lysed RRBC only when incubated with 1% NHS; NHS alone did not cause lysis.
- PMN from a patient with Chronic Granulomatous Disease showed no cytotoxic activity.
- Oxygen metabolite scavengers significantly reduced PMN-mediated cytotoxicity.
Conclusions:
- Antibody-independent cytolysis by PMN requires a synergistic interaction between serum factors and oxygen metabolites.
- This process is dependent on functional oxidative burst pathways in PMN.