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Effect of human leukocyte interferon on phagocytic activity of polymorphonuclear leukocytes
Abstract:
The effect of homologous leukocyte interferon HuIFN on the phagocytic activity of human polymorphonuclear (PMN) leukocytes was examined. The PMN cells were obtained from healthy donors and they were grown on coverslips. Escherichia coli labelled with 32P-orthophosphate was phagocytized in the presence of fresh homologous serum during a 15 min incubation period. PMN cells pretreated with interferon for at least 3 hours ingested more bacteria as compared to untreated controls. This effect was dose dependent, in maximal effect being obtained with 10(3) units per ml. The effect was species specific and it was neutralized by antiinterferon globulin.
Insights
Human leukocyte interferon enhances the ability of polymorphonuclear (PMN) leukocytes to engulf bacteria. This interferon-mediated boost in phagocytic activity is dose-dependent and species-specific.
Area of Science:
- Immunology
- Cell Biology
- Virology
Background:
- Phagocytic activity of human polymorphonuclear (PMN) leukocytes is crucial for innate immunity.
- Interferons are known modulators of immune responses.
Purpose of the Study:
- To investigate the effect of homologous leukocyte interferon (HuIFN) on the phagocytic capacity of human PMN cells.
- To determine the dose-dependency and specificity of this effect.
Main Methods:
- Human PMN leukocytes were isolated from healthy donors.
- Cells were pretreated with varying concentrations of HuIFN for at least 3 hours.
- Phagocytosis of 32P-orthophosphate-labeled Escherichia coli was assessed in the presence of homologous serum.
Main Results:
- HuIFN pretreatment significantly increased bacterial ingestion by PMN cells compared to controls.
- The enhancement of phagocytosis demonstrated a dose-dependent relationship, with maximal effect at 10(3) units/ml.
- The observed effect was species-specific and could be neutralized by anti-interferon globulin.
Conclusions:
- Homologous leukocyte interferon enhances the phagocytic activity of human PMN leukocytes.
- This immunomodulatory effect is mediated through specific interferon-receptor interactions and is dose-dependent.