Related Experiment Videos
Human neutrophil migratory function: modulatory effect of interactions with opsonized particles
Abstract:
Human polymorphonuclear neutrophils preexposed to cytotaxin or to phagocytizable particles exhibited reduced spontaneous and chemotactic migratory responses. This influence of cytotaxin appears to be related to toxic effects of by-products of hexose monophosphate shunt stimulation. To determine whether a phagocytic stimulus may inhibit subsequent neutrophil migratory functions by the same mechanism, we assessed spontaneous and chemotactic migratory functions of neutrophils from individuals with chronic granulomatous disease exposed to antibody-opsonized sheep erythrocytes. Our results showed that phagocytosis of such particles did not alter these migratory responses of chronic granulomatous disease neutrophils and suggest that phagocytic stimulation of normal neutrophils may modulate migratory function by some mechanism dependent upon hexose monophosphate shunt stimulation.
Insights
Cytotaxin exposure reduces neutrophil migration, possibly via toxic by-products. Phagocytosis of particles by neutrophils with chronic granulomatous disease did not affect migration, suggesting a role for hexose monophosphate shunt stimulation in normal neutrophils.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Neutrophil migration is crucial for immune response.
- Cytotaxin and phagocytosis can affect neutrophil migratory functions.
- Hexose monophosphate shunt (HMS) stimulation is implicated in cytotaxin's effects.
Purpose of the Study:
- To investigate if phagocytic stimuli inhibit neutrophil migration via HMS stimulation.
- To compare migratory responses of normal and chronic granulomatous disease (CGD) neutrophils.
Main Methods:
- Assessed spontaneous and chemotactic migration of neutrophils.
- Exposed neutrophils to cytotaxin, phagocytizable particles, and antibody-opsonized sheep erythrocytes.
- Studied neutrophils from individuals with CGD.
Main Results:
- Cytotaxin exposure reduced neutrophil migration.
- Phagocytosis of antibody-opsonized sheep erythrocytes did not alter CGD neutrophil migration.
- Suggests HMS stimulation is involved in phagocytosis-induced modulation of normal neutrophil migration.
Conclusions:
- Phagocytic stimuli may modulate normal neutrophil migration through HMS-dependent mechanisms.
- CGD neutrophils, lacking a functional HMS, are not affected by phagocytosis in the same way.
- Highlights the role of HMS in regulating neutrophil function during immune responses.