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Altered neutrophil migration during bacterial infection associated with a serum modulator of cellular motility
Abstract:
The motility of polymorphonuclear leukocytes (PMNLs) from 25 patients with bacterial infection was assessed by using the migration-under-agarose assay. A spectrum of responses was observed. Random and directional motility stimulated by C5a or pressed in parallel. These responses contrasted with those of normal PMNLs preincubated with either FMLP or C5a; preincubation with one chemotaxin inhibited a subsequent response to the same stimulus but did not inhibit the response to the other. The parallel responses of patient PMNLs to C5a and FMLP suggest that the altered motility reflects a perturbation independent of a specific chemotactic receptor. Heat-inactivated serum from patients with bacterial infection, when preincubated with normal PMNLs, resulted in significant enhancement of both random and directional migration. The data indicate that bacterial infection is associated with appearance of a modulator of neutrophil motility.
Insights
Bacterial infections alter neutrophil motility, suggesting a novel modulator is present. This finding impacts understanding of immune response during infection.
Area of Science:
- Immunology
- Cell Biology
- Infectious Diseases
Background:
- Polymorphonuclear leukocytes (PMNLs) are crucial for innate immunity.
- Neutrophil motility is essential for effective bacterial clearance.
- Altered PMNL function can impair host defense during infection.
Purpose of the Study:
- To investigate the motility of PMNLs in patients with bacterial infections.
- To identify potential alterations in neutrophil chemotaxis and response to stimuli.
- To explore the role of serum factors in modulating neutrophil behavior during infection.
Main Methods:
- Migration-under-agarose assay used to assess PMNL motility.
- Chemotactic stimuli C5a and FMLP were employed.
- Normal PMNLs were preincubated with patient serum.
Main Results:
- PMNLs from bacterial infection patients showed altered random and directional migration.
- Patient PMNLs exhibited parallel responses to C5a and FMLP, suggesting a non-specific mechanism.
- Heat-inactivated patient serum enhanced normal PMNL migration.
Conclusions:
- Bacterial infection is associated with changes in neutrophil motility.
- A novel modulator of neutrophil function may appear during bacterial infections.
- These findings suggest a complex interplay between infection and immune cell behavior.