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Factor-specific deactivation of leucocyte chemotaxis in vivo
Abstract:
This report analyses the locomotory capacity of polymorphonuclear leucocytes (PMNL) isolated from 7 patients with bacterial meningitis. 7 healthy control subjects were also investigated in parallel. It was found that PMNL from the patients suffering from meningitis, isolated both from peripheral blood and from the cerebrospinal fluid, had lost their ability to respond chemotactically to activated serum but not to the chemotactic peptide f-Met-Leu-Phe. The normal chemotactic responsiveness of blood PMNL was restored once the patients recovered from infection.
Insights
Polymorphonuclear leucocytes (PMNL) from bacterial meningitis patients lose their ability to respond to activated serum. This impaired chemotaxis, observed in both blood and cerebrospinal fluid, is restored upon patient recovery, indicating a reversible effect of infection.
Area of Science:
- Immunology
- Cell Biology
- Infectious Diseases
Background:
- Bacterial meningitis is a serious infection affecting the central nervous system.
- Polymorphonuclear leucocytes (PMNL) are critical immune cells involved in combating bacterial infections.
- Understanding PMNL function during infection is vital for developing effective treatments.
Purpose of the Study:
- To analyze the locomotory capacity of PMNL in patients with bacterial meningitis.
- To compare PMNL function in infected patients with healthy controls.
- To investigate the reversibility of PMNL functional deficits after recovery.
Main Methods:
- Isolation of PMNL from peripheral blood and cerebrospinal fluid of 7 bacterial meningitis patients.
- Isolation of PMNL from 7 healthy control subjects.
- Chemotaxis assays using activated serum and the chemotactic peptide f-Met-Leu-Phe.
Main Results:
- PMNL from meningitis patients showed a loss of chemotactic response to activated serum.
- PMNL from meningitis patients retained chemotactic responsiveness to f-Met-Leu-Phe.
- Normal chemotactic responsiveness of blood PMNL was restored in patients after recovery from infection.
Conclusions:
- Bacterial meningitis impairs the chemotactic responsiveness of PMNL to specific stimuli.
- The observed PMNL dysfunction is reversible and linked to the active infection state.
- These findings highlight the impact of bacterial meningitis on innate immune cell function.