Effects of human interferon preparations on neutrophil function

Area of Science:

• Immunology
• Cell Biology

Background:

• Interferons (IFNs) are crucial cytokines with diverse immune functions.
• Neutrophils (PMNs) are key innate immune cells involved in pathogen clearance.
• The effects of different IFN types on neutrophil function require detailed investigation.

Purpose of the Study:

• To investigate the impact of human leukocyte (alpha) interferon (IFN) and fibroblast (beta) IFN preparations on normal human neutrophil functions.
• To assess the in vitro and in vivo effects of specific IFN preparations (PIF-A, PIF-B) on neutrophil activity.

Main Methods:

• In vitro assessment of neutrophil chemiluminescence (CL), bactericidal activity against Staph. aureus, migration, phagocytosis, and enzyme release.
• Evaluation of PMN functions in patients receiving PIF-A for multiple myeloma.

Main Results:

• PIF-B significantly enhanced neutrophil chemiluminescence and impaired bacterial killing.
• PIF-A showed minimal effects on bactericidal activity and no impact on CL in vitro.
• Beta-IFN had no effect on neutrophil bactericidal activity or CL.
• All tested IFNs reduced neutrophil migration, but phagocytosis and enzyme release remained unaffected.
• Neutrophils from patients treated with PIF-A exhibited enhanced CL responses.

Conclusions:

• Human leukocyte (alpha) interferon preparations, particularly PIF-B, can modulate neutrophil functions, including enhanced chemiluminescence and reduced bactericidal capacity.
• These findings suggest that high-dose interferon therapy in immunocompromised patients warrants careful consideration due to potential increased infectious complications.
• Further research is needed to fully elucidate the clinical implications of IFN-induced alterations in neutrophil function.