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Depression of human polymorphonuclear leucocyte function by anti-malarial drugs
Immunology
|May 1, 1986
Summary
This study shows that common anti-malarial drugs impair human polymorphonuclear leucocyte (PMN) functions, particularly their antimicrobial activities. Pyrimethamine and mefloquine demonstrated the most significant inhibitory effects on PMN function.
Area of Science:
- Immunology
- Pharmacology
- Infectious Diseases
Background:
- Polymorphonuclear leucocytes (PMNs) are crucial for innate immunity and fighting infections.
- Anti-malarial drugs are widely used, but their impact on host immune cells requires investigation.
Purpose of the Study:
- To investigate the in vitro effects of five anti-malarial drugs on human PMN function.
- To identify which PMN functions are most affected and which drugs exhibit the greatest potency.
Main Methods:
- Human PMNs were isolated and exposed to quinine, chloroquine, pyrimethamine, mefloquine, and quinacrine in vitro.
- Key PMN functions assessed included adherence, locomotion, iodination reaction, and hexose-monophosphate shunt activity.
Main Results:
- All tested anti-malarial drugs generally inhibited PMN iodination reaction and locomotion.
- Pyrimethamine and mefloquine were the most potent inhibitors, significantly affecting PMN iodination and locomotion at low concentrations.
- Effects on PMN adherence were least pronounced, with intermediate effects on hexose-monophosphate shunt activity.
Conclusions:
- Anti-malarial drugs can suppress critical PMN functions essential for antimicrobial activity.
- The findings highlight potential immunomodulatory side effects of these anti-malarial therapies.