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Macrophage migration as an index of immune status
1Division of Biochemistry, Central Drug Research Institute, Lucknow, India.
Abstract:
Peritoneal macrophages from mice and guinea pigs pretreated with Freund's complete adjuvant (FCA) or any other immunostimulant when packed in a glass capillary and placed in a migration chamber migrated to a larger area than macrophages from normal untreated animals. The extent of migration could be correlated with the dose of FCA and the period of treatment. Under optimum conditions the ratio between the areas of migration of macrophages from FCA-treated animals and of macrophages from untreated animals was above 3.0. A close correlation was observed between macrophage migration and delayed type hypersensitivity (DTH) response in animals sensitized with ovalbumin or sheep red blood cells. The macrophages of immunostimulant-treated animals had relatively higher phagocytic activity. The macrophage migration index (MMI) appears to be a close correlate of macrophage activation and possibly also of the status of cell mediated immune response.
Insights
Immunostimulants like Freund's complete adjuvant (FCA) significantly enhance macrophage migration and phagocytic activity in mice and guinea pigs. This macrophage migration index (MMI) correlates with delayed type hypersensitivity (DTH) responses, indicating immune activation.
Area of Science:
- Immunology
- Cell Biology
Background:
- Macrophages are key immune cells involved in host defense.
- Immune stimulants can modulate macrophage function and migration.
- Understanding macrophage activation is crucial for assessing cell-mediated immunity.
Purpose of the Study:
- To investigate the effect of immunostimulants on macrophage migration and phagocytic activity.
- To correlate macrophage migration with delayed type hypersensitivity (DTH) responses.
- To establish the macrophage migration index (MMI) as a measure of macrophage activation.
Main Methods:
- Peritoneal macrophages were isolated from mice and guinea pigs pretreated with Freund's complete adjuvant (FCA) or other immunostimulants.
- Macrophage migration was assessed using a capillary migration assay in a migration chamber.
- Phagocytic activity was measured in treated and untreated animals.
- Delayed type hypersensitivity (DTH) responses were evaluated in sensitized animals.
Main Results:
- Immunostimulant-pretreated macrophages exhibited significantly increased migration areas compared to controls.
- Macrophage migration extent correlated positively with FCA dose and treatment duration.
- A macrophage migration index (MMI) above 3.0 was observed under optimal conditions.
- Macrophage migration showed a strong correlation with DTH responses.
- Immunostimulant-treated macrophages displayed enhanced phagocytic activity.
Conclusions:
- Immunostimulant pretreatment, particularly with FCA, markedly enhances peritoneal macrophage migration.
- The MMI serves as a reliable indicator of macrophage activation.
- MMI is a valuable correlate for assessing the status of cell-mediated immune responses, including DTH.