The in vitro cellular immune response to quartz

Area of Science:

• Immunology
• Cell Biology
• Toxicology

Background:

• Macrophages release biologically active substances modulating immune responses.
• Prostaglandins play a significant role in macrophage function and immune regulation.

Purpose of the Study:

• To investigate the role of macrophage prostaglandin release in the immune response to quartz.
• To assess the impact of quartz and a prostaglandin inhibitor on immune cell function.

Main Methods:

• Incubation of guinea pig splenic lymphocytes and peritoneal macrophages with quartz (DQ12), Corundum, and aspirin.
• Measurement of lymphocyte proliferation (3H-thymidine incorporation) and lymphokine release (MIF).
• Assessment of macrophage function through EA rosetting and phagocytosis.

Main Results:

• Quartz significantly suppressed immune responses, indicated by reduced lymphocyte proliferation and lymphokine production.
• Aspirin, a prostaglandin synthesis inhibitor, restored the immunological parameters affected by quartz exposure.
• Macrophage function (EA rosetting and phagocytosis) was also assessed in response to quartz and aspirin.

Conclusions:

• Macrophage prostaglandin release is implicated in the immune response to quartz.
• Prostaglandins may act as mediators in the initial stages of lipid peroxidation following quartz exposure.
• Inhibiting prostaglandin synthesis can counteract quartz-induced immune suppression.