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IgE-induced release of a platelet-activating factor from rabbit lung
Journal of Immunology (Baltimore, Md. : 1950)
|December 1, 1975
Summary
Rabbit lungs release platelet-activating factor (PAFL) upon antigen challenge, which stimulates serotonin release from platelets. This lung-derived PAFL is distinct from basophil-derived PAF, suggesting unique biological roles.
Area of Science:
- Immunology
- Pharmacology
- Cell Biology
Background:
- Sensitized rabbit lungs release platelet-activating factor (PAFL) when challenged with specific antigens or antibodies.
- This release is calcium-dependent and less pronounced in lungs with both IgG and IgE antibodies.
- The released PAFL stimulates serotonin secretion from rabbit platelets.
Purpose of the Study:
- To characterize the platelet-activating factor (PAFL) released from rabbit lungs.
- To compare the properties of lung-derived PAFL with basophil-derived PAF (PAFB).
- To investigate the functional activity of PAFL on rabbit platelets.
Main Methods:
- Utilizing sensitized rabbit lung fragments challenged with antigen or anti-IgE.
- Measuring PAFL release and its effect on washed rabbit platelets.
- Comparing PAFL activity with known agonists like ADP, thrombin, and PAFB.
Main Results:
- Rabbit lung fragments release PAFL upon immunological challenge.
- PAFL stimulates serotonin secretion from rabbit platelets, distinct from ADP or thrombin.
- Rabbit platelets desensitized to PAFB still respond to PAFL, indicating distinct molecular identities.
Conclusions:
- Rabbit lungs produce a unique platelet-activating factor (PAFL) upon antigen challenge.
- Lung-derived PAFL exhibits distinct properties compared to basophil-derived PAF (PAFB).
- PAFL represents a significant mediator in lung-associated immune responses, with specific platelet interactions.