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Alloimmune IgG binds and modulates cardiac beta-adrenoceptor activity
Clinical and Experimental Immunology
|October 1, 1984
Summary
Murine alloimmune IgG targeting major histocompatibility complex class I molecules can bind to and activate beta-adrenoceptors. This immune IgG mimics beta-adrenoceptor agonists, affecting cardiac function.
Area of Science:
- Immunology
- Cardiology
- Pharmacology
Background:
- The major histocompatibility complex (MHC) plays a crucial role in immune responses.
- Beta-adrenoceptors are key regulators of cardiac function.
Purpose of the Study:
- To investigate if murine alloimmune IgG against MHC class I products can interact with cardiac beta-adrenoceptors.
- To determine if such IgG can modulate myocardial contractility and heart rate.
Main Methods:
- Purification of IgG from murine alloimmune sera.
- Binding assays using mouse myocardial membranes and (-) 3H-DHA.
- Assessment of contractile and chronotropic effects on isolated mouse atria.
- Inhibition studies using beta-adrenoceptor antagonists.
Main Results:
- Purified immune IgG bound to mouse myocardial beta-adrenoceptors.
- Immune IgG acted as a competitive inhibitor of (-) 3H-DHA binding.
- Immune IgG induced positive inotropic and chronotropic effects on isolated atria.
- These effects were reversible with beta-adrenoceptor antagonists.
Conclusions:
- Murine alloimmune IgG against MHC class I products can recognize and bind to beta-adrenoceptors.
- This immune IgG can mimic the action of beta-adrenoceptor agonists, stimulating cardiac activity.