Phosphoinositide hydrolysis mediated by H1 receptors in autoimmune myocarditis mice

• Main Authors: Nora Goren, Claudia Perez Leiros, Leonor Sterin-Borda, Enri S. Borda
• Format: Article
• Language: English
• Published: Hindawi Limited 1993-01-01
• Series: Mediators of Inflammation
• Online Access: http://dx.doi.org/10.1155/S0962935193000444

Stimulation of phosphoinositide hydrolysis in myocardium from autoimmune myocarditis mice by ThEA and histamine was assayed. Myocardium from autoimmune heart, but not the normal forms, specifically increased phosphoinositide turnover in the presence of histaminergic agonists. This increment was blocked by a specific H1 antagonist mepyramine and to the same extent by the phospholipase C inhibitor NCDC. By using a binding assay H1 histaminergic receptors were detected in autoimmune heart membrane preparations, but this was not observed in normal heart. These data suggest that autoimmune myocardium expressed a functional H1 receptor that could involve a distinctive mechanism operating in the disease.