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, Volume 18, Issue 1–2, pp 194–196 | Cite as

IgE-mediated activation of human heartin vitro

  • G. Marone
  • M. Triggiani
  • R. Cirillo
  • A. Giacummo
  • S. Hammarström
  • M. Condorelli
Histamine and Cardiovascular System

Abstract

We used human cardiac tissue from the right atrial appendages of patients undergoing corrective heart surgery to study content andde novo synthesis of mediators in the human heart. Human heart tissue contained 1.7±0.1 μg/g wet weight of histamine (mean±S.E.M.) and spontaneously produced 6-keto-PGF (38.4 ng/g wet weight/min), PGF (1.9 ng/g wet weight/min), PGE (1.7 ng/g wet weight/min) and thromboxane B2 (T×B2) (1.7 ng/g wet weight/min). Spontaneous release of PGD2, leukotriene C4 and histamine was negligible. Rabbit anti-human IgE (1–10 μg/ml) dose-dependently induced the release of histmaine (5 to 15% of the total histamine content) and of PGD2 (5 to 100 ng/g of wet tissue). The effect of anti-IgE was dose-related and reached a maximum after 30–45 min of incubation. A significant linear correlation (rs=0.90; p<0.001) was found betweende novo synthesis of PGD2 and the secretion of histamine induced by anti-IgE challenge of human heart. These results support the concept that PGI2 is the main, but not the sole, product of arachidonic acid metabolism synthesized by human heartin vitro. Additionally, anti-IgE challenge of human heartin vitro induces the release of histamine and PGD2. The local concentrations of these mediators appear high enough to play some role in the modulation of several cardiac functionsin vivo.

Keywords

Histamine Arachidonic Acid Thromboxane Human Heart PGI2 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Birkhäuser Verlag 1986

Authors and Affiliations

  • G. Marone
    • 1
  • M. Triggiani
    • 1
  • R. Cirillo
    • 1
  • A. Giacummo
    • 1
  • S. Hammarström
    • 2
  • M. Condorelli
    • 1
  1. 1.Department of MedicineUniversity of Naples II School of MedicineNaplesItaly
  2. 2.Department of ChemistryKarolinska InstitutetStockholmSweden

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