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Related Experiment Videos

The human cardiac mast cell: localization, isolation, phenotype, and functional characterization

W R Sperr1, H C Bankl, G Mundigler

  • 1Department of Internal Medicine I, University of Vienna, Austria.

Blood
|December 1, 1994
PubMed
Summary

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Researchers identified human cardiac mast cells (CMCs) in heart tissue, primarily in atrial appendages. These novel mast cells (MCs) share characteristics with lung and uterus MCs, releasing histamine upon stimulation.

Area of Science:

  • Immunology
  • Cardiology
  • Cell Biology

Background:

  • Mast cells (MCs) are immune cells involved in allergic reactions and inflammation.
  • The presence and function of mast cells in human cardiac tissue have not been well-characterized.
  • Understanding cardiac mast cells (CMCs) is crucial for investigating cardiac inflammatory and fibrotic processes.

Purpose of the Study:

  • To isolate and characterize human cardiac mast cells (CMCs).
  • To compare the properties of CMCs with mast cells from other tissues (uterus, skin, lung).
  • To investigate the functional responses of CMCs, including histamine release.

Main Methods:

  • Human heart tissue from cardiomyopathy patients undergoing transplantation was used.
  • Cardiac mast cells (CMCs) were isolated via enzymatic digestion.

Related Experiment Videos

  • Characterization involved toluidine blue staining, immunofluorescence, monoclonal antibodies (MoAbs), and histamine measurement.

    • Main Results:

    • Substantial amounts of CMCs were found in atrial appendages (0.5–1.5% of isolated cells), but not in ventricular tissue.
    • CMCs expressed surface IgE, c-kit receptor (CD117), CD45, and CD54, and were identified as MCTC type (tryptase and chymase positive).
    • Stimulation of IgE or SCF receptors on CMCs induced histamine secretion, similar to lung and uterus MCs.

    Conclusions:

    • Human cardiac mast cells (CMCs) are a novel mast cell type predominantly located in the atrial appendages.
    • CMCs exhibit surface antigen and functional characteristics similar to mast cells found in the lung and uterus.
    • These findings suggest a potential role for CMCs in cardiac inflammatory responses and disease.