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Immunohistochemical and ultrastructural localisation of peptide-containing nerves and myocardial cells in the human atrial appendage

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The innervation and myocardial cells of the human atrial appendage were investigated by means of immunocytochemical and ultrastructural techniques using both tissue sections and whole mount preparations. A dense innervation of the myocardium, blood vessels and endocardium was revealed with antisera to general neuronal (protein gene product 9.5 and synaptophysin) and Schwann cell markers (S-100). The majority of nerve fibres possessed neuropeptide Y immunoreactivity and were found associated with myocardial cells, around small arteries and arterioles at the adventitial-medial border and forming a plexus in the endocardium. Subpopulations of nerve fibres displayed immunoreactivity for vasoactive intestinal polypeptide, somatostatin, substance P and calcitonin gene-related peptide. In whole-mount preparations of endocardium, substance P and calcitonin gene-related peptide immunoreactivities were found to coexist in the same varicose nerve terminals. Ultrastructural studies revealed the presence of numerous varicose terminals associated with myocardial, vascular smooth muscle and endothelial cells. Neuropeptide Y immunoreactivity was localised to large electron-dense secretory vesicles in nerve terminals which also contained numerous small vesicles. Atrial natriuretic peptide immunoreactivity occurred exclusively in myocardial cells where it was localised to large secretory vesicles. The human atrial appendage comprises a neuroendocrine complex of peptidecontaining nerves and myocardial cells producing ANP.

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Authors and Affiliations

  1. Department of Histochemistry, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK

    J. Wharton, S. Gulbenkian, A. Merighi & J. M. Polak

  2. Department of Surgery, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK

    K. M. Taylor

  3. Lafayette Clinic, Department of Psychiatry, 951E Lafayette, Detroit, Michigan, USA

    D. M. Kuhn

  4. Max-Planck-Institut für Psychiatrie, Abteilung Neurochemie, Planegg-Martinsried, Germany

    R. Jahn

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  1. J. Wharton
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  2. S. Gulbenkian
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Wharton, J., Gulbenkian, S., Merighi, A. et al. Immunohistochemical and ultrastructural localisation of peptide-containing nerves and myocardial cells in the human atrial appendage. Cell Tissue Res. 254, 155–166 (1988). https://doi.org/10.1007/BF00220029

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