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Presence of immunoreactive atrial natriuretic peptide in nerve fibres and conduction cells in the conduction system of the bovine heart

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Abstract

Previous findings of atrial (A-type) natriuretic peptide (ANP) in nervous tissue, such as the brain and the superior cervical ganglia, led us to investigate the possible occurrence of ANP in nervous tissue in the heart. The distribution of ANP in the bovine heart, particularly its conduction system, was examined by the use of immunohistochemical methods and an antiserum against α-hANP. ANP immunoreactivity was frequently detected in atrial myocytes and in the Purkinje fibres of the AV-bundle, and was sometimes seen in the Purkinje fibres of the bundle branches and their ramifications. On the other hand, ANP immunoreactivity was never seen in the conduction cells of SA- and AV-nodes. ANP immunoreactivity was also detected in small nerve-fibre varicosities, mainly in the AV-node and AV-bundle. Most of these varicosities were located in the proximity of the conduction cells, but some occurred close to fine blood vessels or in the walls of arterioles. These observations show for the first time that ANP immunoreactivity is present not only in atrial myocytes and conduction cells but also in nerve-fibre varicosities in the conduction system. The observations suggest that ANP may act as a neuromodulator and/or neurotransmitter in the conduction system.

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  1. Department of Anatomy, University of Umeå, S-90187, Umeå, Sweden

    Magnus Hansson & Sture Forsgren

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  1. Magnus Hansson
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  2. Sture Forsgren
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Hansson, M., Forsgren, S. Presence of immunoreactive atrial natriuretic peptide in nerve fibres and conduction cells in the conduction system of the bovine heart. Anat Embryol 188, 331–337 (1993). https://doi.org/10.1007/BF00185942

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