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Chromogranins A and B are co-localized with atrial natriuretic peptides in secretory granules of rat heart

HJ Steiner, R Weiler, C Ludescher, KW Schmid and H Winkler

Department of Pathology, University of Innsbruck, Austria.

We investigated the occurrence and subcellular localization of chromogranins A and B in atrial myoendocrine cells of rat heart, using immunological methods. Immunoblotting revealed the presence of both chromogranin A and B in an extract from large granules isolated from this tissue by subcellular fractionation. Immunohistochemistry at the ultrastructural level demonstrated the presence of chromogranin A and B in secretory granules. These organelles also immunostained for atrial natriuretic peptides (ANP). Within a given section, all granules were labeled with immunogold for these three antigens. This apparent co- localization of the three antigens was confirmed by double immunostaining with immunogold particles of different sizes. We conclude that, in agreement with their endocrine nature, the secretory organelles of rat atria contain both chromogranins A and B. Apparently these acidic peptides, which have a widespread distribution in the endocrine system, are co-stored and therefore also co-secreted with ANP.

Volume 38, Issue 6, pp. 845-850, 06/01/1990
Copyright © 1990 by The Histochemical Society


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