Summary
Specific granules in porcine hearts were observed in atrial cardiocytes, Purkinje fibers, and transitional cells of the ventricle. These granule-containing cells were immunohistochemically stained by applying the avidin-biotin-peroxidase complex method using an antiserum against α-human atrial natriuretic polypeptide (ANP). Immunoelectron microscopy of sections stained using the immunogold method indicated that these specific granules are storage sites of ANP. Furthermore, an impulse-conducting system consisting of immunoreactive cells was clearly distinguishable from nonimmunoreactive ventricular cardiocytes. We conclude that specific-granule-containing cells, i.e., ANP-producing cells, are located in both the atrial walls and the ventricular impulse-conducting system. The presence of ANP may be correlated with impulse conduction.
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Toshimori, H., Toshimori, K., Ōura, C. et al. Immunohistochemistry and immunocytochemistry of atrial natriuretic polypeptide in porcine heart. Histochemistry 86, 595–601 (1987). https://doi.org/10.1007/BF00489553
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DOI: https://doi.org/10.1007/BF00489553