Summary
An immunohistochemical study of atrial natriuretic polypeptides was carried out on embryonic, fetal and neonatal rat hearts, using an antiserum raised against α-human atrial natriuretic polypeptide (α-hANP). Weakly immunoreactive cells were seen in both atrial and ventricular walls at 11 days post coitum (pc). After this stage, the immunoreactive cells became more intensely stained in both atrial and ventricular walls. The immunoreactivity during the prenatal period was stronger in the superficial cell layer beneath the endocardium, than in the deep cell layer of the atrial wall. The cells in the trabecular meshwork also had an apparent, but weak, immunoreactivity, which showed a greater intensity in the left ventricle than in the right one. It is suggested that these immunoreactive cells in the ventricle may differentiate, in situ, into the cells of the impulse-conducting system during the further development of the heart.
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This research was supported in part by Grants-in-Aid for Scientific research to C. Ōura from the Ministry of Education of Japan (Nos. 5957009, 59570010)
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Toshimori, H., Toshimori, K., Ōura, C. et al. Immunohistochemical study of atrial natriuretic polypeptides in the embryonic, fetal and neonatal rat heart. Cell Tissue Res. 248, 627–633 (1987). https://doi.org/10.1007/BF00216493
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DOI: https://doi.org/10.1007/BF00216493