Summary
The spatiotemporal distribution of the immunoreactivity of monoclonal antibody HNK-1 was investigated immunohistochemically in normal and bis-diamine-induced malformed rat embryonic hearts using three-dimensional reconstruction with computer graphics. First recognized in the primitive heart 11.5 days after conception, HNK-1 immunoreactivity was distributed in the atrio-ventricular and bulbo-ventricular junctional areas with incomplete ring-like appearance in the early embryonic stages. In the late embryonic stages the immunoreactive sites were rearranged and localized in the sites topographically corresponding to almost the entire pathway of the conduction system, including the three major internodal tracts connecting the right sinoatrial node and atrioventricular node. Immunoreactivity gradually decreased after the completion of the conduction system, and only a faint reactivity in the atrio-ventricular node region remained in the new-born heart. These results indicate that HNK-1 is expressed temporarily in the pathways corresponding to the conduction system during the development of the heart. In bis-(dichloro-acethyl)-octamethylen-diamine (bis-diamine)-induced malformed hearts, localization of HNK-1 immunoreactivity was not remarkably altered in the early embryonic heart. In the late embryo, immunoreactive sites in the sino-atrial node region and atrio-ventricular node region deviated dorsocaudally with the poorly developed internodal tracts, and abnormal distribution was observed in the bilateral atria. We consider that these abnormalities may occur in conjunction with abnormal morphological development such as insufficient absorption of the sinus venosus.
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Ito, H., Iwasaki, K., Ikeda, T. et al. HNK-1 expression pattern in normal and bis-diamine induced malformed developing rat heart: three dimensional reconstruction analysis using computer graphics. Anat Embryol 186, 327–334 (1992). https://doi.org/10.1007/BF00185981
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DOI: https://doi.org/10.1007/BF00185981