鼠胚和新生大鼠心房肌心房肽免疫组织化学研究

用免疫组织化学方法研究了鼠胚和新生大鼠含心房肽免疫反应颗粒的心房肌细胞的发生和分布。结果表明,心房肽免疫反应颗粒出现于胚13天的少数心房肌细胞。随胚胎发育,含免疫反应颗粒的心房肌细胞增多,胞质内反应颗粒也增多,它们主要位于细胞核周围。大部分含反应颗粒的心房肌细胞分布在心房腔侧的小梁内,而在心外膜侧则逐渐减少。无反应颗粒的肌细胞主要位于靠心房外膜侧和房间隔内。本文的结果提示,心房肌细胞的特殊分化在胚胎早期业已开始,在发育过程中,有些细胞分化成心房肽免疫反应阳性细胞,有些细胞仍为心房肽免疫反应阴性。这种分化特点可能与心房的功能发育有关。

AN ATRIOPEPTIN IMMUNOHISTOCHEMICAL STUDY OF ATRIAL MUSCLE CELLS OF RAT EMBRYOS AND NEONATES

The occurrence and distribution of the atrial muscle cells containing atriopeptinimmunoreactive granules were studied in rat embryos and newborn rats with immunohistochemistry. The results showed that immunoreactive granules occurred in a few atrial muscle cells of embryos at 13 days old but they were not found in those cells at 11 and 12 days. With development of the embryos, the number of cells containing immunoreactive granules in atrium increased and their granules became more abundant and located mainly around the nucleus. Most of the granulated atrial muscle cells distributed in trabecular structure of the luminal surface of atria. They gradually decreased in number towards the pericardial side. The nongranulated atrial muscle cells mainly located near the pericardium and in atrial septum. The results suggested that the specific differentiation of atrial muscle cells occurred at early period of rat embryos, some cells became atriopeptin immunoreactive positive cells, while the others remained as negative cells. The feature of the differentiation of atrial muscle cells may reflect the functional development of the atria.