摘要
目的观察α-横纹肌肌节肌动蛋白(α-SCA)、α-平滑肌肌动蛋白(α-SMA)和中间丝结蛋白在小鼠心脏发育过程中的时空表达特征,以探讨这些蛋白质表达与胚胎及生后小鼠心脏成熟的关系。方法用抗α-SCA、抗α-SMA及抗结蛋白单克隆抗体对胚胎及生后小鼠心脏连续切片进行染色。结果胎龄9 d,心室和流出道α-SCA、α-SMA表达较强,而结蛋白表达较弱。在心房,α-SCA、α-SMA的表达限于背侧壁和腹侧壁,静脉窦仅见少许α-SCA弱阳性细胞。心房和静脉窦则无结蛋白表达。α-SCA、α-SMA和结蛋白的表达于胎龄12 d达高峰。较高水平的α-SCA表达将持续到生后。心脏各部α-SMA和结蛋白表达于胎龄12 d后逐渐下降,但在右心室表达持续时间较长。出生后,结蛋白表达主要集中于明带Z线和闰盘。结论α-SMA和结蛋白在小鼠胚胎心脏表达的时空差异性表明小鼠胚胎心脏不同部位发育成熟的时间有差异,右心室成熟较慢。α-SMA表达可能与早期胚胎心脏的缓慢蠕动收缩有关。肌节的发育成熟需要较高的结蛋白表达。
Objective To investigate the spatiotemporal expression patterns and the relationship of α-sarcomeric actin（α- SCA） ,α-smooth muscle actin（α-SMA） and intermediate filament protein desmin with the maturation of the prenatal and the neonatal mouse hearts.Methods Serial sections of the embryo mouse and the neonatal mouse hearts were immunostained with antibodies against α-SCA, α-SMA and desmin. Results Ventricle and outflow tract of embryonic day（ED） 9 heart showed stronger expression of α-SCA and α-SMA, but desmin expression was lower. In the atrium, the expressions of α-SCA and α-SMA were restricted to the dorsal and ventral walls. In the sinus venosus, only a few weakly stained α-SCA positive cells were detected. No desmin expression was found in the atrium and sinus venosus. The expressions of α-SCA, α-SMA and desmin were increased to their highest level at ED α2. The higher expression of α-SCA remained to the postnatal stages. After ED α2, the expressions of α-SMA and desmin gradually decreased in different parts of the heart, but their expressions in the right ventricle persisted longer. After birth, desmin expression was mainly concentrated in the Z lines of I bands and intercalated disks. Conclusion The presence of spatiotemporal differences in the expression of α-SMA and desmin reveals regional differences in cardiomyocyte maturation in various parts of the embryonic mouse heart. The right ventricle shows a relatively slow pace of maturation. The α-SMA may contribute to a peristaltoid contraction pattern of the embryonic myocardium with a slow shortening speed, and a relatively higher level of desmin is required for the maturation of the sarcomere.
出处
《解剖学报》
CAS
CSCD
北大核心
2005年第4期422-427,共6页
Acta Anatomica Sinica
基金
Scientific researchfoundation for returned overseas Chinese scholars ,state education ministry(1998 ,No.679) ,Education ministry ofShanxi Province(1998 ,No.9845)
