Nodal及其受体在不同发育期小鼠组织器官中的表达

Expression of Nodal and its receptors in mouse tissues and organs at different ontogenetic stages

目的研究Nodal生长分化因子(Nodal)及其受体在不同发育期小鼠的不同组织器官中的表达情况。方法将10对(雌雄各一只为一对)小鼠分为4组:3对小鼠作为成年鼠组,剩余7对使其交配,其中3只孕鼠为胎鼠组,3只孕鼠为新生鼠组,1只孕鼠为仔鼠组。分别选取胎鼠、新生鼠、仔鼠、成年鼠的脑、肝、肾、心、肺等全身多种组织器官制备蛋白样品,采用Western blot方法检测Nodal及其Ⅰ型受体激活素受体样激酶(ALK)7、ALK4和辅助受体Cripto-1蛋白的表达。结果仅大脑、小脑、肝脏、肾脏等4种组织器官在小鼠个体发育4个不同时期均有Nodal蛋白表达,其中只有肝和肾在4个发育时期同时表达Nodal及其受体蛋白。此外,与胎鼠、新生鼠和仔鼠3个发育阶段明显不同的是,大多数成年鼠组织器官均表达Nodal及其受体蛋白。结论在小鼠个体发育后期,Nodal信号对肝脏和肾脏器官的生长发育可能具有一定作用。

Objective To investigate the expression of Nodal and its receptors in different tissues and organs of different development stages of mice.Methods Ten pairs(male and female each for a pair)of mice were divided into the four groups:3 pairs served as adult mice group,the rest 7 pairs were allowed to mate,among them 3 pregnant mice served as the fetal group,and 3 pregnant mice served as the neonatal group and 1 pregnant mouse served as filial group.The multiple tissues and organs such as brain,liver,kidney,heart,lung were selected from fetal,neonatal,filial and adult mice for preparing the protein samples.Western blot was performed to detect the expression of Nodal and its typeⅠreceptors of ALK7 and ALK4 as well as auxiliary receptor Cripto-1.Results Only cerebrum,cerebellum,liver and kidney had Nodal express in the four different mouse ontogenetic stages,in which only liver and kidney simultaneously expressed Nodal and its receptor protein in the whole four ontogenetic stages.Besides,most tissues and organs of adult mice expressed Nodal and its receptor protein,which was significantly different from the fetal,neonatal and filial mice.Conclusion Nodal signaling might have a certain effect on the growth and development of mouse liver and kidney during the late development stage.