Palmiter R D, Carey N H
Proc Natl Acad Sci U S A. 1974 Jun;71(6):2357-61. doi: 10.1073/pnas.71.6.2357.
Synthesis of ovalbumin mRNA is induced and maintained in the avian oviduct by estrogen. When estrogen is rapidly removed from circulation, there is a general involution of the oviduct and an unusually rapid decay of ovalbumin mRNA activity. The kinetics of ovalbumin mRNA decay were not first order; instead, the rate of degradation increased about 10-fold over a 20-hr period after removal of estrogen. These results are in contrast with first-order decay kinetics observed for ovalbumin mRNA in estrogen-stimulated chicks (t(1/2) = about 24 hr) and in cell-free extracts. The degradative response triggered by hormonal withdrawal becomes more rapid between 1 and 4 days of estrogen-stimulated growth. We conclude that in the process of inducing egg-white protein synthesis, estrogen produces a cellular environment in which the egg-white protein mRNAs are relatively stable; removal of estrogen initiates cellular catabolism in a manner that is not understood.
雌激素可诱导并维持禽类输卵管中卵清蛋白mRNA的合成。当雌激素迅速从循环中去除时,输卵管会普遍退化,卵清蛋白mRNA活性也会异常快速衰减。卵清蛋白mRNA衰减的动力学并非一级动力学;相反,在去除雌激素后的20小时内,降解速率增加了约10倍。这些结果与在雌激素刺激的雏鸡(半衰期约为24小时)和无细胞提取物中观察到的卵清蛋白mRNA的一级衰减动力学形成对比。在雌激素刺激生长的1至4天之间,激素撤退引发的降解反应变得更快。我们得出结论,在诱导蛋清蛋白合成的过程中,雌激素产生了一种细胞环境,其中蛋清蛋白mRNA相对稳定;去除雌激素会引发细胞分解代谢,但其方式尚不清楚。