Michalides R, van Deemter L, Nusse R, Röpcke G, Boot L
J Virol. 1978 Sep;27(3):551-9. doi: 10.1128/JVI.27.3.551-559.1978.
The involvement of the mouse mammary tumor virus (MTV) in spontaneous and hormone-induced mammary tumors in low-mammary-tumor mouse strains was studied by comparing the amounts of MTV RNA and MTV DNA sequences in mammary tumors and other tissues of mice with an without hormonal treatments. The following results were obtained. (i) Mammary tumors which appeared in C3H mice as a result of an infection with MTV contained more MTV DNA compared with noninfected organs; these mammary tumors also contained more MTV RNA than was present in lactating mammary gland cells. (ii) Hormonal stimulation by administration of excessive amounts of prolactin via hypophyseal isografts in C3Hf and O20 mice resulted in an increased expression of MTV RNA in the mammary glands. This elevated level of MTV RNA expression was, however, not maintained in the hormone-induced mammary tumors. (iii) Spontaneous mammary tumors in BALB/c mice contained similar levels of MTV DNA and MTV RNA sequences as were found in other cells of these animals.
通过比较经激素处理和未经激素处理的小鼠乳腺肿瘤及其他组织中鼠乳腺肿瘤病毒(MTV)RNA和MTV DNA序列的含量,研究了MTV在低乳腺肿瘤小鼠品系的自发性和激素诱导性乳腺肿瘤中的作用。获得了以下结果。(i)因感染MTV而在C3H小鼠中出现的乳腺肿瘤,与未感染的器官相比,含有更多的MTV DNA;这些乳腺肿瘤所含的MTV RNA也比泌乳乳腺细胞中的多。(ii)通过在C3Hf和O20小鼠中经垂体同基因移植给予过量催乳素进行激素刺激,导致乳腺中MTV RNA表达增加。然而,这种MTV RNA表达的升高水平在激素诱导的乳腺肿瘤中并未维持。(iii)BALB/c小鼠的自发性乳腺肿瘤所含的MTV DNA和MTV RNA序列水平与这些动物的其他细胞中发现的相似。