Goodman R, Herschman H R
Proc Natl Acad Sci U S A. 1978 Sep;75(9):4587-90. doi: 10.1073/pnas.75.9.4587.
We have established a clonal cell line, PC-G2, from an experimentally induced rat pheochromocytoma. Administration of nerve growth factor to PC-G2 causes a 4- to 8-fold induction in the specific activity of tyrosine hydroxylase [tyrosine 3-monooxygenase; L-tyrosine,tetrahydropteridine:oxygen oxidoreductase(3-hydroxylating); EC 1.14.16.2]. The response is elicited in a dose-dependent fashion, at concentrations above 0.1 microgram/ml. Antiserum to nerve growth factor inhibited the induction of tyrosine hydroxylase. Dexamethasone enhances the nerve growth factor-mediated elevation of tyrosine hydroxylase. After 3--4 days of exposure to nerve growth factor the maximal induction of tyrosine hydroxylase is seen, although a significant increase can be observed after 24 hr. In contrast to the PC-12 cell line (derived from the same tumor), in which neurite outgrowth occurs in response to nerve growth factor, there is no morphological change or alteration in growth rate of PC-G2 cells after exposure to nerve growth factor.
我们从实验诱导的大鼠嗜铬细胞瘤中建立了一个克隆细胞系PC-G2。向PC-G2细胞系施用神经生长因子会导致酪氨酸羟化酶[酪氨酸3-单加氧酶;L-酪氨酸,四氢蝶呤:氧氧化还原酶(3-羟化);EC 1.14.16.2]的比活性提高4至8倍。在浓度高于0.1微克/毫升时,以剂量依赖方式引发该反应。抗神经生长因子血清抑制酪氨酸羟化酶的诱导。地塞米松增强神经生长因子介导的酪氨酸羟化酶升高。在暴露于神经生长因子3至4天后,可观察到酪氨酸羟化酶的最大诱导,尽管在24小时后即可观察到显著增加。与PC-12细胞系(源自同一肿瘤)不同,PC-12细胞系在暴露于神经生长因子时会发生神经突生长,而PC-G2细胞在暴露于神经生长因子后没有形态变化或生长速率改变。