Zoon K C, Karasaki Y, zur Nedden D L, Hu R Q, Arnheiter H
Proc Natl Acad Sci U S A. 1986 Nov;83(21):8226-30. doi: 10.1073/pnas.83.21.8226.
Treatment of Madin-Darby bovine kidney (MDBK) cells with human interferon (IFN)-alpha 2 at 37 degrees C results in a dose-dependent inhibition of cell growth and a reduction of the subsequent binding of 125I-labeled epidermal growth factor (EGF) at 4 degrees C. Human IFN-beta and -gamma, which exhibit little antiviral and antiproliferative activities on MDBK cells, have little effect on cell growth or the binding of 125I-labeled EGF to these cells. The binding of EGF is decreased after exposure to IFN-alpha for greater than 8 hr. Scatchard analyses of the EGF binding data indicate that a 20-hr exposure period results in a decrease in the apparent number of cell-surface EGF receptors and a reduction in the affinity of EGF for its receptor. The rate of internalization of EGF by MDBK cells does not appear to be affected by IFN treatment.
在37摄氏度下用人干扰素(IFN)-α2处理马-达二氏牛肾(MDBK)细胞,会导致细胞生长受到剂量依赖性抑制,且在4摄氏度下125I标记的表皮生长因子(EGF)的后续结合减少。人IFN-β和-γ对MDBK细胞几乎没有抗病毒和抗增殖活性,对细胞生长或125I标记的EGF与这些细胞的结合几乎没有影响。暴露于IFN-α超过8小时后,EGF的结合减少。对EGF结合数据的Scatchard分析表明,20小时的暴露期会导致细胞表面EGF受体的表观数量减少,以及EGF对其受体的亲和力降低。MDBK细胞内化EGF的速率似乎不受IFN处理的影响。