EGF activates an inducible survival response via the RAS-> Erk-1/2 pathway to counteract interferon-α-mediated apoptosis in epidermoid cancer cells

被引:63
作者
Caraglia, M
Tagliaferri, P
Marra, M
Giuberti, G
Budillon, A
Di Gennaro, E
Pepe, S
Vitale, G
Improta, S
Tassone, P
Venuta, S
Bianco, AR
Abbruzzese, A
机构
[1] Univ Naples 2, Dipartimento Biochim & Biofis, I-80138 Naples, Italy
[2] Univ Magna Grecia Catanzaro, Dipartimento Med Sperimentale, Catanzaro, Italy
[3] Ist Nazl Tumori G Pascale, Naples, Italy
[4] Univ Naples Federico II, Dipartimento Endocrinol & Oncol Mol & Clin, Naples, Italy
关键词
epidermal growth factor receptor; dominant negative Ras; Mek-1; inhibitor; caspases; new anticancer strategies;
D O I
10.1038/sj.cdd.4401131
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The mechanisms of tumor cell resistance to interferon-alpha (IFNalpha) are at present mostly unsolved. We have previously demonstrated that IFNalpha induces apoptosis on epidermoid cancer cells and EGF antagonizes this effect. We have also found that IFNalpha-induced apoptosis depends upon activation of the NH2-terminal Jun kinase-1 (Jnk-1) and p(38) mitogen-activated protein kinase, and that these effects are also antagonized by EGF. At the same time, IFNalpha increases the expression and function of the epidermal growth factor receptor (EGF-R). Here we report that the apoptosis induced by IFNa occurs together with activation of caspases 3, 6 and 8 and that EGF also antagonizes this effect. On the basis of these results, we have hypothesized that the increased EGF-R expression and function could represent an inducible survival response that might protect tumor cells from apoptosis caused by IFNalpha via extracellular signal regulated kinase 1 and 2 (Erk-1/2) cascades. We have found an increased activity of Ras and Raf-1 in IFNalpha-treated cells. Moreover, IFNalpha induces a 50% increase of the phosphorylated isoforms and enzymatic activity of Erk-1/2. We have also demonstrated that the inhibition of Ras activity induced by the transfection of the dominant negative Ras plasmid RASN17 and the inhibition of Mek-1 with PD098059 strongly potentiates the apoptosis induced by IFNalpha. Moreover, the selective inhibition of this pathway abrogates the counteracting effect of EGF on the IFNalpha-induced apoptosis. All these findings suggest that epidermoid tumor cells counteract the IFNalpha-induced apoptosis through a survival pathway that involves the hyperactivation of the EGF-dependent Ras->Erk signalling. The selective targeting of this pathway appears to be a promising approach in order to enhance the antitumor activity of IFNalpha.
引用
收藏
页码:218 / 229
页数:12
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