Tpl-2 kinase downregulates the activity of p53 and enhances signaling pathways leading to activation of activator protein 1 induced by EGF

被引:9
作者
Khanal, Prem [1 ]
Lee, Kwang-Youl [2 ]
Kang, Keon-Wook [1 ]
Kang, Bong Seok [3 ]
Choi, Hong Seok [1 ]
机构
[1] Chosun Univ, Coll Pharm, Kwangju 501759, South Korea
[2] Chonnam Natl Univ, Coll Pharm, Kwangju 500757, South Korea
[3] Kyungpook Natl Univ Hosp, Biomed Res Inst, Taegu 700721, South Korea
关键词
NF-KAPPA-B; T-CELL LINES; HISTONE H3; BREAST-CANCER; COT KINASE; SERINE; 15; PHOSPHORYLATION; GROWTH; TRANSFORMATION; TRANSCRIPTION;
D O I
10.1093/carcin/bgp040
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Tumor progression locus-2 (Tpl-2) kinase is a member of the mitogen-activated protein kinase kinase kinase family that has been implicated in cellular transformation. The enhanced expression of this protein has been shown to activate both the mitogen-activated protein kinase and c-Jun N-terminal kinase pathways. However, the molecular mechanisms responsible for the oncogenic potential of Tpl-2 are still largely unknown. Here, we showed that Tpl-2 interacted with p53 both in vitro and ex vivo. The overexpression of Tpl-2 inhibited the epidermal growth factor (EGF)-induced p53 phosphorylation (Ser15) through upregulating the activity of protein phosphatase 2A, which interacted with p53 stimulated by EGF. Also, the EGF-induced p53 activity was suppressed in the Tpl-2 wild-type (WT)-transfected HEK 293 cells, but had no effect in the Tpl-2-mutant (S413A)-transfected cells. Furthermore, introduction of small interfering RNA-Tpl-2 into HEK 293 cells resulted in decreased cell viability compared with only adenovirus-p53-infected cells. In addition, the Tpl-2 WT, but not Tpl-2 mutant (S413A), showed increased EGF-induced c-fos promoter activity, followed by activator protein 1 (AP-1) transactivation activity, which was associated with the cell transformation prompted by the H-Ras-Tpl-2-AP-1 signaling axis. These results indicated that the Ser413 of Tpl-2 plays an important role in EGF-induced carcinogenesis as well as inactivation of the p53.
引用
收藏
页码:682 / 689
页数:8
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