Background The MAPK phosphatases （MKPs） are a family of dual-specificity phosphatases （DUSPs） that can dephosphorylate both phosphothreonine and phosphotyrosine residues,thus inactivating MAPK signaling.DUSP6 is a...Background The MAPK phosphatases （MKPs） are a family of dual-specificity phosphatases （DUSPs） that can dephosphorylate both phosphothreonine and phosphotyrosine residues,thus inactivating MAPK signaling.DUSP6 is a cytoplasmic MKP that can inactivate ERK.DUSP6 has been implicated in the development of some tumors.The aim of this research was to investigate the expression of DUSP6 in hepatocellular carcinoma （HCC） and the correlation of DUSP6 with mitogen-activated protein kinases （MAPKs）,clinicopathological characteristics,and prognosis.Methods Tissues from 305 patients who had undergone hepatectomy for HCC was used in this study.The expression of DUSP6,p-ERK,p-JNK,and p-p38a was determined using tissue microarrays for immunohistochemical analysis.The prognostic value of DUSP6 and other clinicopathological factors were evaluated.Results The expression of DUSP6 was significantly higher in the tumor tissue when compared to the peritumor or normal liver tissue （P ＜0.001）.Tumor DUSP6 expression was significantly associated with disease-free survival （DFS） （P=0.013）.Tumor DUSP6 expression was an independent prognostic factor for DFS （Hazard ratio =1.635,P=0.006）.Conclusions DUSP6 is over expressed in tumor tissue compared to peritumor or normal liver tissue.Higher expression of DUSP6 in tumor tissue,than in peritumor tissue,is associated with the recurrence after curative resection of HCC,and the relative tumor DUSP6 expression has good power to predict the recurrence of HCC.展开更多
文摘双特异性磷酸酶3(dual-specificity phosphatase 3,DUSP3)是一种双特异性蛋白酪氨酸磷酸酶,其不仅可使磷酸酪氨酸残基去磷酸化,同时也能使磷酸丝/苏氨酸残基去磷酸化。因此,DUSP3具有多样的底物特异性,除了丝裂原活化蛋白激酶(mitogen-activated protein kinase,MAPK)ERK、JNK和p38底物外,还可以作用于其他信号通路的蛋白质,通过MAPK依赖性或非依赖性机制参与细胞周期调控、细胞增殖、衰老、凋亡、迁移以及血管生成、基因组稳定性等多种生物学反应,与肿瘤的发生发展密切相关,是一个潜在的有价值的治疗靶点。本文就DUSP3的生物学特征及其在肿瘤研究中的进展进行了综述。
文摘Background The MAPK phosphatases （MKPs） are a family of dual-specificity phosphatases （DUSPs） that can dephosphorylate both phosphothreonine and phosphotyrosine residues,thus inactivating MAPK signaling.DUSP6 is a cytoplasmic MKP that can inactivate ERK.DUSP6 has been implicated in the development of some tumors.The aim of this research was to investigate the expression of DUSP6 in hepatocellular carcinoma （HCC） and the correlation of DUSP6 with mitogen-activated protein kinases （MAPKs）,clinicopathological characteristics,and prognosis.Methods Tissues from 305 patients who had undergone hepatectomy for HCC was used in this study.The expression of DUSP6,p-ERK,p-JNK,and p-p38a was determined using tissue microarrays for immunohistochemical analysis.The prognostic value of DUSP6 and other clinicopathological factors were evaluated.Results The expression of DUSP6 was significantly higher in the tumor tissue when compared to the peritumor or normal liver tissue （P ＜0.001）.Tumor DUSP6 expression was significantly associated with disease-free survival （DFS） （P=0.013）.Tumor DUSP6 expression was an independent prognostic factor for DFS （Hazard ratio =1.635,P=0.006）.Conclusions DUSP6 is over expressed in tumor tissue compared to peritumor or normal liver tissue.Higher expression of DUSP6 in tumor tissue,than in peritumor tissue,is associated with the recurrence after curative resection of HCC,and the relative tumor DUSP6 expression has good power to predict the recurrence of HCC.
