目的:探讨SKP2在大肠癌中的表达和预后作用．方法:采用SP免疫组化法检测68例大肠癌手术切除组织标本中SKP2和P27的表达,用Kaplan-Meier和Cox回归分析法进行生存分析．结果:在68例大肠癌组织中,SKP2和P27的阳性表达率分别为41．2％(n=28)...目的:探讨SKP2在大肠癌中的表达和预后作用．方法:采用SP免疫组化法检测68例大肠癌手术切除组织标本中SKP2和P27的表达,用Kaplan-Meier和Cox回归分析法进行生存分析．结果:在68例大肠癌组织中,SKP2和P27的阳性表达率分别为41．2％(n=28)和52．9％(n= 36)．SKP2的表达与组织分级显著相关(X2= 14．073,P=0．001)．SKP2表达与年龄、性别和AJCC分期无关(P>0．05)．SKP2和P27负相关(r=-0．528,P=0．0001)．SKP2高表达组的总生存期较SKP2低表达组短(31．5±4．0 mo vs 54．5±2．1 mo,P<0．01)．多因素Cox回归分析表明,SKP2表达是大肠癌的独立预后因素(RR= 6．227．P=0．033)．结论:SKP2表达可以作为大肠癌患者预后的指标．展开更多
Although Src is one of the oldest and most investigated oncoproteins,its function in tumor malignancy remains to be defined further.In this study,we demonstrated that the inhibition of Src activity by ponatinib effect...Although Src is one of the oldest and most investigated oncoproteins,its function in tumor malignancy remains to be defined further.In this study,we demonstrated that the inhibition of Src activity by ponatinib effectively suppressed several malignant phenotypes of esophageal squamous cell carcinoma(ESCC)both in vitro and in vivo,whereas it did not produce growthinhibitory effects on normal esophageal epithelial cells(NEECs).Importantly,we combined phosphoproteomics and several cellular and molecular biologic strategies to identify that Src interacted with the members of Src-family kinases(SFKs),such as Fyn or Lyn,to form heterodimers.Src interactions with Fyn and Lyn phosphorylated the tyrosine sites in SH2(Fyn Tyr^(185)or Lyn Tyr^(183))and kinase domains(Fyn Tyr^(420) or Lyn Tyr^(397)),which critically contributed to ESCC development.By contrast,Src could not form heterodimers with Fyn or Lyn in NEECs.We used RNA sequencing to comprehensively demonstrate that the inhibition of Src activity effectively blocked several critical tumor-promoting pathways,such as JAK/STAT,mTOR,stemness-related,and metabolism-related pathways.Results of the real-time polymerase chain reaction(RT-PCR)assay confirmed that Lyn and Fyn were critical effectors for the Src-mediated expression of tumor growth or metastasis-related molecules.Furthermore,results of the clinical ESCC samples showed that the hyperactivation of pSrc Tyr^(419),Fyn Tyr^(185) or Tyr^(420),and Lyn Tyr^(183)or Tyr^(397)could be biomarkers of ESCC prognosis.This study illustrates that Src/Fyn and Src/Lyn heterodimers serve as targets for the treatment of ESCC.展开更多
Aberrant activation of Src-family tyrosine kinases （SFKs） directs initiation of metastasis and development of drug resistance in multiple solid tumors and hematological cancers. Since oncogenic mutations of SFKs are...Aberrant activation of Src-family tyrosine kinases （SFKs） directs initiation of metastasis and development of drug resistance in multiple solid tumors and hematological cancers. Since oncogenic mutations of SFKs are rare events, aberrant activation of SFKs in cancer is likely due to dysregulation of the two major upstream inhibitors： C-terminal Src kinase （Csk） and its homolog Csk-homologous kinase （Chk/Matk）. Csk and Chk/Matk inhibit SFKs by selectively phosphorylating the inhibitory tyrosine residue at their C-terminal tail. Additionally, Chk/Matk can also employ a non- catalytic inhibitory mechanism to inhibit multiple active forms of SFKs, suggesting that Chk/Matk is a versatile inhibitor capable of constraining the activity of multiple active forms of SFKs. Mounting evidence suggests that Chk/ Mark is a potential tumor suppressor downregulated by epigenetic silencing and/or missense mutations in several cancers such as colorectal and lung carcinoma. In spite of the potential significance of Chk/Matk in cancer, little is known about its structure and regulation. This review focuses on the mechanisms by which Chk/Matk expression and activity is downregulated in cancers. Specifically, we assessed the evidence demonstrating downregulation of Chk/Matk by epigenetic silencing and missense mutations in cancers. The other focus is the tumor suppressive mechanism of Chk/ Matk. The final focus of the review is on the clinical applications of the investigations into the mechanism of epigenetic silencing of Chk/Matk expression and the tumor suppressive mechanism of Chk/Matk; specifically we discussed how they can benefit the development of biomarkers for early diagnosis of cancers and specific SFK inhibitors for use as cancer therapeutics.展开更多
文摘目的:探讨SKP2在大肠癌中的表达和预后作用．方法:采用SP免疫组化法检测68例大肠癌手术切除组织标本中SKP2和P27的表达,用Kaplan-Meier和Cox回归分析法进行生存分析．结果:在68例大肠癌组织中,SKP2和P27的阳性表达率分别为41．2％(n=28)和52．9％(n= 36)．SKP2的表达与组织分级显著相关(X2= 14．073,P=0．001)．SKP2表达与年龄、性别和AJCC分期无关(P>0．05)．SKP2和P27负相关(r=-0．528,P=0．0001)．SKP2高表达组的总生存期较SKP2低表达组短(31．5±4．0 mo vs 54．5±2．1 mo,P<0．01)．多因素Cox回归分析表明,SKP2表达是大肠癌的独立预后因素(RR= 6．227．P=0．033)．结论:SKP2表达可以作为大肠癌患者预后的指标．
基金supported by the National Natural Science Foundation of China (81988101,81830086 and 81972243)CAMS Innovation Fund for Medical Sciences (2019-I2M-5-081)+2 种基金Major Program of Shenzhen Bay Laboratory (S201101004)Guangdong Basic and Applied Basic Research Foundation (2019B030302012)the Fund of“San-ming”Project of Medicine in Shenzhen (SZSM201812088)。
文摘Although Src is one of the oldest and most investigated oncoproteins,its function in tumor malignancy remains to be defined further.In this study,we demonstrated that the inhibition of Src activity by ponatinib effectively suppressed several malignant phenotypes of esophageal squamous cell carcinoma(ESCC)both in vitro and in vivo,whereas it did not produce growthinhibitory effects on normal esophageal epithelial cells(NEECs).Importantly,we combined phosphoproteomics and several cellular and molecular biologic strategies to identify that Src interacted with the members of Src-family kinases(SFKs),such as Fyn or Lyn,to form heterodimers.Src interactions with Fyn and Lyn phosphorylated the tyrosine sites in SH2(Fyn Tyr^(185)or Lyn Tyr^(183))and kinase domains(Fyn Tyr^(420) or Lyn Tyr^(397)),which critically contributed to ESCC development.By contrast,Src could not form heterodimers with Fyn or Lyn in NEECs.We used RNA sequencing to comprehensively demonstrate that the inhibition of Src activity effectively blocked several critical tumor-promoting pathways,such as JAK/STAT,mTOR,stemness-related,and metabolism-related pathways.Results of the real-time polymerase chain reaction(RT-PCR)assay confirmed that Lyn and Fyn were critical effectors for the Src-mediated expression of tumor growth or metastasis-related molecules.Furthermore,results of the clinical ESCC samples showed that the hyperactivation of pSrc Tyr^(419),Fyn Tyr^(185) or Tyr^(420),and Lyn Tyr^(183)or Tyr^(397)could be biomarkers of ESCC prognosis.This study illustrates that Src/Fyn and Src/Lyn heterodimers serve as targets for the treatment of ESCC.
文摘Aberrant activation of Src-family tyrosine kinases （SFKs） directs initiation of metastasis and development of drug resistance in multiple solid tumors and hematological cancers. Since oncogenic mutations of SFKs are rare events, aberrant activation of SFKs in cancer is likely due to dysregulation of the two major upstream inhibitors： C-terminal Src kinase （Csk） and its homolog Csk-homologous kinase （Chk/Matk）. Csk and Chk/Matk inhibit SFKs by selectively phosphorylating the inhibitory tyrosine residue at their C-terminal tail. Additionally, Chk/Matk can also employ a non- catalytic inhibitory mechanism to inhibit multiple active forms of SFKs, suggesting that Chk/Matk is a versatile inhibitor capable of constraining the activity of multiple active forms of SFKs. Mounting evidence suggests that Chk/ Mark is a potential tumor suppressor downregulated by epigenetic silencing and/or missense mutations in several cancers such as colorectal and lung carcinoma. In spite of the potential significance of Chk/Matk in cancer, little is known about its structure and regulation. This review focuses on the mechanisms by which Chk/Matk expression and activity is downregulated in cancers. Specifically, we assessed the evidence demonstrating downregulation of Chk/Matk by epigenetic silencing and missense mutations in cancers. The other focus is the tumor suppressive mechanism of Chk/ Matk. The final focus of the review is on the clinical applications of the investigations into the mechanism of epigenetic silencing of Chk/Matk expression and the tumor suppressive mechanism of Chk/Matk; specifically we discussed how they can benefit the development of biomarkers for early diagnosis of cancers and specific SFK inhibitors for use as cancer therapeutics.
