AIM： To investigate the prognostic significance of phosphatase regenerating liver 3 （PRL-3） protein expression in gastric cancer.METHODS： PRL-3 expression in paraffin-embedded tumor specimens from 293 patients wit...AIM： To investigate the prognostic significance of phosphatase regenerating liver 3 （PRL-3） protein expression in gastric cancer.METHODS： PRL-3 expression in paraffin-embedded tumor specimens from 293 patients with gastric cancer was studied retrospectively by immunohistochemistry. Nonoclonal antibody specifically against PRL-3, 3B6, was obtained with hybridoma technique.RESULTS： Positive PRL-3 expression was detected in 43.3% （227 of 293） of gastric cancer cases. High expression of PRL-3 was positively correlated with tumor size, depth of invasion, vascular/lymphatic invasion, lymph node metastasis, high TNM stage and tumor recurrence. Patients with positive PRL-3 expression had a significantly lower 5-year survival rate than those with negative expression （28.3% vs 52.9%, P 〈 0.0001）. Patients who received curative surgery, and with positive PRL-3 expression had a significant shorter overall survival and disease-free disadvantage over patients with negative expression （hazard ratio of 16.7 and 16.6, respectively; P 〈 0.0001 for both）. Multivariate analysis revealed that PRL-3 expression was an independent prognostic indicator for overall and disease-free survival of gastric cancer patients, particularly for survival in TNM stage Ⅲ patients. CONCLUSION： PRL-3 expression is a new independent prognostic indicator to predict the potential of recurrence and survival in patients with gastric cancer at the time of tumor resection,展开更多
In regenerating liver of mice, marked increase of the activity of phosphotyrosyl protein phosphatase (PTPP) in cytosol was observed. The PTPP activity varied with time and reached the highest level between 24 to 48 ho...In regenerating liver of mice, marked increase of the activity of phosphotyrosyl protein phosphatase (PTPP) in cytosol was observed. The PTPP activity varied with time and reached the highest level between 24 to 48 hours after partial hepatectomy. In H22a cells the PTPP activity found in every subcellular fraction was lower than that of the normal liver. The PTPP activity was mostly concentrated in lysosomes of normal liver, but mainly distributed in nucleus, cytosol and microsome of regenerating liver. In H22a cells PTPP activity seemed distribute evenly. Five similar major PTPP peaks (I-V) were obtained on DEAE cellulose chromatography of cytosols from all three of liver cells studied. However, two additional PTPP peaks, a and b, were also obtained from cytosol of liver.展开更多
INTRODUCTIONOnly the liver has the great capability ofregeneration in mammal.Few hepatocytes are inthe phase of division in the normal liver of an adultmammal (including human beings),but theremaining hepatocytes can ...INTRODUCTIONOnly the liver has the great capability ofregeneration in mammal.Few hepatocytes are inthe phase of division in the normal liver of an adultmammal (including human beings),but theremaining hepatocytes can be induced to proliferatequickly by partial hepatectomy (PH),and,to somedegree,they stop dividing and re-differentiate intocells functioning as hepatocytes.This shows展开更多
Background Considerable evidence suggests that phosphatase of regenerating liver-3 （PRL-3） plays multiple roles in cancer metastasis; however, the molecular mechanisms remain largely unknown. The aim of this study w...Background Considerable evidence suggests that phosphatase of regenerating liver-3 （PRL-3） plays multiple roles in cancer metastasis; however, the molecular mechanisms remain largely unknown. The aim of this study was to identify proteins associated with PRL-3-promoted colon cancer metastasis, by comparative proteomic analysis. Methods Proteomes of human colon cancer LoVo cells transfected with PRL-3 gene （LoVo-PRL-3） or empty vector PAcGFP-C3 （LoVo-control） were compared using 2D gel electrophoresis. Proteins that varied significantly in concentration were selected and identified using mass spectrometry. Expression of translationally controlled tumor protein （TCTP） mRNA and protein in LoVo-PRL-3 and LoVo-control cells was detected by real-time PCR and Western blotting. Small interfering RNA （siRNA） targeting TCTP was used for silencing TCTP expression in LoVo-PRL-3 cells. Functional significance of TCTP in PRL-3-promoted colon cancer cell proliferation, migration and invasion was investigated by Cell Counting Kit-8 assay and transwell chamber. Results Seventeen proteins displaying significant and reproducible differences between LoVo-PRL-3 and LoVo-control cells were identified. Ten proteins were upregulated and seven were downregulated in LoVo-PRL-3 cells when compared with LoVo-control cells. Eight identified proteins are associated with distinct steps of tumor metastasis： ubiquitin-like protein ISG15, interleukin-18, TCTP, serpin B5, annexin A3, macrophage-capping protein, ATP-dependent RNA helicase DDX3X, and cathepsin D. Real-time PCR and Western blotting results showed that both TCTP mRNA and protein were significantly increased in LoVo-PRL-3 cells compared to LoVo-control cells. Transfection with TCTP siRNA significantly reduced the expression of both mRNA and protein levels of TCTP in LoVo-PRL-3 cells. Knockdown of TCTP by siRNA inhibited PRL-3-promoted proliferation, migration and invasion of LoVo-PRL-3 cells. Conclusion Our results imply that TCTP might be a mediator of PRL-3-promoted proliferation, migration and invasion of human colon cancer cells.展开更多
Protein tyrosine phosphorylation is a major posttranslational modification used by cells to regulate signal transduction and essentially participate in every aspect of cellular physiologic and pathogenic processes. Th...Protein tyrosine phosphorylation is a major posttranslational modification used by cells to regulate signal transduction and essentially participate in every aspect of cellular physiologic and pathogenic processes. The protein tyrosine phosphatase （PTP） super family of enzymes coordinately function with protein tyrosine kinases in signaling pathways that underlie a broad spectrum of fundamental physiological processes. Abnormal regulation of tyrosine phosphorylation or deregulation of phosphorylation is known to result in neoplastic or non-neoplastic diseases. Having evolved into separate families that are structurally and mechanistically distinct, PTPs have been implicated in a variety of diseases and efforts have been made to seek therapeutic clues from them. The phosphatases of regenerating liver （PRL） PRL-1, PRL-2, PRL-3 （also known as PTP4A1, PTP4A2, and PTP4A3, respectively） constitute a subfamily of the protein tyrosine phosphatases that have been suggested to play a key role in oncogenic and metastatic phenotypes.5 Here we review what is known about this novel class of small, prenylated phosphatases and its value in diagnosis and therapy of solid tumors.展开更多
目的:研究miR495、miR551a干扰质粒对SGC7901胃癌细胞中促肝细胞再生磷酸酶-3(phosphatase of regenerating liver-3,PRL-3)表达的影响,探讨基因干扰在胃癌治疗中的价值.方法:分别体外培养稳定转染后的SGC7901细胞系及未经处理的SGC790...目的:研究miR495、miR551a干扰质粒对SGC7901胃癌细胞中促肝细胞再生磷酸酶-3(phosphatase of regenerating liver-3,PRL-3)表达的影响,探讨基因干扰在胃癌治疗中的价值.方法:分别体外培养稳定转染后的SGC7901细胞系及未经处理的SGC7901细胞系,取对数生长期瘤细胞,0.5mL(1×107/mL)细胞悬液接种于Balb/ca(nu/nu)裸鼠腹腔内,在SPF条件下饲养1mo后处死,观察裸鼠成瘤率、瘤体生长情况及腹膜转移等情况,并行组织病理学检查.取各组部分移植瘤行荧光定量PCR检测,对比各组miR495、miR551a及PRL-3mRNA的相对表达水平.结果:各组裸鼠成瘤率均100%,其中两实验组裸鼠一般情况及生存期均好于对照组.取各组移植瘤行荧光定量PCR检测显示,两实验组裸鼠miRNA表达量显著高于对照组,PRL-3mRNA表达量低于对照组.转染质粒组胃癌迁移能力明显减弱.结论:转染靶向干扰PRL-3表达的miR495、mi551a真核质粒可以明显抑制胃癌细胞体内转移侵袭能力.展开更多
胃癌是世界范围内常见肿瘤之一,因胃癌死亡的患者数占据肿瘤相关死因的第3位.肝再生磷酸酶-3(phosphatase of regenerating liver 3,PRL-3)作为一个新近发现的蛋白酪氨酸磷酸酶,近年来研究发现其在胃癌组织中高表达,在胃癌淋巴转移、腹...胃癌是世界范围内常见肿瘤之一,因胃癌死亡的患者数占据肿瘤相关死因的第3位.肝再生磷酸酶-3(phosphatase of regenerating liver 3,PRL-3)作为一个新近发现的蛋白酪氨酸磷酸酶,近年来研究发现其在胃癌组织中高表达,在胃癌淋巴转移、腹膜转移等发挥重要作用,与胃癌患者预后负相关.其后,越来越多的研究关注其在胃癌发生、发展中的调控机制,以期阐明PRL-3在胃癌发生、发展中的具体调节通路及影响因素.尽管随着研究的不断深入,对于PRL-3在胃癌中的作用机制得到一部分阐释,但对于P R L-3在促进胃癌淋巴转移、腹膜转移等恶性进展及复发的机制仍然不是很清楚,本文即对近年来PRL-3的相关研究进展作一综述.展开更多
目的观察慢病毒介导的sh RNA沉默肝再生磷酸酶-3(PRL-3)基因对结肠癌SW480细胞增殖、侵袭、凋亡的影响。方法实验分组为空白对照组、阴性对照组、转染组。将携带PRL-3 sh RNA的慢病毒载体转染结肠癌SW480细胞,建立稳定沉默PRL-3的细胞株...目的观察慢病毒介导的sh RNA沉默肝再生磷酸酶-3(PRL-3)基因对结肠癌SW480细胞增殖、侵袭、凋亡的影响。方法实验分组为空白对照组、阴性对照组、转染组。将携带PRL-3 sh RNA的慢病毒载体转染结肠癌SW480细胞,建立稳定沉默PRL-3的细胞株,real-time PCR检测转染后PRL-3 m RNA的相对表达水平。采用MTT法、平板克隆形成实验检测转染后细胞增殖能力;采用Transwell侵袭实验、侵袭小室法检测转染后细胞迁移及侵袭能力;采用流式细胞术检测转染后细胞凋亡率变化。结果稳定沉默PRL-3的细胞株构建成功,转染组PRL-3m RNA的相对表达水平低于空白对照组、阴性对照组(P<0.05),空白对照组、阴性对照组比较差异无统计学意义。PRL-3 sh RNA转染SW480细胞72 h后,转染组与空白对照组、阴性对照组比较,细胞增殖能力受到抑制,转染120 h时最明显(P<0.05)。转染组克隆形成能力较空白对照组、阴性对照组下降(P<0.05)。转染组与空白对照组、阴性对照组比较,细胞迁移、侵袭能力下降,凋亡率增加(P<0.05)。结论结肠癌SW480细胞转染PRL-3 sh RNA可减少PRL-3的表达,有效抑制SW480细胞增殖,促进其凋亡,PRL-3可能成为治疗结肠癌的靶基因。展开更多
基金Supported by Grant for Key Technology Research and Development Program 2002BA711A06National Basic Research Priorities Program 973 Project 1998051203the Ministry of Science and Technology of China,and grant H020920030390,from the Beijing Science and Technology Commission
文摘AIM： To investigate the prognostic significance of phosphatase regenerating liver 3 （PRL-3） protein expression in gastric cancer.METHODS： PRL-3 expression in paraffin-embedded tumor specimens from 293 patients with gastric cancer was studied retrospectively by immunohistochemistry. Nonoclonal antibody specifically against PRL-3, 3B6, was obtained with hybridoma technique.RESULTS： Positive PRL-3 expression was detected in 43.3% （227 of 293） of gastric cancer cases. High expression of PRL-3 was positively correlated with tumor size, depth of invasion, vascular/lymphatic invasion, lymph node metastasis, high TNM stage and tumor recurrence. Patients with positive PRL-3 expression had a significantly lower 5-year survival rate than those with negative expression （28.3% vs 52.9%, P 〈 0.0001）. Patients who received curative surgery, and with positive PRL-3 expression had a significant shorter overall survival and disease-free disadvantage over patients with negative expression （hazard ratio of 16.7 and 16.6, respectively; P 〈 0.0001 for both）. Multivariate analysis revealed that PRL-3 expression was an independent prognostic indicator for overall and disease-free survival of gastric cancer patients, particularly for survival in TNM stage Ⅲ patients. CONCLUSION： PRL-3 expression is a new independent prognostic indicator to predict the potential of recurrence and survival in patients with gastric cancer at the time of tumor resection,
文摘In regenerating liver of mice, marked increase of the activity of phosphotyrosyl protein phosphatase (PTPP) in cytosol was observed. The PTPP activity varied with time and reached the highest level between 24 to 48 hours after partial hepatectomy. In H22a cells the PTPP activity found in every subcellular fraction was lower than that of the normal liver. The PTPP activity was mostly concentrated in lysosomes of normal liver, but mainly distributed in nucleus, cytosol and microsome of regenerating liver. In H22a cells PTPP activity seemed distribute evenly. Five similar major PTPP peaks (I-V) were obtained on DEAE cellulose chromatography of cytosols from all three of liver cells studied. However, two additional PTPP peaks, a and b, were also obtained from cytosol of liver.
基金China-France Scientific end Technical Cooperation (No.1996-134)Bioengineering Key Laboratory of Henan Province
文摘INTRODUCTIONOnly the liver has the great capability ofregeneration in mammal.Few hepatocytes are inthe phase of division in the normal liver of an adultmammal (including human beings),but theremaining hepatocytes can be induced to proliferatequickly by partial hepatectomy (PH),and,to somedegree,they stop dividing and re-differentiate intocells functioning as hepatocytes.This shows
文摘Background Considerable evidence suggests that phosphatase of regenerating liver-3 （PRL-3） plays multiple roles in cancer metastasis; however, the molecular mechanisms remain largely unknown. The aim of this study was to identify proteins associated with PRL-3-promoted colon cancer metastasis, by comparative proteomic analysis. Methods Proteomes of human colon cancer LoVo cells transfected with PRL-3 gene （LoVo-PRL-3） or empty vector PAcGFP-C3 （LoVo-control） were compared using 2D gel electrophoresis. Proteins that varied significantly in concentration were selected and identified using mass spectrometry. Expression of translationally controlled tumor protein （TCTP） mRNA and protein in LoVo-PRL-3 and LoVo-control cells was detected by real-time PCR and Western blotting. Small interfering RNA （siRNA） targeting TCTP was used for silencing TCTP expression in LoVo-PRL-3 cells. Functional significance of TCTP in PRL-3-promoted colon cancer cell proliferation, migration and invasion was investigated by Cell Counting Kit-8 assay and transwell chamber. Results Seventeen proteins displaying significant and reproducible differences between LoVo-PRL-3 and LoVo-control cells were identified. Ten proteins were upregulated and seven were downregulated in LoVo-PRL-3 cells when compared with LoVo-control cells. Eight identified proteins are associated with distinct steps of tumor metastasis： ubiquitin-like protein ISG15, interleukin-18, TCTP, serpin B5, annexin A3, macrophage-capping protein, ATP-dependent RNA helicase DDX3X, and cathepsin D. Real-time PCR and Western blotting results showed that both TCTP mRNA and protein were significantly increased in LoVo-PRL-3 cells compared to LoVo-control cells. Transfection with TCTP siRNA significantly reduced the expression of both mRNA and protein levels of TCTP in LoVo-PRL-3 cells. Knockdown of TCTP by siRNA inhibited PRL-3-promoted proliferation, migration and invasion of LoVo-PRL-3 cells. Conclusion Our results imply that TCTP might be a mediator of PRL-3-promoted proliferation, migration and invasion of human colon cancer cells.
文摘Protein tyrosine phosphorylation is a major posttranslational modification used by cells to regulate signal transduction and essentially participate in every aspect of cellular physiologic and pathogenic processes. The protein tyrosine phosphatase （PTP） super family of enzymes coordinately function with protein tyrosine kinases in signaling pathways that underlie a broad spectrum of fundamental physiological processes. Abnormal regulation of tyrosine phosphorylation or deregulation of phosphorylation is known to result in neoplastic or non-neoplastic diseases. Having evolved into separate families that are structurally and mechanistically distinct, PTPs have been implicated in a variety of diseases and efforts have been made to seek therapeutic clues from them. The phosphatases of regenerating liver （PRL） PRL-1, PRL-2, PRL-3 （also known as PTP4A1, PTP4A2, and PTP4A3, respectively） constitute a subfamily of the protein tyrosine phosphatases that have been suggested to play a key role in oncogenic and metastatic phenotypes.5 Here we review what is known about this novel class of small, prenylated phosphatases and its value in diagnosis and therapy of solid tumors.
文摘目的:研究miR495、miR551a干扰质粒对SGC7901胃癌细胞中促肝细胞再生磷酸酶-3(phosphatase of regenerating liver-3,PRL-3)表达的影响,探讨基因干扰在胃癌治疗中的价值.方法:分别体外培养稳定转染后的SGC7901细胞系及未经处理的SGC7901细胞系,取对数生长期瘤细胞,0.5mL(1×107/mL)细胞悬液接种于Balb/ca(nu/nu)裸鼠腹腔内,在SPF条件下饲养1mo后处死,观察裸鼠成瘤率、瘤体生长情况及腹膜转移等情况,并行组织病理学检查.取各组部分移植瘤行荧光定量PCR检测,对比各组miR495、miR551a及PRL-3mRNA的相对表达水平.结果:各组裸鼠成瘤率均100%,其中两实验组裸鼠一般情况及生存期均好于对照组.取各组移植瘤行荧光定量PCR检测显示,两实验组裸鼠miRNA表达量显著高于对照组,PRL-3mRNA表达量低于对照组.转染质粒组胃癌迁移能力明显减弱.结论:转染靶向干扰PRL-3表达的miR495、mi551a真核质粒可以明显抑制胃癌细胞体内转移侵袭能力.
文摘胃癌是世界范围内常见肿瘤之一,因胃癌死亡的患者数占据肿瘤相关死因的第3位.肝再生磷酸酶-3(phosphatase of regenerating liver 3,PRL-3)作为一个新近发现的蛋白酪氨酸磷酸酶,近年来研究发现其在胃癌组织中高表达,在胃癌淋巴转移、腹膜转移等发挥重要作用,与胃癌患者预后负相关.其后,越来越多的研究关注其在胃癌发生、发展中的调控机制,以期阐明PRL-3在胃癌发生、发展中的具体调节通路及影响因素.尽管随着研究的不断深入,对于PRL-3在胃癌中的作用机制得到一部分阐释,但对于P R L-3在促进胃癌淋巴转移、腹膜转移等恶性进展及复发的机制仍然不是很清楚,本文即对近年来PRL-3的相关研究进展作一综述.
文摘目的观察慢病毒介导的sh RNA沉默肝再生磷酸酶-3(PRL-3)基因对结肠癌SW480细胞增殖、侵袭、凋亡的影响。方法实验分组为空白对照组、阴性对照组、转染组。将携带PRL-3 sh RNA的慢病毒载体转染结肠癌SW480细胞,建立稳定沉默PRL-3的细胞株,real-time PCR检测转染后PRL-3 m RNA的相对表达水平。采用MTT法、平板克隆形成实验检测转染后细胞增殖能力;采用Transwell侵袭实验、侵袭小室法检测转染后细胞迁移及侵袭能力;采用流式细胞术检测转染后细胞凋亡率变化。结果稳定沉默PRL-3的细胞株构建成功,转染组PRL-3m RNA的相对表达水平低于空白对照组、阴性对照组(P<0.05),空白对照组、阴性对照组比较差异无统计学意义。PRL-3 sh RNA转染SW480细胞72 h后,转染组与空白对照组、阴性对照组比较,细胞增殖能力受到抑制,转染120 h时最明显(P<0.05)。转染组克隆形成能力较空白对照组、阴性对照组下降(P<0.05)。转染组与空白对照组、阴性对照组比较,细胞迁移、侵袭能力下降,凋亡率增加(P<0.05)。结论结肠癌SW480细胞转染PRL-3 sh RNA可减少PRL-3的表达,有效抑制SW480细胞增殖,促进其凋亡,PRL-3可能成为治疗结肠癌的靶基因。
