SATB1 promotes the malignant of human non-Hodgkin lymphoma by activating the ribonucleotide reductase small subunit M2 / 中南大学学报(医学版)

To explore the role of the special AT rich sequence binding protein-1 (SATB1) and ribonucleotide reductase M2 (RRM2) in enhancing malignant progression of non-Hodgkin lymphoma (NHL). 
 Methods: A total of 42 NHL and 42 chronic lymphadenitis patients were recruited. The protein expressions of SATB1 and RRM2 in cervical lymph nodes were determined by Western blot. After overexpression of SATB1, siSATB1 or siRRM2, the mRNA levels of SATB1 and RRM2 in cells were analyzed via RT-PCR, the cell proliferation was evaluated via MTT and EdU assays, while the migration and invasion of cells were assessed by transwell assays.
 Results: Compared with chronic lymphadenitis, the expressions of SATB1 and RRM2 in NHL patients were up-regulated. There was positive correlation between SATB1 and RRM2 in NHL patients. RRM2 mRNA level was up-regulated after transfection of SATB1 and down-regulated after transfection of siSATB1. Overexpression of SATB1 increased tumor cell proliferation, migration and invasion, while knockdown of RRM2 reversed those phenomena.
 Conclusion: SATB1 functions as an oncogene and promotes tumor cell proliferation, migration and invasion by up-regulation of RRM2 in NHL.

High Expression of Ribonucleotide Reductase Subunit M2 Correlates with Poor Prognosis of Hepatocellular Carcinoma

BACKGROUND/AIMS: Ribonucleotide reductase subunit M2 (RRM2) catalyzes the production of deoxynucleotide triphosphates, which are necessary for DNA synthesis. RRM2 has been reported to play an active role in tumor progression, and elevated RRM2 levels have been correlated with poor prognosis for colorectal cancer patients. This study aimed to elucidate the prognostic significance of RRM2 protein expression in hepatocellular carcinoma after surgery. METHODS: RRM2 protein expression was evaluated using immunohistochemistry in tumor tissues from 259 hepatocellular carcinoma patients who underwent curative hepatectomy. RESULTS: High RRM2 expression was observed in 210 of 259 patients (81.1%) with hepatocellular carcinomas. High RRM2 expression was significantly associated with viral etiology (p=0.035) and liver cirrhosis (p=0.036). High RRM2 expression was correlated with early recurrence (p=0.004) but not with late recurrence (p=0.144). Logistic regression analysis revealed that high RRM2 expression (p=0.040) and intrahepatic metastasis (p<0.001) were independent predictors of early recurrence. High RRM2 expression unfavorably influenced both shorter recurrence-free survival (p=0.011) and shorter disease-specific survival (p=0.002) and was an independent predictor of shorter disease-specific survival (p=0.008). CONCLUSIONS: High RRM2 protein expression might be a useful marker for predicting early recurrence and may be a marker for poor prognosis of hepatocellular carcinoma after curative hepatectomy.

Ribonucleotide Reductase Subunit M2 Can Be New Molecular Target and Prognostic Biomarker of Hepatocellular Carcinoma

No abstract available.

Overexpression of catalytic subunit M2 in patients with ovarian cancer / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>The formation and growth of tumors are related to the synthesis of the DNA. The enzyme ribonucleotide reductase (RR) is an enzyme that regulates the total rate of DNA synthesis and thus plays a pivotal role in cell growth. Catalytic subunit M2 (RRM2) is the main unit modulating the ribonucleotide reductase enzymatic activity. This study aimed to investigate the expression of RRM2 mRNA and protein in patients with ovarian cancer and its relevance to diagnosis and clinical outcome of the patients.</p><p><b>METHODS</b>RRM2 mRNA levels and protein expression were detected in 98 ovarian specimens with immunohistochemistry and real-time quantitative polymerase chain reaction (PCR). Expression of the RRM2 protein and correlation of the RRM2 gene expression with clinical pathological features were analyzed. The Kaplan-Meier test was used for evaluating RRM2 expression and time to progression and survival. The Cox proportional model was used to analyze the risk factors in prognosis of patients.</p><p><b>RESULTS</b>Positive RRM2 immunostaining was found in 43 of 62 (69.4%) patients with epithelial ovarian cancer, 10 of 15 (66.7%) patients with borderline neoplasm, 4 of 15 (26.7%) patients with benign growths, and none of the normal group. The RRM2 mRNA levels were significantly over expressed in epithelial ovarian cancer (1.722 ± 0.639) and borderline ovarian neoplasms (1.365 ± 0.615), compared to the normal group (0.678 ± 0.446) and benign group (0.828 ± 0.545). Patients with ovarian caner in clinical FIGO-stages III-IV presented higher RRM2 gene expression than those in clinical FIGO-stages I-II. Furthermore, the survival of patients with low RRM2 mRNA level was significantly better than patients with high levels (P < 0.05). By Cox proportional risk model analysis, the risk of mortality of patients with high level expression of RRM2 mRNA was 2.553 times greater than those with low expression.</p><p><b>CONCLUSION</b>RRM2 expression closely correlates with the development of ovarian tumor and may serve as a novel predictive marker for diagnosis and prognosis of the disease.</p>

Effect of cinobufotalin on growth of xenograft of endometrial carcinoma cell line ishikawa in nude mouse and its impact on RRM2 expression / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To investigate the inhibitory effect of cinobufotalin (CBT) on the growth of xenograft endometrial carcinoma cell line ishikawa in nude mice, and its impact on the expression of ribonucleotide reductase subunit M2 (RRM2).</p><p><b>METHODS</b>Eleven nude mice with xenograft were randomly divided into two groups, the CBT group and the control group, which received intra-tumor injection of CBT and saline respectively for one week. The sizes of xenografts were measured before and after the treatment to calculate the inhibition ratio of tumor proliferation; the RRM2-mRNA and protein expressions in tumor tissue were measured by RT-PCR and Western blot respectively.</p><p><b>RESULTS</b>After treatment, the size of xenografts in the CBT group was (0.1314 +/- 0.0304) cm3, which was significantly lower than that in the control group (0.360 0 +/- 0.1145) cm3, (P < 0.05), the tumor proliferation inhibition ratio being 43.46%. The differences of RRM2 mRNA and protein expression levels between the two group were significant (P = 0.019 and P = 0.001).</p><p><b>CONCLUSION</b>CBT significantly inhibits the growth of the xenografts of endometrial carcinoma Ishikawa in nude mice, and the action mechanism is possibly associated with the inhibition on RRM2 expression.</p>

Transcriptional targeting of gene expression in breast cancer by the promoters of protein regulator of cytokinesis 1 and ribonuclease reductase 2

For cancer gene therapy, cancer-specific over-expression of a therapeutic gene is required to reduce side effects derived from expression of the gene in normal cells. To develop such an expression vector, we searched for genes over-expressed and/or specifically expressed in cancer cells using bioinformatics and have selected genes coding for protein regulator of cytokinesis 1 (PRC1) and ribonuclease reductase 2 (RRM2) as candidates. Their cancer-specific expressions were confirmed in both breast cancer cell lines and patient tissues. We compared each promoter's cancer-specific activity in the breast normal and cancer cell lines using the luciferase gene as a reporter and confirmed cancer-specific expression of both PRC1 and RRM2 promoters. To test activities of these promoters in viral vectors, the promoters were also cloned into an adeno-associated viral (AAV) vector containing green fluorescence protein (GFP) as the reporter. The GFP expression levels by these promoters were various depending on cell lines tested and, in MDA-MB-231 cells, GFP activities derived from the PRC1 and RRM2 promoters were as strong as that from the cytomegalovirus (CMV) promoter. Our result showed that a vector containing the PRC1 or RRM2 promoter could be used for breast cancer specific overexpression in gene therapy.

Application of Hemin-Agarose Affinity Chromatography to Enrich Proteome Components of Helicobacter pylori Strain 26695

The whole cell extract of Helicobacter pylori strain 26695 was treated with the hemin-agarose resin and the bound fraction was analyzed by 2-Dimensional electrophoresis. The 2-D-PAGE-displayed spots were eluted and analyzed by matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS). Among the 120 spots processed, 94 protein spots were identified to represent 58 genes. Forty-five protein spots that represented thirty-four genes were newly identified in this study, including iron-containing proteins and hemin-containg proteins such as fumarate reductase, iron-sufur subunit(FrdB), ribonucleoside diphosphate reductase, beta subunit (NrdB), glutamyl-tRNA reductase (HemA), nikel-cobalt-cadnium resistance protein (NccB), and porphobilinogen deaminase (HemC).

Changes in gene expression profiles of hydatidiform mole and choriocarcinoma as compared with trophoblast hyperplasia / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To study the relationship of changes in gene expression profiles of hydatidiform mole and choriocarcinoma with hyperplasia of trophoblasts.</p><p><b>METHODS</b>The differentially expressed genes were analyzed in two pairs of tissues of hydatidiform mole versus normal villi, and in two pairs of normal primary culture trophoblasts versus JAR cell line of chariocarcinoma, using cDNA microarray containing 4096 genes. To confirm the results of cDNA microarray analysis, expressions of some up-regulated genes related to DNA synthesis in normal villi, hydatidiform mole, and 2 choriocarcinoma cell lines (JAR and JEG-3) were examined by immunohistochemistry, immunoblotting and RT-PCR.</p><p><b>RESULTS</b>A total of 89 genes were differentially expressed in all hydatidiform moles, accounting for 2.2% of the genes arrayed. Of the 89 genes, 24 were up-regulated and 65 were down-regulated. Compared with normal primary trophoblasts, there were 433 genes up-regulated and 380 genes down-regulated in JAR cell line. Forty six genes were up-regulated in both hydatidiform mole and choriocarcinoma, while 13 genes were down-regulated. Some genes associated with cell proliferative inhibition were significantly down-regulated, whereas those associated with cell proliferation, malignant transformation, metastasis and drug resistance were highly up-regulated. The expressions of thymidine kinase 1, the small subunit of ribonucleotide reductase (RRM2) were significantly increased in hydatidiform mole, JAR and JEG-3 cells.</p><p><b>CONCLUSION</b>Abnormal expression of genes exists in hydatidiform mole and choriocarcinoma. Hyperplasia of trophoblasts may be related to over-expression of genes coding for synthetic enzymes.</p>