Jinbo Gao

Huazhong University of Science and Technology, Wu-han-shih, Hubei, China

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Publications (6)14.84 Total impact

  • Jinbo Gao, Yuan Tian, Jinghui Zhang
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    ABSTRACT: To investigate the effects of interferon regulatory factor 1 (IRF-1) gene overexpression on chemotherapeutic sensitivity of gastric cancer cells. An AGS cell system with tetracycline-inducible IRF-1 expression (AGS/IRF-1) was established. Quantitative reverse transcription polymerase chain reaction (qRT-PCR) and Western blotting were used to detect the expression of the IRF-1 gene. Chemosensitivity to 5-fluorouracil (5-FU) was assessed by cell proliferation assay and cell apoptosis. IRF-1 mRNA and protein level were significantly increased in AGS/IRF-1 cells induced with tetracycline. Compared with control cells, the growth inhibition rate of cells with IRF-1 overexpression was significantly increased when treated with 5-FU (P<0.01). Treatment with 5 μmol/l 5-FU resulted in 12.6% apoptotic cells, whereas such treatment after overexpression of IRF-1 resulted in 39.4% apoptotic cells. Moreover, more poly(adenosine diphosphate-ribose) polymerase (PARP) cleavage was seen in cells with IRF-1 overexpression. Overexpression of IRF-1 enhanced the chemosensitivity of gastric cancer cells to 5-FU through induction of apoptosis.
    Journal of cancer research and therapeutics 01/2012; 8(1):57-61. · 0.83 Impact Factor
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    ABSTRACT: We have shown that the ectopic expression of Interferon Regulatory Factor 1 (IRF-1) results in human cancer cell death accompanied by the down-regulation of the Inhibitor of Apoptosis Protein (IAP) survivin and the induction of the cyclin-dependent kinase inhibitor p21(WAF1/CIP1). In this report, we investigated the direct role of p21 in the suppression of survivin. We show that IRF-1 down-regulates cyclin B1, cdc-2, cyclin E, E2F1, Cdk2, Cdk4, and results in p21-mediated G1 cell cycle arrest. Interestingly, while p21 directly mediates G1 cell cycle arrest, IRF-1 or other IRF-1 signaling pathways may directly regulate survivin in human cancer cells.
    Cancer letters 12/2011; 319(1):56-65. · 4.86 Impact Factor
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    ABSTRACT: The aim of this study was to investigate the expression of telomere repeat binding factor 1 (TRF1), TRF2 and protection of telomeres 1 (POT1) in gastric cancer and their relationships with clinicopathological features and telomerase activity. In total 36 gastric cancer tissue and paired adjacent normal tissue were analyzed. The mRNA expression of telomere binding proteins TRF1, TRF2 and POT1 were measured using quantitative reverse transcription polymerase chain reaction, and telomerase activity was assessed by the telomeric repeat amplification protocol/enzyme linked immunosorbent assay method. The expression of POT1 was significantly higher in tumor tissue than in adjacent normal tissue (P < 0.001). Levels of TRF2 mRNA were significantly higher in bigger tumors (diameter ≥ 5 cm) than in small tumors (diameter < 5 cm) (P = 0.043). POT1 mRNA transcription levels were higher in tumors with lymph nodes metastases than in those without lymph nodes metastases (P = 0.048). POT1 expression was significantly correlated with tumor stage (P = 0.008). A higher level of expression of POT1 was observed in late-stage tumors (III, IV) than in early stage tumors (I, II). Telomerase activity was significantly higher in gastric cancers than in corresponding normal tissue (P < 0.001). Moreover, POT1 expression was significantly positive correlated with telomerase activity (r = 0.572, P < 0.01). POT1 was overexpressed in gastric cancer and may be associated with stomach carcinogenesis and gastric cancer progression.
    Asia-Pacific Journal of Clinical Oncology 12/2011; 7(4):339-45. · 0.91 Impact Factor
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    ABSTRACT: Primary hepatic carcinoid tumor is rare and poses a challenge for diagnosis and management. We presented a case of primary hepatic carcinoid tumor in a 53-year-old female with a complaint of right upper abdominal pain. Computer tomography scans revealed a hypervascular mass in segment 4 of the liver. An ultrasonography-guided biopsy showed a carcinoid tumor. No other lesions were found by the radiological investigations. Surgery resection was performed and histopathological examination revealed a primary hepatic carcinoid tumor. Three years later, recurrence was found and transcatheter arterial chemoembolization was performed. After transcatheter arterial chemoembolization, the patient has been free of symptom and had no radiological disease progression for over 6 months. Surgical resection combination with transcatheter arterial chemoembolization is effective to offer excellent palliation.
    World Journal of Surgical Oncology 11/2011; 9:151. · 1.09 Impact Factor
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    ABSTRACT: The transcription factor interferon regulatory factor-1 (IRF-1) is induced by many tumor-suppressive stimuli and can mediate antiproliferative and proapoptotic effects in cancer cells. Thus, identifying agents that enhance IRF-1 activity may be an effective approach to cancer therapy. A cell-based screening assay was developed to identify extracts and compounds that could enhance IRF-1 activity, using an IRF-1-dependent luciferase reporter cell line. Through this approach, we identified a natural product extract and a known active component of this extract, baicalein, which causes a marked increase in IRF-1-dependent reporter gene expression and IRF-1 protein, with modulation of known IRF-1 targets PUMA and cyclin D1. Baicalein causes suppression of growth in vitro in multiple cancer cell lines in the low micromolar range. IRF-1 plays a role in this growth suppression as shown by significant resistance to growth suppression in a breast cancer cell line stably transfected with short hairpin RNA against IRF-1. Finally, intraperitoneal administration of baicalein by repeated injection causes inhibition of growth in both xenogeneic and syngeneic mouse models of cancer without toxicity to the animals. These findings indicate that identifying enhancers of IRF-1 activity may have utility in anticancer therapies and that cell-based screening for activation of transcription factors can be a useful approach for drug discovery.
    Molecular Cancer Therapeutics 08/2011; 10(10):1774-83. · 5.60 Impact Factor
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    ABSTRACT: Tankyrase 1, which enhances telomerase access to telomeres, plays an important role in telomere maintenance. The aim of this study was to determine the expression and potential role of tankyrase 1 in gastric cancer development and progression. We examined the expression of tankyrase 1 by RT-PCR and Western blotting, and assessed telomerase activity by TRAP-ELISA method in gastric cancer and adjacent normal tissues. We found that tankyrase 1 expression was significantly up-regulated in gastric cancer tissues compared to normal corresponding tissues. Tankyrase 1 over-expression by gastric cancerous tissue was significantly associated with tumor histology differentiation and tumor stage. Moreover, tankyrase 1 expression was significantly correlation with telomerase activity. Our results indicate that tankyrase 1 over-expression may play an important role in gastric cancer development and progression. Tankyrase 1 may be used as a biomarker of gastric cancer and may serve as a target for cancer therapy.
    Pathology & Oncology Research 04/2011; 17(3):685-90. · 1.56 Impact Factor