10 results on '"Zijia Ren"'
Search Results
2. Research on Educational Cognitive Computing Model Based on Problem Solving.
- Author
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Zhijun Yang, Guimei Fan, Weilin Pan, and Zijia Ren
- Published
- 2023
- Full Text
- View/download PDF
3. Targeted Knockdown of EGR-1 Inhibits IL-8 Production and IL-8-mediated Invasion of Prostate Cancer Cells through Suppressing EGR-1/NF-κB Synergy
- Author
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Yinghui Fang, Baolin Sun, Jiajia Ma, Weihua Xiao, Yang Ma, Ting Xue, Lu Xu, Ying Zhao, Chaogu Zheng, and Zijia Ren
- Subjects
Male ,Biology ,Biochemistry ,Metastasis ,Prostate cancer ,DU145 ,Cell Line, Tumor ,Genetic model ,Gene Knockdown Techniques ,medicine ,Animals ,Humans ,Gene silencing ,Neoplasm Invasiveness ,Promoter Regions, Genetic ,Molecular Biology ,Transcription factor ,Early Growth Response Protein 1 ,Gene knockdown ,Interleukin-8 ,Mechanisms of Signal Transduction ,NF-kappa B ,Prostatic Neoplasms ,Genetic Therapy ,Cell Biology ,medicine.disease ,Gene Expression Regulation, Neoplastic ,body regions ,Cancer research ,hormones, hormone substitutes, and hormone antagonists - Abstract
IL-8 produced by prostate cancer cells may be responsible for the androgen-independent growth of advanced prostate cancers. Accumulating evidence from microarray analyses and animal genetic models highlights the central involvement of the transcription factor early growth response-1 (EGR-1) in prostate carcinoma progression. It is unknown, however, whether knockdown of EGR-1 inhibits IL-8 production and IL-8-mediated tumor metastasis. Here we show that EGR-1 knockdown by a specific shRNA-Egr1 inhibited gene transcription and production of IL-8 by the human prostate cancer cell line DU145. Conversely, enforced expression of EGR-1 in EGR-1-lacking PC3 prostate cancer cells markedly enhanced IL-8 transcription and secretion. By using wild type and a series of mutant IL-8 promoter luciferase constructs, we found that the NF-kappaB binding site is important for EGR-1 regulation of IL-8. Furthermore, silencing EGR-1 suppressed a synergistically functional interaction between EGR-1 and NF-kappaB. Consequently, knockdown of EGR-1 inhibited IL-8-mediated tumor colony formation and invasion. Thus, targeted knockdown of EGR-1 could be an effective therapeutic approach against prostate cancer.
- Published
- 2009
4. E2F1 renders prostate cancer cell resistant to ICAM-1 mediated antitumor immunity by NF-κB modulation
- Author
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Lihua Wang, Jiajia Ma, Zijia Ren, Zhigang Tian, Wenyao Kang, Weihua Xiao, Chaogu Zheng, Xiao Yi Yang, Baoliang Sun, and Jie Sun
- Subjects
Male ,endocrine system ,Cancer Research ,ICAM-1 ,Apoptosis ,Biology ,NF-κB ,Small hairpin RNA ,Mice ,Prostate cancer ,NF-KappaB Inhibitor alpha ,Tumor immunity ,Gene Knockdown Techniques ,medicine ,Animals ,Humans ,E2F1 ,Promoter Regions, Genetic ,Regulation of gene expression ,Gene knockdown ,Research ,NF-kappa B ,Prostatic Neoplasms ,Cell cycle ,Intercellular Adhesion Molecule-1 ,medicine.disease ,Xenograft Model Antitumor Assays ,Immunity, Innate ,Gene Expression Regulation, Neoplastic ,IκBα ,Oncology ,Cancer research ,Molecular Medicine ,I-kappa B Proteins ,biological phenomena, cell phenomena, and immunity ,Short hairpin RNA ,E2F1 Transcription Factor ,HeLa Cells - Abstract
Background E2F1 is the gatekeeper of the cell cycle controlling an analogous balance between proliferation and cell death. E2F1 expression is elevated in advanced prostate cancer. However, it is still unclear that the roles and mechanisms of E2F1 on prostate cancers. Methods Targeted knockdown by interferon RNA was applied on two prostate cancer and Hela cell lines to examine the inverse correlation expression of E2F1 and ICAM-1. ICAM-1 promoter reporter and ChIP assays were used for analysis of the molecular basis of transcriptional regulation of E2F1 on ICAM-1. Co-IP assays were employed for testing the protein interaction between E2F1 and NF-κB. Tumor xenograft mice model with E2F1 and ICAM-1-knockdown prostate cancer cells were used to investigate the effects of E2F1 and ICAM-1 on antitumor immunity. Results E2F1 knockdown by a specific short hairpin RNA increased gene transcription and protein expression of ICAM-1. By using wild type and a series of mutant ICAM-1 promoter luciferase constructs, the NF-κB binding sites were found to be important for E2F1 regulation of ICAM-1 promoter. Targeted knockdown of E2F1 did not affect expression and phosphorylation of NF-κB and IκBα, but facilitated NF-κB binding to the ICAM-1 promoter, subsequently induced ICAM-1 transcription and production in prostate carcinoma cells. Furthermore, knockdown of E2F1 inhibited tumor growth of prostate cancer in vivo through increasing the susceptibility of tumor cells to ICAM-1-mediated anti-tumor immunity including enhancement of monocyte adhesion, leucocytes infiltration, as well as cytotoxicity against tumor cells. Conclusions E2F1 knockdown inhibited prostate tumor growth in vitro and in vivo through sensitizing tumor cells to ICAM-1 mediated anti-immunity by NF-κB modulation, highlighting the potential of E2F1 as a therapeutic target.
- Published
- 2014
5. Induction of IGF-1R expression by EGR-1 facilitates the growth of prostate cancer cells
- Author
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Zijia Ren, Jie Sun, Qinqin Cheng, Weihua Xiao, Ying Zhao, Yang Ma, Siyi Hu, and Lu Xu
- Subjects
Male ,Cancer Research ,medicine.medical_specialty ,Chromatin Immunoprecipitation ,Blotting, Western ,Biology ,Receptor, IGF Type 1 ,Prostate cancer ,Internal medicine ,Cell Line, Tumor ,medicine ,Humans ,Extracellular Signal-Regulated MAP Kinases ,Transcription factor ,PI3K/AKT/mTOR pathway ,Cell Proliferation ,Early Growth Response Protein 1 ,Regulation of gene expression ,Gene knockdown ,Binding Sites ,Cell growth ,Reverse Transcriptase Polymerase Chain Reaction ,Prostatic Neoplasms ,medicine.disease ,body regions ,Gene Expression Regulation, Neoplastic ,Endocrinology ,HEK293 Cells ,Oncology ,Cancer research ,Ectopic expression ,RNA Interference ,Signal transduction ,5' Untranslated Regions ,Proto-Oncogene Proteins c-akt ,hormones, hormone substitutes, and hormone antagonists ,Protein Binding ,Signal Transduction - Abstract
The transcription factor Early Growth Response-1 (EGR-1) is overexpressed in human prostate tumors and contributes to prostate cancer progression through an unknown mechanism. Here we report that EGR-1 transcriptionally regulates the expression of insulin-like growth factor-1 receptor (IGF-1R), which is highly expressed in primary prostate cancer. We find that ectopic expression of EGR-1 causes increase in IGF-1R expression, while knockdown of EGR-1 leads to dramatically decrease in IGF-1R expression. Results from chromatin immunoprecipitation (ChIP) and reporter assay show that the EGR-1 directly binds to the human IGF-1R gene and triggers the target gene expression. EGR-1 activates Erk and Akt pathway through regulation of IGF-1R, and thus promote prostate cancer cell growth. Taken together, these results suggest that EGR-1 may stimulate prostate cancer cell growth through up-regulation of IGF-1R and indicate that down-regulation of EGR-1 could be an effective therapeutic approach against prostate cancer.
- Published
- 2011
6. E2F1 Induces tumor cell survival via nuclear factor-kappaB-dependent induction of EGR1 transcription in prostate cancer cells
- Author
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Zhigang Tian, Hetian Wang, Chaogu Zheng, Zijia Ren, Weici Zhang, Weihua Xiao, and Dhananjaya V. Kalvakolanu
- Subjects
Male ,endocrine system ,Cancer Research ,medicine.medical_specialty ,Cell Survival ,E-box ,Apoptosis ,Biology ,Epidermal growth factor ,Internal medicine ,Cell Line, Tumor ,Serum response factor ,medicine ,E2F1 ,Humans ,Growth factor receptor inhibitor ,RNA, Small Interfering ,Promoter Regions, Genetic ,Transcription factor ,PI3K/AKT/mTOR pathway ,Early Growth Response Protein 1 ,Sp1 transcription factor ,NF-kappa B ,Transcription Factor RelA ,Prostatic Neoplasms ,Endocrinology ,Oncology ,Proto-Oncogene Proteins c-bcl-2 ,Drug Resistance, Neoplasm ,Cancer research ,Fluorouracil ,biological phenomena, cell phenomena, and immunity ,E2F1 Transcription Factor - Abstract
Transcription factor E2F1 has been implicated in both apoptosis-promoting and apoptosis-suppressing effects. However, factors that mediate its antiapoptotic effects are still not identified. Using prostate tumor–derived cell lines, we showed here that E2F1 activated the expression of transcription factor EGR1 for promoting cell survival. E2F1 up-regulated the production of EGR1-induced growth factors, epidermal growth factor, platelet-derived growth factor, and insulin-like growth factor II, which in turn activated the phosphoinositide-3-kinase/Akt pathway to resist drug-induced apoptosis. Moreover, E2F1 directly induced the transcription of the Egr1 gene using the κB site located in its proximal promoter. E2F1 physically interacted with the RelA subunit of nuclear factor-κB and modulated its transactivity to fully activate EGR1 transcription. Together, these studies uncovered a novel mechanism for E2F1-induced suppression of apoptosis in prostate cancer. [Cancer Res 2009;69(6):2324–31]
- Published
- 2009
7. Transcription factor E2F1 suppresses dendritic cell maturation. (167.3)
- Author
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Fang Fang, Yan Wang, Rui Li, Ying Zhao, Yang Guo, Ming Jiang, Jie Sun, Yang Ma, Zijia Ren, Zhigang Tian, De Yang, and Weihua Xiao
- Subjects
Immunology ,Immunology and Allergy - Abstract
Recent studies report that transcription factor E2F1 regulates a number of genes in macrophage in response to immune stimulus, and involves in regulating T cell proliferation and differentiation. These studies indicate that E2F1 has impacts on the immune regulation additionally to its roles of regulating cell cycle and apoptosis. Our work shows that during the lipopolysaccharides (LPS) induced dendritic cell (DC) maturation, the level of E2F1 expression was transiently down regulated. The further study showed that knockdown of E2F1 induced both phenotypic and functional maturation in DCs. Conversely, DCs maintained in immature state when E2F1 was ectopically overexpressed. Moreover, E2F1 induced activation of multiple signaling pathways including PI3K, Erk1/2, NF-kappaB, which are generally thought to be involved in DC maturation. Overall, our study demonstrated that E2F1 served as a negative feedback factor to prevent overreaction in DC maturation.
- Published
- 2012
8. E2F1 Suppreses DC Maturation (88.22)
- Author
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Weihua Xiao, Fang Fang, Yan Wang, Rui Li, Ying Zhao, Guo Yang, Ming Jiang, Jie Sun, Yang Ma, Zijia Ren, Zhigang Tian, Wei Feng, and De Yang
- Subjects
Immunology ,Immunology and Allergy - Abstract
E2F1 has been largely studied as a promoter of cell cycle and as regulator of apoptosis. Recently, E2F1 has been shown to regulate a wide range of genes in response to inflammatory stimulation of macrophages and to contribute to T cell activation in response to pathogens, implicating an extensive immunological role for E2F1. Dendritic cells (DCs) play critical roles as professional antigen-presenting cells in the development of immune responses, however, it is unclear whether E2F1 has any effect on DC phenotype and function. Here, we report that E2F1 acts as a suppressor of DC maturation. The level of E2F1 expression was transiently downregulated in the course of LPS-induced maturation of both human monocyte-derived dendritic cells and a mouse DC cell line, DC2.4. Knockdown of E2F1 by siRNA in DC2.4 cells resulted in both phenotypic and functional maturation, even without LPS treatment. Conversely, ectopic overexpression of E2F1 suppressed LPS-induced maturation of DC2.4 cells. Furthermore, knockdown of E2F1 caused the activation of several major signaling pathways known to be activated in the course of DC maturation, including Erk1/2, NF-κB and PI3K/Akt, suggesting that E2F1 may be involved in regulating multiple signaling pathways in DCs. Finally, the alternation by E2F1 on phenotypic maturation was confirmed with bone marrow-derived DCs from E2F1-KO mice. Overall, our data demonstrate for the first time that E2F1 is a critical regulator of dendritic cell maturation.
- Published
- 2010
9. E2F1 renders prostate cancer cell resistant to ICAM-1 mediated antitumor immunity by NF-?B modulation.
- Author
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Zijia Ren, Wenyao Kang, Lihua Wang, Baoliang Sun, Jiajia Ma, Chaogu Zheng, Jie Sun, Zhigang Tian, Xiaoyi Yang, and Weihua Xiao
- Subjects
- *
CANCER cells , *TUMORS , *PROSTATE cancer , *BIOCHEMISTRY , *CELL lines - Abstract
Background E2F1 is the gatekeeper of the cell cycle controlling an analogous balance between proliferation and cell death. E2F1 expression is elevated in advanced prostate cancer. However, it is still unclear that the roles and mechanisms of E2F1 on prostate cancers. Methods Targeted knockdown by interferon RNA was applied on two prostate cancer and Hela cell lines to examine the inverse correlation expression of E2F1 and ICAM-1. ICAM-1 promoter reporter and ChIP assays were used for analysis of the molecular basis of transcriptional regulation of E2F1 on ICAM-1. Co-IP assays were employed for testing the protein interaction between E2F1 and NF-κB. Tumor xenograft mice model with E2F1 and ICAM-1- knockdown prostate cancer cells were used to investigate the effects of E2F1 and ICAM-1 on antitumor immunity. Results E2F1 knockdown by a specific short hairpin RNA increased gene transcription and protein expression of ICAM-1. By using wild type and a series of mutant ICAM-1 promoter luciferase constructs, the NF-κB binding sites were found to be important for E2F1 regulation of ICAM-1 promoter. Targeted knockdown of E2F1 did not affect expression and phosphorylation of NF-κB and I?Ba, but facilitated NF-κB binding to the ICAM-1 promoter, subsequently induced ICAM-1 transcription and production in prostate carcinoma cells. Furthermore, knockdown of E2F1 inhibited tumor growth of prostate cancer in vivo through increasing the susceptibility of tumor cells to ICAM-1-mediated anti-tumor immunity including enhancement of monocyte adhesion, leucocytes infiltration, as well as cytotoxicity against tumor cells. Conclusions E2F1 knockdown inhibited prostate tumor growth in vitro and in vivo through sensitizing tumor cells to ICAM-1 mediated anti-immunity by NF-κB modulation, highlighting the potential of E2F1 as a therapeutic target. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
10. Targeted Knockdown of EGR-1 Inhibits IL-8 Production and IL-8-mediated Invasion of Prostate Cancer Cells through Suppressing EGR-1/NF-κB Synergy.
- Author
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Jiajia Ma, Zijia Ren, Yang Ma, Lu Xu, Ying Zhao, Chaogu Zheng, Yinghui Fang, Ting Xue, Baolin Sun, and Weihua Xiao
- Subjects
- *
INTERLEUKIN-8 , *PROSTATE cancer & genetics , *TRANSCRIPTION factors , *CANCER cell proliferation , *GENE silencing , *NF-kappa B , *BIOLOGICAL transport , *PREVENTION - Abstract
IL-8 produced by prostate cancer cells may be responsible for the androgen-independent growth of advanced prostate cancers. Accumulating evidence from microarray analyses and animal genetic models highlights the central involvement of the transcription factor early growth response-1 (EGR-1) in prostate carcinoma progression. It is unknown, however, whether knockdown of EGR-1 inhibits IL-8 production and IL-8-mediated tumor metastasis. Here we show that EGR-i knockdown by a specific shRNA-Egrl inhibited gene transcription and production of IL-8 by the human prostate cancer cell line DU145. Conversely, enforced expression of EGR-1 in EGR-1-lacking PC3 prostate cancer cells markedly enhanced IL-8 transcription and secretion. By using wild type and a series of mutant IL-8 promoter luciferase constructs, we found that the NF-κB binding site is important for EGR-1 regulation of IL-8. Furthermore, silencing EGR-1 suppressed a synergistically functional interaction between EGR-1 and NF-κB. Consequently, knockdown of EGR-1 inhibited IL-8-mediated tumor colony formation and invasion. Thus, targeted knockdown of EGR-1 could be an effective therapeutic approach against prostate cancer. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
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