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Wehmeier K, Onstead-Haas LM, Wong NCW, Mooradian AD, Haas MJ. Pro-inflammatory signaling by 24,25-dihydroxyvitamin D3 in HepG2 cells. J Mol Endocrinol 2016; 57:87-96. [PMID: 27234962 DOI: 10.1530/jme-16-0009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 05/27/2016] [Indexed: 12/31/2022]
Abstract
The vitamin D metabolite 24,25-dihydroxyvitamin D3 (24, 25[OH]2D3) was shown to induce nongenomic signaling pathways in resting zone chondrocytes and other cells involved in bone remodeling. Recently, our laboratory demonstrated that 24,25-[OH]2D3 but not 25-hydroxyvitamin D3, suppresses apolipoprotein A-I (apo A-I) gene expression and high-density lipoprotein (HDL) secretion in hepatocytes. Since 24,25-[OH]2D3 has low affinity for the vitamin D receptor (VDR) and little is known with regard to how 24,25-[OH]2D3 modulates nongenomic signaling in hepatocytes, we investigated the capacity of 24,25-[OH]2D3 to activate various signaling pathways relevant to apo A-I synthesis in HepG2 cells. Treatment with 24,25-[OH]2D3 resulted in decreased peroxisome proliferator-activated receptor alpha (PPARα) expression and retinoid-X-receptor alpha (RXRα) expression. Similarly, treatment of hepatocytes with 50 nM 24,25-[OH]2D3 for 1-3 h induced PKCα activation as well as c-jun-N-terminal kinase 1 (JNK1) activity and extracellular-regulated kinase 1/2 (ERK1/2) activity. These changes in kinase activity correlated with changes in c-jun phosphorylation, an increase in AP-1-dependent transcriptional activity, as well as repression of apo A-I promoter activity. Furthermore, treatment with 24,25-[OH]2D3 increased IL-1β, IL-6, and IL-8 expression by HepG2 cells. These observations suggest that 24,25-[OH]2D3 elicits several novel rapid nongenomic-mediated pro-inflammatory protein kinases targeting AP1 activity, increasing pro-inflammatory cytokine expression, potentially impacting lipid metabolism and hepatic function.
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Affiliation(s)
- Kent Wehmeier
- Division of EndocrinologyDiabetes, and Metabolism, Department of Medicine, University of Florida Jacksonville College of Medicine, Jacksonville, Florida, USA
| | - Luisa M Onstead-Haas
- Division of EndocrinologyDiabetes, and Metabolism, Department of Medicine, University of Florida Jacksonville College of Medicine, Jacksonville, Florida, USA
| | - Norman C W Wong
- Department of MedicineBiochemistry and Molecular Biology, University of Calgary, Calgary, Alberta, Canada
| | - Arshag D Mooradian
- Division of EndocrinologyDiabetes, and Metabolism, Department of Medicine, University of Florida Jacksonville College of Medicine, Jacksonville, Florida, USA
| | - Michael J Haas
- Division of EndocrinologyDiabetes, and Metabolism, Department of Medicine, University of Florida Jacksonville College of Medicine, Jacksonville, Florida, USA
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Vartak-Sharma N, Nooka S, Ghorpade A. Astrocyte elevated gene-1 (AEG-1) and the A(E)Ging HIV/AIDS-HAND. Prog Neurobiol 2016; 157:133-157. [PMID: 27090750 DOI: 10.1016/j.pneurobio.2016.03.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 03/11/2016] [Accepted: 03/19/2016] [Indexed: 12/23/2022]
Abstract
Recent attempts to analyze human immunodeficiency virus (HIV)-1-induced gene expression changes in astrocytes uncovered a multifunctional oncogene, astrocyte elevated gene-1 (AEG-1). Our previous studies revealed that AEG-1 regulates reactive astrocytes proliferation, migration and inflammation, hallmarks of aging and CNS injury. Moreover, the involvement of AEG-1 in neurodegenerative disorders, such as Huntington's disease and migraine, and its induction in the aged brain suggest a plausible role in regulating overall CNS homeostasis and aging. Therefore, it is important to investigate AEG-1 specifically in aging-associated cognitive decline. In this study, we decipher the common mechanistic links in cancer, aging and HIV-1-associated neurocognitive disorders that likely contribute to AEG-1-based regulation of astrocyte responses and function. Despite AEG-1 incorporation into HIV-1 virions and its induction by HIV-1, tumor necrosis factor-α and interleukin-1β, the specific role(s) of AEG-1 in astrocyte-driven HIV-1 neuropathogenesis are incompletely defined. We propose that AEG-1 plays a central role in a multitude of cellular stress responses involving mitochondria, endoplasmic reticulum and the nucleolus. It is thus important to further investigate AEG-1-based cellular and molecular regulation in order to successfully develop better therapeutic approaches that target AEG-1 to combat cancer, HIV-1 and aging.
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Affiliation(s)
- Neha Vartak-Sharma
- Department of Cell Biology and Immunology, University of North Texas Health Science Center, Fort Worth, TX, 76107-2699, USA; Institute for Integrated Cell-Material Sciences, Kyoto University, Japan; Institute for Stem Cell Research and Regenerative Medicine, National Center for Biological Sciences, Tata Institute of Fundamental Research, Bangalore, India
| | - Shruthi Nooka
- Department of Cell Biology and Immunology, University of North Texas Health Science Center, Fort Worth, TX, 76107-2699, USA
| | - Anuja Ghorpade
- Department of Cell Biology and Immunology, University of North Texas Health Science Center, Fort Worth, TX, 76107-2699, USA.
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Luo Y, Zhang X, Tan Z, Wu P, Xiang X, Dang Y, Chen G. Astrocyte Elevated Gene-1 as a Novel Clinicopathological and Prognostic Biomarker for Gastrointestinal Cancers: A Meta-Analysis with 2999 Patients. PLoS One 2015; 10:e0145659. [PMID: 26710214 PMCID: PMC4692396 DOI: 10.1371/journal.pone.0145659] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2015] [Accepted: 12/07/2015] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND There have been numerous articles as to whether the staining index (SI) of astrocyte elevated gene-1 (AEG-1) adversely affects clinical progression and prognosis of gastrointestinal cancers. Nevertheless, controversy still exists in terms of correlations between AEG-1 SI and clinicopathological parameters including survival data. Consequently, we conducted a comprehensive meta-analysis to confirm the role of AEG-1 in clinical outcomes of gastrointestinal carcinoma patients. METHODS We performed a comprehensive search in PubMed, ISI Web of Science, Cochrane Central Register of Controlled Trials, EMBASE, Science Direct, Wiley Online Library, China National Knowledge Infrastructure (CNKI), WanFang and Chinese VIP databases. STATA 12.0 (STATA Corp., College, TX) was used to analyze the data extracted from suitable studies and Newcastle-Ottawa Scale was applied to assess the quality of included articles. RESULTS The current meta-analysis included 2999 patients and our results suggested that strong associations emerged between AEG-1 SI and histological differentiation (OR = 2.129, 95%CI: 1.377-3.290, P = 0.001), tumor (T) classification (OR = 2.272, 95%CI: 1.147-4.502, P = 0.019), lymph node (N) classification (OR = 2.696, 95%CI: 2.178-3.337, P<0.001) and metastasis (M) classification (OR = 3.731, 95%CI: 2.167-6.426, P<0.001). Furthermore, high AEG-1 SI was significantly associated with poor overall survival (OS) (HR = 2.369, 95%CI: 2.005-2.800, P<0.001) and deteriorated disease-free survival (DFS) (HR = 1.538, 95%CI: 1.171-2.020, P = 0.002). For disease-specific survival (DSS) and relapse-free survival (RFS), no statistically significant results were observed (HR = 1.573, 95%CI: 0.761-3.250, P = 0.222; HR = 1.432, 95%CI: 0.108-19.085, P = 0.786). Subgroup analysis demonstrated that high AEG-1 SI was significantly related to poor prognosis in esophageal squamous cell carcinoma (ESCC) (HR = 1.715, 95%CI: 1.211-2.410, P = 0.002), gastric carcinoma (GC) (HR = 2.255, 95%CI: 1.547-3.288, P<0.001), colorectal carcinoma (CRC) (HR = 2.922, 95%CI: 1.921-4.444, P<0.001), gallbladder carcinoma (GBC) (HR = 3.047, 95%CI: 1.685-5.509, P<0.001), hepatocellular carcinoma (HCC) (HR = 2.245, 95%CI: 1.620-3.113, P<0.001), pancreatic adenocarcinoma (PAC) (HR = 2.408, 95%CI: 1.625-3.568, P<0.001). CONCLUSIONS The current meta-analysis indicated that high AEG-1 SI might be associated with tumor progression and poor survival status in patients with gastrointestinal cancer. AEG-1 might play a vital role in promoting tumor aggression and could serve as a potential target for molecular treatments. Further clinical trials are needed to validate whether AEG-1 SI provides valuable insights into improving treatment decisions.
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Affiliation(s)
- Yihuan Luo
- Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, People’s Republic of China
| | - Xin Zhang
- Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, People’s Republic of China
| | - Zhong Tan
- Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, People’s Republic of China
| | - Peirong Wu
- Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, People’s Republic of China
| | - Xuelian Xiang
- Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, People’s Republic of China
| | - Yiwu Dang
- Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, People’s Republic of China
| | - Gang Chen
- Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, People’s Republic of China
- * E-mail:
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Li Q, Yin X, Wang W, Zhan M, Zhao B, Hou Z, Wang J. The effects of buthionine sulfoximine on the proliferation and apoptosis of biliary tract cancer cells induced by cisplatin and gemcitabine. Oncol Lett 2015; 11:474-480. [PMID: 26870236 DOI: 10.3892/ol.2015.3879] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 09/04/2015] [Indexed: 02/07/2023] Open
Abstract
Patients with biliary tract cancer (BTC) have a poor prognosis. Advanced BTC patients have been treated with cisplatin in combination with gemcitabine, however, the treatment has had little impact on survival rates, and more effective treatments are urgently required for this disease. Previous studies discovered that buthionine sulfoximine (BSO), a potent inhibitor of glutathione (GSH) synthesis, was able to enhance the cytotoxic effect of various drugs in cancer cells. Phase I studies demonstrated that continuous-infusion of BSO was relatively non-toxic and resulted in the depletion of tumor GSH. However, the synergistic effect of BSO and cisplatin in BTC cells remains unknown, and no reports are available regarding sensitization to gemcitabine by BSO. In the present study, the effect of BSO in combination with cisplatin or gemcitabine in the treatment of BTC cells was examined in vitro. Cytotoxic effects were measured using an MTT assay, Annexin V assay and fluorescence-activated cell sorting analysis. Antiapoptotic protein expression levels were examined using western blot analysis. The results revealed that a sub-toxic concentration of BSO was capable of significantly enhancing cisplatin-induced apoptosis in BTC cells. The mechanisms of BSO's effect on BTC cells may be attributable to the reduction of GSH levels and downregulation of the expression of antiapoptotic proteins (Bcl-2, Bcl-xL and Mcl-1). Furthermore, BSO enhanced the antiproliferative effect of gemcitabine. In conclusion, the present data are the first results to indicate that BSO may sensitize BTC cells to standard first-line chemotherapeutic agents (cisplatin and gemcitabine). Combining BSO with cisplatin and gemcitabine is a promising therapeutic strategy for the treatment of BTC.
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Affiliation(s)
- Qiwei Li
- Department of Biliary-Pancreatic Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R. China
| | - Xiaobin Yin
- Department of Biliary-Pancreatic Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R. China
| | - Wei Wang
- Department of Biliary-Pancreatic Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R. China
| | - Ming Zhan
- Department of Biliary-Pancreatic Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R. China
| | - Benpeng Zhao
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Institutes of Medical Sciences, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, P.R. China
| | - Zhaoyuan Hou
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Institutes of Medical Sciences, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, P.R. China
| | - Jian Wang
- Department of Biliary-Pancreatic Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R. China
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ZHU HAIDAN, LIAO JIAZHI, HE XINGXING, LI PEIYUAN. The emerging role of astrocyte-elevated gene-1 in hepatocellular carcinoma (Review). Oncol Rep 2015; 34:539-46. [PMID: 26035424 DOI: 10.3892/or.2015.4024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 05/08/2015] [Indexed: 11/05/2022] Open
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Jung HI, Ahn T, Bae SH, Chung JC, Kim H, Chin S, Jeong D, Cho HD, Lee MS, Kim HC, Kim CH, Baek MJ. Astrocyte elevated gene-1 overexpression in hepatocellular carcinoma: an independent prognostic factor. Ann Surg Treat Res 2015; 88:77-85. [PMID: 25692118 PMCID: PMC4325651 DOI: 10.4174/astr.2015.88.2.77] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 09/05/2014] [Accepted: 09/11/2014] [Indexed: 01/27/2023] Open
Abstract
PURPOSE Astrocyte elevated gene-1 (AEG-1) plays important roles in tumorigenesis such as proliferation, invasion, metastasis, angiogenesis, and chemoresistance. We examined the expression of AEG-1 in patients with hepatocellular carcinoma (HCC). METHODS Eighty-five samples were collected from patients with HCC who underwent surgery and were histopathologically confirmed to have HCC. Two independent pathologists, experienced in evaluating immunohistochemistry and blinded to the clinical outcomes of the patients, reviewed all samples. They determined AEG-1 expression semiquantitatively by assessing the percentage of positively stained immunoreactive cells and staining intensity. Clinicopathological data were analyzed in association with prognosis. RESULTS The association was estimated by univariate and multivariate analyses with Cox regression. Tumor size (hazard ratio [HR], 2.285; 95% confidence interval [CI], 1.175-4.447; P = 0.015), microvascular invasion (HR, 6.754; 95% CI, 1.631-27.965; P = 0.008), and AEG-1 expression (HR, 4.756; 95% CI, 1.697-13.329; P = 0.003) were independent prognostic factors for overall survival. Those for disease-free survival rate were tumor size (HR, 2.245; 95% CI, 1.282-3.933; P = 0.005) and AEG-1 expression (HR, 1.916; 95% CI, 1.035-3.545; P = 0.038). The cumulative 5-year survival and recurrence rates were 89.2% and 50.0% in the low-expressing group and 24.5% and 82.4% in the high-expressing group, respectively. CONCLUSION The results suggest that AEG-1 overexpression could serve as a valuable prognostic marker in patients with HCC.
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Affiliation(s)
- Hae Il Jung
- Department of Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea
| | - Taesung Ahn
- Department of Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea
| | - Sang Ho Bae
- Department of Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea
| | - Jun Chul Chung
- Department of Surgery, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Hyungjoo Kim
- Department of Medical Science Research Institute, Soonchunhyang University, Cheonan, Korea
| | - Susie Chin
- Department of Pathology, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Dongjun Jeong
- Department of Medical Science Research Institute, Soonchunhyang University, Cheonan, Korea
| | - Hyon Doek Cho
- Department of Pathology, Soonchunhyang University Cheonan Hospital, Cheonan, Korea
| | - Moon Soo Lee
- Department of Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea
| | - Hyung Chul Kim
- Department of Surgery, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Chang Ho Kim
- Department of Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea
| | - Moo-Jun Baek
- Department of Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea
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Wang P, Yin B, Shan L, Zhang H, Cui J, Zhang M, Song Y. RNA interference-mediated knockdown of astrocyte elevated gene-1 inhibits growth, induces apoptosis, and increases the chemosensitivity to 5-fluorouracil in renal cancer Caki-1 cells. Mol Cells 2014; 37:857-64. [PMID: 25431427 PMCID: PMC4275702 DOI: 10.14348/molcells.2014.0081] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Revised: 08/18/2014] [Accepted: 09/18/2014] [Indexed: 12/14/2022] Open
Abstract
Astrocyte elevated gene-1 (AEG-1) is a recently discovered oncogene that has been reported to be highly expressed in various types of malignant tumors, including renal cell carcinoma. However, the precise role of AEG-1 in renal cancer cell proliferation and apoptosis has not been clarified. In this study, we transfected the renal cancer cell line Caki-1 with a plasmid expressing AEG-1 short hairpin RNA (shRNA) and obtained cell colonies with stable knockdown of AEG-1. We found that AEG-1 down-regulation inhibited cell proliferation and colony formation and arrested cell cycle progression at the sub-G1 and G0/G1 phase. Western blot analysis indicated that the expression of proliferating cell nuclear antigen (PCNA), cyclin D1 and cyclin E were significantly reduced following AEG-1 down-regulation. In addition, AEG-1 knockdown led to the appearance of apoptotic bodies in renal cancer cells, and the ratio of apoptotic cells significantly increased. Expression of the anti-apoptotic factor Bcl-2 was dramatically reduced, whereas the pro-apoptotic factors Bax, caspase-3 and poly (ADP-ribose) polymerase (PARP) were significantly activated. Finally, AEG-1 knockdown in Caki-1 cells remarkably suppressed cell proliferation and enhanced cell apoptosis in response to 5-fluorouracil (5-FU) treatment, suggesting that AEG-1 inhibition sensitizes Caki-1 cells to 5-FU. Taken together, our data suggest that AEG-1 plays an important role in renal cancer formation and development and may be a potential target for future gene therapy for renal cell carcinoma.
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Affiliation(s)
- Peng Wang
- The Second Department of Urology, Shengjing Hospital of China Medical University, Shenyang 110004,
People’s Republic of China
| | - Bo Yin
- The Second Department of Urology, Shengjing Hospital of China Medical University, Shenyang 110004,
People’s Republic of China
| | - Liping Shan
- The Second Department of Urology, Shengjing Hospital of China Medical University, Shenyang 110004,
People’s Republic of China
| | - Hui Zhang
- The Second Department of Urology, Shengjing Hospital of China Medical University, Shenyang 110004,
People’s Republic of China
| | - Jun Cui
- The Second Department of Urology, Shengjing Hospital of China Medical University, Shenyang 110004,
People’s Republic of China
| | - Mo Zhang
- The Second Department of Urology, Shengjing Hospital of China Medical University, Shenyang 110004,
People’s Republic of China
| | - Yongsheng Song
- The Second Department of Urology, Shengjing Hospital of China Medical University, Shenyang 110004,
People’s Republic of China
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