scholarly journals Prostaglandin Reductase 2 Modulates ROS-Mediated Cell Death and Tumor Transformation of Gastric Cancer Cells and Is Associated with Higher Mortality in Gastric Cancer Patients

2012 ◽  
Vol 181 (4) ◽  
pp. 1316-1326 ◽  
Author(s):  
Emily Yun-Chia Chang ◽  
Shu-Huei Tsai ◽  
Chia-Tung Shun ◽  
Siow-Wey Hee ◽  
Yi-Cheng Chang ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cell Death ◽  
Cancer Cells ◽  
Cancer Patients ◽  
Gastric Cancer Cells ◽  
Tumor Transformation ◽  
Gastric Cancer Patients

scholarly journals Down-regulation of HIF-1α inhibits the proliferation, migration, and invasion of gastric cancer by inhibiting PI3K/AKT pathway and VEGF expression

2018 ◽  
Vol 38 (6) ◽  
Author(s):  
Jingjing Zhang ◽  
Jun Xu ◽  
Yonghong Dong ◽  
Bo Huang
Keyword(s):  
Gastric Cancer ◽  
Cancer Cells ◽  
Cancer Patients ◽  
Akt Pathway ◽  
Migration And Invasion ◽  
Vegf Expression ◽  
Gastric Cancer Cells ◽  
Tumor Tissues ◽  
Sirna Silencing ◽  
Gastric Cancer Patients

In view of the high incidence of gastric cancer and the functions of hypoxia-inducible factor 1α (HIF-1α), our study aimed to investigate the functionality of HIF-1α in gastric cancer, and to explore the diagnostic and prognostic values of HIF-1α for this disease. Expression of HIF-1α in tumor tissues and adjacent healthy tissues as well as serum collected from both gastric cancer patients and normal healthy controls was detected by qRT-PCR. Survival analysis was performed using Kaplan–Meier method. HIF-1α siRNA silencing cell lines were established. Effects of HIF-1α siRNA silencing as well as PI3K activator sc3036 on proliferation, migration, and invasion of gastric cancer cells were detected by Cell counting kit (CCK-8) assay, and Transwell migration and invasion assay. Effects of HIF-1α siRNA silencing on AKT and VEGF were detected by Western blot. Expression of HIF-1α was significantly down-regulated in tumor tissues than in adjacent healthy tissues in most gastric cancer patients. Serum levels of HIF-1α were also higher in gastric cancer patients than in normal healthy people. Serum HIF-1α showed promising diagnostic and prognostic values for gastric cancer. HIF-1α siRNA silencing inhibited the proliferation, migration, and invasion of gastric cancer cells, while PI3K activator sc3036 treatment reduced those inhibitory effects. Down-regulation of HIF-1α can inhibit the proliferation, migration, and invasion of gastric cancer possibly by inhibiting PI3K/AKT pathway and VEGF expression.

scholarly journals UFM1 suppresses invasive activities of gastric cancer cells by attenuating the expression of PDK1 through PI3K/AKT signaling

2019 ◽  
Vol 38 (1) ◽  
Author(s):  
Jian-Xian Lin ◽  
Xin-Sheng Xie ◽  
Xiong-Feng Weng ◽  
Sheng-Liang Qiu ◽  
Changhwan Yoon ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cancer Cells ◽  
Cancer Patients ◽  
Molecular Mechanisms ◽  
Akt Signaling ◽  
Invasion And Metastasis ◽  
Gastric Cancer Cells ◽  
Invasion And Migration ◽  
And Migration ◽  
Gastric Cancer Patients

Abstract Background UFM1 has been found to be involved in the regulation of tumor development. This study aims to clarify the role and potential molecular mechanisms of UFM1 in the invasion and metastasis of gastric cancer. Methods Expression of UFM1 in gastric tumor and paired adjacent noncancerous tissues from 437 patients was analyzed by Western blotting, immunohistochemistry, and realtime PCR. Its correlation with the clinicopathological characteristics and prognosis of gastric cancer patients was analyzed. The effects of UFM1 on the invasion and migration of gastric cancer cells were determined by the wound and trans-well assays, and the effect of UFM1 on subcutaneous tumor formation was verified in nude mice. The potential downstream targets of UFM1 and related molecular mechanisms were clarified by the human protein kinase assay and co-immunoprecipitation technique. Results Compared with the corresponding adjacent tissues, the transcription level and protein expression level of UFM1 in gastric cancer tissues were significantly downregulated (P < 0.05). The 5-year survival rate of gastric cancer patients with low UFM1 expression was significantly lower than the patients with high UFM1 expression (42.1% vs 63.0%, P < 0.05). The invasion and migration abilities of gastric cancer cells with stable UFM1 overexpression were significantly decreased, and the gastric cancer cells with UFM1 stable knockdown showed the opposite results; similar results were also obtained in the nude mouse model. Further studies have revealed that UFM1 could increase the ubiquitination level of PDK1 and decrease the expression of PDK1 at protein level, thereby inhibiting the phosphorylation level of AKT at Ser473. Additionally, the effect of UFM1 on gastric cancer cell function is dependent on the expression of PDK1. The expression level of UFM1 can improve the poor prognosis of PDK1 in patients with gastric cancer. Conclusion UFM1 suppresses the invasion and metastasis of gastric cancer by increasing the ubiquitination of PDK1 through negatively regulating PI3K/AKT signaling.

scholarly journals Malic enzyme 1 (ME1) is a potential oncogene in gastric cancer cells and is associated with poor survival of gastric cancer patients

2019 ◽  
Vol Volume 12 ◽  
pp. 5589-5599
Author(s):  
Yanyan Shi ◽  
Siliang Zhou ◽  
Pan Wang ◽  
Yanlei Guo ◽  
Bingteng Xie ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cancer Cells ◽  
Cancer Patients ◽  
Malic Enzyme ◽  
Poor Survival ◽  
Gastric Cancer Cells ◽  
Gastric Cancer Patients

Regulation of miR-596 on the Apoptosis of Gastric Cancer Cells through Its Targeting Inhibition of BCL-2

2020 ◽  
Author(s):  
Jianmiao WANG ◽  
Jing YANG ◽  
Ji QIU ◽  
Taoyan SONG
Keyword(s):  
Gastric Cancer ◽  
Cancer Cells ◽  
Cancer Patients ◽  
Mechanism Of Action ◽  
Gastric Cancer Cell ◽  
Gastric Cancer Cells ◽  
Gastric Cancer Cell Lines ◽  
Gastric Cancer Patients ◽  
Cancer Tissues ◽  
The Relationship

Background: We aimed to investigate the relationship between miR-596, BCL-2, and apoptosis of gastric cancer cells, and to explore the mechanism of miR-596 in gastric cancer. Besides, this study aimed to find the target of miR-596 and explore the mechanism of action of miR-596 in gastric cancer. Methods: Eighteen samples of gastric cancer tissues and 18 samples of corresponding tumor-adjacent tissues were collected from 18 gastric cancer patients (aged from 40 to 55 yr) admitted to Zhuji People's Hospital, Zhuji, China from March 2017 to May 2018. The expression levels of miR-596 and BCL-2 were detected to verify the regulation of miR-596 on the apoptosis and proliferation of gastric cancer cell lines MKN-45 and HGC-27 and its effect on BCL-2 expression. Results: The expression level of miR-596 was notably lower in gastric cancer tissues than in adjacent tissues, and BCL-2 level was notably higher in gastric cancer tissues than in adjacent tissues. After the up-regulation of miR-596 expression, the proliferation of MKN-45 and HGC-27 cells was significantly decreased, the level of apoptosis was significantly increased (P<0.05), and the expression of BCL-2 was decreased. The dual-luciferase report showed that miR-596 had a targeting inhibition of BCL-2. Gastric cancer cells with up-regulated miR596 and BCL-2 had significantly higher proliferation and lower apoptosis than cells with up-regulated miR-596. Conclusions: miR-596 can inhibit the proliferation of gastric cancer cells and promote the apoptosis through its targeting inhibition of BCL-2 expression.

scholarly journals Tenascin-c Knockdown Suppresses Vasculogenic Mimicry of Gastric Cancer by Inhibiting ERK- Triggered EMT

2021 ◽  
Author(s):  
Xing Kang ◽  
en xu ◽  
Xingzhou wang ◽  
Lulu Qian ◽  
Zhi Yang ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cancer Cells ◽  
Cancer Patients ◽  
Vasculogenic Mimicry ◽  
Gastric Cancer Cells ◽  
Tenascin C ◽  
Gastric Cancer Patients ◽  
Cancer Tissues

Abstract BackgroundGastric cancer is one of the most common malignancies worldwide and vasculogenic mimicry (VM) is considered to be the leading cause for the failure of anti-angiogenesis therapy in advanced gastric cancer patients. Tenascin-c (TNC) plays a pivotal role in VM. Thus, we explored the role of TNC in VM formation in gastric cancer.MethodsGastric cancer tissues and corresponding adjacent tissues were collected from gastric cancer patients after surgery. We used western blot and immunohistochemistry to examine the expression of TNC in tissues and used siRNA and lentivirus to knockdown the TNC expression in gastric cancer cell lines. Then three-dimensional culturing, CCK-8, Edu assay, flow cytometry, trasnwell and pseudopodia formation assay were used to evaluate the function of TNC in gastric cancer cells and bioinformatic prediction was used to explore the mechanism underlying TNC modulating the VM in gastric cancer. Xenograft and peritoneal dissemination model were used to further explore the role of TNC in vivo.ResultsIn this study, we demonstrated that TNC was highly expressed in gastric cancer tissues and correlated with poor prognosis of gastric cancer. Furthermore, knockdown of TNC significantly inhibited VM formation and proliferation of gastric cancer cells in vitro and in vivo, with a reduction in cell migration and invasion. Mechanistically, TNC knockdown suppressed the phosphorylation of ERK and subsequently inhibited the process of EMT, both of which play an important role in VM formation. What’s more, rescue experiments showed that activation of p-ERK could reverse the suppressive role of TNC knockdown in gastric cancer cells.ConclusionsTNC plays an important role in VM formation in gastric cancer. Combining inhibition of TNC and ERK may be a potential therapeutic approach to inhibit gastric cancer growth and metastasis and decrease anti-angiogenic therapeutic resistance.

scholarly journals Extracellular vesicles shed from gastric cancer mediate protumor macrophage differentiation

BMC Cancer ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Atene Ito ◽  
Shunsuke Kagawa ◽  
Shuichi Sakamoto ◽  
Kazuya Kuwada ◽  
Hiroki Kajioka ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cancer Cells ◽  
Cancer Patients ◽  
Ascitic Fluid ◽  
Extracellular Vesicles ◽  
Peritoneal Cavity ◽  
Peritoneal Dissemination ◽  
Tumor Associated Macrophages ◽  
Gastric Cancer Cells ◽  
Gastric Cancer Patients

Abstract Background Peritoneal dissemination often develops in gastric cancer. Tumor-associated macrophages (TAMs) are present in the peritoneal cavity of gastric cancer patients with peritoneal dissemination, facilitating tumor progression. However, the mechanism by which macrophages differentiate into tumor-associated macrophages in the peritoneal cavity is not well understood. In this study, the interplay between gastric cancer-derived extracellular vesicles (EVs) and macrophages was investigated. Methods The association between macrophages and EVs in peritoneal ascitic fluid of gastric cancer patients, or from gastric cancer cell lines was examined, and their roles in differentiation of macrophages and potentiation of the malignancy of gastric cancer were further explored. Results Immunofluorescent assays of the ascitic fluid showed that M2 macrophages were predominant along with the cancer cells in the peritoneal cavity. EVs purified from gastric cancer cells, as well as malignant ascitic fluid, differentiated peripheral blood mononuclear cell-derived macrophages into the M2-like phenotype, which was demonstrated by their morphology and expression of CD163/206. The macrophages differentiated by gastric cancer-derived EVs promoted the migration ability of gastric cancer cells, and the EVs carried STAT3 protein. Conclusion EVs derived from gastric cancer play a role by affecting macrophage phenotypes, suggesting that this may be a part of the underlying mechanism that forms the intraperitoneal cancer microenvironment.

scholarly journals DNAJA3/Tid1 Is Required for Mitochondrial DNA Maintenance and Regulates Migration and Invasion of Human Gastric Cancer Cells

Cancers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3463
Author(s):  
Sheng-Fan Wang ◽  
Kuo-Hung Huang ◽  
Wei-Chuan Tseng ◽  
Jeng-Fan Lo ◽  
Anna Fen-Yau Li ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cell Migration ◽  
Cancer Cells ◽  
Cancer Patients ◽  
Migration And Invasion ◽  
Gastric Cancer Cells ◽  
Cell Migration And Invasion ◽  
Gastric Cancers ◽  
Gastric Cancer Patients

Background: Gastric cancer is a common health issue. Deregulated cellular energetics is regarded as a cancer hallmark and mitochondrial dysfunction might contribute to cancer progression. Tid1, a mitochondrial co-chaperone, may play a role as a tumor suppressor in various cancers, but the role of Tid1 in gastric cancers remains under investigated. Methods: The clinical TCGA online database and immunohistochemical staining for Tid1 expression in tumor samples of gastric cancer patients were analyzed. Tid1 knockdown by siRNA was applied to investigate the role of Tid1 in gastric cancer cells. Results: Low Tid1 protein-expressing gastric cancer patients had a poorer prognosis and higher lymph node invasion than high Tid1-expressing patients. Knockdown of Tid1 did not increase cell proliferation, colony/tumor sphere formation, or chemotherapy resistance in gastric cancer cells. However, Tid1 knockdown increased cell migration and invasion. Moreover, Tid1 knockdown reduced the mtDNA copy number of gastric cancer cells. In addition, the Tid1-galectin-7-MMP-9 axis might be associated with Tid1 knockdown–induced cell migration and invasion of gastric cancer cells. Conclusions: Tid1 is required for mtDNA maintenance and regulates migration and invasion of gastric cancer cells. Tid1 deletion may be a poor prognostic factor in gastric cancers and could be further investigated for development of gastric cancer treatments.

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