scholarly journals MicroRNA-99a promotes cell proliferation, migration and invasion in gastric cancer by modulating c-Src

2019 ◽  
Author(s):  
Yue Pan ◽  
Weixing Chen ◽  
Xin Yuan ◽  
Hongpeng Lu ◽  
Lei Xu ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cell Cycle ◽  
Cell Proliferation ◽  
Cancer Cells ◽  
Migration And Invasion ◽  
Epithelial Cell Line ◽  
Cancer Tissue ◽  
Gastric Cancer Cells ◽  
Normal Tissues ◽  
Qrt Pcr

Abstract Background: Recent studies have shown that microRNA-99a(miR-99a)plays a key role in the development of virious malignancies; however, its relationship with gastric cancer remains unclear. In this study, we investigated the functions and potential mechanisms of miR-99a in gastric cancer. Methods: Real-time qRT-PCR was used to assess the expression levels of miR-99a in gastric cancer tissue samples and cell lines compared to their matched adjacent normal tissues and a normal gastric mucosa epithelial cell line, respectively. SGC-7901 cells were transfected with miR-99a mimics and negative controls to determine the effects of miR-99a overexpression on cell proliferation, cell cycle transition, migration and invasion of gastric cancer cells in vitro . The role of miR-99a in endogenous c-Src expression in gastric cancer cells was also investigated by qRT-PCR and Western blotting. Results: Our results showed a significant increase in miR-99a expression in both gastric cancer tissues and cells compared to normal tissues and cells. Overexpression of miR-99a significantly promoted the cell proliferation, migration and invasion of gastric cancer cells compared to normal cells, with a concurrent increase in the S+G2 phases of the cell cycle. Further investigations found that miR-99a overexpression led to significant upregulation of endogenous c-Src. Conclusion: Taken together, our findings suggest that miR-99a may act as a tumour promoter in the pathogenesis of gastric cancer by indirectly modulating c-Src expression.

scholarly journals Andrographolide Inhibits Proliferation and Metastasis of SGC7901 Gastric Cancer Cells

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Lei Dai ◽  
Gang Wang ◽  
Wensheng Pan
Keyword(s):  
Gastric Cancer ◽  
Cell Cycle ◽  
Cell Proliferation ◽  
Cancer Cells ◽  
Cyclin B1 ◽  
Migration And Invasion ◽  
Survival Ratio ◽  
Gastric Cancer Cells ◽  
Expression Levels ◽  
Proliferation And Metastasis

To explore the mechanisms by which andrographolide inhibits gastric cancer cell proliferation and metastasis, we employed the gastric cell line SGC7901 to investigate the anticancer effects of andrographolide. The cell survival ratio, cell migration and invasion, cell cycle, apoptosis, and matrix metalloproteinase activity were assessed. Moreover, western blotting and real-time PCR were used to examine the protein expression levels and the mRNA expression levels, respectively. The survival ratio of cells decreased with an increasing concentration of andrographolide in a dose-dependent manner. Consistent results were also obtained using an apoptosis assay, as detected by flow cytometry. The cell cycle was blocked at the G2/M2 phase by andrographolide treatment, and the proportion of cells arrested at G1/M was enhanced as the dose increased. Similarly, wound healing and Transwell assays showed reduced migration and invasion of the gastric cancer cells at various concentrations of andrographolide. Andrographolide can inhibit cell proliferation, invasion, and migration, block the cell cycle, and promote apoptosis in SGC7901 cells. The mechanisms may include upregulated expression of Timp-1/2, cyclin B1, p-Cdc2, Bax, and Bik and downregulated expression of MMP-2/9 and antiapoptosis protein Bcl-2.

scholarly journals Distinctive Prognostic Value and Cellular Functions of Osteopontin Splice Variants in Human Gastric Cancer

Cells ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1820
Author(s):  
Chengcheng Hao ◽  
Yuxin Cui ◽  
Jane Lane ◽  
Shuqin Jia ◽  
Jiafu Ji ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cancer Cells ◽  
Cell Lines ◽  
Prognostic Value ◽  
Splice Variants ◽  
Tnm Staging ◽  
Migration And Invasion ◽  
Ros Production ◽  
Gastric Cancer Cells ◽  
Normal Tissues

Background: Osteopontin (OPN) splice variants are identified as predictors of tumour progression and therapeutic resistance in certain types of solid tumours. However, their roles in gastric cancer (GC) remain poorly characterized. The current study sought to assess the prognostic value of the three OPN splice variants (namely OPN-a, OPN-b, and OPN-c) in gastric cancer and their potential functions within gastric cancer cells. Methods: RNA extraction and reverse transcription were performed using our clinical cohort of gastric carcinomas and matched normal tissues (n = 324 matched pairs). Transcript levels were determined using real-time quantitative PCR. Three OPN splice variants overexpressed cell lines were created from the gastric cancer cell line HGC-27. Subsequently, biological functions, including cell growth, adhesion, migration, and invasion, were studied. The potential effects of OPN isoforms on cisplatin and 5-Fu were evaluated by detecting cellular reactive oxygen species (ROS) levels in the HGC-27-derived cell lines. Results: Compared with normal tissues, the expression levels of three splice variants were all elevated in gastric cancer tissues in an order of OPN-a > OPN-b > OPN-c. The OPN-a level significantly increased with increasing TNM staging and worse clinical outcome. There appeared to be a downregulation for OPN-c in increasing lymph node status (p < 0.05), increasing TNM staging, and poor differentiation. High levels of OPN-a and OPN-b were correlated with short overall survival and disease-free survival of gastric cancer patients. However, the low expression of OPN-c was significantly associated with a poor prognosis. Functional analyses further showed that ectopic expression of OPN-c suppressed in vitro proliferation, adhesiveness, migration, and invasion properties of HGC-27 cells, while the opposite role was seen for OPN-a. Cellular ROS detection indicated that OPN-a and OPN-c significantly promoted ROS production after treatment with 5-Fu comparing to OPN-vector, while only OPN-a markedly induced ROS production after treatment with cisplatin. Conclusion: Our results suggest that OPN splice variants have distinguished potential to predict the prognosis of gastric cancer. Three OPN variants exert distinctive functions in gastric cancer cells. Focusing on specific OPN isoforms could be a novel direction for developing diagnostic and therapeutic approaches in gastric cancer.

scholarly journals The tRNA-derived fragment 5026a inhibits the proliferation of gastric cancer cells by regulating the PTEN/PI3K/AKT signaling pathway

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Linwen Zhu ◽  
Zhe Li ◽  
Xiuchong Yu ◽  
Yao Ruan ◽  
Yijing Shen ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cell Cycle ◽  
Cancer Cells ◽  
Signaling Pathway ◽  
Cell Lines ◽  
Akt Signaling ◽  
Akt Signaling Pathway ◽  
Gastric Cancer Cells ◽  
Qrt Pcr

Abstract Background Recently, tRNA-derived fragments (tRFs) have been shown to serve important biological functions. However, the role of tRFs in gastric cancer has not been fully elucidated. This study aimed to identify the tumor suppressor role of tRF-5026a (tRF-18-79MP9P04) in gastric cancer. Methods Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) was first used to detect tRF-5026a expression levels in gastric cancer tissues and patient plasma. Next, the relationship between tRF-5026a levels and clinicopathological features in gastric cancer patients was assessed. Cell lines with varying tRF-5026a levels were assessed by measuring tRF-5026a using qRT-PCR. After transfecting cell lines with a tRF-5026a mimic or inhibitor, cell proliferation, colony formation, migration, apoptosis, and cell cycle were evaluated. The expression levels of related proteins in the PTEN/PI3K/AKT pathway were also analyzed by Western blotting. Finally, the effect of tRF-5026a on tumor growth was tested using subcutaneous tumor models in nude mice. Results tRF-5026a was downregulated in gastric cancer patient tissues and plasma samples. tRF-5026a levels were closely related to tumor size, had a certain diagnostic value, and could be used to predict overall survival. tRF-5026a was also downregulated in gastric cancer cell lines. tRF-5026a inhibited the proliferation, migration, and cell cycle progression of gastric cancer cells by regulating the PTEN/PI3K/AKT signaling pathway. Animal experiments showed that upregulation of tRF-5026a effectively inhibited tumor growth. Conclusions tRF-5026a (tRF-18-79MP9P04) is a promising biomarker for gastric cancer diagnostics and has tumor suppressor effects mediated through the PTEN/PI3K/AKT signaling pathway.

scholarly journals MiR-496 Inhibits the Proliferation Through Targeting LYN and AKT/mTOR Signaling Pathway in Gastric Cancer

2020 ◽  
Author(s):  
Rui Su ◽  
Enhong Zhao ◽  
Jun Zhang
Keyword(s):  
Gastric Cancer ◽  
Cell Proliferation ◽  
Cancer Cells ◽  
Signaling Pathway ◽  
Mtor Signaling ◽  
Migration And Invasion ◽  
Human Gastric Cancer ◽  
Mtor Signaling Pathway ◽  
Gastric Cancer Cells ◽  
Ags Cells

Abstract MiRNA operates as a tumor suppressor or carcinogen to regulate cell proliferation, metastasis, invasion, differentiation, apoptosis and metabolic process. In the present research, we investigated the effect and mechanism of miR496 in human gastric cancer cells. Cell proliferation was measured by CCK8 and clonogenic assay. Transwell test was performed to detect cell migration and invasion. Flow cytometry analysis was used to evaluate cell apoptosis. Bioinformatics software targetscan was used for the screening of miR-496’s target gene. MiR-496 was down regulated in three gastric cancer cell lines, SGC-790, AGS and MKN45 compared with normal gastric epithelial cell line GES-1. MiR-496 mimics inhibited the proliferation of AGS cells after the transfection for 48 h and 72 h. The migration and invasion of AGS cells were also inhibited by the transfection of miR-496 mimics. In addition, miR-496 mimics induced the apoptosis through up regulating the levels of Bax and Active Caspase3 and down regulating the levels of Bcl-2 and Total Caspase3. Bioinformatics analysis showed that there was a binding site between miR-496 and LYN kinase (LYN). MiR-496 mimics could inhibit the expression of LYN in AGS cells. The overexpression of LYN blocked the inhibition of tumor cell growth, as well as the inhibition of AKT/mTOR signaling pathway induced by miR-496 in gastric cancer cells. In conclusion, miR-496 inhibited the proliferation through the AKT/mTOR signaling pathway via targeting LYN in gastric cancer cells. Our research provides a new potential target for clinical diagnosis and targeted treatment of gastric cancer.

scholarly journals Chrysophanol Inhibits the Progression of Gastric Cancer by Activating NLRP3

2021 ◽  
Author(s):  
Hou Binfen ◽  
Li Zhao ◽  
Min Deng
Keyword(s):  
Gastric Cancer ◽  
Cell Proliferation ◽  
Cancer Cells ◽  
Migration And Invasion ◽  
Gastric Cancer Cells ◽  
Antitumor Effects ◽  
Ags Cells ◽  
Anti Cancer ◽  
Colony Forming Assay

Abstract AimGastric cancer is one of the most common malignant tumors.Chrysophanol has been reported to have antitumor effects on a variety of cancers, but the role of chrysophanol in gastric cancer remains unclear. The aim of this study was to investigate the effects of chrysophanol on proliferation, pyroptosis, migration and invasion of gastric cancer cells.MethodsMKN 28 and AGS cells were treatde with different concentrations of chrysophanol, then cell proliferation, migration,invasion and pyroptosis were decteed by CCK-8, Colony-forming assay, Wound Healing assay, Transwell and flow cytometry, respectively.Subsequently, NLRP3 siRNA was transfected into MKN 28 cells, cell proliferation pyroptosis, migration and invasion were reassessed in these transfected cells. The expression of caspase-1 and IL-1β in the downstream of NLRP3 was detected by qRT PCR and Western blot.ResultsChrysophanol significantly inhibited the proliferation of GC cells, promoted pyroptosis, inhibited cell migration and invasion, and up-regulated the expression level of NLRP3 inflammasome in GC cells. Silencing NLRP3 inhibited the effects of chrysophanol on proliferation, pyroptosis, migration and invasion of MKN 28 cells. Chrysophanol plays an anti-cancer role through high expression of NLRP3.CoclusionsChrysophanol can inhibit the proliferation, migration and invasion of gastric cancer cells by regulating NLRP3, promote the death of gastric cancer cells, and play an anti-tumor role,which is a clinical strategy with great potential for the treatment of gastric cancer.

Histone Deacetylase Inhibitor Trichostatin A Suppresses Cell Proliferation and Induces Apoptosis by Regulating the PI3K/AKT Signalling Pathway in Gastric Cancer Cells

2020 ◽  
Vol 20 (17) ◽  
pp. 2114-2124
Author(s):  
Xinli An ◽  
Zekun Wei ◽  
Botian Ran ◽  
Hao Tian ◽  
Hongyu Gu ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cell Cycle ◽  
Flow Cytometry ◽  
Cell Proliferation ◽  
Cancer Cells ◽  
Histone Deacetylase ◽  
Trichostatin A ◽  
Gastric Cancer Cells ◽  
Growth Modulation ◽  
Regulatory Pathways

Background: Gastric cancer, a common malignant tumour worldwide, has a relatively poor prognosis and is a serious threat to human health. Histone Deacetylase Inhibitors (HDACi) are anticancer agents that are known to affect the cell growth of different cancer types. Trichostatin A (TSA) selectively inhibits the class I and II mammalian Histone Deacetylase (HDAC) family enzymes and regulates many cell processes. Still, the underlying mechanisms of HDACs are not fully understood in gastric cancer. Objective: This study aims to investigate the antitumor effect and the mechanism of growth modulation of gastric cancer cells by TSA. Methods: The cell proliferation of gastric cancer cells was measured by MTT and BrdU immunofluorescence assays. Soft agar assay was used to detect the colony formation ability of gastric cancer cells. Flow cytometry was used to examine cell cycle and apoptosis. Western blot was employed to detect protein expression of target factors. Results: TSA inhibits the proliferation of MKN-45 and SGC-7901 cells and leads to significant repression of colony number and size. Flow cytometry assays show TSA induces cell cycle arrest at G1 phase and apoptosis, and TSA effects the expression of related factors in the mitochondrial apoptotic signalling and cell cycle-related regulatory pathways. Furthermore, TSA increased histone H3K27 acetylation and downregulated the expression of PI3K and p-AKT. Conclusion: Downregulating PI3K/AKT pathway activation is involved in TSA-mediated proliferation inhibition of gastric cancer.

Overexpression of p42.3 promotes cell proliferation, migration, and invasion in human gastric cancer cells

Tumor Biology ◽  
2016 ◽  
Vol 37 (9) ◽  
pp. 12805-12812 ◽  
Author(s):  
Wen-Jia Cao ◽  
Wen-Qi Du ◽  
Lin-Lin Mao ◽  
Jun-Nian Zheng ◽  
Dong-Sheng Pei
Keyword(s):  
Gastric Cancer ◽  
Cell Proliferation ◽  
Cancer Cells ◽  
Migration And Invasion ◽  
Human Gastric Cancer ◽  
Gastric Cancer Cells

scholarly journals Sophoridine exerts tumor-suppressive activities via promoting ESRRG-mediated β-catenin degradation in gastric cancer

2020 ◽  
Author(s):  
Zhiyang Peng ◽  
Qing Guan ◽  
Jianfei Luo ◽  
Wenhong Deng ◽  
Jiasheng Liu ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cancer Cells ◽  
Migration And Invasion ◽  
Epithelial Cell Line ◽  
Dna Breaks ◽  
M Cell ◽  
Gastric Cancer Cells ◽  
Cell Viability Assay ◽  
Independent Manner ◽  
Inhibition Of Proliferation

Abstract Background: This study ought to further explore the anti-tumor effects of Sophoridine on gastric cancer cells. Methods: Cell viability assay (CCK-8 assay) was used to measure the IC50 values of Sophoridine on gastirc cancer AGS and SGC7901 cell lines and normal gastric epithelial cell line GES-1. EdU and colony formation assay were performed to confirm the cytotoxic effect of Sophoridine on AGS and SGC7901 cells. The apoptotic effects of Sophoridine on AGS and SGC7901 cells were measured by Flow cytometry. Transwell assay was used to evaluate the effects of Sophoridine on migration and invasion of AGS and SGC7901 cells. The protein expression of Sophoridine on AGS and SGC7901 cells were detected via Western blot. Results: We demonstrated that Sophoridine exerts potent tumor-suppressive activities, including inhibition of proliferation, colony formulation, migration and invasion, as well as induction of apoptosis of gastric cancer cells. In addition, we further showed that Sophoridine induces G2/M cell cycle arrest via inhibiting double-stranded DNA breaks repair and enhances the efficacy of cisplatin in gastric cancer cells. Molecular studies further revealed that Sophoridine depends on Estrogen-related receptor gamma (ESRRG) to perform tumor-suppressive activities and which leads to the degradation of β-catenin in an ubiquitin-proteasome pathway independent manner. Conclusions: Our study provided the promising preclinical anti-tumor evidence for the potential application of Sophoridine against gastric cancer.

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