The General Hospital of Chengdu Military Region

Chengdu, China

The General Hospital of Chengdu Military Region

Chengdu, China
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Tan Y.,The General Hospital of Chengdu Military Region | Peng J.,The General Hospital of Chengdu Military Region | Wei D.,The General Hospital of Chengdu Military Region | Chen P.,The General Hospital of Chengdu Military Region | Zhao Y.,The General Hospital of Chengdu Military Region
Experimental and Therapeutic Medicine | Year: 2012

The aim of this study was to determine the effect of Jagged1 on the proliferation and migration of colon cancer cells. HT-29 colorectal carcinoma cells were transfected with adenovirus carrying either the Jagged1 gene (Ad-Jagged1) or Jagged1 small interfering RNA (siRNA) (Ad-si/hJagged1). The protein was detected using western blot analysis. The proliferation of cells was observed by assessing the incorporation of [ 3H]-thymidine. The migration of cells was detected using a modified Boyden chamber assay. The level of Jagged1 protein increased by 2.8-fold with Ad-Jagged1 transfection and decreased by 70% with Ad-si/hJagged1 transfection. Proliferation, migration and p-Akt protein expression were enhanced in the Ad-Jagged1-transfected group compared to that in the non-transfected control group. In addition, the proliferation, migration and phosphorylated Akt protein expression were reduced in the Ad-si/hJagged1-transfected group compared to that in the non-transfected control group. The Jagged1 protein may promote proliferation and migration of colon cancer cells, which may be related to its effect on Akt phosphorylation.


PubMed | The General Hospital of Chengdu Military Region
Type: Journal Article | Journal: Experimental and therapeutic medicine | Year: 2012

The aim of this study was to determine the effect of Jagged1 on the proliferation and migration of colon cancer cells. HT-29 colorectal carcinoma cells were transfected with adenovirus carrying either the Jagged1 gene (Ad-Jagged1) or Jagged1 small interfering RNA (siRNA) (Ad-si/hJagged1). The protein was detected using western blot analysis. The proliferation of cells was observed by assessing the incorporation of [(3)H]-thymidine. The migration of cells was detected using a modified Boyden chamber assay. The level of Jagged1 protein increased by 2.8-fold with Ad-Jagged1 transfection and decreased by 70% with Ad-si/hJagged1 transfection. Proliferation, migration and p-Akt protein expression were enhanced in the Ad-Jagged1-transfected group compared to that in the non-transfected control group. In addition, the proliferation, migration and phosphorylated Akt protein expression were reduced in the Ad-si/hJagged1-transfected group compared to that in the non-transfected control group. The Jagged1 protein may promote proliferation and migration of colon cancer cells, which may be related to its effect on Akt phosphorylation.


PubMed | The General Hospital of Chengdu Military Region
Type: Journal Article | Journal: Cancer gene therapy | Year: 2015

MicroRNAs (miRNAs) have been identified as important posttranscriptional regulators involved in various biological and pathological processes of cells, but their association with tumor chemoresistance has not been fully understood. We detected miR-15b expression in two lung adenocarcinoma cell lines, A549 and A549/CDDP, and then investigated the effects of miR-15b on the metastasis and the chemosensitivity of cancer cells, using both gain- and loss-of-function studies. The correlation between miR-15b level and chemoresistance was further investigated in clinical lung adenocarcinoma specimens. miR-15b was significantly upregulated in cisplatin-resistant lung adenocarcinoma A549/CDDP cells compared with parental A549 cells. miR-15b regulates epithelial-mesenchymal transition (EMT) and cisplatin resistance in vitro and modulates response of lung adenocarcinoma cells to cisplatin in vivo. Further studies identified phosphatidylethanolamine-binding protein 4 (PEBP4) as a direct and functional target of miR-15b. Small-interfering RNA-mediated PEBP4 knockdown revealed similar effects as that of ectopic miR-15b expression, whereas overexpression of PEBP4 attenuated the function of miR-15b in lung adenocarcinoma cells. Increased miR-15b expression was also detected in tumor tissues sampled from lung adenocarcinoma patients treated with cisplatin-based chemotherapy and was proved to be correlated with low expression of PEBP4, decreased sensitivity to cisplatin and poor prognosis. Our results suggest that upregulation of miR-15b could suppress PEBP4 expression and in turn contribute to chemoresistance of lung adenocarcinoma cells to cisplatin.

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