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Alteration of gene expression profile following PPP2R5C knockdown may be associated with proliferation suppression and increased apoptosis of K562 cells.

Liu S, Shen Q, Chen Y, Zeng C, Cao C, Yang L, Chen S, Wu X, Li B, Li Y - J Hematol Oncol (2015)

Bottom Line: We reported that knockdown of PPP2R5C by siRNA led to proliferation inhibition and apoptosis induction in K562 cells.In this study, we further characterized the gene expression profiles after PPP2R5C suppression by microarray analysis.Genes which participate in the MAPK, PI3K/AKT, and JAK/STAT pathways, were mainly altered in the K562 cells.

View Article: PubMed Central - PubMed

Affiliation: Institute of Hematology, Jinan University, Guangzhou, 510632, China. lsc_csl@163.com.

ABSTRACT
We reported that knockdown of PPP2R5C by siRNA led to proliferation inhibition and apoptosis induction in K562 cells. In this study, we further characterized the gene expression profiles after PPP2R5C suppression by microarray analysis. Genes which participate in the MAPK, PI3K/AKT, and JAK/STAT pathways, were mainly altered in the K562 cells. We propose that the mechanism for proliferation inhibition and increased apoptosis of K562 cells following PPP2R5C suppression may be related to the alteration of expression profiles of BRAF, AKT2, AKT3, NFKB2 and STAT3 genes.

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Microarray analysis for gene expression profiles of K562 cells after transfection with PPP2R5C-siRNA991. (A) Scatter plots comparing the gene expression profiles of siRNA991 and scrambled control (SC) transfected cells. The yellow dots represent genes undetected in both samples, blue dots represent genes present in both samples, red dots represent upregulated genes, and green dots represent downregulated genes. (B) The Affymetrix data were clustered, and the red and green colors represent the expression levels increased or decreased, respectively, with respect to the average expression across all samples. (C) PI3K/AKT signaling pathway genes differentially expressed in K562 cells after PPP2R5C suppression. (D) JAK/STAT signaling pathways genes differentially expressed in K562 cells after PPP2R5C suppression. (E) Schematic model of the BCR-ABL-mediated BRAF-MEK-FOS-JUN signaling pathway due to PPP2R5C suppression in K562 cells (modified from reference [8]).
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Fig1: Microarray analysis for gene expression profiles of K562 cells after transfection with PPP2R5C-siRNA991. (A) Scatter plots comparing the gene expression profiles of siRNA991 and scrambled control (SC) transfected cells. The yellow dots represent genes undetected in both samples, blue dots represent genes present in both samples, red dots represent upregulated genes, and green dots represent downregulated genes. (B) The Affymetrix data were clustered, and the red and green colors represent the expression levels increased or decreased, respectively, with respect to the average expression across all samples. (C) PI3K/AKT signaling pathway genes differentially expressed in K562 cells after PPP2R5C suppression. (D) JAK/STAT signaling pathways genes differentially expressed in K562 cells after PPP2R5C suppression. (E) Schematic model of the BCR-ABL-mediated BRAF-MEK-FOS-JUN signaling pathway due to PPP2R5C suppression in K562 cells (modified from reference [8]).

Mentions: To further investigate the gene expression profile, PPP2R5C-siRNA991-treated K562 cells were collected at 48 h post transfection when PPP2R5C mRNA was most suppressed [2]. Gene expression profiles were determined and analyzed by Affymetrix microarrays as reported (See Additional file 1 for methods and materials) [3,4]. Overall, 2,586 genes were upregulated and 2,601 genes were downregulated at least two-fold, when PPP2R5C-siRNA991 and SC-treated expression data were compared. We also found both the Bcr and Abl genes were downregulated (fold change: −1.23 and −1.53, respectively), suggesting that PPP2R5C is closely related to the BCR-ABL-mediated pathway. Besides that, there were changes in genes involved in different signaling pathways closely related to cell proliferation and apoptosis (Table 1, Figure 1A and B).Table 1


Alteration of gene expression profile following PPP2R5C knockdown may be associated with proliferation suppression and increased apoptosis of K562 cells.

Liu S, Shen Q, Chen Y, Zeng C, Cao C, Yang L, Chen S, Wu X, Li B, Li Y - J Hematol Oncol (2015)

Microarray analysis for gene expression profiles of K562 cells after transfection with PPP2R5C-siRNA991. (A) Scatter plots comparing the gene expression profiles of siRNA991 and scrambled control (SC) transfected cells. The yellow dots represent genes undetected in both samples, blue dots represent genes present in both samples, red dots represent upregulated genes, and green dots represent downregulated genes. (B) The Affymetrix data were clustered, and the red and green colors represent the expression levels increased or decreased, respectively, with respect to the average expression across all samples. (C) PI3K/AKT signaling pathway genes differentially expressed in K562 cells after PPP2R5C suppression. (D) JAK/STAT signaling pathways genes differentially expressed in K562 cells after PPP2R5C suppression. (E) Schematic model of the BCR-ABL-mediated BRAF-MEK-FOS-JUN signaling pathway due to PPP2R5C suppression in K562 cells (modified from reference [8]).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4414434&req=5

Fig1: Microarray analysis for gene expression profiles of K562 cells after transfection with PPP2R5C-siRNA991. (A) Scatter plots comparing the gene expression profiles of siRNA991 and scrambled control (SC) transfected cells. The yellow dots represent genes undetected in both samples, blue dots represent genes present in both samples, red dots represent upregulated genes, and green dots represent downregulated genes. (B) The Affymetrix data were clustered, and the red and green colors represent the expression levels increased or decreased, respectively, with respect to the average expression across all samples. (C) PI3K/AKT signaling pathway genes differentially expressed in K562 cells after PPP2R5C suppression. (D) JAK/STAT signaling pathways genes differentially expressed in K562 cells after PPP2R5C suppression. (E) Schematic model of the BCR-ABL-mediated BRAF-MEK-FOS-JUN signaling pathway due to PPP2R5C suppression in K562 cells (modified from reference [8]).
Mentions: To further investigate the gene expression profile, PPP2R5C-siRNA991-treated K562 cells were collected at 48 h post transfection when PPP2R5C mRNA was most suppressed [2]. Gene expression profiles were determined and analyzed by Affymetrix microarrays as reported (See Additional file 1 for methods and materials) [3,4]. Overall, 2,586 genes were upregulated and 2,601 genes were downregulated at least two-fold, when PPP2R5C-siRNA991 and SC-treated expression data were compared. We also found both the Bcr and Abl genes were downregulated (fold change: −1.23 and −1.53, respectively), suggesting that PPP2R5C is closely related to the BCR-ABL-mediated pathway. Besides that, there were changes in genes involved in different signaling pathways closely related to cell proliferation and apoptosis (Table 1, Figure 1A and B).Table 1

Bottom Line: We reported that knockdown of PPP2R5C by siRNA led to proliferation inhibition and apoptosis induction in K562 cells.In this study, we further characterized the gene expression profiles after PPP2R5C suppression by microarray analysis.Genes which participate in the MAPK, PI3K/AKT, and JAK/STAT pathways, were mainly altered in the K562 cells.

View Article: PubMed Central - PubMed

Affiliation: Institute of Hematology, Jinan University, Guangzhou, 510632, China. lsc_csl@163.com.

ABSTRACT
We reported that knockdown of PPP2R5C by siRNA led to proliferation inhibition and apoptosis induction in K562 cells. In this study, we further characterized the gene expression profiles after PPP2R5C suppression by microarray analysis. Genes which participate in the MAPK, PI3K/AKT, and JAK/STAT pathways, were mainly altered in the K562 cells. We propose that the mechanism for proliferation inhibition and increased apoptosis of K562 cells following PPP2R5C suppression may be related to the alteration of expression profiles of BRAF, AKT2, AKT3, NFKB2 and STAT3 genes.

Show MeSH
Related in: MedlinePlus