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NFAT1 and NFAT3 cooperate with HDAC4 during regulation of alternative splicing of PMCA isoforms in PC12 cells.

Kosiorek M, Podszywalow-Bartnicka P, Zylinska L, Pikula S - PLoS ONE (2014)

Bottom Line: Luciferase assays showed increased activity of NFAT in PC12 cells, which was associated with altered expression of PMCA.RT-PCR experiments suggested that inhibition of the transcriptional activity of NFAT might result in the rearrangement of PMCA splicing variants in PC12 cells.NFAT inhibition led to dominant expression of 2x/c, 3x/a and 4x/a PMCA variants, while in untreated cells the 2w,z/b, 3z,x/b,c,e,f, and 4x/b variants were found as well.

View Article: PubMed Central - PubMed

Affiliation: Department of Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland; Department of Neurodegenerative Disorders, Laboratory of Neurogenetics, Mossakowski Medical Research Centre PAS, Warsaw, Poland.

ABSTRACT

Background: The bulk of human genes undergo alternative splicing (AS) upon response to physiological stimuli. AS is a great source of protein diversity and biological processes and is associated with the development of many diseases. Pheochromocytoma is a neuroendocrine tumor, characterized by an excessive Ca2+-dependent secretion of catecholamines. This underlines the importance of balanced control of calcium transport via regulation of gene expression pattern, including different calcium transport systems, such as plasma membrane Ca2+-ATPases (PMCAs), abundantly expressed in pheochromocytoma chromaffin cells (PC12 cells). PMCAs are encoded by four genes (Atp2b1, Atp2b2, Atp2b3, Atp2b4), whose transcript products undergo alternative splicing giving almost 30 variants.

Results: In this scientific report, we propose a novel mechanism of regulation of PMCA alternative splicing in PC12 cells through cooperation of the nuclear factor of activated T-cells (NFAT) and histone deacetylases (HDACs). Luciferase assays showed increased activity of NFAT in PC12 cells, which was associated with altered expression of PMCA. RT-PCR experiments suggested that inhibition of the transcriptional activity of NFAT might result in the rearrangement of PMCA splicing variants in PC12 cells. NFAT inhibition led to dominant expression of 2x/c, 3x/a and 4x/a PMCA variants, while in untreated cells the 2w,z/b, 3z,x/b,c,e,f, and 4x/b variants were found as well. Furthermore, chromatin immunoprecipitation experiments showed that NFAT1-HDAC4 or NFAT3-HDAC4 complexes might be involved in regulation of PMCA2x splicing variant generation.

Conclusions: We suggest that the influence of NFAT/HDAC on PMCA isoform composition might be important for altered dopamine secretion by PC12 cells.

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PMCA isoforms expression pattern versus transcriptional control by NFAT in PC12 cells.Expression of genes encoding PMCA isoforms: Atp21b1 (PMCA1), Atp21b2 (PMCA2), Atp21b3 (PMCA3), Atp21b4a (PMCA4a), Atp21b4b (PMCA4b) was determined by qPCR for PC12 cells non-treated (A), and treated with NFAT inhibitor (1 µM 11R-VIVIT) (B). Bars represent mean values ± SEM. Wilcoxon test was used for ΔCt from qPCR data (n = 3) for comparison between control cells (standardized to y = 0) and PMCA2- or PMCA3-deficient cells non-treated with 11R-VIVIT (n = 3). Two-way ANOVA test was used for comparison between non-treated and 11R-VIVIT treated cells. *P≤0.05, **P≤0.01.
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pone-0099118-g002: PMCA isoforms expression pattern versus transcriptional control by NFAT in PC12 cells.Expression of genes encoding PMCA isoforms: Atp21b1 (PMCA1), Atp21b2 (PMCA2), Atp21b3 (PMCA3), Atp21b4a (PMCA4a), Atp21b4b (PMCA4b) was determined by qPCR for PC12 cells non-treated (A), and treated with NFAT inhibitor (1 µM 11R-VIVIT) (B). Bars represent mean values ± SEM. Wilcoxon test was used for ΔCt from qPCR data (n = 3) for comparison between control cells (standardized to y = 0) and PMCA2- or PMCA3-deficient cells non-treated with 11R-VIVIT (n = 3). Two-way ANOVA test was used for comparison between non-treated and 11R-VIVIT treated cells. *P≤0.05, **P≤0.01.

Mentions: Following the above, the expression level of genes encoding PMCA isoforms: Atp21b1 (PMCA1), Atp21b2 (PMCA2), Atp21b3 (PMCA3), Atp21b4a (PMCA4a), Atp21b4b (PMCA4b) was determined by qPCR for PC12 cells non-treated (Fig. 2A), and compared with the cells treated with NFAT inhibitor (1 µM 11R-VIVIT) (Fig. 2B). On one hand, these experiments confirmed downregulation of PMCA2 or PMCA3 in respective cell lines. On the other hand, these experiments showed that inhibition of NFAT influenced significantly the expression pattern of PMCA4b as well as PMCA2 and PMCA3.


NFAT1 and NFAT3 cooperate with HDAC4 during regulation of alternative splicing of PMCA isoforms in PC12 cells.

Kosiorek M, Podszywalow-Bartnicka P, Zylinska L, Pikula S - PLoS ONE (2014)

PMCA isoforms expression pattern versus transcriptional control by NFAT in PC12 cells.Expression of genes encoding PMCA isoforms: Atp21b1 (PMCA1), Atp21b2 (PMCA2), Atp21b3 (PMCA3), Atp21b4a (PMCA4a), Atp21b4b (PMCA4b) was determined by qPCR for PC12 cells non-treated (A), and treated with NFAT inhibitor (1 µM 11R-VIVIT) (B). Bars represent mean values ± SEM. Wilcoxon test was used for ΔCt from qPCR data (n = 3) for comparison between control cells (standardized to y = 0) and PMCA2- or PMCA3-deficient cells non-treated with 11R-VIVIT (n = 3). Two-way ANOVA test was used for comparison between non-treated and 11R-VIVIT treated cells. *P≤0.05, **P≤0.01.
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4048221&req=5

pone-0099118-g002: PMCA isoforms expression pattern versus transcriptional control by NFAT in PC12 cells.Expression of genes encoding PMCA isoforms: Atp21b1 (PMCA1), Atp21b2 (PMCA2), Atp21b3 (PMCA3), Atp21b4a (PMCA4a), Atp21b4b (PMCA4b) was determined by qPCR for PC12 cells non-treated (A), and treated with NFAT inhibitor (1 µM 11R-VIVIT) (B). Bars represent mean values ± SEM. Wilcoxon test was used for ΔCt from qPCR data (n = 3) for comparison between control cells (standardized to y = 0) and PMCA2- or PMCA3-deficient cells non-treated with 11R-VIVIT (n = 3). Two-way ANOVA test was used for comparison between non-treated and 11R-VIVIT treated cells. *P≤0.05, **P≤0.01.
Mentions: Following the above, the expression level of genes encoding PMCA isoforms: Atp21b1 (PMCA1), Atp21b2 (PMCA2), Atp21b3 (PMCA3), Atp21b4a (PMCA4a), Atp21b4b (PMCA4b) was determined by qPCR for PC12 cells non-treated (Fig. 2A), and compared with the cells treated with NFAT inhibitor (1 µM 11R-VIVIT) (Fig. 2B). On one hand, these experiments confirmed downregulation of PMCA2 or PMCA3 in respective cell lines. On the other hand, these experiments showed that inhibition of NFAT influenced significantly the expression pattern of PMCA4b as well as PMCA2 and PMCA3.

Bottom Line: Luciferase assays showed increased activity of NFAT in PC12 cells, which was associated with altered expression of PMCA.RT-PCR experiments suggested that inhibition of the transcriptional activity of NFAT might result in the rearrangement of PMCA splicing variants in PC12 cells.NFAT inhibition led to dominant expression of 2x/c, 3x/a and 4x/a PMCA variants, while in untreated cells the 2w,z/b, 3z,x/b,c,e,f, and 4x/b variants were found as well.

View Article: PubMed Central - PubMed

Affiliation: Department of Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland; Department of Neurodegenerative Disorders, Laboratory of Neurogenetics, Mossakowski Medical Research Centre PAS, Warsaw, Poland.

ABSTRACT

Background: The bulk of human genes undergo alternative splicing (AS) upon response to physiological stimuli. AS is a great source of protein diversity and biological processes and is associated with the development of many diseases. Pheochromocytoma is a neuroendocrine tumor, characterized by an excessive Ca2+-dependent secretion of catecholamines. This underlines the importance of balanced control of calcium transport via regulation of gene expression pattern, including different calcium transport systems, such as plasma membrane Ca2+-ATPases (PMCAs), abundantly expressed in pheochromocytoma chromaffin cells (PC12 cells). PMCAs are encoded by four genes (Atp2b1, Atp2b2, Atp2b3, Atp2b4), whose transcript products undergo alternative splicing giving almost 30 variants.

Results: In this scientific report, we propose a novel mechanism of regulation of PMCA alternative splicing in PC12 cells through cooperation of the nuclear factor of activated T-cells (NFAT) and histone deacetylases (HDACs). Luciferase assays showed increased activity of NFAT in PC12 cells, which was associated with altered expression of PMCA. RT-PCR experiments suggested that inhibition of the transcriptional activity of NFAT might result in the rearrangement of PMCA splicing variants in PC12 cells. NFAT inhibition led to dominant expression of 2x/c, 3x/a and 4x/a PMCA variants, while in untreated cells the 2w,z/b, 3z,x/b,c,e,f, and 4x/b variants were found as well. Furthermore, chromatin immunoprecipitation experiments showed that NFAT1-HDAC4 or NFAT3-HDAC4 complexes might be involved in regulation of PMCA2x splicing variant generation.

Conclusions: We suggest that the influence of NFAT/HDAC on PMCA isoform composition might be important for altered dopamine secretion by PC12 cells.

Show MeSH
Related in: MedlinePlus