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Relationship between Mecp2 and NF?b signaling during neural differentiation of P19 cells.

ABSTRACT: The pluripotent P19 embryo carcinoma cell line was studied to determine a signaling pathway regulating MeCP2 expression. P19 cells were induced to differentiate into neurons by RA and express ?-III tubulin at one day after induction and synaptophysin by 7 days. MeCP2 was first observed after ?-III tubulin expression was detected and continued to rise over the course of differentiation. Both Mecp2 e1 and e2 mRNA forms progressively increased in differentiating cells. MeCP2 expression was increased by tumor necrosis factor (TNF) in early differentiating cells, which was blocked by NF?B inhibitors. TNF did not increase MeCP2 expression in naïve cells. Moreover, TNF did not increase NF?B reporter gene activity in naïve cells even though increases were observed in early differentiating cells. The protein kinase C activator phorbol 12-myristate 13-acetate (PMA) increased MeCP2 expression in naïve P19 cells, which was also blocked by NF?B inhibitors. Interestingly, PMA increased NF?B reporter gene activity in naïve cells. Finally, PMA, but not TNF, induced I?B? degradation in naïve P19 cells. Taken together, our data indicates that MeCP2 expression is regulated in part by signaling pathways involving NF?B.

SUBMITTER: O'Driscoll C

PROVIDER: S-EPMC7243855 | biostudies-literature | 2013 Jan

REPOSITORIES: biostudies-literature

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Relationship between Mecp2 and NFκb signaling during neural differentiation of P19 cells.

O'Driscoll Cliona C Kaufmann Walter E WE Bressler Joseph J

Brain research 20121102

The pluripotent P19 embryo carcinoma cell line was studied to determine a signaling pathway regulating MeCP2 expression. P19 cells were induced to differentiate into neurons by RA and express β-III tubulin at one day after induction and synaptophysin by 7 days. MeCP2 was first observed after β-III tubulin expression was detected and continued to rise over the course of differentiation. Both Mecp2 e1 and e2 mRNA forms progressively increased in differentiating cells. MeCP2 expression was increase ...[more]

PMID: 23123205

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Project description:Corexit-EC9500A and Corexit-EC9527A are two chemical dispersants that have been used to remediate the impact of the 2010 Deepwater Horizon oil spill. Both dispersants are composed primarily of organic solvents and surfactants and act by emulsifying the crude oil to facilitate biodegradation. The potential adverse effect of the Corexit chemicals on mammalian embryonic development remains largely unknown. Retinol (vitamin A) signaling, mediated by all-trans retinoic acid (RA), is essential for neural tube formation and the development of many organs in the embryo. The physiological levels of RA in cells and tissues are maintained by the retinol signaling pathway (RSP), which controls the biosynthesis of RA from dietary retinol and the catabolism of RA to polar metabolites for removal. RA is a potent activating ligand for the RAR/RXR nuclear receptors. Through RA and the receptors, the RSP modulates the expression of many developmental genes; interference with the RSP is potentially teratogenic. In this study the mouse P19 embryonal pluripotent cell, which contains a functional RSP, was used to evaluate the effects of the Corexit dispersants on retinol signaling and associated neuronal differentiation. The results showed that Corexit-EC9500A was more cytotoxic than Corexit-EC9527A to P19 cells. At non-cytotoxic doses, Corexit-EC9527A inhibited retinol-induced expression of the Hoxa1 gene, which encodes a transcription factor for the regulation of body patterning in the embryo. Such inhibition was seen in the retinol- and retinal- induced, but not RA-induced, Hoxa1 up-regulation, indicating that the Corexit chemicals primarily inhibit RA biosynthesis from retinal. In addition, Corexit-EC9527A suppressed retinol-induced P19 cell differentiation into neuronal cells, indicating potential neurotoxic effect of the chemicals under the tested conditions. The surfactant ingredient, dioctyl sodium sulfosuccinate (DOSS), may be a major contributor to the observed effect of Corexit-EC9527A in the cell.

Project description:Healthy aging is associated with decreased neural selectivity (dedifferentiation) in category-selective cortical regions. This finding has prompted the suggestion that dedifferentiation contributes to age-related cognitive decline. Consistent with this possibility, dedifferentiation has been reported to negatively correlate with fluid intelligence in older adults. Here, we examined whether dedifferentiation is associated with performance in another cognitive domain-episodic memory-that is also highly vulnerable to aging. Given the proposed role of dedifferentiation in age-related cognitive decline, we predicted there would be a stronger link between dedifferentiation and episodic memory performance in older than in younger adults. Young (18-30 years) and older (64-75 years) male and female humans underwent fMRI scanning while viewing images of objects and scenes before a subsequent recognition memory test. We computed a differentiation index in two regions of interest (ROIs): parahippocampal place area (PPA) and lateral occipital complex (LOC). This index quantified the selectivity of the BOLD response to preferred versus nonpreferred category of an ROI (scenes for PPA, objects for LOC). The differentiation index in the PPA, but not the LOC, was lower in older than in younger adults. Additionally, the PPA differentiation index predicted recognition memory performance for the studied items. This relationship was independent of and not moderated by age. The PPA differentiation index also predicted performance on a latent "fluency" factor derived from a neuropsychological test battery; this relationship was also age invariant. These findings suggest that two independent factors, one associated with age, and the other with cognitive performance, influence neural differentiation.SIGNIFICANCE STATEMENT Aging is associated with neural dedifferentiation-reduced neural selectivity in "category-selective" cortical brain regions-which has been proposed to contribute to cognitive aging. Here, we examined whether neural differentiation is predictive of episodic memory performance, and whether the relationship is moderated by age. A neural differentiation index was estimated for scene-selective (PPA) and object-selective (LOC) cortical regions while participants studied images for a subsequent memory test. Age-related reductions were observed for the PPA, but not for the LOC, differentiation index. Importantly, the PPA differentiation index demonstrated age-invariant correlations with subsequent memory performance and a fluency factor derived from a neuropsychological battery. Together, these findings suggest that neural differentiation is associated with two independent factors: age and cognitive performance.

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Relationship between Mecp2 and NF?b signaling during neural differentiation of P19 cells.

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Relationship between Mecp2 and NFκb signaling during neural differentiation of P19 cells.

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