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Transcriptomics modification consecutive to AS1842856 treatment in primary T lymphocytes

ABSTRACT: We have observed that the FOXO1 inhibitor AS1842856 induces a significant increase of both the bioenergetics and transcriptional activity of human T cells, together with a significant increase in their size, without any cell division. These modifications are accompanied by a decrease of p27 expression, contrasting with an increase of CDK2 cellular levels and by the phosphorylation of Rb and SAMHD1 proteins. As these changes are known to be characteristic of cells undergoing a G0 to G1 progression. To get an overall view of these changes in T-cell metabolism, we performed gene expression microarray analysis of PBT cultured during 7 days in the presence or not of AS1842856. We conclude that inhibition of FOXO1 by AS1842856 is sufficient to induce a profound reprogramming of human T lymphocytes, regulating their exit from quiescence.

ORGANISM(S): Homo sapiens

PROVIDER: GSE125328 | GEO | 2019/03/08

REPOSITORIES: GEO

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Project description:Machado-Joseph disease (MJD) is a fatal neurodegenerative disease caused by expansion of the trinucleotide repeat region within the ATXN3/MJD gene. Mutation of ATXN3 causes formation of neurotoxic ataxin-3 protein aggregates, neurodegeneration and motor deficits. Here we investigated the therapeutic potential and mechanistic activity of sodium butyrate (SB), the sodium salt of butyric acid, a metabolite naturally produced by gut microbiota, on cultured SH-SY5Y cells and transgenic zebrafish expressing human ataxin-3 containing 84 glutamine (Q) residues to model MJD. MJD SH-SY5Y cells were found to contain ataxin-3 oligomeric species and protein aggregates. Treatment with SB increased activity of the autophagy protein quality control pathway in the MJD cells, decreased presence of ataxin-3 aggregates and presence of ataxin-3 oligomers in an autophagy-dependent manner. Treatment with SB was also beneficial in vivo, improving swimming performance, increasing autophagy activity and decreasing presence of insoluble ataxin-3 protein species in the transgenic MJD zebrafish. Co-treating the MJD zebrafish with SB and chloroquine, an autophagy inhibitor, prevented the beneficial effects of SB on the zebrafish swimming, suggesting that the improved swimming performance was autophagy-dependent. To identify mechanism of the induction of autophagy by SB, we performed proteomic analysis of protein lysates from the SB treated and untreated MJD SH-SY5Y cells. We found that SB treatment had increased activity of Protein Kinase A and AMPK signaling. Immunoblot analysis confirmed that SB treatment had increased levels of acetylated FOXO1 protein. Further, co-treatment with an inhibitor of FOXO1 transcriptional activity (AS1842856) prevented the increase in autophagosome formation (LC3II/I) usually produced by SB treatment. Together our findings indicate that treatment with SB can increase activity of the autophagy pathway through a FOXO1-dependent process and that this has beneficial effects in vitro and in vivo. We propose that treatment with sodium butyrate warrants further investigation for the treatment of neurodegenerative diseases underpinned by proteinopathy mechanisms, including MJD.

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Transcriptomics modification consecutive to AS1842856 treatment in primary T lymphocytes

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