Project description:The addition of 5uM retinoic acid to kidney organoids at day 12 (day 7+5). This data is from the same experimental batch as data within GSE119561.
Project description:Retinoic acid promotes the in vitro growth, patterning and improves the cellular composition of human pluripotent stem-cell-derived intestinal organoids
Project description:Liver fibrosis majorly impacts global health, necessitating development of in vitro models to study disease mechanisms and develop drug therapies. Relevant models should at least include hepatocytes and hepatic stellate cells (HSCs) and ideally use three-dimensional cultures to mimic in vivo conditions. Induced pluripotent stem cells (iPSCs) allow patient-specific liver modelling, but current models based on iPSC-derived hepatocytes (iHepatocytes) and HSCs (iHSCs) still lack key functions. We developed organoids of iHepatocytes and iHSCs, and compared them to HepaRG and primary HSC organoids. RNA-sequencing analysis comparison of these cultures identified a potential role for the transcription factor RXRA in hepatocyte differentiation and HSC quiescence. Treating cells with the RXRA ligand 9-cis-retinoic acid (9CRA) promoted iHepatocyte metabolism and iHSC quiescence. In organoids, 9CRA enhanced fibrotic response to TGF-β and acetaminophen, highlighting its potential for refining iPSC-based liver fibrosis models to more faithfully replicate human drug-induced liver injury and fibrotic conditions.
Project description:We are presenting the application of toxicogenomics in the evaluation of the toxic effects of retinoic acid and one of its isoforms the 9-cis retinoic acid. The main goal is to distinguish the pattern of action of the both chemical compounds and their action in an extended exposure. The results suggest a different pattern within the days and the chemicals. Representatives of each GO functional groups were selected and quantified by real-time PCR to validate the microarray data and to differentiate the action of retinoic acid compounds studied.
Project description:Retinoic Acid (RA) signaling is an important and conserved pathway that regulated cellular proliferation and differentiation. Furthermore, perturbed RA signaling is implicated in cancer initiation and progression. However, the mechanisms by which RA signaling contributes homeostasis malignant transformation and disease progression in the intestine, remain incompletely understood. Here, we show that activation of the Retinoic Acid Receptor and the Retinoid X Receptor results in enhanced transcription of enterocyte-specific genes in mouse small intestinal organoids. Conversely, inhibition of this pathway results in reduced expression of genes associated with the absorptive lineage. Strikingly, this latter effect is conserved in a human organoid model for colorectal cancer (CRC) progression. We further show that the epigenome in metastatic organoids is less permissive for RXR binding compared to pre-metastatic organoids, resulting in reduced sensitivity for RA signaling perturbations. Finally, we show that reduced RXR target gene expression correlates with worse CRC prognosis, implying RA signaling as a putative therapeutic strategy in CRC.
Project description:Comparison of gene expressions among osteogenic differentiated cells with retinoic acid, those without retinoic acid and cells before induction