Reprogramming of primary human hepatocytes (PHHs) into hCLiPs
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ABSTRACT: PHHs were cultured in the presence of small molecules and converted to proliferative progenitor cells named human chemcically induced progenitors (hCLiPs).
Project description:The purpose of this experiment was to compared the transcriptome of hepatocyte-like cells (HLCs) generated in vitro and adult primary human hepatocytes (PHHs). HLCs were differentiated from either hESCs or hIPSCs using previously established protocols (Hannah et al 2013; Segeritz et al 2018). Undifferentiated hIPSCs were used as control to confirm differentiation status. PHHs were commercially sourced as well as freshly isolated from donors.
Project description:ChIP-sequencing was performed to explore the difference between the epigenetic profiles of hepatocyte-like cells (HLCs) generated in vitro and primary human hepatocytes (PHHs). HLCs were differentiated from hIPSCs and hESCs for 30 days, as previously reported (Hannan et al, 2013). PHHs were purchased from Biopredic. Chromatin was immunoprecipitated with antibodies against H3K27ac, H3K4me1, H3K27me3 and H3K4me3. Library preparation and sequencing were performed by the Wellcome Trust Sanger Institute DNA Sequencing Facility (Hinxton, UK). Sequencing was performed on an Illumina HiSeq v4 instrument to obtain paired-end reads with 75bp length.
Project description:Cell fate can be directly converted between differentiated cells by lineage reprogramming, thus generating multiple cell types across developmental lineages. However, lineage reprogramming is hindered by incomplete cell-fate conversion with residual initial cell identity and partial functions compared with the native counterparts. Here, we develop a high-fidelity reprogramming strategy, by mimicking the natural cell-fate changing route, thus permitting the production of functionally competent human hepatocytes from another cell type. We first converted fibroblasts into plastic hepatic progenitor-like cells (hHPLCs) and chemically induced them into mature hepatocytes. The molecular identity of human induced hepatocytes (hiHeps) are suggested a terminally differentiated state, resembling primary human hepatocytes (PHHs). Functionally, hiHeps were competent to replace PHHs for equivalent drug-metabolizing activities, toxicity prediction and hepatitis B virus infection. Remarkably, the stably robust expansion of hHPLCs allowed large-scale generation of mature hepatocytes. Our results demonstrate the necessity of taking a reprogramming step for plastic progenitors for efficient cell-fate conversion. This strategy is promising for the generation of other mature human cell types.
Project description:Cell fate can be directly converted between differentiated cells by lineage reprogramming, thus generating multiple cell types across developmental lineages. However, lineage reprogramming is hindered by incomplete cell-fate conversion with residual initial cell identity and partial functions compared with the native counterparts. Here, we develop a high-fidelity reprogramming strategy, by mimicking the natural cell-fate changing route, thus permitting the production of functionally competent human hepatocytes from another cell type. We first converted fibroblasts into plastic hepatic progenitor-like cells (hHPLCs) and chemically induced them into mature hepatocytes. The molecular identity of human induced hepatocytes (hiHeps) are suggested a terminally differentiated state, resembling primary human hepatocytes (PHHs). Functionally, hiHeps were competent to replace PHHs for equivalent drug-metabolizing activities, toxicity prediction and hepatitis B virus infection. Remarkably, the stably robust expansion of hHPLCs allowed large-scale generation of mature hepatocytes. Our results demonstrate the necessity of taking a reprogramming step for plastic progenitors for efficient cell-fate conversion. This strategy is promising for the generation of other mature human cell types.
Project description:Infant PHHs (IPHHs) and adult PHHs (APHHs) were cultured in the presence of FBS only or FAC, and their transcriptomic changes throughout the 2-week culture were assessed by mRNA microarray.
Project description:Primary human hepatocytes (PHHs) were cultured with or without a cocktail of four small molecules, Y-27632, PD0325901, A83-01 and CHIR99021 (termed YPAC), and their transcriptomes after a long-trm culture were compared.
Project description:Functional maintenance of terminally differentiated cells outside the in vivo microenvironment has proved challenging. Current strategies that manipulate cell-cell or cell-matrix connections are difficult to constitute complex regulatory networks for cell function maintenance. Small molecules are easily combined for flexible spatiotemporal modulations, theoretically favorable for synergetic regulation of cell-innate signaling pathways to maintain cell function in vitro. Here, we developed small-molecule cocktails enabling robust maintenance of primary human hepatocytes (PHHs) longer than four weeks, with gene expression profiles, resembling those of freshly isolated PHHs; and prolong-cultured PHHs, for the first time, could maintain drug-metabolizing activities of enzymes accounting for over 80% of drug-oxidation and support hepatitis B virus infection in vitro for over one month. Our study demonstrates that this chemical approach effectively maintains terminally differentiated hepatocytes in vitro, which could be extended to various cell types.