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Journal ArticleDOI

Embryonic ductal plate cells give rise to cholangiocytes, periportal hepatocytes, and adult liver progenitor cells.

TL;DR: It was found that liver homeostasis required a continuous supply of cells from SOX9-expressing progenitors, and cells that express the SRY-related HMG box transcription factor 9 (SOX9) were proposed to continuously supply the liver with hepatic cells.
About: This article is published in Gastroenterology.The article was published on 2011-10-01 and is currently open access. It has received 245 citations till now. The article focuses on the topics: Canals of Hering & Intrahepatic bile ducts.
Citations
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Journal ArticleDOI
TL;DR: Evidence supporting and refuting whether self-renewable and bipotential liver stem cells exist in development, homeostasis, regeneration, and disease is discussed.

452 citations

Journal ArticleDOI
TL;DR: Recent advances in the generation of pluripotent stem cell- and AdSC-derived organoids are discussed, highlighting their potential for enhancing the understanding of human development and how this new culture system allows disease modeling and gene repair for a personalized regenerative medicine approach.
Abstract: In vitro three-dimensional (3D) cultures are emerging as novel systems with which to study tissue development, organogenesis and stem cell behavior ex vivo. When grown in a 3D environment, embryonic stem cells (ESCs) self-organize into organoids and acquire the right tissue patterning to develop into several endoderm- and ectoderm-derived tissues, mimicking their in vivo counterparts. Tissue-resident adult stem cells (AdSCs) also form organoids when grown in 3D and can be propagated in vitro for long periods of time. In this Review, we discuss recent advances in the generation of pluripotent stem cell- and AdSC-derived organoids, highlighting their potential for enhancing our understanding of human development. We will also explore how this new culture system allows disease modeling and gene repair for a personalized regenerative medicine approach.

384 citations


Cites background from "Embryonic ductal plate cells give r..."

  • ...Indeed, extensive lineage tracing approaches indicate that the contribution of progenitor cells to the normal homeostasis is negligible, at least in mouse models (Carpentier et al., 2011; Schaub et al., 2014; Tarlow et al., 2014; Yanger et al., 2014)....

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Journal ArticleDOI
13 Aug 2015-Cell
TL;DR: A pre-existing population of periportal hepatocytes, located in the portal triads of healthy livers and expressing low amounts of Sox9 and other bile-duct-enriched genes, undergo extensive proliferation and replenish liver mass after chronic hepatocyte-depleting injuries and represent a unique way to restore tissue function and avoid tumorigenesis.

384 citations


Cites background from "Embryonic ductal plate cells give r..."

  • ...and tubule formation, suggesting that HybHP and BD may originate from a common embryonic progenitor located at the ductal plate (Carpentier et al., 2011)....

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  • ...See also Figure S7. and tubule formation, suggesting that HybHP and BD may originate from a common embryonic progenitor located at the ductal plate (Carpentier et al., 2011)....

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  • ...…estimated efficiency of 51.4% (Figure 1F; 4,968 YFP+ hepatocytes out of 217,975 hepatocytes, n = 3), mirroring what was observed with the Sox9-GFP transgene (Figures 1A–1C) and inconsistent with the SOX9 expression pattern of wild-type (WT) mice given high tamoxifen doses (Carpentier et al., 2011)....

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  • ...4% (Figure 1F; 4,968 YFP hepatocytes out of 217,975 hepatocytes, n = 3), mirroring what was observed with the Sox9-GFP transgene (Figures 1A–1C) and inconsistent with the SOX9 expression pattern of wild-type (WT) mice given high tamoxifen doses (Carpentier et al., 2011)....

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Journal ArticleDOI
TL;DR: It is reported that, contrary to prevailing stem-cell-based models of regeneration, virtually all new hepatocytes come from preexisting hepatocytes.

360 citations


Cites methods or result from "Embryonic ductal plate cells give r..."

  • ...A choline-deficient diet (MP Biomedicals) supplemented with 0.15% ethionine drinking water (Sigma-Aldrich, E5139) was administered for 2 weeks as described elsewhere (Carpentier et al., 2011), followed by 2 weeks of recovery....

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  • ...Indeed, when we tested the specificity of the same Sox9-CreER strain used by Furuyama and colleagues (Soeda et al., 2010) with a R26YFP reporter, we found that this strain confers substantial hepatocyte labeling (Figure S4)....

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  • ...As a ‘‘terminal’’ biliary marker, Krt19 appears to be an exception to this specificity problem; in contrast to Sox9 and OPN, Krt19 is not expressed by hepatocytes on injury, and hepatocytes become Krt19+ only after prolonged toxin exposure as part of a hepatocyte-to-BEC reprogramming process (Yanger et al., 2013)....

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  • ...Considering that Krt19 staining overlaps completely with staining for these BEC markers (353/353 Sox9+ cells, n = 3; 352/ 352 OPN+ cells, n = 3; and 349/349 HNF1b+ cells, n = 2), these results suggest that tamoxifen treatment of Krt19-CreER/ R26YFP mice results in specific labeling of BECs, including the putative progenitor cells that reside within the Canals of Hering....

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  • ...This analysis showed that colabeling occurred with a similar efficiency to that observed with Krt19, as 39.5% of Sox9+ cells (n = 3), 31.6% of osteopontin+ (Opn+) cells (n = 3), and 40.8% of HNF1b+ cells (n = 3) were labeled (Figure 1C)....

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Journal ArticleDOI
TL;DR: The regenerative mechanisms employed by hepatic cells after liver injury as well as the experimental models used to investigate these mechanisms are described and the clinical implications are discussed.
Abstract: The liver is the only solid organ that uses regenerative mechanisms to ensure that the liver-to-bodyweight ratio is always at 100% of what is required for body homeostasis. Other solid organs (such as the lungs, kidneys and pancreas) adjust to tissue loss but do not return to 100% of normal. The current state of knowledge of the regenerative pathways that underlie this ‘hepatostat’ will be presented in this Review. Liver regeneration from acute injury is always beneficial and has been extensively studied. Experimental models that involve partial hepatectomy or chemical injury have revealed extracellular and intracellular signalling pathways that are used to return the liver to equivalent size and weight to those prior to injury. On the other hand, chronic loss of hepatocytes, which can occur in chronic liver disease of any aetiology, often has adverse consequences, including fibrosis, cirrhosis and liver neoplasia. The regenerative activities of hepatocytes and cholangiocytes are typically characterized by phenotypic fidelity. However, when regeneration of one of the two cell types fails, hepatocytes and cholangiocytes function as facultative stem cells and transdifferentiate into each other to restore normal liver structure. Liver recolonization models have demonstrated that hepatocytes have an unlimited regenerative capacity. However, in normal liver, cell turnover is very slow. All zones of the resting liver lobules have been equally implicated in the maintenance of hepatocyte and cholangiocyte populations in normal liver. The liver has a broad range of regenerative capacities. In this Review, Michalopoulos and Bhushan describe the regenerative mechanisms employed by hepatic cells after liver injury as well as the experimental models used to investigate these mechanisms and discuss the clinical implications.

331 citations

References
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Journal ArticleDOI
TL;DR: In contrast to existing lacZ reporter lines, where lacZ expression cannot easily be detected in living tissue, the EYFP and ECFP reporter strains are useful for monitoring the expression of Cre and tracing the lineage of these cells and their descendants in cultured embryos or organs.
Abstract: Background Several Cre reporter strains of mice have been described, in which a lacZ gene is turned on in cells expressing Cre recombinase, as well as their daughter cells, following Cre-mediated excision of a loxP-flanked transcriptional "stop" sequence. These mice are useful for cell lineage tracing experiments as well as for monitoring the expression of Cre transgenes. The green fluorescent protein (GFP) and variants such as EYFP and ECFP offer an advantage over lacZ as a reporter, in that they can be easily visualized without recourse to the vital substrates required to visualize β-gal in living tissue.

2,941 citations

Journal ArticleDOI
TL;DR: It is shown that Sox9 is expressed throughout the biliary and pancreatic ductal epithelia, which are connected to the intestinal stem-cell zone, which suggests interdependence between the structure and homeostasis of endodermal organs, with Sox9 expression being linked to progenitor status.
Abstract: The liver and exocrine pancreas share a common structure, with functioning units (hepatic plates and pancreatic acini) connected to the ductal tree. Here we show that Sox9 is expressed throughout the biliary and pancreatic ductal epithelia, which are connected to the intestinal stem-cell zone. Cre-based lineage tracing showed that adult intestinal cells, hepatocytes and pancreatic acinar cells are supplied physiologically from Sox9-expressing progenitors. Combination of lineage analysis and hepatic injury experiments showed involvement of Sox9-positive precursors in liver regeneration. Embryonic pancreatic Sox9-expressing cells differentiate into all types of mature cells, but their capacity for endocrine differentiation diminishes shortly after birth, when endocrine cells detach from the epithelial lining of the ducts and form the islets of Langerhans. We observed a developmental switch in the hepatic progenitor cell type from Sox9-negative to Sox9-positive progenitors as the biliary tree develops. These results suggest interdependence between the structure and homeostasis of endodermal organs, with Sox9 expression being linked to progenitor status.

772 citations

Journal ArticleDOI
TL;DR: The basic molecular mechanisms that control the formation of the liver as an organ are reviewed.

683 citations

Journal ArticleDOI
TL;DR: This international group of liver pathologists and hepatologists seeks to arrive at a consensus on nomenclature for normal human livers and human reactive lesions that can facilitate more rapid advancement of the field.

642 citations

Journal ArticleDOI
TL;DR: The self-renewal capacity of hHpSCs is indicated by phenotypic stability after expansion for >150 population doublings in a serum-free, defined medium and with a doubling time of ∼36 h, and they are candidates for liver cell therapies.
Abstract: Human hepatic stem cells (hHpSCs), which are pluripotent precursors of hepatoblasts and thence of hepatocytic and biliary epithelia, are located in ductal plates in fetal livers and in Canals of Hering in adult livers. They can be isolated by immunoselection for epithelial cell adhesion molecule–positive (EpCAM+) cells, and they constitute ∼0.5–2.5% of liver parenchyma of all donor ages. The self-renewal capacity of hHpSCs is indicated by phenotypic stability after expansion for >150 population doublings in a serum-free, defined medium and with a doubling time of ∼36 h. Survival and proliferation of hHpSCs require paracrine signaling by hepatic stellate cells and/or angioblasts that coisolate with them. The hHpSCs are ∼9 μm in diameter, express cytokeratins 8, 18, and 19, CD133/1, telomerase, CD44H, claudin 3, and albumin (weakly). They are negative for α-fetoprotein (AFP), intercellular adhesion molecule (ICAM) 1, and for markers of adult liver cells (cytochrome P450s), hemopoietic cells (CD45), and mesenchymal cells (vascular endothelial growth factor receptor and desmin). If transferred to STO feeders, hHpSCs give rise to hepatoblasts, which are recognizable by cordlike colony morphology and up-regulation of AFP, P4503A7, and ICAM1. Transplantation of freshly isolated EpCAM+ cells or of hHpSCs expanded in culture into NOD/SCID mice results in mature liver tissue expressing human-specific proteins. The hHpSCs are candidates for liver cell therapies.

573 citations

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