1
|
Mitaka T, Ichinohe N, Tanimizu N. "Small Hepatocytes" in the Liver. Cells 2023; 12:2718. [PMID: 38067145 PMCID: PMC10705974 DOI: 10.3390/cells12232718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 11/17/2023] [Accepted: 11/21/2023] [Indexed: 12/18/2023] Open
Abstract
Mature hepatocytes (MHs) in an adult rodent liver are categorized into the following three subpopulations based on their proliferative capability: type I cells (MH-I), which are committed progenitor cells that possess a high growth capability and basal hepatocytic functions; type II cells (MH-II), which possess a limited proliferative capability; and type III cells (MH-III), which lose the ability to divide (replicative senescence) and reach the final differentiated state. These subpopulations may explain the liver's development and growth after birth. Generally, small-sized hepatocytes emerge in mammal livers. The cells are characterized by being morphologically identical to hepatocytes except for their size, which is substantially smaller than that of ordinary MHs. We initially discovered small hepatocytes (SHs) in the primary culture of rat hepatocytes. We believe that SHs are derived from MH-I and play a role as hepatocytic progenitors to supply MHs. The population of MH-I (SHs) is distributed in the whole lobules, a part of which possesses a self-renewal capability, and decreases with age. Conversely, injured livers of experimental models and clinical cases showed the emergence of SHs. Studies demonstrate the involvement of SHs in liver regeneration. SHs that appeared in the injured livers are not a pure population but a mixture of two distinct origins, MH-derived and hepatic-stem-cell-derived cells. The predominant cell-derived SHs depend on the proliferative capability of the remaining MHs after the injury. This review will focus on the SHs that appeared in the liver and discuss the significance of SHs in liver regeneration.
Collapse
Affiliation(s)
- Toshihiro Mitaka
- Department of Tissue Development and Regeneration, Institute of Regenerative Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (N.I.); (N.T.)
| | - Norihisa Ichinohe
- Department of Tissue Development and Regeneration, Institute of Regenerative Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (N.I.); (N.T.)
| | - Naoki Tanimizu
- Department of Tissue Development and Regeneration, Institute of Regenerative Medicine, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan; (N.I.); (N.T.)
- Division of Regenerative Medicine, Center for Stem Cell Biology and Regenerative Medicine, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan
| |
Collapse
|
2
|
Liver Organoids, Novel and Promising Modalities for Exploring and Repairing Liver Injury. Stem Cell Rev Rep 2023; 19:345-357. [PMID: 36199007 PMCID: PMC9534590 DOI: 10.1007/s12015-022-10456-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/24/2022] [Indexed: 02/07/2023]
Abstract
The past decades have witnessed great advances in organoid technology. Liver is the biggest solid organ, performing multifaceted physiological functions. Nowadays, liver organoids have been applied in many fields including pharmaceutical research, precision medicine and disease models. Compared to traditional 2-dimensional cell line cultures and animal models, liver organoids showed the unique advantages. More importantly, liver organoids can well model the features of the liver and tend to be novel and promising modalities for exploring liver injury, thus finding potential treatment targets and repairing liver injury. In this review, we reviewed the history of the development of liver organoids and summarized the application of liver organoids and recent studies using organoids to explore and further repair the liver injury. These novel modalities could provide new insights about the process of liver injury.
Collapse
|
3
|
Abstract
Hepatocytes are liver parenchymal cells involved in performing various metabolic reactions. During the development of therapeutic drugs, toxicological assays are conducted using hepatocyte cultures before clinical trials. However, since primary hepatocytes cannot proliferate and rapidly lose their functions in vitro, many efforts have been put into modifying culture conditions to expand primary hepatocytes and induce hepatocyte functions in intrinsic and extrinsic stem/progenitor cells. In this chapter, we summarize recent advances in preparing hepatocyte cultures and induction of hepatocytes from various cellular sources.
Collapse
Affiliation(s)
- Ayumu Okumura
- Division of Regenerative Medicine, Center for Stem Cell Biology and Regenerative Medicine, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Naoki Tanimizu
- Division of Regenerative Medicine, Center for Stem Cell Biology and Regenerative Medicine, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan.
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan.
| |
Collapse
|
4
|
Ichinohe N, Tanimizu N, Mitaka T. Isolation of Small Hepatocyte-Like Progenitor Cells from Retrorsine/Partial Hepatectomy Rat Livers by Laser Microdissection. Methods Mol Biol 2022; 2544:183-193. [PMID: 36125719 DOI: 10.1007/978-1-0716-2557-6_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Small hepatocyte-like progenitor cells (SHPCs) are known as liver stem/progenitor cells (LSPCs). SHPCs transiently appear and form clusters in rat livers treated with retrorsine (Ret) and a 70% partial hepatectomy (PH). The Ret/PH model has been used widely to analyze the effectiveness of cell transplantation and the mechanisms of LSPC proliferation. Laser microdissection (LMD) is a powerful tool that can excise and collect specific areas of cells from a tissue slice with a laser under a microscope. These cells exhibiting morphological alterations different from the surrounding cells may be analyzed by gene expression profiling. Specific markers of SHPCs have not yet been identified, in part, because it is difficult to isolate SHPCs from the liver using fluorescence or magnetic-activated cell sorting. To examine the underlying mechanism for SHPC growth, we established comprehensive gene expression profiles for SHPCs captured from liver sections using LMD. In this chapter, we introduce a method to isolate SHPCs from liver tissue sections using LMD for gene expression analysis.
Collapse
Affiliation(s)
- Norihisa Ichinohe
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan.
| | - Naoki Tanimizu
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
- Division of Regenerative Medicine, Center for Stem Cell Biology and Regenerative Medicine, The Institute of Medical Science, University of Tokyo, Tokyo, Japan
| | - Toshihiro Mitaka
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| |
Collapse
|
5
|
Peng WC, Kraaier LJ, Kluiver TA. Hepatocyte organoids and cell transplantation: What the future holds. Exp Mol Med 2021; 53:1512-1528. [PMID: 34663941 PMCID: PMC8568948 DOI: 10.1038/s12276-021-00579-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 01/11/2021] [Accepted: 01/14/2021] [Indexed: 12/29/2022] Open
Abstract
Historically, primary hepatocytes have been difficult to expand or maintain in vitro. In this review, we will focus on recent advances in establishing hepatocyte organoids and their potential applications in regenerative medicine. First, we provide a background on the renewal of hepatocytes in the homeostatic as well as the injured liver. Next, we describe strategies for establishing primary hepatocyte organoids derived from either adult or fetal liver based on insights from signaling pathways regulating hepatocyte renewal in vivo. The characteristics of these organoids will be described herein. Notably, hepatocyte organoids can adopt either a proliferative or a metabolic state, depending on the culture conditions. Furthermore, the metabolic gene expression profile can be modulated based on the principles that govern liver zonation. Finally, we discuss the suitability of cell replacement therapy to treat different types of liver diseases and the current state of cell transplantation of in vitro-expanded hepatocytes in mouse models. In addition, we provide insights into how the regenerative microenvironment in the injured host liver may facilitate donor hepatocyte repopulation. In summary, transplantation of in vitro-expanded hepatocytes holds great potential for large-scale clinical application to treat liver diseases.
Collapse
Affiliation(s)
- Weng Chuan Peng
- Princess Máxima Center for Pediatric Oncology, Heidelberglaan 25, 3584 CS, Utrecht, The Netherlands.
| | - Lianne J Kraaier
- Princess Máxima Center for Pediatric Oncology, Heidelberglaan 25, 3584 CS, Utrecht, The Netherlands
| | - Thomas A Kluiver
- Princess Máxima Center for Pediatric Oncology, Heidelberglaan 25, 3584 CS, Utrecht, The Netherlands
| |
Collapse
|
6
|
Ichinohe N, Ishii M, Tanimizu N, Mizuguchi T, Yoshioka Y, Ochiya T, Suzuki H, Mitaka T. Extracellular vesicles containing miR-146a-5p secreted by bone marrow mesenchymal cells activate hepatocytic progenitors in regenerating rat livers. Stem Cell Res Ther 2021; 12:312. [PMID: 34051870 PMCID: PMC8164814 DOI: 10.1186/s13287-021-02387-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 05/13/2021] [Indexed: 02/06/2023] Open
Abstract
Background Small hepatocyte-like progenitor cells (SHPCs) appear to form transient clusters in rat livers treated with retrorsine (Ret) and 70% partial hepatectomy (PH). We previously reported that the expansion of SHPCs was amplified in Ret/PH-treated rat livers transplanted with Thy1+ cells derived from d-galactosamine-treated injured livers. Extracellular vesicles (EVs) produced by hepatic Thy1+ donor cells activated SHPCs via interleukin (IL)-17 receptor B signaling. As bone marrow-derived mesenchymal cells (BM-MCs) also express Thy1, we aimed to determine whether BM-MCs could also promote the growth of SHPCs. Methods BM-MCs were isolated from dipeptidyl-peptidase IV (DPPIV)-positive rats. BM-MCs or BM-MC-derived EVs were administered to DPPIV-negative Ret/PH rat livers, and the growth and the characteristics of SHPC clusters were evaluated 14 days post-treatment. miRNA microarrays and cytokine arrays examined soluble factors within EVs. Small hepatocytes (SHs) isolated from an adult rat liver were used to identify factors enhancing hepatocytic progenitor cells growth. Results The recipient’s livers were enlarged at 2 weeks post-BM-MC transplantation. The number and the size of SHPCs increased remarkably in livers transplanted with BM-MCs. BM-MC-derived EVs also stimulated SHPC growth. Comprehensive analyses revealed that BM-MC-derived EVs contained miR-146a-5p, interleukin-6, and stem cell factor, which could enhance SHs’ proliferation. Administration of EVs derived from the miR-146a-5p-transfected BM-MCs to Ret/PH rat livers remarkably enhanced the expansion of SHPCs. Conclusions miR-146a-5p involved in EVs produced by BM-MCs may play a major role in accelerating liver regeneration by activating the intrinsic hepatocytic progenitor cells. Supplementary Information The online version contains supplementary material available at 10.1186/s13287-021-02387-6.
Collapse
Affiliation(s)
- Norihisa Ichinohe
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo, 060-8556, Japan.
| | - Masayuki Ishii
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo, 060-8556, Japan.,Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Naoki Tanimizu
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo, 060-8556, Japan
| | - Toru Mizuguchi
- Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo, Japan.,Department of Nursing, Sapporo Medical University School of Health Science, Sapporo, Japan
| | - Yusuke Yoshioka
- Division of Molecular and Cellular Medicine, National Cancer Center Research Institute, Tokyo, Japan.,Department of Molecular and Cellular Medicine, Institute of Medical Science, Tokyo Medical University, Tokyo, Japan
| | - Takahiro Ochiya
- Division of Molecular and Cellular Medicine, National Cancer Center Research Institute, Tokyo, Japan.,Department of Molecular and Cellular Medicine, Institute of Medical Science, Tokyo Medical University, Tokyo, Japan
| | - Hiromu Suzuki
- Department of Molecular Biology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Toshihiro Mitaka
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo, 060-8556, Japan.
| |
Collapse
|
7
|
Zivko C, Fuhrmann G, Luciani P. Liver-derived extracellular vesicles: A cell by cell overview to isolation and characterization practices. Biochim Biophys Acta Gen Subj 2021; 1865:129559. [DOI: 10.1016/j.bbagen.2020.129559] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 01/16/2020] [Accepted: 02/11/2020] [Indexed: 02/08/2023]
|
8
|
Delgado-Coello B. Liver regeneration observed across the different classes of vertebrates from an evolutionary perspective. Heliyon 2021; 7:e06449. [PMID: 33748499 PMCID: PMC7970152 DOI: 10.1016/j.heliyon.2021.e06449] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 02/17/2021] [Accepted: 03/04/2021] [Indexed: 12/24/2022] Open
Abstract
The liver is a key organ that performs diverse functions such as metabolic processing of nutrients or disposal of dangerous substances (xenobiotics). Accordingly, it seems to be protected by several mechanisms throughout the life of organisms, one of which is compensatory hyperplasia, also known as liver regeneration. This review is a recapitulation of the scientific reports describing the different ways in which the various classes of vertebrates deal with liver injuries, where since mammals have an improved molecular toolkit, exhibit optimized regeneration of the liver compared to lower vertebrates. The main molecules involved in the compensatory process, such as proinflammatory and inhibitory cytokines, are analyzed across vertebrates with an evolutionary perspective. In addition, the possible significance of this mechanism is discussed in the context of the long life span of vertebrates, especially in the case of mammals.
Collapse
Affiliation(s)
- Blanca Delgado-Coello
- Departamento de Bioquímica y Biología Estructural, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Apdo. Postal 70-243, C.P. 04510, Mexico City, Mexico
| |
Collapse
|
9
|
Identification and ultrastructural characterization of small hepatocyte-like cells in birds. Tissue Cell 2020; 67:101426. [PMID: 32835934 DOI: 10.1016/j.tice.2020.101426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 08/12/2020] [Accepted: 08/12/2020] [Indexed: 11/22/2022]
Abstract
Small hepatocytes (SH) have been identified in regenerative organs and have been proposed to be hepatocyte progenitor cells. Their characteristic presence in birds, and their maturation into functional and mature hepatocytes, have not yet been elucidated. We previously demonstrated the appearance of chicken SH, which express CD44, in a model of chicken hepatopathy treated with bile duct ligation (BDL). We expanded on our previous research and performed a detailed study of the ultrastructure of chicken SH. Four weeks after BDL, we observed chicken SH with high electron density cytoplasm and with colony formation. In the chicken SH, electron microscopical analysis found no formation of tight junctions and no glycogen. Ultrastructural analysis also revealed the existence of various types of chicken SH with characteristics lying between those of chicken SH with colony formation and mature hepatocytes. The analysis of immunoelectron microscopy showed CD44 expressed on the surface of the extensive SH-like cells in the hepatic lamina. These results suggest that the expression of CD44 changes according to the differentiated stage of SH in a chicken BDL model.
Collapse
|
10
|
Nitta S, Kusakari Y, Yamada Y, Kubo T, Neo S, Igarashi H, Hisasue M. Conversion of mesenchymal stem cells into a canine hepatocyte-like cells by Foxa1 and Hnf4a. Regen Ther 2020; 14:165-176. [PMID: 32123700 PMCID: PMC7038439 DOI: 10.1016/j.reth.2020.01.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 01/17/2020] [Accepted: 01/23/2020] [Indexed: 12/18/2022] Open
Abstract
Introduction Hepatocytes, which account for the majority of liver tissue, are derived from the endoderm and become hepatocytes via differentiation of hepatic progenitor cells. Induced hepatocyte-like (iHep) cells and artificial liver tissues are expected to become useful, efficient therapies for severe and refractory liver diseases and to contribute to drug discovery research. The establishment of iHep cell lines are needed to carry out liver transplants and assess liver toxicity in the rising number of dogs affected by liver disease. Recently, direct conversion of non-hepatocyte cells into iHep cells was achieved by transfecting mouse adult fibroblasts with the Forkhead box protein A1 (Foxa1) and hepatocyte nuclear factor 4 homeobox alpha (Hnf4α) genes. Here, we applied this conversion process for the differentiation of canine bone marrow stem cells (cBMSCs) into hepatocyte-like cells. Methods Bone marrow specimens were collected from four healthy Beagle dogs and used to culture cBMSCs in Dulbecco's Modified Eagle's Medium (DMEM). The cBMSCs displayed the following characteristic features: plastic adherence; differentiation into adipocytes, osteoblasts and chondrocytes; and a cell surface antigen profile of CD29 (+), CD44 (+), CD90 (+), CD45 (−), CD34 (−) and CD14 (−), or CD11b (−) and CD79a (−), or CD19 (−) and HLA class II(−). The cBMSCs were seeded in a collagen I-coated plate and cultured in DMEM with 10% fetal bovine serum and transfected with retroviruses expressing Foxa1 and Hnf4α the following day. Canine iHep cells were differentiated from cBMSCs in culture on day 10, and were analyzed for morphology, RNA expression, immunocytochemistry, urea production, and low-density lipoprotein (LDL) metabolism. Results The cBMSCs expressed CD29 (98.06 ± 1.14%), CD44 (99.59 ± 0.27%) and CD90 (92.78 ± 4.89%), but did not express CD14 (0.47 ± 0.29%), CD19 (0.44 ± 0.39%), CD34 (0.33 ± 0.25%), CD45 (0.46 ± 0.34%) or MHC class II (0.54 ± 0.40%). The iHep cells exhibited morphology that included circular to equilateral circular shapes, and the formation of colonies that adhered to each other 10 days after Foxa1 and Hnf4α transfection. Quantitative RT-PCR analysis showed that the expression levels of the genes encoding albumin (ALB) and cadherin (CDH) in iHep cells on day 10 were increased approximately 100- and 10,000-fold, respectively, compared with cBMSCs. Corresponding protein expression of ALB and epithelial-CDH was confirmed by immunocytochemistry. Important hepatic functions, including LDL metabolic ability and urea production, were increased in iHep cells on day 10. Conclusion We successfully induced cBMSCs to differentiate into functional iHep cells. To our knowledge, this is the first report of canine liver tissue differentiation using Foxa1 and Hnf4α gene transfection. Canine iHep cells are expected to provide insights for the construction of liver models for drug discovery research and may serve as potential therapeutics for canine liver disease.
Collapse
Affiliation(s)
- Suguru Nitta
- Laboratory of Small Animal Internal Medicine, School of Veterinary Medicine, Azabu University, Sagamihara City, Kanagawa, Japan
| | - Yuto Kusakari
- Laboratory of Small Animal Internal Medicine, School of Veterinary Medicine, Azabu University, Sagamihara City, Kanagawa, Japan
| | - Yoko Yamada
- Laboratory of Small Animal Internal Medicine, School of Veterinary Medicine, Azabu University, Sagamihara City, Kanagawa, Japan
| | - Takeaki Kubo
- Celltrust Animal Therapeutics Co., Ltd, Yokohama City, Kanagawa, Japan
| | - Sakurako Neo
- Clinical Diagnostics, School of Veterinary Medicine, Azabu University, Sagamihara City, Kanagawa, Japan
| | - Hirotaka Igarashi
- Laboratory of Small Animal Internal Medicine, School of Veterinary Medicine, Azabu University, Sagamihara City, Kanagawa, Japan
| | - Masaharu Hisasue
- Laboratory of Small Animal Internal Medicine, School of Veterinary Medicine, Azabu University, Sagamihara City, Kanagawa, Japan
| |
Collapse
|
11
|
Successful energy shift from glycolysis to mitochondrial oxidative phosphorylation in freshly isolated hepatocytes from humanized mice liver. Toxicol In Vitro 2020; 65:104785. [PMID: 31991145 DOI: 10.1016/j.tiv.2020.104785] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 01/25/2020] [Accepted: 01/25/2020] [Indexed: 11/21/2022]
Abstract
Mitochondrial toxicity is a factor of drug-induced liver injury. Previously, we reported an in vitro rat hepatocyte assay where mitochondrial toxicity was more sensitively evaluated, using sugar resource substitution and increased oxygen supply. Although this method could be applicable to human cell-based assay, cryopreserved human hepatocyte (CHH) has some disadvantages/uncertainty, including unstable same donor supply and potential organelle damage due to cryopreservation. Herein, we compared the mitochondrial functions of freshly-isolated hepatocytes from humanized chimeric mice liver (PXB-cells) and three CHH lots to determine the better cell source for mitochondrial toxicity assay. Two CHH lots declined after replacing glucose with galactose. To confirm the shift in energy production from glycolysis to oxidative phosphorylation, lactate and oxygen consumption rate (indicators of glycolytic activity and mitochondrial oxidative phosphorylation, respectively) were measured. In PXB-cells, lactate amount decreased, while oxygen consumption in 100 min increased. These effects were less evident in CHH. The cytotoxicity of the select respiratory chain inhibitors was enhanced in PXB-cells upon sugar replacement, but no change occurred with negative control drugs (bicalutamide and metformin). Altogether, PXB-cells was less vulnerable to sugar resource substitution than CHH. The substitution activated mitochondrial function and enhanced cytotoxicity of respiratory chain inhibitors in PXB-cells.
Collapse
|
12
|
Fukasawa H, Hashimoto H, Hiramoto K, Sugiyama M, Taniguchi K, Yoshioka K. Morphological characterization of small hepatocytes after bile duct ligation in chicken. Poult Sci 2019; 98:717-721. [DOI: 10.3382/ps/pey455] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 09/05/2018] [Indexed: 01/01/2023] Open
|
13
|
Abstract
This protocol showed procedures to isolate and expand small hepatocytes (SHs), as hepatocytic progenitor cells, from a rat liver. SHs are identified as a subpopulation of mature hepatocytes in a healthy liver. SHs can proliferate to form colonies in serum-free medium on hyaluronic acid-coated dishes, of which cells show CD44 positivity (CD44+ SHs). CD44+ SHs can be separated and purified from colonies by using anti-CD44 antibodies after enzymatic dissociation. CD44+ SHs can proliferate to form colonies on Engelbreth-Holm-Swarm gel (EHS-gel)-coated dishes in the serum-free medium for a long period and subculture for several times. Even after the second passage, the cells possess characteristics of hepatocytes such as expression of albumin and HNF4α. In addition, when the cells are treated with EHS-gel, they can recover highly differentiated functions of hepatocytes such as glycogen production, CYP activity, and bile secretion.
Collapse
|
14
|
Katsuda T, Ochiya T. Biological and clinical insights offered by chemically induced liver progenitors (CLiPs). Stem Cell Investig 2017; 4:68. [PMID: 28920061 DOI: 10.21037/sci.2017.08.04] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 07/21/2017] [Indexed: 01/20/2023]
Affiliation(s)
- Takeshi Katsuda
- Division of Molecular and Cellular Medicine, National Cancer Center Research Institute, Chuo-ku, Tokyo 104-0045, Japan
| | - Takahiro Ochiya
- Division of Molecular and Cellular Medicine, National Cancer Center Research Institute, Chuo-ku, Tokyo 104-0045, Japan
| |
Collapse
|
15
|
Fujii M, Yamanouchi K, Sakai Y, Baimakhanov Z, Yamaguchi I, Soyama A, Hidaka M, Takatsuki M, Kuroki T, Eguchi S. In vivo construction of liver tissue by implantation of a hepatic non-parenchymal/adipose-derived stem cell sheet. J Tissue Eng Regen Med 2017; 12:e287-e295. [PMID: 28109058 DOI: 10.1002/term.2424] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 12/01/2016] [Accepted: 01/17/2017] [Indexed: 12/16/2022]
Abstract
Subcutaneous hepatocyte sheet implantation is an attractive therapeutic option for various liver diseases. However, this technique is limited by the availability of hepatocytes. Thus, the use of hepatic non-parenchymal cells (NPCs) containing small hepatocytes, which have the ability to proliferate more rapidly than mature hepatocytes, for transplantation has been suggested. The aim of our study was to construct liver tissue subcutaneously in rats by implanting NPC sheets co-cultivated with adipose-derived stem cells (ADSCs), which produce certain angiogenic factors. We crafted NPC-ADSC sheets on temperature-responsive culture dishes. NPCs formed functioning bile canaliculi and stored glycogen. In addition, their ability to produce albumin was not inferior to that of hepatocytes. Albumin production increased over time when co-cultivated with ADSCs. We then implanted the co-cultivated cell sheets subcutaneously. The co-cultivated sheets retained glycogen, formed bile canaliculi, showed signs of vascularization and survived subcutaneously without pre-vascularization. These results suggest that NPCs can be a viable option in cell therapy for liver diseases. This technique using co-cultivated cell sheets may be useful in the field of regenerative medicine. Copyright © 2017 John Wiley & Sons, Ltd.
Collapse
Affiliation(s)
- Mio Fujii
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
| | - Kosho Yamanouchi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
| | - Yusuke Sakai
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
| | - Zhassulan Baimakhanov
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
| | - Izumi Yamaguchi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
| | - Akihiko Soyama
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
| | - Masaaki Hidaka
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
| | - Mitsuhisa Takatsuki
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
| | - Tamotsu Kuroki
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
| | - Susumu Eguchi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Nagasaki, Japan
| |
Collapse
|
16
|
Ishii M, Kino J, Ichinohe N, Tanimizu N, Ninomiya T, Suzuki H, Mizuguchi T, Hirata K, Mitaka T. Hepatocytic parental progenitor cells of rat small hepatocytes maintain self-renewal capability after long-term culture. Sci Rep 2017; 7:46177. [PMID: 28397810 PMCID: PMC5387414 DOI: 10.1038/srep46177] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 03/10/2017] [Indexed: 12/14/2022] Open
Abstract
The liver has a variety of functions for maintaining homeostasis, and hepatocytes play a major role. In contrast with the high regenerative capacity of mature hepatocytes (MHs) in vivo, they have not been successfully expanded ex vivo. Here we demonstrate that CD44-positive cells sorted from small hepatocyte (SH) colonies derived from a healthy adult rat liver can proliferate on a Matrigel-coated dish in serum-free chemically defined medium; in addition, a subpopulation of the cells can divide more than 50 times in a period of 17 weeks every 4-week-passage. The passage cells retained the capability to recover highly differentiated functions, such as glycogen storage, CYP activity and bile secretion. When Matrigel-treated cells from the third passage were transplanted into retrorsine/partial hepatectomy-treated rat livers, the cells engrafted to differentiate into MHs and cholangiocytes. These results suggest that long-term cultured CD44+ SHs retain hepatocytic characteristics in vitro and the capability to differentiate into hepatocytes and cholangiocytes in vivo. Thus, a newly identified subpopulation of MHs possessing the attributes of hepatocytic stem/progenitor cells can be passaged several times without losing hepatocytic characteristics.
Collapse
Affiliation(s)
- Masayuki Ishii
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo 060-8556, Japan
- Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo 060-8543, Japan
| | - Junichi Kino
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo 060-8556, Japan
- Tokushima Research Institute, Otsuka Pharmaceutical Co. Ltd., 463-10 Kagasuno, Kawauchi-cho, Tokushima 771-0192, Japan
| | - Norihisa Ichinohe
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo 060-8556, Japan
| | - Naoki Tanimizu
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo 060-8556, Japan
| | - Takafumi Ninomiya
- Department of Anatomy I, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo 060-8556, Japan
| | - Hiromu Suzuki
- Department of Molecular Biology, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo 060-8556, Japan
| | - Toru Mizuguchi
- Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo 060-8543, Japan
| | - Koichi Hirata
- Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo 060-8543, Japan
| | - Toshihiro Mitaka
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo 060-8556, Japan
| |
Collapse
|
17
|
The stellate cell system (vitamin A-storing cell system). Anat Sci Int 2017; 92:387-455. [PMID: 28299597 DOI: 10.1007/s12565-017-0395-9] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 02/15/2017] [Indexed: 01/18/2023]
Abstract
Past, present, and future research into hepatic stellate cells (HSCs, also called vitamin A-storing cells, lipocytes, interstitial cells, fat-storing cells, or Ito cells) are summarized and discussed in this review. Kupffer discovered black-stained cells in the liver using the gold chloride method and named them stellate cells (Sternzellen in German) in 1876. Wake rediscovered the cells in 1971 using the same gold chloride method and various modern histological techniques including electron microscopy. Between their discovery and rediscovery, HSCs disappeared from the research history. Their identification, the establishment of cell isolation and culture methods, and the development of cellular and molecular biological techniques promoted HSC research after their rediscovery. In mammals, HSCs exist in the space between liver parenchymal cells (PCs) or hepatocytes and liver sinusoidal endothelial cells (LSECs) of the hepatic lobule, and store 50-80% of all vitamin A in the body as retinyl ester in lipid droplets in the cytoplasm. SCs also exist in extrahepatic organs such as pancreas, lung, and kidney. Hepatic (HSCs) and extrahepatic stellate cells (EHSCs) form the stellate cell (SC) system or SC family; the main storage site of vitamin A in the body is HSCs in the liver. In pathological conditions such as liver fibrosis, HSCs lose vitamin A, and synthesize a large amount of extracellular matrix (ECM) components including collagen, proteoglycan, glycosaminoglycan, and adhesive glycoproteins. The morphology of these cells also changes from the star-shaped HSCs to that of fibroblasts or myofibroblasts.
Collapse
|
18
|
Ichinohe N, Ishii M, Tanimizu N, Kon J, Yoshioka Y, Ochiya T, Mizuguchi T, Hirata K, Mitaka T. Transplantation of Thy1 + Cells Accelerates Liver Regeneration by Enhancing the Growth of Small Hepatocyte-Like Progenitor Cells via IL17RB Signaling. Stem Cells 2017; 35:920-931. [PMID: 27925343 DOI: 10.1002/stem.2548] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 10/31/2016] [Accepted: 11/13/2016] [Indexed: 01/08/2023]
Abstract
Small hepatocyte-like progenitor cells (SHPCs) transiently form clusters in rat livers treated with retrorsine (Ret)/70% partial hepatectomy (PH). When Thy1+ cells isolated from d-galactosamine-treated rat livers were transplanted into the livers of Ret/PH-treated rats, the mass of the recipient liver transiently increased during the first 30 days after transplantation, suggesting that liver regeneration was enhanced. Here we addressed how Thy1+ cell transplantation stimulates liver regeneration. We found that the number and size of SHPC clusters increased in the liver at 14 days after transplantation. GeneChip analysis revealed that interleukin 17 receptor b (IL17rb) expression significantly increased in SHPCs from livers transplanted with Thy1+ cells. We subsequently searched for ligand-expressing cells and found that sinusoidal endothelial cells (SECs) and Kupffer cells expressed Il17b and Il25, respectively. Moreover, extracellular vesicles (EVs) separated from the conditioned medium of Thy1+ cell culture induced IL17b and IL25 expression in SECs and Kupffer cells, respectively. Furthermore, EVs enhanced IL17rb expression in small hepatocytes (SHs), which are hepatocytic progenitor cells; in culture, IL17B stimulated the growth of SHs. These results suggest that Thy1-EVs coordinate IL17RB signaling to enhance liver regeneration by targeting SECs, Kupffer cells, and SHPCs. Indeed, the administration of Thy1-EVs increased the number and size of SHPC clusters in Ret/PH-treated rat livers. Sixty days post-transplantation, most expanded SHPCs entered cellular senescence, and the enlarged liver returned to its normal size. In conclusion, Thy1+ cell transplantation enhanced liver regeneration by promoting the proliferation of intrinsic hepatic progenitor cells via IL17RB signaling. Stem Cells 2017;35:920-931.
Collapse
Affiliation(s)
- Norihisa Ichinohe
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo, Japan
| | - Masayuki Ishii
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo, Japan.,Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Naoki Tanimizu
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo, Japan
| | - Junko Kon
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo, Japan
| | - Yusuke Yoshioka
- Division of Molecular and Cellular Medicine, National Cancer Center Research Institute, Tokyo, Japan
| | - Takahiro Ochiya
- Division of Molecular and Cellular Medicine, National Cancer Center Research Institute, Tokyo, Japan
| | - Toru Mizuguchi
- Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Koichi Hirata
- Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Toshihiro Mitaka
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo, Japan
| |
Collapse
|
19
|
Tanimizu N, Ichinohe N, Ishii M, Kino J, Mizuguchi T, Hirata K, Mitaka T. Liver Progenitors Isolated from Adult Healthy Mouse Liver Efficiently Differentiate to Functional Hepatocytes In Vitro and Repopulate Liver Tissue. Stem Cells 2016; 34:2889-2901. [PMID: 27375002 DOI: 10.1002/stem.2457] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 06/08/2016] [Accepted: 06/18/2016] [Indexed: 01/20/2023]
Abstract
It has been proposed that tissue stem cells supply multiple epithelial cells in mature tissues and organs. However, it is unclear whether tissue stem cells generally contribute to cellular turnover in normal healthy organs. Here, we show that liver progenitors distinct from bipotent liver stem/progenitor cells (LPCs) persistently exist in mouse livers and potentially contribute to tissue maintenance. We found that, in addition to LPCs isolated as EpCAM+ cells, liver progenitors were enriched in CD45- TER119- CD31- EpCAM- ICAM-1+ fraction isolated from late-fetal and postnatal livers. ICAM-1+ liver progenitors were abundant by 4 weeks (4W) after birth. Although their number decreased with age, ICAM-1+ liver progenitors existed in livers beyond that stage. We established liver progenitor clones derived from ICAM-1+ cells between 1 and 20W and found that those clones efficiently differentiated into mature hepatocytes (MHs), which secreted albumin, eliminated ammonium ion, stored glycogen, and showed cytochrome P450 activity. Even after long-term culture, those clones kept potential to differentiate to MHs. When ICAM-1+ clones were transplanted into nude mice after retrorsine treatment and 70% partial hepatectomy, donor cells were incorporated into liver plates and expressed hepatocyte nuclear factor 4α, CCAAT/enhancer binding protein α, and carbamoylphosphate synthetase I. Moreover, after short-term treatment with oncostatin M, ICAM-1+ clones could efficiently repopulate the recipient liver tissues. Our results indicate that liver progenitors that can efficiently differentiate to MHs exist in normal adult livers. Those liver progenitors could be an important source of new MHs for tissue maintenance and repair in vivo, and for regenerative medicine ex vivo. Stem Cells 2016;34:2889-2901.
Collapse
Affiliation(s)
- Naoki Tanimizu
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Norihisa Ichinohe
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Masayuki Ishii
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan.,Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Junichi Kino
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Toru Mizuguchi
- Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Koichi Hirata
- Department of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo, Japan.,Department of Surgery, JR Sapporo Hospital, Sapporo, Japan
| | - Toshihiro Mitaka
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| |
Collapse
|
20
|
Lu C, Xia J, Zhou Y, Lu X, Zhang L, Gou M, Li L, Zhang X, Ji H, Zhu K, Li L, Zhang J, Yu P, Yang J, Bu H, Shi Y. Loss of Gsα impairs liver regeneration through a defect in the crosstalk between cAMP and growth factor signaling. J Hepatol 2016; 64:342-351. [PMID: 26386161 DOI: 10.1016/j.jhep.2015.08.036] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 08/17/2015] [Accepted: 08/30/2015] [Indexed: 02/05/2023]
Abstract
BACKGROUND & AIMS The stimulatory G protein α subunit (Gsα) activates the cAMP-dependent pathway by stimulating the production of cAMP and participates in diverse cell processes. Aberrant expression of Gsα results in various pathophysiological disorders, including tumorigenesis, but little is known about its role in liver regeneration. METHODS We generated a hepatocyte-specific Gsα gene knockout mouse to demonstrate the essential role of Gsα in liver regeneration using a mouse model with 70% partial hepatectomy (PH) or an intraperitoneal injection of carbon tetrachloride (CCl4). RESULTS Gsα inactivation dramatically impaired liver regeneration and blocked proliferating hepatocytes in G1/S transition due to the simultaneous depression of cyclin-dependent kinase 2 (CDK2) and cyclin E1. Loss of Gsα led to a fundamental alteration in gene profiles. Among the altered signaling cascades, the MAPK/Erk pathway, which is downstream of growth factor signaling, was disrupted secondary to a defect in phosphorylated Raf1 (pRaf1), resulting in a deficiency in phosphorylated CREB (pCREB) and CDK2 ablation. The lack of pRaf1 also resulted in a failure to phosphorylate retinoblastoma, which releases and activates E2F1, and a decrease in cyclin E1. Although these factors could be phosphorylated through both Gsα and growth factor signaling, the unique function of Raf1 in the growth factor cascade collapsed in response to the lack of Gsα. CONCLUSION The growth factor signaling pathway that promotes hepatocyte proliferation is dependent on Gsα signaling. Loss of Gsα leads to a breakdown of the crosstalk between cAMP and growth factor signaling and dramatically impairs liver regeneration.
Collapse
Affiliation(s)
- Changli Lu
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China; Department of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Jie Xia
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Yongjie Zhou
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China; Key Laboratory of Transplant Engineering and Immunology, NHFPC, West China Hospital, Sichuan University, China
| | - Xufeng Lu
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Lei Zhang
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China; Key Laboratory of Transplant Engineering and Immunology, NHFPC, West China Hospital, Sichuan University, China
| | - Maling Gou
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, China
| | - Lei Li
- Department of Liver Surgery, West China Hospital, Sichuan University, Chengdu, China
| | - Xiaoyun Zhang
- Department of Liver Surgery, West China Hospital, Sichuan University, Chengdu, China
| | - Hongjie Ji
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China; Key Laboratory of Transplant Engineering and Immunology, NHFPC, West China Hospital, Sichuan University, China
| | - Keting Zhu
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China; Key Laboratory of Transplant Engineering and Immunology, NHFPC, West China Hospital, Sichuan University, China
| | - Li Li
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Jie Zhang
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Ping Yu
- Laboratory of Cell and Gene Therapy, West China Institute of Women and Children's Health, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Jiayin Yang
- Department of Liver Surgery, West China Hospital, Sichuan University, Chengdu, China
| | - Hong Bu
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China; Department of Pathology, West China Hospital, Sichuan University, Chengdu, China.
| | - Yujun Shi
- Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China; Key Laboratory of Transplant Engineering and Immunology, NHFPC, West China Hospital, Sichuan University, China.
| |
Collapse
|
21
|
Abstract
Liver stem/progenitor cells (LPCs) are defined as cells that supply two types of liver epithelial cells, hepatocytes and cholangiocytes, during development, cellular turnover, and regeneration. Hepatoblasts, which are fetal LPCs derived from endoderm stem cells, robustly proliferate and differentiate into hepatocytes and cholangiocytes during fetal life. Between mid-gestation and the neonatal period, some cholangiocytes function as LPCs. Although LPCs in adult livers can be enriched in cells positive for cholangiocyte markers, their tissue localization and functions in cellular turnover remain obscure. On the other hand, it is well known that liver regeneration under conditions suppressing hepatocyte proliferation is supported by LPCs, though their origin has not been clearly identified. Recently many groups took advantage of new techniques including prospective isolation of LPCs by fluorescence-activated cell sorting and genetic lineage tracing to facilitate our understanding of epithelial supply in normal and injured livers. Those works suggest that, in normal livers, the turnover of hepatocytes mostly depends on duplication of hepatocytes. It is also demonstrated that liver epithelial cells as well as LPCs have great plasticity and flexible differentiation capability to respond to various types of injuries by protecting or repairing liver tissues.
Collapse
Affiliation(s)
- Naoki Tanimizu
- Department of Tissue Development and Regeneration; Research Institute for Frontier Medicine; Sapporo Medical University School of Medicine; Sapporo, Japan
| | - Toshihiro Mitaka
- Department of Tissue Development and Regeneration; Research Institute for Frontier Medicine; Sapporo Medical University School of Medicine; Sapporo, Japan
| |
Collapse
|
22
|
Krause P, Unthan-Fechner K, Probst I, Koenig S. Cultured hepatocytes adopt progenitor characteristics and display bipotent capacity to repopulate the liver. Cell Transplant 2013; 23:805-17. [PMID: 23485196 DOI: 10.3727/096368913x664856] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Clinical studies have proved the therapeutic potential of hepatocyte transplantation as a promising alternative to whole organ liver transplantation in the treatment of hereditary or end-stage liver disease. However, donor shortage seriously restricts cell availability, and the lack of appropriate cell culture protocols for the storage and maintenance of donor cells constitutes a significant obstacle. The aim of this study was to stimulate mature hepatocytes in culture to multiply in vitro and track their fate on transplantation. Rat hepatocytes isolated nonenzymatically were cultured serum free for up to 10 days. They were stimulated into proliferation in the presence of growth factors and conditioned media from nonparenchymal and hepatocyte culture supernatants, as well as 10 mM lithium chloride (LiCl). Cell proliferation was assessed by determining DNA content. Additionally, the extent of cell differentiation was estimated using immunofluorescence staining of hepatic, biliary, progenitor, and mesenchymal markers and gene expression analyses. Transplantation studies were performed on the Fischer CD26-mutant rat following pretreatment with retrorsine and partial hepatectomy. Proliferating hepatocytes increasingly adopted precursor characteristics, expressing progenitor (OV6, CD133), hepatic lineage (CK18), biliary (CD49f, CK7, CK19), and mesenchymal (vimentin) markers. The supplement of LiCl further enhanced the proliferative capacity by 30%. Transplantation studies revealed extensive repopulation by large donor hepatocyte clusters. Furthermore, bile duct-like structures deriving from donor cells proved to be immunoreactive to ductular markers and formed in close proximity to endogenous bile ducts. Mature hepatocytes reveal their potential to "switch" between phenotypes, adopting progenitor characteristics during proliferation in vitro. Following transplantation, these "retrodifferentiated" cells further expanded in vivo, thereby generating bipotentially differentiated progenies (hepatocytes and bile duct-like structures). This apparent plasticity of mature hepatocytes may open new approaches for cell-based strategies to treat liver disease.
Collapse
Affiliation(s)
- Petra Krause
- Department of General and Visceral Surgery, University Medical Centre Goettingen, Goettingen, Germany
| | | | | | | |
Collapse
|
23
|
Ooe H, Chen Q, Kon J, Sasaki K, Miyoshi H, Ichinohe N, Tanimizu N, Mitaka T. Proliferation of rat small hepatocytes requires follistatin expression. J Cell Physiol 2012; 227:2363-70. [PMID: 21826650 DOI: 10.1002/jcp.22971] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Small hepatocytes (SHs) are a subpopulation of hepatocytes that have high growth potential in culture and can differentiate into mature hepatocytes (MHs). The activin (Act)/follistatin (Fst) system critically contributes to homeostasis of cell growth in the normal liver. ActA and ActB consist of two disulfide-linked Inhibin (Inh)β subunits, InhβA and InhβB, respectively. Fst binds to Act and blocks its bioactivity. In the present study we carried out the experiments to clarify how Fst regulates the proliferation of SHs. The gene expression was analyzed using DNA microarray analysis, reverse transcription-polymerase chain reaction (RT-PCR) and real-time PCR, and protein expression was examined by western blots, immunocytochemistry, and enzyme-linked immunosorbent assay. RT-PCR showed that Fst expression was high in SHs and low in MHs. Although the ActA expression was opposite to that of Fst, ActB expression was high in SHs and low in MHs and increased with time in culture. Fst protein was detected in the cytoplasm of SHs and secreted into the culture medium. ActB protein was also secreted into the medium. Although the exogenous administration of ActA and ActB apparently suppressed the proliferation of SHs, apoptosis of SHs was not induced by treatment with ActA or ActB. On the other hand, Fst treatment did not affect the colony formation of SHs but prevented the inhibitory effect of ActA. Neutralization by the anti-Fst antibody resulted in the suppression of DNA synthesis in SHs, and small hairpin RNA against Fst suppressed the expansion of SH colonies. In conclusion, Fst expression is necessary for the proliferation of SHs.
Collapse
Affiliation(s)
- Hidekazu Ooe
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | | | | | | | | | | | | | | |
Collapse
|
24
|
Nakamura N, Saeki K, Mitsumoto M, Matsuyama S, Nishio M, Saeki K, Hasegawa M, Miyagawa Y, Ohkita H, Kiyokawa N, Toyoda M, Akutsu H, Umezawa A, Yuo A. Feeder-free and serum-free production of hepatocytes, cholangiocytes, and their proliferating progenitors from human pluripotent stem cells: application to liver-specific functional and cytotoxic assays. Cell Reprogram 2012; 14:171-85. [PMID: 22384928 DOI: 10.1089/cell.2011.0064] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
We have established a serum- and feeder-free culture system for the efficient differentiation of multifunctional hepatocytes from human embryonic stem (ES) cells and three entirely different induced pluripotent stem (iPS) cells (including vector/transgene-free iPS cells generated using Sendai virus vector) without cell sorting and gene manipulation. The differentiation-inducing protocol consisted of a first stage; endoderm induction, second stage; hepatic initiation, and third stage; hepatic maturation. At the end of differentiation culture, hepatocytes induced from human pluripotent stem cells expressed hepatocyte-specific proteins, such as α-fetoprotein, albumin, α1 antitrypsin and cytochrome P450 (CYP3A4), at similar or higher levels compared with three control human hepatocyte or hepatic cell lines. These human iPS/ES cell-derived hepatocytes also showed mature hepatocyte functions: indocyanine green dye uptake (≈ 30%), storage of glycogen (>80%) and metabolic activity of CYP3A4. Furthermore, they produced a highly sensitive hepatotoxicity assay system for D-galactosamine as determined by the extracellular release of hepatocyte-specific enzymes. Hepatoprotective prostaglandin E1 attenuated this toxicity. Interestingly, bile duct-specific enzymes were also detected after drug treatment, suggesting the presence of bile-duct epithelial cells (cholangiocytes) in our culture system. Electron microscopic studies confirmed the existence of cholangiocytes, and an immunostaining study proved the presence of bipotential hepatoblasts with high potential for proliferation. Differentiated cells were transferrable onto new dishes, on which small-sized proliferating cells with hepatocyte markers emerged and expanded. Thus, our differentiation culture system provides mature functional hepatocytes, cholangiocytes, and their progenitors with proliferative potential from a wide variety of human pluripotent stem cells.
Collapse
Affiliation(s)
- Naoko Nakamura
- Department of Disease Control, Research Institute, National Center for Global Health and Medicine, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Ichinohe N, Kon J, Sasaki K, Nakamura Y, Ooe H, Tanimizu N, Mitaka T. Growth ability and repopulation efficiency of transplanted hepatic stem cells, progenitor cells, and mature hepatocytes in retrorsine-treated rat livers. Cell Transplant 2011; 21:11-22. [PMID: 21669046 DOI: 10.3727/096368911x580626] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Cell-based therapies as an alternative to liver transplantation have been anticipated for the treatment of potentially fatal liver diseases. Not only mature hepatocytes (MHs) but also hepatic stem/progenitor cells are considered as candidate cell sources. However, whether the stem/progenitor cells have an advantage to engraft and repopulate the recipient liver compared with MHs has not been comprehensively assessed. Therefore, we used Thy1(+) (oval) and CD44(+) (small hepatocytes) cells isolated from GalN-treated rat livers as hepatic stem and progenitor cells, respectively. Cells from dipeptidylpeptidase IV (DPPIV)(+) rat livers were transplanted into DPPIV(-) livers treated with retrorsine following partial hepatectomy. Both stem and progenitor cells could differentiate into hepatocytes in host livers. In addition, the growth of the progenitor cells was faster than that of MHs until days 14. However, their repopulation efficiency in the long term was very low, since the survival period of the progenitor cells was much shorter than that of MHs. Most foci derived from Thy1(+) cells disappeared within 2 months. Many cells expressed senescence-associated β-galactosidase in 33% of CD44-derived foci at day 60, whereas the expression was observed in 13% of MH-derived ones. The short life of the cells may be due to their cellular senescence. On the other hand, the incorporation of sinusoidal endothelial cells into foci and sinusoid formation, which might be correlated to hepatic maturation, was completed faster in MH-derived foci than in CD44-derived ones. The survival of donor cells may have a close relation to not only early integration into hepatic plates but also the differentiated state of the cells at the time of transplantation.
Collapse
Affiliation(s)
- Norihisa Ichinohe
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | | | | | | | | | | | | |
Collapse
|
26
|
Toward engineering of vascularized three-dimensional liver tissue equivalents possessing a clinically significant mass. Biochem Eng J 2010. [DOI: 10.1016/j.bej.2009.10.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
27
|
Song L, Wang H, Gao X, Shen K, Niu W, Qin X. Proliferation and differentiation potential of mouse adult hepatic progenitor cells cultured in vitro. Acta Biochim Biophys Sin (Shanghai) 2010; 42:122-8. [PMID: 20119623 DOI: 10.1093/abbs/gmp112] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
This study aimed to isolate the stem cells or progenitors, if exist, from normal adult mouse liver and investigate their potential of proliferation and differentiation. Hepatocytes were isolated by modified two-step liver perfusion method and centrifugation, and then cultured in modified serumcontaining DMEM for observation more than 60 days. Immunofluorescence technique was applied to check the hepatocytes and to examine the formation of colonies with albumin, alpha-fetoprotein (AFP) and cytokeratin 19 (CK19). Results showed that some hepatocytes that were strongly positive for hepatocyte specific markers albumin on Day 1 in culture, could be activated at Days 2-3, followed by rapid proliferation and formation of colonies. The colonies could expand continually for more than 60 days. On Day 5, all the cells in the colony expressed hepatic stem cell (HSC) markers AFP. With the time of culture, some cells in colonies lost ability to divide at Days 13-15, and differentiated into cells which had a large cytoplasm and some two nuclei, similar to the appearance of mature hepatocytes morphologically. These differentiated cells demonstrated strong expression of albumin. Around Day 30, some big cells appeared in colonies and expressed bile duct cell marker CK19. Therefore, this subpopulation of mouse hepatocytes could acquire some characteristics of immature hepatocytes and showed the profile of hepatic progenitor cells with a high proliferating ability and bi-potential of differentiation. They were isolated from normal adult mouse, hence, named adult hepatic progenitor cells (AHPCs). Mouse AHPCs may be used as an HSC model for hepatocytes transplantation and hepatopathy study.
Collapse
Affiliation(s)
- Lujun Song
- Department of General Surgery, Zhongshan Hospital, Institute of General Surgery, Fudan University, Shanghai, China
| | | | | | | | | | | |
Collapse
|
28
|
Preoperative Granulocyte-Colony Stimulating Factor (G-CSF) Treatment Improves Congested Liver Regeneration. J Surg Res 2010; 158:132-7. [DOI: 10.1016/j.jss.2008.09.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2008] [Revised: 08/05/2008] [Accepted: 09/02/2008] [Indexed: 01/22/2023]
|
29
|
|
30
|
Kon J, Ichinohe N, Ooe H, Chen Q, Sasaki K, Mitaka T. Thy1-positive cells have bipotential ability to differentiate into hepatocytes and biliary epithelial cells in galactosamine-induced rat liver regeneration. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 175:2362-71. [PMID: 19893024 DOI: 10.2353/ajpath.2009.080338] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In galactosamine (GalN)-induced rat liver injury, hepatic stem/progenitor cells, small hepatocytes (SHs) and oval cells, transiently appear in the initial period of liver regeneration. To clarify the relationship between SHs and oval cells, CD44(+) and Thy1(+) cells were sorted from GalN-treated livers and used as candidates for SHs and oval cells, respectively. Some Thy1(+) cells isolated 3 days after GalN-treatment (GalN-D3) formed CD44(+) cell colonies, but those from GalN-D2 could form few. GeneChip (Affymetrix, Inc, Santa Clara, CA) analysis of the sorted cells and cultured Thy1(+) cells suggested that hepatocytic differentiation progressed in the order Thy1(+) (GalN-D3), Thy1(+) cell colony (Thy1-C), and CD44(+) (GalN-D4) cells. When Thy1(+), Thy1-C, and CD44(+) cells were transplanted into retrorsine/PH rat livers, they could proliferate to form hepatocytic foci. At 30 days after transplantation most cells forming the foci derived from CD44(+) cells possessed C/EBPalpha(+) nuclei, whereas only a few cells derived from Thy1-C showed this positivity. When Thy1(+) (GalN-D3) cells were cultured between collagen gels in medium with hepatocyte growth factor(+)/dexamethasone(-)/dimethyl sulfoxide(-), ducts/cysts consisting of biliary epithelial cells appeared, whereas with CD44(+) and Thy1(+) (GalN-D2) cells they did not. Taken together, these results indicate that the commitment of Thy1(+) cells to differentiate into hepatocytes or biliary epithelial cells may occur between Day 2 and Day 3. Furthermore, some Thy1(+) cells may differentiate into hepatocytes via CD44(+) SHs.
Collapse
Affiliation(s)
- Junko Kon
- Department of Pathophysiology, Cancer Research Institute, Sapporo Medical University School of Medicine, Chuo-ku, Sapporo, Japan.
| | | | | | | | | | | |
Collapse
|
31
|
Abstract
The liver is an organ with vital functions, including the processing and storage of nutrients, maintenance of serum composition, detoxification and bile production. Over the last 10 years, there have been major advances in our understanding of the molecular and cellular mechanisms underlying liver development. These advances have been achieved through the use of knockout mice as well as through forward-genetics studies employing mutant fish. The examination of many such murine and piscine mutants with defects in liver formation and/or function have pinpointed numerous factors crucial for hepatic cell differentiation and growth. In addition, these studies have permitted the identification of several important liver-specific markers that allow the contributions of variouscell types to hepatogenesis to be monitored. This review summarizes our current state of knowledge of the shared molecular mechanisms that underlie liver development in species as diverse as fish and mice. A better molecular understanding of liver formation may provide new insights into both normal liver biology and liver disease.
Collapse
Affiliation(s)
- Takashi Nakamura
- Department of Developmental and Regenerative Biology, Medical Research Institute, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan
| | | |
Collapse
|
32
|
Ooe H, Kon J, Oshima H, Mitaka T. Thyroid hormone is necessary for expression of constitutive androstane receptor in rat hepatocytes. Drug Metab Dispos 2009; 37:1963-9. [PMID: 19520777 DOI: 10.1124/dmd.108.022905] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Small hepatocytes are hepatocyte progenitor cells that possess the capability of maturation and cryopreservation. When cryopreserved rat small hepatocytes were cultured in serum-free medium, the protein expression and the inducibility of CYP1A1/2, CYP2E1, and CYP3A were maintained, but those of CYP2B1 were lost. In this study we investigated the cause of the loss of CYP2B1 expression in cryopreserved small hepatocytes by reverse transcription-polymerase chain reaction, immunoblotting, and chromatin immunoprecipitation assay. Expression of mRNA and protein of the nuclear receptor, constitutive androstane receptor (CAR), which regulates the expression of CYP2B1, was inhibited in the serum-free culture of cryopreserved small hepatocytes, whereas they were expressed in that of subcultured small hepatocytes. Serum application dramatically induced CAR expression in the culture of cryopreserved small hepatocytes. The addition of very low concentrations of thyroid hormones (THs; 3,5,3'-triiodothyronine, 5 x 10(-12) M; thyroxine, 5 x 10(-12)-5 x 10(-10) M) to the medium also induced the expression of CAR and CYP2B1. Moreover, CYP2B1 expression was induced by administration of phenobarbital. In rats with hypothyroidism induced by thyroidectomy and 6-propyl-2-thiouracil treatment, the expression of CAR and CYP2B1 was strongly repressed. Although THs do not directly regulate the expression of CAR, they may be important for rat hepatocytes to regulate CYP2B1 through CAR expression in the physiological condition.
Collapse
Affiliation(s)
- Hidekazu Ooe
- Department of Pathophysiology, Cancer Research Institute, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-Ku, Sapporo 060-8556, Japan
| | | | | | | |
Collapse
|
33
|
Wurm M, Lubei V, Caronna M, Hermann M, Buttiglieri S, Bodamer O, Muehl A, Tetta C, Margreiter R, Hengster P. Introduction of a Novel Prototype Bioartificial Liver Support System Utilizing Small Human Hepatocytes in Rotary Culture. Tissue Eng Part A 2009; 15:1063-73. [DOI: 10.1089/ten.tea.2008.0217] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Affiliation(s)
- Martin Wurm
- Department of General and Transplant Surgery, Medical University of Innsbruck, Innsbruck, Austria
| | - Verena Lubei
- Department of General and Transplant Surgery, Medical University of Innsbruck, Innsbruck, Austria
| | | | - Martin Hermann
- KMT Laboratory, Medical University of Innsbruck, Innsbruck, Austria
| | | | - Olaf Bodamer
- University Clinic for Paediatrics and Adolescent Medicine, Vienna Medical University, Vienna, Austria
| | - Adolf Muehl
- University Clinic for Paediatrics and Adolescent Medicine, Vienna Medical University, Vienna, Austria
| | - Ciro Tetta
- Research and Development, Fresenius Medical Care Deutschland GmbH, Bad Homburg, Germany
| | - Raimund Margreiter
- Department of General and Transplant Surgery, Medical University of Innsbruck, Innsbruck, Austria
| | - Paul Hengster
- Department of General and Transplant Surgery, Medical University of Innsbruck, Innsbruck, Austria
| |
Collapse
|
34
|
Sasaki K, Kon J, Mizuguchi T, Chen Q, Ooe H, Oshima H, Hirata K, Mitaka T. Proliferation of Hepatocyte Progenitor Cells Isolated from Adult Human Livers in Serum-Free Medium. Cell Transplant 2008; 17:1221-30. [DOI: 10.3727/096368908787236666] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Rat small hepatocytes (SHs) are committed progenitor cells that can differentiate into mature hepatocytes and can selectively proliferate in serum-free medium when they are cultured on hyaluronic acid (HA)-coated dishes. In this study we examined the separation of human SHs from adult human livers. We obtained liver tissues from the resected liver of 16 patients who underwent hepatic resections. Extracted liver specimens were clearly separate from the tumor regions with sufficient margins. Hepatic cells were isolated using the modified method of two-step collagenase perfusion. A low-speed centrifugation was performed and cells in the supernatant were finally cultured on HA-coated dishes in serum-free DMEM/F12 medium including nicotinamide, EGF, and HGF. Small-sized hepatocytes selectively proliferated to form colonies and many colonies continued growing for more than 3 weeks. The average number of cells in a colony was 38.6 ± 18.0, 79.0 ± 54.0, and 101.5 ± 115.7 at day 7, 14, and 21, respectively. About 0.04% of plated cells could form an SH colony. Immunocytochemistry showed that the cells forming a colony were positive for albumin, transferrin, keratin 8, and CD44. The results of RT-PCR showed that colony-forming cells expressed albumin, transferrin, α1-antitrypsin, fibrinogen, glutamine synthetase, many cytochrome P450s, and liver-enriched transcription factors (HNF3α, HNF4α, C/EBPα, and C/EBPβ). Furthermore, the cells expressed not only the genes of hepatic differentiated functions but also those of both hepatic stem cell marker (Thy1.1, EpCAM, AFP) and SH marker (CD44, D6.1A, BRI3). Albumin secretion into culture medium was also observed. Our results demonstrate the existence of hepatocyte progenitor cells in human adult livers, and the cells can grow in a serum-free medium on HA-coated dishes. Human SHs may be a useful source for cell transplantation as well as pharmaceutical and toxicological investigations.
Collapse
Affiliation(s)
- Kazunori Sasaki
- Department of Pathophysiology, Cancer Research Institute, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan
- Department of Surgery I, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan
| | - Junko Kon
- Department of Pathophysiology, Cancer Research Institute, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan
| | - Toru Mizuguchi
- Department of Surgery I, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan
| | - Qijie Chen
- Department of Pathophysiology, Cancer Research Institute, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan
| | - Hidekazu Ooe
- Department of Pathophysiology, Cancer Research Institute, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan
| | - Hideki Oshima
- Department of Surgery I, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan
| | - Koichi Hirata
- Department of Surgery I, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan
| | - Toshihiro Mitaka
- Department of Pathophysiology, Cancer Research Institute, Sapporo Medical University School of Medicine, Sapporo 060-8556, Japan
| |
Collapse
|
35
|
Ishii Y, Saito R, Marushima H, Ito R, Sakamoto T, Yanaga K. Hepatic reconstruction from fetal porcine liver cells using a radial flow bioreactor. World J Gastroenterol 2008; 14:2740-7. [PMID: 18461659 PMCID: PMC2709044 DOI: 10.3748/wjg.14.2740] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2007] [Revised: 02/25/2008] [Indexed: 02/06/2023] Open
Abstract
AIM To examine the efficacy of the radial flow bioreactor (RFB) as an extracorporeal bioartificial liver (BAL) and the reconstruction of liver organoids using embryonic pig liver cells. METHODS We reconstructed the liver organoids using embryonic porcine liver cells in the RFB. We also determined the gestational time window for the optimum growth of embryonic porcine liver cells. Five weeks of gestation was designated as embryonic day (E) 35 and 8 wk of gestation was designated as E56. These cells were cultured for one week before morphological and functional examinations. Moreover, the efficacy of pulsed administration of a high concentration hepatocyte growth factor (HGF) was examined. RESULTS Both cell growth and function were excellent after harvesting on E35. The pulsed administration of a high concentration of HGF promoted the differentiation and maturation of these fetal hepatic cells. Microscopic examination of organoids in the RFB revealed palisading and showed that bile duct-like structures were well developed, indicating that the organoids were mini livers. Transmission electron microscopy revealed microvilli on the luminal surfaces of bile duct-like structures and junctional complexes, which form the basis of the cytoskeleton of epithelial tissues. Furthermore, strong expression of connexin (Cx) 32, which is the main protein of hepatocyte gap junctions, was observed. With respect to liver function, ammonia detoxification and urea synthesis were shown to be performed effectively. CONCLUSION Our system can potentially be applied in the fields of BAL and transplantation medicine.
Collapse
|
36
|
Yagi K, Kojima M, Oyagi S, Ikeda E, Hirose M, Isoda K, Kawase M, Kondoh M, Ohgushi H. [Application of mesenchymal stem cells to liver regenerative medicine]. YAKUGAKU ZASSHI 2008; 128:3-9. [PMID: 18176050 DOI: 10.1248/yakushi.128.3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Stem cell-based therapy has received attention as a possible alternative to organ transplantation, owing to the ability of stem cells to repopulate and differentiate at the engrafted site. We transplanted bone marrow-derived mesenchymal stem cells (BMSCs) into liver-injured rats to test the therapeutic effect. Rat bone marrow cells were cultured in the presence of hepatocyte growth factor (HGF). RT-PCR and immunocytochemical analysis indicated that the BMSCs expressed the albumin mRNA and the production of protein after cultivation with HGF for 2 weeks. The BMSCs appeared to differentiate into hepatocyte-like cells in response to the culture with HGF. After labeling with a fluorescent marker, the BMSCs were transplanted into CCl(4)-injured rats by injection through the caudal vein. The liver was excised and blood samples were collected 4 weeks later. Engraftment of the transplanted BMSCs was seen with significant fluorescence in the injured liver. Transplantation of the BMSCs into liver-injured rats restored their serum albumin level and suppressed transaminase activity and liver fibrosis. Therefore, BMSCs were shown to have a therapeutic effect on liver injury. Recently, we have been trying to use mesenchymal stem cells isolated from dental papilla of discarded human wisdom teeth. Autologous transplantation of mesenchymal stem cells from bone marrow and dental papilla could be ethically and functionally promising for stem cell-based therapy.
Collapse
Affiliation(s)
- Kiyohito Yagi
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Utoh R, Tateno C, Yamasaki C, Hiraga N, Kataoka M, Shimada T, Chayama K, Yoshizato K. Susceptibility of chimeric mice with livers repopulated by serially subcultured human hepatocytes to hepatitis B virus. Hepatology 2008; 47:435-46. [PMID: 18098326 DOI: 10.1002/hep.22057] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
UNLABELLED We previously identified a small population of replicative hepatocytes in long-term cultures of human adult parenchymal hepatocytes (PHs) at a frequency of 0.01%-0.09%. These hepatocytes were able to grow continuously through serial subcultures as colony-forming parenchymal hepatocytes (CFPHs). In the present study, we generated gene expression profiles for cultured CFPHs and found that they expressed cytokeratin 19, CD90 (Thy-1), and CD44, but not mature hepatocyte markers such as tryptophan-2,3-dioxygenase (TO) and glucose-6-phosphatase (G6P), confirming that these cells are hepatic progenitor-like cells. The cultured CFPHs were resistant to infection with human hepatitis B virus (HBV). To examine the growth and differentiation capacity of the cells in vivo, serially subcultured CFPHs were transplanted into the progeny of a cross between albumin promoter/enhancer-driven urokinase plasminogen activator-transgenic mice and severe combined immunodeficient (SCID) mice. The cells were engrafted into the liver and were able to grow for at least 10 weeks, ultimately reaching a maximum occupancy rate of 27%. The CFPHs in the host liver expressed differentiation markers such as TO, G6P, and cytochrome P450 subtypes and could be infected with HBV. CFPH-chimeric mice with a relatively high replacement rate exhibited viremia and had high serum levels of hepatitis B surface antigen. CONCLUSION Serially subcultured human hepatic progenitor-like cells from postnatal livers successfully repopulated injured livers and exhibited several phenotypes of mature hepatocytes, including susceptibility to HBV. In vitro-expanded CFPHs can be used to characterize the differentiation state of human hepatic progenitor-like cells.
Collapse
Affiliation(s)
- Rie Utoh
- Yoshizato Project, Cooperative Link of Unique Science and Technology for Economy Revitalization (CLUSTER), Hiroshima Prefectural Institute of Industrial Science and Technology, Hiroshima, Japan
| | | | | | | | | | | | | | | |
Collapse
|
38
|
Wauthier E, Schmelzer E, Turner W, Zhang L, LeCluyse E, Ruiz J, Turner R, Furth M, Kubota H, Lozoya O, Barbier C, McClelland R, Yao H, Moss N, Bruce A, Ludlow J, Reid L. Hepatic Stem Cells and Hepatoblasts: Identification, Isolation, and Ex Vivo Maintenance. Methods Cell Biol 2008; 86:137-225. [DOI: 10.1016/s0091-679x(08)00008-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
39
|
Oshima H, Kon J, Ooe H, Hirata K, Mitaka T. Functional expression of organic anion transporters in hepatic organoids reconstructed by rat small hepatocytes. J Cell Biochem 2008; 104:68-81. [DOI: 10.1002/jcb.21601] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
40
|
SUDO R, TAKAHASHI N, MITAKA T, IKEDA M, TANISHITA K. The Effect of Micropatterned Pores on the Formation and Movement of Small Hepatocyte Colonies. ACTA ACUST UNITED AC 2008. [DOI: 10.1299/jbse.3.249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ryo SUDO
- Department of System Design Engineering, Keio University
| | | | - Toshihiro MITAKA
- Department of Pathophysiology, Cancer Research Institute, Sapporo Medical University School of Medicine
| | - Mariko IKEDA
- Department of System Design Engineering, Keio University
| | | |
Collapse
|
41
|
Yamamoto H, Togo S, Zheng YW, Kubota T, Taniguchi H, Shimada H. Adult rat hepatic bipotent progenitor cells remain dormant even after extensive hepatectomy. Wound Repair Regen 2007; 15:422-9. [PMID: 17537130 DOI: 10.1111/j.1524-475x.2007.00245.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
S It remains unknown whether the normal adult liver contains bipotent stem/progenitor cells, and if it does, then what are the circumstances under which they proliferate. The aim of this study was to clarify whether the normal adult liver contains hepatic stem/progenitor cells, and if it does, will they be activated by extensive hepatectomy? Adult rat liver cells were isolated and cultured at a low-density, and the colony-forming assay was performed to evaluate the cell proliferative capacity. Immunocytochemistry and reverse transcription-polymerase chain reaction were used to investigate the multilineage differentiation capability. The rate of colony formation by cells from the normal liver and those from the regenerating liver after partial hepatectomy (PH) were compared to determine whether progenitor cell proliferation might be activated by PH. Only a few epithelial colonies (0.043+/-0.009% of nonparenchymal cells) continued to proliferate for more than 1 month. Reverse transcription-polymerase chain reaction and immnocytochemistry showed that these progenitor colonies expressed both hepatocyte and cholangiocyte markers. The proportion of progenitor cells that formed bipotential colonies did not differ significantly between the cells obtained from the normal and PH livers. Adult normal liver contains bipotent hepatic progenitor cells, but they are scarcely activated even after extensive hepatectomy.
Collapse
Affiliation(s)
- Harumi Yamamoto
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | | | | | | | | | | |
Collapse
|
42
|
Yamada M, Kano K, Tsuda Y, Kobayashi J, Yamato M, Seki M, Okano T. Microfluidic devices for size-dependent separation of liver cells. Biomed Microdevices 2007; 9:637-45. [PMID: 17530413 DOI: 10.1007/s10544-007-9055-5] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Liver is composed of various kinds of cells, including hepatic parenchymal cells (hepatocytes) and nonparenchymal cells, and separation of these cells is essential for cellular therapies and pharmacological and metabolic studies. Here, we present microfluidic devices for purely hydrodynamic and size-dependent separation of liver cells, which utilize hydrodynamic filtration. By continuously introducing cell suspension into a microchannel with multiple side-branch channels, cells smaller than a specific size are removed from the mainstream, while large cells are focused onto a sidewall in the microchannel and then separated into two or three groups. Two types of PDMS-glass hybrid microdevices were fabricated, and rat liver cells were successfully separated. Also, cell size, morphology, viability and several cell functions were analyzed, and the separation performances of the microfluidic devices were compared to that of a conventional centrifugal technique. The results showed that the presented microfluidic devices are low-cost and suitable for clinical use, and capable of highly functional separation with relatively high-speed processing.
Collapse
Affiliation(s)
- Masumi Yamada
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo, 162-8666, Japan
| | | | | | | | | | | | | |
Collapse
|
43
|
Yamada S, Yamamoto Y, Nagasawa M, Hara A, Kodera T, Kojima I. In vitro transdifferentiation of mature hepatocytes into insulin-producing cells. Endocr J 2006; 53:789-95. [PMID: 16983179 DOI: 10.1507/endocrj.k06-116] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Adenovirus-mediated gene transfer of pancreatic duodenal homeobox transcription factor PDX-1, especially its super-active version (PDX-1/VP16), induces the expression of pancreatic hormones in murine liver and reverses streptozotocin-induced hyperglycemia. Histological analyses suggest that hepatocytes are the major source of insulin-producing cells by PDX-1 gene transfer, although the conversion of cultured hepatocytes into insulin-producing cells remains to be elucidated. The present study was conducted to address this issue. Hepatocytes were isolated from adult rats. Then, PDX-1 or PDX-1/VP16 gene was introduced by using adenovirus vector. Two days later, the expression of insulin was detected at mRNA and protein levels. Transfection of PDX-1/VP16 was more efficient in converting hepatocytes to insulin-producing cells. Immunoreactivity of albumin was downregulated in transdifferentiated cells and some of them almost completely lost albumin expression. During the course of transdifferentiation, upregulation of mRNA for CK19 and alpha-fetoprotein was observed. When cultured in collagen-1 gel sandwich configuration, hepatocytes maintained their mature phenotype and did not proliferate. In this condition, transfer of PDX-1/VP16 also induced the expression of insulin. These results clearly indicate that hepatocytes possess a potential to transdifferentiate into insulin-producing cells in vitro.
Collapse
Affiliation(s)
- Satoko Yamada
- Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | | | | | | | | | | |
Collapse
|
44
|
Liu H, Yan Y, Wang X, Cheng J, Lin F, Xiong Z, Wu R. Construct hepatic analog by cell-matrix controlled assembly technology. ACTA ACUST UNITED AC 2006. [DOI: 10.1007/s11434-006-2045-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
45
|
Ooe H, Kon J, Miyamoto S, Ozone Y, Ninomiya SI, Mitaka T. Cytochrome p450 expression of cultured rat small hepatocytes after long-term cryopreservation. Drug Metab Dispos 2006; 34:1667-71. [PMID: 16868070 DOI: 10.1124/dmd.105.008342] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Small hepatocytes (SHs) are hepatic progenitor cells that can be cryopreserved for a long time. After thawing, the cells can proliferate and, when treated with Matrigel, they can differentiate into mature hepatocytes (MHs). In this study, we investigated whether cryopreserved SHs could express cytochromes P450 (P450s), whether P450 expression was induced by appropriate inducers, and whether P450 activities were measurable. 3-Methylcholanthrene (3-MC), phenobarbital (PB), pregnenolone-16alpha-carbonitrile (PCN), and ethanol were used as inducers for CYP1A, 2B, 3A, and 2E, respectively. Immunoblot analysis indicated that cryopreserved SHs constitutively expressed CYP1A1/2, CYP2E1, and CYP3A2 as much as 26 days after plating. Significant expression of CYP1A1/2 and 3A2 in the cells treated with Matrigel was induced by 3-MC and PCN, respectively. Although Matrigel did not up-regulate the enzymatic activity of CYP1A, CYP3A and CYP2E activities increased. Induction of CYP1A and CYP3A activities by each inducer was observed in cryopreserved cells treated with Matrigel. Although the expression of CYP2B1 could be detected in subcultured SHs treated with PB, it was not detected in cryopreserved SHs. The activity of NADPH-cytochrome P450 reductase was measured in both subcultured and cryopreserved SHs, although the activities in both were approximately 30% of that of MHs. Profiles of (14)C-testosterone metabolites were examined in cultured MHs and in cryopreserved SHs by high-performance liquid chromatography. Similar peaks for testosterone metabolites in MHs and SHs were observed in the same elution time. These results indicate that, although induction of CYP3A and 2B in cryopreserved SHs is inferior to that in subcultured ones, SHs can maintain the expression and activities of P450s after long-term cryopreservation.
Collapse
Affiliation(s)
- Hidekazu Ooe
- Department of Pathophysiology, Cancer Research Institute, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-Ku, Sapporo 060-8556, Japan
| | | | | | | | | | | |
Collapse
|
46
|
|
47
|
Kon J, Ooe H, Oshima H, Kikkawa Y, Mitaka T. Expression of CD44 in rat hepatic progenitor cells. J Hepatol 2006; 45:90-8. [PMID: 16580085 DOI: 10.1016/j.jhep.2006.01.029] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2005] [Revised: 01/10/2006] [Accepted: 01/17/2006] [Indexed: 12/04/2022]
Abstract
BACKGROUND/AIMS Small hepatocytes (SHs) are hepatic progenitor cells, but the phenotypical difference between SHs and mature hepatocytes (MHs) has never been demonstrated. METHODS The profile of gene expression was examined to clarify the difference between SHs and MHs by using a DNA microarray. Genes that were specifically expressed in SHs were identified and RT-PCR analysis of them was performed. Immunocytochemistry for CD44 standard form (CD44s) and variant form 6 (CD44v6) was performed using cultured SHs and the d-galactosamine (GalN)-injured rat liver. From the GalN-treated liver, CD44s+ cells were obtained by sorting and RT-PCR analysis was performed. RESULTS Analysis using the DNA microarray and RT-PCR of them revealed restricted expression of CD44s and CD44v6 in SHs. In culture, CD44s appeared at day 3 and increased with the proliferation of SHs. CD44v6 expression was delayed compared to that of CD44s. With GalN-administration, CD44+ hepatocytes appeared around periportal areas at days 3 and 4 and then decreased. Sorted CD44s+ cells could form colonies and possessed hepatic markers. CONCLUSIONS CD44 is a specific marker of SHs. The expression of CD44 mRNA and protein is restricted to SHs, and is up-regulated at the time when SHs start to proliferate both in vitro and in vivo.
Collapse
Affiliation(s)
- Junko Kon
- Department of Pathophysiology, Cancer Research Institute, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-Ku, Sapporo 060-8556, Japan
| | | | | | | | | |
Collapse
|
48
|
Koenig S, Krause P, Drabent B, Schaeffner I, Christ B, Schwartz P, Unthan-Fechner K, Probst I. The expression of mesenchymal, neural and haematopoietic stem cell markers in adult hepatocytes proliferating in vitro. J Hepatol 2006; 44:1115-24. [PMID: 16458388 DOI: 10.1016/j.jhep.2005.09.016] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2005] [Revised: 09/23/2005] [Accepted: 09/29/2005] [Indexed: 12/04/2022]
Abstract
BACKGROUND/AIMS Cultured adult hepatocytes may be stimulated into clonal expansion. We raise the question whether adult hepatocytes proliferating in vitro recapitulate the early process of hepatic development. METHODS A non-enzymatic method was used to isolate hepatocytes free of contamination with non-parenchymal cells. Hepatocytes were stimulated into proliferation in the presence of mitogens and conditioned media from non-parenchymal cell and hepatocyte culture supernatants. Immunofluorescence methods and PCR analysis were used to demonstrate immunophenotypical characteristics and gene expression profiles similar to those of progenitor cells. RESULTS Rapid growth occurred during the first 7 days of culture. Cells continued to express hepatic markers (phosphoenolpyruvate carboxykinase, cytokeratin 18, transferrin and dipeptidylpeptidase IV), but the gap junction protein connexin 32 was down-regulated. In the early stage of proliferation, cells started to express biliary and extrahepatic progenitor markers (cytokeratin 19, CD49b, CD49f, nestin, vimentin, Thy1 and c-kit), followed by cytokeratin 7, connexin 43, and neural cell adhesion molecule. Co-expression of the epithelial liver progenitor marker alpha-foetoprotein with either nestin (neural marker) or Thy1 (mesenchymal marker) was also demonstrated. CONCLUSIONS Mature hepatocytes reveal their potential to regain a spectrum of progenitor markers from different germ layers, suggesting enormous plasticity and differentiation potential of adult liver cells.
Collapse
Affiliation(s)
- Sarah Koenig
- Department of General Surgery, Georg-August University Goettingen, Germany
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Asahina K, Shiokawa M, Ueki T, Yamasaki C, Aratani A, Tateno C, Yoshizato K. Multiplicative mononuclear small hepatocytes in adult rat liver: Their isolation as a homogeneous population and localization to periportal zone. Biochem Biophys Res Commun 2006; 342:1160-7. [PMID: 16516159 DOI: 10.1016/j.bbrc.2006.02.076] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2006] [Accepted: 02/14/2006] [Indexed: 01/13/2023]
Abstract
Adult rat liver contains a minor population of hepatocytes called small hepatocytes (SHs) that are smaller in size and show a higher replicative potential than conventional parenchymal hepatocytes (PHs). However, SHs have been hitherto characterized using a "SH-fraction" that was contaminated with PHs. In the present study, we isolated a PH-free SH-fraction from the adult rat liver using fluorescence-activated cell sorter combined with centrifugal elutriation and characterized the hepatocytes in the fraction. These hepatocytes were designated R3Hs in this study. R3Hs were mononuclear and of lower ploidy. They expressed at high levels genes of Cdc2, connexin 26, hydroxysteroid sulfotransferase, pancreatic secretory trypsin inhibitor, and prostaglandin E2 receptor EP3 subtype. We conclude that SHs dominate the periportal zone in the adult liver, because mRNA or proteins of these genes were exclusively expressed by periportal hepatocytes.
Collapse
Affiliation(s)
- Kinji Asahina
- Hiroshima Tissue Regeneration Project, Hiroshima Prefecture Collaboration of Regional Entities for the Advancement of Technological Excellence, Japan Science and Technology Corporation, Hiroshima Prefectural Institute of Industrial Science and Technology
| | | | | | | | | | | | | |
Collapse
|
50
|
Mizuguchi T, Oshima H, Imaizumi H, Kohara H, Kawamoto M, Nobuoka T, Kawasaki H, Harada K, Masuda Y, Kikkawa Y, Mitaka T, Asai Y, Hirata K. Hyperbaric oxygen stimulates cell proliferation and normalizes multidrug resistance protein-2 protein localization in primary rat hepatocytes. Wound Repair Regen 2005; 13:551-7. [PMID: 16283870 DOI: 10.1111/j.1524-475x.2005.00077.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Hyperbaric oxygen therapy (HBO) has been used for many clinical treatments, including primary liver non-function. However, the cellular mechanism by which HBO treatment ameliorates liver function is not understood. Therefore, the purpose of this study was to elucidate this cellular mechanism using primary cultured rat hepatocytes in in vitro studies. Hepatocytes were treated with HBO at 1 day after plating, and the morphological and functional characteristics of bile canaliculi formed in cultured hepatocytes were observed by time-lapse microscopy. Multidrug resistance protein-2 localization was observed by confocal laser microscopy. In cultured hepatocytes, the labeling index in the HBO group at 2 days after treatment was significantly higher than that in the control group. In addition, the proliferating cellular nuclear antigen level in the HBO group was significantly higher than that in the control group. The contraction of the bile canaliculi in the HBO group was slower than in the control group and the dilatation of bile canaliculi in the HBO group was much larger than in the control group. Multidrug resistance protein-2 in the HBO group was localized at the apical membrane. These results show that HBO stimulates hepatocytes to proliferate and HBO normalizes multidrug resistance protein-2 localization to the apical membrane, which could dilate bile canaliculi.
Collapse
Affiliation(s)
- Toru Mizuguchi
- Department of Surgery I, Cancer Research Institute, Sapporo Medical University School of Medicine, Sapporo, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|