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Spaan CN, de Boer RJ, Smit WL, van der Meer JH, van Roest M, Vermeulen JL, Koelink PJ, Becker MA, Go S, Silva J, Faller WJ, van den Brink GR, Muncan V, Heijmans J. Grp78 is required for intestinal Kras-dependent glycolysis proliferation and adenomagenesis. Life Sci Alliance 2023; 6:e202301912. [PMID: 37643866 PMCID: PMC10465924 DOI: 10.26508/lsa.202301912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 08/09/2023] [Accepted: 08/11/2023] [Indexed: 08/31/2023] Open
Abstract
In development of colorectal cancer, mutations in APC are often followed by mutations in oncogene KRAS The latter changes cellular metabolism and is associated with the Warburg phenomenon. Glucose-regulated protein 78 (Grp78) is an important regulator of the protein-folding machinery, involved in processing and localization of transmembrane proteins. We hypothesize that targeting Grp78 in Apc and Kras (AK)-mutant intestines interferes with the metabolic phenotype imposed by Kras mutations. In mice with intestinal epithelial mutations in Apc, Kras G12D and heterozygosity for Grp78 (AK-Grp78 HET ) adenoma number and size is decreased compared with AK-Grp78 WT mice. Organoids from AK-Grp78 WT mice exhibited a glycolysis metabolism which was completely rescued by Grp78 heterozygosity. Expression and correct localization of glucose transporter GLUT1 was diminished in AK-Grp78 HET cells. GLUT1 inhibition restrained the increased growth observed in AK-mutant organoids, whereas AK-Grp78 HET organoids were unaffected. We identify Grp78 as a critical factor in Kras-mutated adenomagenesis. This can be attributed to a critical role for Grp78 in GLUT1 expression and localization, targeting glycolysis and the Warburg effect.
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Affiliation(s)
- Claudia N Spaan
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Cancer Center Amsterdam, Cancer Biology and Immunology, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Ruben J de Boer
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Cancer Center Amsterdam, Cancer Biology and Immunology, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Wouter L Smit
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Cancer Center Amsterdam, Cancer Biology and Immunology, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Jonathan Hm van der Meer
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Manon van Roest
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Jacqueline Lm Vermeulen
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Pim J Koelink
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Marte Aj Becker
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Simei Go
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Joana Silva
- Department of Oncogenomics, Netherlands Cancer Institute, Amsterdam, Netherlands
| | - William J Faller
- Department of Oncogenomics, Netherlands Cancer Institute, Amsterdam, Netherlands
| | - Gijs R van den Brink
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Vanesa Muncan
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
| | - Jarom Heijmans
- https://ror.org/05grdyy37 Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Cancer Center Amsterdam, Cancer Biology and Immunology, Amsterdam, Netherlands
- https://ror.org/05grdyy37 Department of Internal Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, Netherlands
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Smit WL, de Boer RJ, Meijer BJ, Spaan CN, van Roest M, Koelink PJ, Koster J, Dekker E, Abbink TEM, van der Knaap MS, van den Brink GR, Muncan V, Heijmans J. Translation initiation factor eIF2Bε promotes Wnt-mediated clonogenicity and global translation in intestinal epithelial cells. Stem Cell Res 2021; 55:102499. [PMID: 34399164 DOI: 10.1016/j.scr.2021.102499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 08/02/2021] [Accepted: 08/05/2021] [Indexed: 11/30/2022] Open
Abstract
Modulation of global mRNA translation, which is essential for intestinal stem cell function, is controlled by Wnt signaling. Loss of tumor supressor APC in stem cells drives adenoma formation through hyperactivion of Wnt signaling and dysregulated translational control. It is unclear whether factors that coordinate global translation in the intestinal epithelium are needed for APC-driven malignant transformation. Here we identified nucleotide exchange factor eIF2Bε as a translation initiation factor involved in Wnt-mediated intestinal epithelial stemness. Using eIF2BεArg191His mice with a homozygous point mutation that leads to dysfunction in the enzymatic activity, we demonstrate that eIF2Bε is involved in small intestinal crypt formation, stemness marker expression, and secreted Paneth cell-derived granule formation. Wnt hyperactivation in ex vivo eIF2BεArg191His organoids, using a GSK3β inhibitor to mimic Apc driven transformation, shows that eIF2Bε is essential for Wnt-mediated clonogenicity and associated increase of the global translational capacity. Finally, we observe high eIF2Bε expression in human colonic adenoma tissues, exposing eIF2Bε as a potential target of CRC stem cells with aberrant Wnt signaling.
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Affiliation(s)
- W L Smit
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, the Netherlands
| | - R J de Boer
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, the Netherlands
| | - B J Meijer
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, the Netherlands
| | - C N Spaan
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, the Netherlands
| | - M van Roest
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, the Netherlands
| | - P J Koelink
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, the Netherlands
| | - J Koster
- Amsterdam UMC, University of Amsterdam, Department of Oncogenomics, Meibergdreef 9, 1105 AZ Amsterdam, the Netherlands
| | - E Dekker
- Department of Gastroenterology and Hepatology, Amsterdam University Medical Center, Location Academic Medical Center, Amsterdam, the Netherlands
| | - T E M Abbink
- Child Neurology, Emma Children's Hospital, Amsterdam University Medical Centers, Vrije Universiteit and Amsterdam Neuroscience, Amsterdam, the Netherlands; Department of Functional Genomics, Amsterdam Neuroscience, VU University, Amsterdam, the Netherlands
| | - M S van der Knaap
- Child Neurology, Emma Children's Hospital, Amsterdam University Medical Centers, Vrije Universiteit and Amsterdam Neuroscience, Amsterdam, the Netherlands
| | - G R van den Brink
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, the Netherlands; Roche Innovation Center Basel, F. Hoffmann-La Roche AG, Basel, Switzerland
| | - V Muncan
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, the Netherlands
| | - J Heijmans
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, the Netherlands; Amsterdam UMC, University of Amsterdam, Department of Internal Medicine, Meibergdreef 9, Amsterdam, the Netherlands.
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3
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Spaan CN, Smit WL, van Lidth de Jeude JF, Meijer BJ, Muncan V, van den Brink GR, Heijmans J. Expression of UPR effector proteins ATF6 and XBP1 reduce colorectal cancer cell proliferation and stemness by activating PERK signaling. Cell Death Dis 2019; 10:490. [PMID: 31227689 PMCID: PMC6588629 DOI: 10.1038/s41419-019-1729-4] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 05/18/2019] [Accepted: 05/20/2019] [Indexed: 12/15/2022]
Abstract
The unfolded protein response (UPR) acts through its downstream branches, PERK-eIF2α signaling, IRE1α-XBP1 signaling and ATF6 signaling. In the intestine, activation of the UPR through the kinase PERK results in differentiation of intestinal epithelial stem cells and colon cancer stem cells, whereas deletion of XBP1 results in increased stemness and adenomagenesis. How downstream activation of XBP1 and ATF6 influences intestinal stemness and proliferation remains largely unknown. We generated colorectal cancer cells (LS174T) that harbor doxycycline inducible expression of the active forms of either XBP1(s) or ATF61-373. Activation of either XBP1 or ATF6 resulted in reduced cellular proliferation and reduced expression of markers of intestinal epithelial stemness. Moreover, XBP1 and ATF6 activation reduced global protein synthesis and lowered the threshold for UPR activation. XBP1-mediated loss of stemness and proliferation resulted from crossactivation of PERK-eIF2α signaling and could be rescued by constitutive expression of eIF2α phosphatase GADD34. We thus find that enforced activation of XBP1 and ATF6 results in reduction of stemness and proliferation. We expose a novel interaction between XBP1 and PERK-eIF2α signaling.
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Affiliation(s)
- Claudia N Spaan
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, The Netherlands
| | - Wouter L Smit
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, The Netherlands
| | - Jooske F van Lidth de Jeude
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, The Netherlands
| | - Bartolomeus J Meijer
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, The Netherlands
| | - Vanesa Muncan
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, The Netherlands
| | - Gijs R van den Brink
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, The Netherlands.,Roche Innovation Center Basel, F. Hoffmann-La Roche AG, Basel, Switzerland
| | - Jarom Heijmans
- Amsterdam UMC, University of Amsterdam, Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Meibergdreef 71, Amsterdam, The Netherlands. .,Amsterdam UMC, University of Amsterdam, Department of Internal Medicine and Hematology, Meibergdreef 9, Amsterdam, The Netherlands.
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van Lidth de Jeude JF, Spaan CN, Meijer BJ, Smit WL, Soeratram TTD, Wielenga MCB, Westendorp BF, Lee AS, Meisner S, Vermeulen JLM, Wildenberg ME, van den Brink GR, Muncan V, Heijmans J. Heterozygosity of Chaperone Grp78 Reduces Intestinal Stem Cell Regeneration Potential and Protects against Adenoma Formation. Cancer Res 2018; 78:6098-6106. [PMID: 30232220 DOI: 10.1158/0008-5472.can-17-3600] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 05/17/2018] [Accepted: 09/05/2018] [Indexed: 02/05/2023]
Abstract
Deletion of endoplasmic reticulum resident chaperone Grp78 results in activation of the unfolded protein response and causes rapid depletion of the entire intestinal epithelium. Whether modest reduction of Grp78 may affect stem cell fate without compromising intestinal integrity remains unknown. Here, we employ a model of epithelial-specific, heterozygous Grp78 deletion by use of VillinCreERT2-Rosa26ZsGreen/LacZ-Grp78+/fl mice and organoids. We examine models of irradiation and tumorigenesis, both in vitro and in vivo Although we observed no phenotypic changes in Grp78 heterozygous mice, Grp78 heterozygous organoid growth was markedly reduced. Irradiation of Grp78 heterozygous mice resulted in less frequent regeneration of crypts compared with nonrecombined (wild-type) mice, exposing reduced capacity for self-renewal upon genotoxic insult. We crossed mice to Apc-mutant animals for adenoma studies and found that adenomagenesis in Apc heterozygous-Grp78 heterozygous mice was reduced compared with Apc heterozygous controls (1.43 vs. 3.33; P < 0.01). In conclusion, epithelium-specific Grp78 heterozygosity compromises epithelial fitness under conditions requiring expansive growth such as adenomagenesis or regeneration after γ-irradiation. These results suggest that Grp78 may be a therapeutic target in prevention of intestinal neoplasms without affecting normal tissue.Significance: Heterozygous disruption of chaperone protein Grp78 reduces tissue regeneration and expansive growth and protects from tumor formation without affecting intestinal homeostasis. Cancer Res; 78(21); 6098-106. ©2018 AACR.
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Affiliation(s)
- Jooske F van Lidth de Jeude
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Claudia N Spaan
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Bartolomeus J Meijer
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Wouter L Smit
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Tanya T D Soeratram
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Mattheus C B Wielenga
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - B Florien Westendorp
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Amy S Lee
- Department of Biochemistry and Molecular Medicine, USC/Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, Los Angeles, California
| | - Sander Meisner
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Jacqueline L M Vermeulen
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Manon E Wildenberg
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Gijs R van den Brink
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Vanesa Muncan
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands
| | - Jarom Heijmans
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, University of Amsterdam, Amsterdam, the Netherlands. .,Department of Internal Medicine, University of Amsterdam, Amsterdam, the Netherlands
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5
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van Lidth de Jeude JF, Meijer BJ, Wielenga MCB, Spaan CN, Baan B, Rosekrans SL, Meisner S, Shen YH, Lee AS, Paton JC, Paton AW, Muncan V, van den Brink GR, Heijmans J. Induction of endoplasmic reticulum stress by deletion of Grp78 depletes Apc mutant intestinal epithelial stem cells. Oncogene 2016; 36:3397-3405. [PMID: 27819675 DOI: 10.1038/onc.2016.326] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 06/29/2016] [Accepted: 07/26/2016] [Indexed: 12/13/2022]
Abstract
Intestinal epithelial stem cells are highly sensitive to differentiation induced by endoplasmic reticulum (ER) stress. Colorectal cancer develops from mutated intestinal epithelial stem cells. The most frequent initiating mutation occurs in Apc, which results in hyperactivated Wnt signalling. This causes hyperproliferation and reduced sensitivity to chemotherapy, but whether these mutated stem cells are sensitive to ER stress induced differentiation remains unknown. Here we examined this by generating mice in which both Apc and ER stress repressor chaperone Grp78 can be conditionally deleted from the intestinal epithelium. For molecular studies, we used intestinal organoids derived from these mice. Homozygous loss of Apc alone resulted in crypt elongation, activation of the Wnt signature and accumulation of intestinal epithelial stem cells, as expected. This phenotype was however completely rescued on activation of ER stress by additional deletion of Grp78. In these Apc-Grp78 double mutant animals, stem cells were rapidly lost and repopulation occurred by non-mutant cells that had escaped recombination, suggesting that Apc-Grp78 double mutant stem cells had lost self-renewal capacity. Although in Apc-Grp78 double mutant mice the Wnt signature was lost, these intestines exhibited ubiquitous epithelial presence of nuclear β-catenin. This suggests that ER stress interferes with Wnt signalling downstream of nuclear β-catenin. In conclusion, our findings indicate that ER stress signalling results in loss of Apc mutated intestinal epithelial stem cells by interference with the Wnt signature. In contrast to many known inhibitors of Wnt signalling, ER stress acts downstream of β-catenin. Therefore, ER stress poses a promising target in colorectal cancers, which develop as a result of Wnt activating mutations.
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Affiliation(s)
- J F van Lidth de Jeude
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - B J Meijer
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - M C B Wielenga
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - C N Spaan
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - B Baan
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - S L Rosekrans
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - S Meisner
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - Y H Shen
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - A S Lee
- USC/Norris Comprehensive Cancer Center, Department of Biochemistry and Molecular Biology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - J C Paton
- Research Centre for Infectious Diseases, Department of Molecular and Cellular Biology, School of Biological Sciences, University of Adelaide, South Australia, Australia
| | - A W Paton
- Research Centre for Infectious Diseases, Department of Molecular and Cellular Biology, School of Biological Sciences, University of Adelaide, South Australia, Australia
| | - V Muncan
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - G R van den Brink
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
| | - J Heijmans
- Academic Medical Center, Tygat Institute for Liver and Intestinal Research and Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands.,Academic Medical Center, Department of Internal Medicine, Amsterdam, The Netherlands
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