101
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Qin W, Zheng Y, Qian BZ, Zhao M. Prostate Cancer Stem Cells and Nanotechnology: A Focus on Wnt Signaling. Front Pharmacol 2017; 8:153. [PMID: 28400729 PMCID: PMC5368180 DOI: 10.3389/fphar.2017.00153] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 03/09/2017] [Indexed: 12/19/2022] Open
Abstract
Prostate cancer is the most common cancer among men worldwide. However, current treatments for prostate cancer patients in advanced stage often fail because of relapse. Prostate cancer stem cells (PCSCs) are resistant to most standard therapies, and are considered to be a major mechanism of cancer metastasis and recurrence. In this review, we summarized current understanding of PCSCs and their self-renewal signaling pathways with a specific focus on Wnt signaling. Although multiple Wnt inhibitors have been developed to target PCSCs, their application is still limited by inefficient delivery and toxicity in vivo. Recently, nanotechnology has opened a new avenue for cancer drug delivery, which significantly increases specificity and reduces toxicity. These nanotechnology-based drug delivery methods showed great potential in targeting PCSCs. Here, we summarized current advancement of nanotechnology-based therapeutic strategies for targeting PCSCs and highlighted the challenges and perspectives in designing future therapies to eliminate PCSCs.
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Affiliation(s)
- Wei Qin
- The Third Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen UniversityGuangzhou, China; Key Laboratory for Stem Cells and Tissue Engineering, Ministry of Education, Sun Yat-sen UniversityGuangzhou, China
| | - Yongjiang Zheng
- The Third Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen University Guangzhou, China
| | - Bin-Zhi Qian
- Edinburgh Cancer Research UK Centre and MRC University of Edinburgh Centre for Reproductive Health, University of Edinburgh Edinburgh, UK
| | - Meng Zhao
- The Third Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen UniversityGuangzhou, China; Key Laboratory for Stem Cells and Tissue Engineering, Ministry of Education, Sun Yat-sen UniversityGuangzhou, China; Department of Pathophysiology, Zhongshan School of Medicine, Sun Yat-sen UniversityGuangzhou, China
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102
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Amitosis of Polyploid Cells Regenerates Functional Stem Cells in the Drosophila Intestine. Cell Stem Cell 2017; 20:609-620.e6. [PMID: 28343984 DOI: 10.1016/j.stem.2017.02.012] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 12/06/2016] [Accepted: 02/16/2017] [Indexed: 01/06/2023]
Abstract
Organ fitness depends on appropriate maintenance of stem cell populations, and aberrations in functional stem cell numbers are associated with malignancies and aging. Symmetrical division is the best characterized mechanism of stem cell replacement, but other mechanisms could also be deployed, particularly in situations of high stress. Here, we show that after severe depletion, intestinal stem cells (ISCs) in the Drosophila midgut are replaced by spindle-independent ploidy reduction of cells in the enterocyte lineage through a process known as amitosis. Amitosis is also induced by the functional loss of ISCs coupled with tissue demand and in aging flies, underscoring the generality of this mechanism. However, we also found that random homologous chromosome segregation during ploidy reduction can expose deleterious mutations through loss of heterozygosity. Together, our results highlight amitosis as an unappreciated mechanism for restoring stem cell homeostasis, but one with some associated risk in animals carrying mutations.
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103
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Lu R, Voigt RM, Zhang Y, Kato I, Xia Y, Forsyth CB, Keshavarzian A, Sun J. Alcohol Injury Damages Intestinal Stem Cells. Alcohol Clin Exp Res 2017; 41:727-734. [PMID: 28195397 DOI: 10.1111/acer.13351] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 02/07/2017] [Indexed: 12/11/2022]
Abstract
BACKGROUND Alcohol consumption is associated with intestinal injury including intestinal leakiness and the risk of developing progressive gastrointestinal cancer. Alcoholics have disruption of intestinal barrier dysfunction that persists weeks after stopping alcohol intake, and this occurs in spite of the fact that intestinal epithelial cells turn over every 3 to 5 days. The renewal and functional regulation of the intestinal epithelium largely relies on intestinal stem cells (ISCs). Chronic inflammation and tissue damage in the intestine can injure stem cells including accumulation of mutations that may result in ISC dysfunction and transformation. ISCs are a key element in intestinal function and pathology; however, very little is known about the effects of alcohol on ISCs. We hypothesize that dysregulation of ISCs is one mechanism by which alcohol induces long-lasting intestinal damage. METHODS In Vivo: Small intestinal samples from alcohol- and control-fed mice were assessed for ISC markers (Lgr5 and Bmi1) and the changes of the β-catenin signaling using immunofluorescent microscopy, Western blotting, and RT-PCR. Ex Vivo: Organoids were generated from small intestine tissue and subsequently exposed to alcohol and analyzed for ISC markers, β-catenin signaling. RESULTS Chronic alcohol consumption significantly decreased the expression of stem cell markers, Bmi1 in the small intestine of the alcohol-fed mice and also resulted in dysregulation of the β-catenin signaling-an essential regulator of its target gene Lgr5 and ISC function. Exposure of small intestine-derived organoids to 0.2% alcohol significantly reduced the growth of the organoids, including budding, and total surface area of the organoid cultures. Alcohol also significantly decreased the expression of Lgr5, p-β-catenin (ser552), and Bmi1 in the organoid model. CONCLUSIONS Both chronic alcohol feeding and acute exposure of alcohol resulted in ISC dysregulation which might be one mechanism for alcohol-induced long-lasting intestinal damage.
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Affiliation(s)
- Rong Lu
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois
| | - Robin M Voigt
- Division of Digestive Diseases and Nutrition, Department of Medicine, Rush University Medical Center, Chicago, Illinois
| | - Yongguo Zhang
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois
| | - Ikuko Kato
- Departments of Oncology and Pathology, Wayne State University School of Medicine, Detroit, Michigan
| | - Yinglin Xia
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois
| | - Christopher B Forsyth
- Division of Digestive Diseases and Nutrition, Department of Medicine, Rush University Medical Center, Chicago, Illinois
| | - Ali Keshavarzian
- Division of Digestive Diseases and Nutrition, Department of Medicine, Rush University Medical Center, Chicago, Illinois
| | - Jun Sun
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois
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104
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El-Salhy M, Umezawa K, Hatlebakk JG, Gilja OH. Abnormal differentiation of stem cells into enteroendocrine cells in rats with DSS-induced colitis. Mol Med Rep 2017; 15:2106-2112. [PMID: 28259987 PMCID: PMC5364957 DOI: 10.3892/mmr.2017.6266] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Accepted: 12/05/2016] [Indexed: 12/13/2022] Open
Abstract
The present study aimed to determine whether there is an association between abnormalities in enteroendocrine cells in dextran sulfate sodium (DSS)-induced colitis and the clonogenic and/or proliferative activities of stem cells. A total of 48 male Wistar rats were divided into four groups. Animals in the control group were provided with normal drinking water, whereas DSS colitis was induced in the remaining three groups. The rats with DSS-induced colitis were randomized into the following three groups: i) DSS group, which received 0.5 ml 0.5% carboxymethyl cellulose (CMC; vehicle); ii) DSS-G group, which was treated with 3-[(dodecylthiocarbonyl)-methyl]-glutarimide at 20 mg/kg body weight in 0.5% CMC; and iii) DSS-Q group, which was treated with dehydroxymethylepoxyquinomicin at 15 mg/kg body weight in 0.5% CMC. Treatments were administered intraperitoneally twice daily for 5 days in all groups. Subsequently, tissue samples from the colon were stained with hematoxylin-eosin, or immunostained for chromogranin A (CgA), Musashi 1 (Msi1), Math-1, neurogenin 3 (Neurog3) and neurogenic differentiation D1 (NeuroD1). The densities of CgA, Msi1-, Math-1-, Neurog3- and NeuroD1-immunoreactive cells were determined. DTCM-G, and DHMEQ ameliorated the inflammation in DSS-induced colitis. The density of CgA-, Neurog3- and NeuroD1-immunoreactive cells was significantly higher in the DSS group compared with in the control group, and the density of CgA cells was correlated with the densities of Neurog3- and NeuroD1-immunoreactive cells. There were no significant differences in the densities of Msi1- and Math-1-immunoreactive cells among the four experimental groups. The elevated densities of enteroendocrine cells detected in DSS-induced colitis may be due to the increased differentiation of early enteroendocrine progenitors during secretory lineage. It is probable that the DSS-induced inflammatory processes trigger certain signaling pathways, which control differentiation of the stem-cell secretory lineage into mature enteroendocrine cells.
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Affiliation(s)
- Magdy El-Salhy
- Division of Gastroenterology, Department of Medicine, Stord Hospital, 5409 Stord, Norway
| | - Kazuo Umezawa
- Department of Molecular Target Medicine, Aichi Medical University, School of Medicine, Nagakute, Aichi 480‑1195, Japan
| | - Jan Gunnar Hatlebakk
- Division of Gastroenterology, Department of Clinical Medicine, University of Bergen, 5007 Bergen, Norway
| | - Odd Helge Gilja
- Division of Gastroenterology, Department of Clinical Medicine, University of Bergen, 5007 Bergen, Norway
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105
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Morrow KA, Das S, Meng E, Menezes ME, Bailey SK, Metge BJ, Buchsbaum DJ, Samant RS, Shevde LA. Loss of tumor suppressor Merlin results in aberrant activation of Wnt/β-catenin signaling in cancer. Oncotarget 2017; 7:17991-8005. [PMID: 26908451 PMCID: PMC4951266 DOI: 10.18632/oncotarget.7494] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 02/11/2016] [Indexed: 11/25/2022] Open
Abstract
The expression of the tumor suppressor Merlin is compromised in nervous system malignancies due to genomic aberrations. We demonstrated for the first time, that in breast cancer, Merlin protein expression is lost due to proteasome-mediated elimination. Immunohistochemical analysis of tumor tissues from patients with metastatic breast cancer revealed characteristically reduced Merlin expression. Importantly, we identified a functional role for Merlin in impeding breast tumor xenograft growth and reducing invasive characteristics. We sought to determine a possible mechanism by which Merlin accomplishes this reduction in malignant activity. We observed that breast and pancreatic cancer cells with loss of Merlin show an aberrant increase in the activity of β-catenin concomitant with nuclear localization of β-catenin. We discovered that Merlin physically interacts with β-catenin, alters the sub-cellular localization of β-catenin, and significantly reduces the protein levels of β-catenin by targeting it for degradation through the upregulation of Axin1. Consequently, restoration of Merlin inhibited β-catenin-mediated transcriptional activity in breast and pancreatic cancer cells. We also present evidence that loss of Merlin sensitizes tumor cells to inhibition by compounds that target β-catenin-mediated activity. Thus, this study provides compelling evidence that Merlin reduces the malignant activity of pancreatic and breast cancer, in part by suppressing the Wnt/β-catenin pathway. Given the potent role of Wnt/β-catenin signaling in breast and pancreatic cancer and the flurry of activity to test β-catenin inhibitors in the clinic, our findings are opportune and provide evidence for Merlin in restraining aberrant activation of Wnt/β-catenin signaling.
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Affiliation(s)
- K Adam Morrow
- Mitchell Cancer Institute, University of South Alabama, Mobile, AL, USA
| | - Shamik Das
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Erhong Meng
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA
| | | | - Sarah K Bailey
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Brandon J Metge
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Donald J Buchsbaum
- Department of Radiation Oncology, University of Alabama at Birmingham, Birmingham, AL, USA.,Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Rajeev S Samant
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA.,Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Lalita A Shevde
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA.,Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL, USA
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106
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El-Salhy M, Hausken T, Gilja OH, Hatlebakk JG. The possible role of gastrointestinal endocrine cells in the pathophysiology of irritable bowel syndrome. Expert Rev Gastroenterol Hepatol 2017; 11:139-148. [PMID: 27927062 DOI: 10.1080/17474124.2017.1269601] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The etiology of irritable bowel syndrome (IBS) is unknown, but several factors appear to play a role in its pathophysiology, including abnormalities of the gastrointestinal endocrine cells. The present review illuminates the possible role of gastrointestinal hormones in the pathophysiology of IBS and the possibility of utilizing the current knowledge in treating the disease. Areas covered: Research into the intestinal endocrine cells and their possible role in the pathophysiology of IBS is discussed. Furthermore, the mechanisms underlying the abnormalities in the gastrointestinal endocrine cells in IBS patients are revealed. Expert commentary: The abnormalities observed in the gastrointestinal endocrine cells in IBS patients explains their visceral hypersensitivity, gastrointestinal dysmotility, and abnormal intestinal secretion, as well as the interchangeability of symptoms over time. Clarifying the role of the intestinal stem cells in the pathophysiology of IBS may lead to new treatment methods for IBS.
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Affiliation(s)
- Magdy El-Salhy
- a Division of Gastroenterology, Department of Medicine , Stord Hospital , Stord , Norway.,b Division of Gastroenterology, Department of Clinical Medicine , University of Bergen , Bergen , Norway.,c National Centre for Functional Gastrointestinal Disorders, Department of Medicine , Haukeland University Hospital , Bergen , Norway
| | - Trygve Hausken
- b Division of Gastroenterology, Department of Clinical Medicine , University of Bergen , Bergen , Norway.,c National Centre for Functional Gastrointestinal Disorders, Department of Medicine , Haukeland University Hospital , Bergen , Norway
| | - Odd Helge Gilja
- b Division of Gastroenterology, Department of Clinical Medicine , University of Bergen , Bergen , Norway.,c National Centre for Functional Gastrointestinal Disorders, Department of Medicine , Haukeland University Hospital , Bergen , Norway.,d National Centre for Ultrasound in Gastroenterology, Department of Medicine , Haukeland University Hospital , Bergen , Norway
| | - Jan Gunnar Hatlebakk
- b Division of Gastroenterology, Department of Clinical Medicine , University of Bergen , Bergen , Norway.,c National Centre for Functional Gastrointestinal Disorders, Department of Medicine , Haukeland University Hospital , Bergen , Norway
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107
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Poloz Y, Dowling RJO, Stambolic V. Fundamental Pathways in Breast Cancer 1: Signaling from the Membrane. Breast Cancer 2017. [DOI: 10.1007/978-3-319-48848-6_1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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108
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Hu J, Feng M, Liu ZL, Liu Y, Huang ZL, Li H, Feng WL. Potential role of Wnt/β-catenin signaling in blastic transformation of chronic myeloid leukemia: cross talk between β-catenin and BCR-ABL. Tumour Biol 2016; 37:10.1007/s13277-016-5413-3. [PMID: 27817074 DOI: 10.1007/s13277-016-5413-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 09/13/2016] [Indexed: 12/25/2022] Open
Abstract
Chronic myeloid leukemia (CML) results from malignant transformation of hematopoietic stem cells induced by the BCR-ABL oncogene. Transformation from chronic to blastic phase is the lethal step in CML. Leukemic stem cells (LSCs) are the basic reason for blastic transformation. It has been shown that Wnt/β-catenin signaling contributes to the self-renewal capacity and proliferation of LSCs in CML. However, the role of Wnt/β-catenin signaling in blastic transformation of CML is still obscure. Here, we explored the relationship between BCR-ABL and β-catenin signaling in vitro and in vivo. We found that BCR-ABL stimulated β-catenin via activation of PI3K/AKT signaling in blastic phase CML cells. Inhibition of the kinase activity of BCR-ABL, PI3K, or AKT decreased the level of β-catenin in both K562 cells and a CML mouse model and suppressed the transcription of downstream target genes (c-myc and cyclin D1). In addition, inhibition of the BCR-ABL/PI3K/AKT pathway delayed the disease progression in the CML mouse model. To further explore the role of β-catenin in the self-renewal and survival of CML LSCs, we established a secondary transplantation CML mouse model. Our data revealed that inhibition of the BCR-ABL/PI3K/AKT pathway reduced the tumor-initiating ability of K562 cells, decreased leukemia cell infiltration into peripheral blood and bone marrow, and prolonged the survival of mice. In conclusion, our data indicate a close relationship between β-catenin and BCR-ABL/PI3K/AKT in blastic phase CML. β-Catenin inhibition may be of therapeutic value by targeting LSCs in combination with a tyrosine kinase inhibitor, which may delay blastic transformation of CML.
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Affiliation(s)
- Jing Hu
- Department of Clinical Hematology, Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - Min Feng
- Institute of Neuroscience, Key Laboratory of Neurobiology, Chongqing Medical University, Chongqing, China
| | - Zhang-Ling Liu
- Department of Clinical Hematology, Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - Yi Liu
- Department of Clinical Hematology, Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - Zheng-Lan Huang
- Department of Clinical Hematology, Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - Hui Li
- Department of Clinical Hematology, Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - Wen-Li Feng
- Department of Clinical Hematology, Key Laboratory of Laboratory Medical Diagnostics Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China.
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109
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Liu J, Wang B, Huang P, Wang H, Xu K, Wang X, Xu L, Guo Z. Microcystin-LR promotes cell proliferation in the mice liver by activating Akt and p38/ERK/JNK cascades. CHEMOSPHERE 2016; 163:14-21. [PMID: 27517128 DOI: 10.1016/j.chemosphere.2016.08.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Revised: 07/22/2016] [Accepted: 08/01/2016] [Indexed: 06/06/2023]
Abstract
Microcystin-LR (MC-LR), a heptapeptide produced by blue-green algae, is shown to induce cytotoxicity by inhibiting protein phosphatase 2A (PP2A) activity. Our previous study revealed that MC-LR promoted cell proliferation in vitro by activating the Akt/mTORC1/S6K1 pathway. This study aims to further investigate the effects of MC-LR on cell proliferation and the correlated mechanisms in vivo. Mice were injected intraperitoneally with 20-80 μg/kg/d MC-LR from 2 h (hours) to 4 d (days). The results showed that the associations of MC-LR with PP2A/C (PP2A C subunit) were concentration-dependent but not time-dependent in the liver, whereas the total PP2A activity was inhibited in both concentration and time dependent manners. The PP2A regulator α4 was found to release its associated PP2A/C as MC-LR bound to PP2A/C. Importantly, 80 μg/kg MC-LR promoted liver cell proliferation beginning at 1 d post exposure, and hyperproliferation also occurred in the 40 μg/kg group at 4 d after exposure. Meanwhile, the Akt/mTORC1/S6K1 and Akt/β-catenin signaling pathways were activated as early as at 2 h post exposure. Furthermore, MC-LR also activated ERK/p38/JNK MAPKs as early as at 2 h post exposure, which was supported by the hyperphosphorylation of their substrates, ATF-2, c-Jun and c-Myc. Interestingly, the total c-Jun and c-Myc levels also increased after MC-LR exposure. These findings indicate that MC-LR can also promote cell proliferation in vivo, and the activation of Akt and MAPK signaling pathways due to PP2A inhibition is proposed to participate in this process.
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Affiliation(s)
- Jinghui Liu
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Beilei Wang
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Pu Huang
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Hanying Wang
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Kailun Xu
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China
| | - Xiaofeng Wang
- Zhejiang Center for Disease Control and Prevention, Hangzhou 310051, China
| | - Lihong Xu
- Department of Biochemistry, School of Medicine, Zhejiang University, Hangzhou 310058, China.
| | - Zonglou Guo
- Department of Biosystem Engineering, College of Biosystem Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
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110
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El-Salhy M, Mazzawi T, Umezawa K, Gilja OH. Enteroendocrine cells, stem cells and differentiation progenitors in rats with TNBS-induced colitis. Int J Mol Med 2016; 38:1743-1751. [PMID: 27779708 PMCID: PMC5117771 DOI: 10.3892/ijmm.2016.2787] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Accepted: 09/14/2016] [Indexed: 12/15/2022] Open
Abstract
Patients with inflammatory bowel disease (IBD), as well as animal models of human IBD have abnormal enteroendocrine cells. The present study aimed to identify the possible mechanisms underlying these abnormalities. For this purpose, 40 male Wistar rats were divided into 4 groups as follows: the control group, the group with trinitrobenzene sulfonic acid (TNBS)-induced colitis with no treatment (TNBS group), the group with TNBS-induced colitis treated with 3-[(dodecylthiocarbonyl)-methyl]-glutarimide (DTCM-G; an activator protein-1 inhibitor) (DTCM-G group), and the group with TNBS-induced colitis treated with dehydroxymethylepoxyquinomicin (DHMEQ; a nuclear factor-κB inhibitor) treatment (DHMEQ group). Three days following the administration of TNBS, the rats were treated as follows: those in the control and TNBS groups received 0.5 ml of the vehicle [0.5% carboxymethyl cellulose (CMC)], those in the DTCM-G group received DTCM-G at 20 mg/kg body weight in 0.5% CMC, and those in the DHMEQ group received DHMEQ at 15 mg/kg body weight in 0.5% CMC. All injections were administered intraperitoneally twice daily for 5 days. The rats were then sacrificed, and tissue samples were taken from the colon. The tissue sections were stained with hemotoxylin-eosin and immunostained for chromogranin A (CgA), serotonin, peptide YY (PYY), oxyntomodulin, pancreatic polypeptide (PP), somatostatin, Musashi1 (Msi1), Math1, Neurogenin3 (Neurog3) and NeuroD1. The staining was quantified using image analysis software. The densities of CgA-, PYY-, PP-, Msi1-, Neurog3- and NeuroD1-positive cells were significantly lower in the TNBS group than those in the control group, while those of serotonin-, oxyntomodulin- and somatostatin-positive cells were significantly higher in the TNBS group than those in the control group. Treatment with either DTCM-G or DHMEQ restored the densities of enteroendocrine cells, stem cells and their progenitors to normal levels. It was thus concluded that the abnormalities in enteroendocrine cells and stem cells and their differentiation progenitors may be caused by certain signaling substances produced under inflammatory processes, resulting in changes in hormone expression in enteroendocrine cells. These substances may also interfere with the colonogenic activity and the differentiation of the stem-cell secretory lineage into mature enteroendocrine cells.
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Affiliation(s)
- Magdy El-Salhy
- Division of Gastroenterology, Department of Medicine, Stord Helse-Fonna Hospital, 5416 Stord, Norway
| | - Tarek Mazzawi
- Division of Gastroenterology, Institute of Clinical Medicine, University of Bergen, 5020 Bergen, Norway
| | - Kazuo Umezawa
- Department of Molecular Target Medicine, School of Aichi Medical University, School of Medicine, Nagakute, 480-1195 Aichi, Japan
| | - Odd Helge Gilja
- Division of Gastroenterology, Institute of Clinical Medicine, University of Bergen, 5020 Bergen, Norway
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111
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Wang Z, Monteiro CD, Jagodnik KM, Fernandez NF, Gundersen GW, Rouillard AD, Jenkins SL, Feldmann AS, Hu KS, McDermott MG, Duan Q, Clark NR, Jones MR, Kou Y, Goff T, Woodland H, Amaral FMR, Szeto GL, Fuchs O, Schüssler-Fiorenza Rose SM, Sharma S, Schwartz U, Bausela XB, Szymkiewicz M, Maroulis V, Salykin A, Barra CM, Kruth CD, Bongio NJ, Mathur V, Todoric RD, Rubin UE, Malatras A, Fulp CT, Galindo JA, Motiejunaite R, Jüschke C, Dishuck PC, Lahl K, Jafari M, Aibar S, Zaravinos A, Steenhuizen LH, Allison LR, Gamallo P, de Andres Segura F, Dae Devlin T, Pérez-García V, Ma'ayan A. Extraction and analysis of signatures from the Gene Expression Omnibus by the crowd. Nat Commun 2016; 7:12846. [PMID: 27667448 PMCID: PMC5052684 DOI: 10.1038/ncomms12846] [Citation(s) in RCA: 156] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 08/05/2016] [Indexed: 12/14/2022] Open
Abstract
Gene expression data are accumulating exponentially in public repositories. Reanalysis and integration of themed collections from these studies may provide new insights, but requires further human curation. Here we report a crowdsourcing project to annotate and reanalyse a large number of gene expression profiles from Gene Expression Omnibus (GEO). Through a massive open online course on Coursera, over 70 participants from over 25 countries identify and annotate 2,460 single-gene perturbation signatures, 839 disease versus normal signatures, and 906 drug perturbation signatures. All these signatures are unique and are manually validated for quality. Global analysis of these signatures confirms known associations and identifies novel associations between genes, diseases and drugs. The manually curated signatures are used as a training set to develop classifiers for extracting similar signatures from the entire GEO repository. We develop a web portal to serve these signatures for query, download and visualization.
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Affiliation(s)
- Zichen Wang
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Caroline D. Monteiro
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Kathleen M. Jagodnik
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
- Fluid Physics and Transport Processes Branch, NASA Glenn Research Center, 21000 Brookpark Rd, Cleveland, Ohio 44135, USA
- Center for Space Medicine, Baylor College of Medicine, 1 Baylor Plaza, Houston, Texas 77030, USA
| | - Nicolas F. Fernandez
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Gregory W. Gundersen
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Andrew D. Rouillard
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Sherry L. Jenkins
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Axel S. Feldmann
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Kevin S. Hu
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Michael G. McDermott
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Qiaonan Duan
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Neil R. Clark
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Matthew R. Jones
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Yan Kou
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | - Troy Goff
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
| | | | - Fabio M R. Amaral
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, Leicestershire LE12 5RD, UK
| | - Gregory L. Szeto
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- Department of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- The Ragon Institute of MGH, MIT, and Harvard, 400 Technology Square, Cambridge, Massachusetts 02139, USA
| | - Oliver Fuchs
- Paediatric Allergology and Pulmonology, Dr von Hauner University Children's Hospital, Ludwig-Maximilians-University of Munich, Member of the German Centre for Lung Research (DZL), Lindwurmstrasse 4, Munich 80337, Germany
| | - Sophia M. Schüssler-Fiorenza Rose
- Spinal Cord Injury Service, Veteran Affairs Palo Alto Health Care System, Palo Alto, California 94304, USA
- Department of Neurosurgery, Stanford School of Medicine, Stanford, California 94304, USA
| | - Shvetank Sharma
- Department of Research, Institute of Liver & Biliary Sciences, D1, Vasant Kunj, New Delhi 110070, India
| | - Uwe Schwartz
- Department of Biochemistry III, University of Regensburg, Universitätsstrasse 31, Regensburg 93053, Germany
| | - Xabier Bengoetxea Bausela
- Department of Pharmacology and Toxicology, University of Navarra, Pamplona, Irunlarrea 1, Pamplona 31008, Spain
| | - Maciej Szymkiewicz
- Warsaw School of Information Technology under the auspices of the Polish Academy of Sciences, 6 Newelska St, Warsaw 01–447, Poland
| | | | - Anton Salykin
- Department of Biology, Faculty of Medicine, Masaryk University, Brno 625 00, Czech Republic
| | - Carolina M. Barra
- IMIM-Hospital Del Mar, PRBB Barcelona, Dr Aiguader, Barcelona 88.08003, Spain
| | | | - Nicholas J. Bongio
- Department of Biology, Shenandoah University, 1460 University Dr Winchester, Winchester, Virginia 22601, USA
| | | | | | - Udi E. Rubin
- Department of Biological Sciences, 600 Fairchild Center, Mail Code 2402, Columbia University, New York, New York 10032, USA
| | - Apostolos Malatras
- Center for Research in Myology, Sorbonne Universités, UPMC Univ Paris 06, INSERM UMRS975, CNRS FRE3617, 47 Boulevard de l'hôpital, Paris 75013, France
| | - Carl T. Fulp
- 13-1, Higashi 4-chome Shibuya-ku, Tokyo 150-0011, Japan
| | - John A. Galindo
- Department of Biology and Institute of Genetics, Universidad Nacional de Colombia, Bogota, Cr. 30 # 45-08, Colombia
| | - Ruta Motiejunaite
- Center for Interdisciplinary Cardiovascular Sciences, Brigham and Women's Hospital, 3 Blackfan Circle, Boston, Massachusetts 02115, USA
| | - Christoph Jüschke
- Department of Human Genetics, Faculty of Medicine and Health Sciences, University of Oldenburg, Ammerländer Heerstrasse 114-118, Oldenburg 26129, Germany
| | | | - Katharina Lahl
- Technical University of Denmark, National Veterinary Institute, Bülowsvej 27 Building 2-3, Frederiksberg C 1870, Denmark
| | - Mohieddin Jafari
- Protein Chemistry and Proteomics Unit, Biotechnology Research Center, Pasteur Institute of Iran, No. 358, 12th Farwardin Ave, Jomhhoori St, Tehran 13164, Iran
- School of Biological Sciences, Institute for Researches in Fundamental Sciences, Niavaran Square, P.O.Box, Tehran 19395-5746, Iran
| | - Sara Aibar
- University of Salamanca, Salamanca, Madrid 37008, Spain
| | - Apostolos Zaravinos
- Division of Clinical Immunology, Department of Laboratory Medicine, Karolinska Institute, Alfred Nobels Allé 8, level 7, Stockholm SE141 86, Sweden
- Department of Life Sciences, School of Sciences, European University Cyprus, 6 Diogenes Str. Engomi, P.O.Box 22006, Nicosia 1516, Cyprus
| | | | | | | | - Fernando de Andres Segura
- CICAB, Clinical Research Centre, Extremadura University Hospital, Elvas Av., s/n. 06006 Badajoz 06006, Spain
| | | | - Vicente Pérez-García
- Consejo Superior de Investigaciones Científicas, Centro Nacional de Biotecnología, Department of Immunology and Oncology, c/Darwin, 3 Madrid 28049, Spain
| | - Avi Ma'ayan
- Department of Pharmacological Sciences, BD2K-LINCS Data Coordination and Integration Center, Illuminating the Druggable Genome Knowledge Management Center, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place Box 1215, New York, New York 10029, USA
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112
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Zhang J, An X, Han Y, Ma R, Yang K, Zhang L, Chi J, Li W, Llobet-Navas D, Xu Y, Jiang Y. Overexpression of JARID1B promotes differentiation via SHIP1/AKT signaling in human hypopharyngeal squamous cell carcinoma. Cell Death Dis 2016; 7:e2358. [PMID: 27584795 PMCID: PMC5059865 DOI: 10.1038/cddis.2016.262] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 06/26/2016] [Accepted: 07/14/2016] [Indexed: 12/23/2022]
Abstract
Histone H3 (H3K4) demethylase JARID1B is aberrantly upregulated in many types of tumor and has been proposed to function as oncogene. Here we show that JARID1B is elevated in moderate and high-differentiated human hypopharyngeal squamous cell carcinoma (HPSCC) compared with low-differentiated HPSCC. Overexpression of JARID1B in FaDu cells increased epithelial differentiation marker K10 expression and inhibited cell proliferation. JARID1B and K10 mRNA expression is high correlated in HPSCC patients. Mechanistically, we found JARID1B directly bound to PI3K/AKT signaling inhibitor SHIP1 gene promoter and decreased SHIP1 gene expression. Activation of downstream AKT resulted in increased β-catenin signaling, by which promoted target genes Fra-1 and Jun, together with other AP-1 transcription factors, leading to K10 expression. Forced expression of SHIP1 rescued JARID1B-induced phenotypes on FaDu cell differentiation and proliferation. Taken together, our findings provide first evidence that elevated expression of JARID1B has a critical role in promoting HPSCC differentiation and inhibiting proliferation, suggesting JARID1B may function as a tumor suppressor in squamous cell cancers and implying a novel important therapeutic strategy of HPSCC.
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Affiliation(s)
- Jisheng Zhang
- Key Laboratory, Department of Otolaryngology-Head and Neck Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, China
| | - Xiaofei An
- Department of Endocrinology, Jiangsu Province Hospital of Chinese Medicine, 155 Han Zhong Road, Nanjing 210029, China
| | - Yafei Han
- Key Laboratory, Department of Otolaryngology-Head and Neck Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, China
| | - Rui Ma
- Department of Nephrology, Affiliated Hospital of Qingdao University, Qingdao 266 003, China
| | - Kun Yang
- Key Laboratory, Department of Otolaryngology-Head and Neck Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, China
| | - Lu Zhang
- Key Laboratory, Department of Otolaryngology-Head and Neck Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, China
| | - Jingwei Chi
- Key Laboratory, Department of Otolaryngology-Head and Neck Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, China
| | - Wei Li
- Key Laboratory, Department of Otolaryngology-Head and Neck Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, China
| | - David Llobet-Navas
- Institute of Genetic Medicine-Newcastle University, Newcastle upon Tyne NE1 3BZ, UK
| | - Yan Xu
- Department of Nephrology, Affiliated Hospital of Qingdao University, Qingdao 266 003, China
| | - Yan Jiang
- Key Laboratory, Department of Otolaryngology-Head and Neck Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, China
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113
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Abstract
The molecular processes underlying intestinal adaptation to fasting and re-feeding remain largely uncharacterized. In this issue of Cell Reports, Richmond et al. report that dormant intestinal stem cells are regulated by PTEN and nutritional status.
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Affiliation(s)
- Badi Sri Sailaja
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA
| | - Xi C He
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA
| | - Linheng Li
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA; Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS 66101, USA.
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114
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Toba H, Wang Y, Bai X, Zamel R, Cho HR, Liu H, Lira A, Keshavjee S, Liu M. XB130 promotes bronchioalveolar stem cell and Club cell proliferation in airway epithelial repair and regeneration. Oncotarget 2016; 6:30803-17. [PMID: 26360608 PMCID: PMC4741569 DOI: 10.18632/oncotarget.5062] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 08/21/2015] [Indexed: 02/06/2023] Open
Abstract
Proliferation of bronchioalveolar stem cells (BASCs) is essential for epithelial repair. XB130 is a novel adaptor protein involved in the regulation of epithelial cell survival, proliferation and migration through the PI3K/Akt pathway. To determine the role of XB130 in airway epithelial injury repair and regeneration, a naphthalene-induced airway epithelial injury model was used with XB130 knockout (KO) mice and their wild type (WT) littermates. In XB130 KO mice, at days 7 and 14, small airway epithelium repair was significantly delayed with fewer number of Club cells (previously called Clara cells). CCSP (Club cell secreted protein) mRNA expression was also significantly lower in KO mice at day 7. At day 5, there were significantly fewer proliferative epithelial cells in the KO group, and the number of BASCs significantly increased in WT mice but not in KO mice. At day 7, phosphorylation of Akt, GSK-3β, and the p85α subunit of PI3K was observed in airway epithelial cells in WT mice, but to a much lesser extent in KO mice. Microarray data also suggest that PI3K/Akt-related signals were regulated differently in KO and WT mice. An inhibitory mechanism for cell proliferation and cell cycle progression was suggested in KO mice. XB130 is involved in bronchioalveolar stem cell and Club cell proliferation, likely through the PI3K/Akt/GSK-3β pathway.
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Affiliation(s)
- Hiroaki Toba
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, Universal Health Network, Toronto, ON, Canada
| | - Yingchun Wang
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, Universal Health Network, Toronto, ON, Canada
| | - Xiaohui Bai
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, Universal Health Network, Toronto, ON, Canada
| | - Ricardo Zamel
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, Universal Health Network, Toronto, ON, Canada
| | - Hae-Ra Cho
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, Universal Health Network, Toronto, ON, Canada
| | - Hongmei Liu
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, Universal Health Network, Toronto, ON, Canada
| | - Alonso Lira
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, Universal Health Network, Toronto, ON, Canada
| | - Shaf Keshavjee
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, Universal Health Network, Toronto, ON, Canada.,Department of Surgery, Faculty of Medicine, University of Toronto, Toronto, ON, Canada.,Institute of Medical Science, Faculty of Medicine, University of Toronto, Toronto, ON, Canada
| | - Mingyao Liu
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, Universal Health Network, Toronto, ON, Canada.,Department of Surgery, Faculty of Medicine, University of Toronto, Toronto, ON, Canada.,Institute of Medical Science, Faculty of Medicine, University of Toronto, Toronto, ON, Canada
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115
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Wang J, Xu J, Fu J, Yuan D, Guo F, Zhou C, Shao C. MiR-29a Regulates Radiosensitivity in Human Intestinal Cells by Targeting PTEN Gene. Radiat Res 2016; 186:292-301. [PMID: 27548517 DOI: 10.1667/rr14428.1] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Two major challenges encountered during radiotherapy for colorectal cancer (CRC) are radioresistance of tumor cells and damage to normal cells. An understanding of the mechanisms of radioresistance in CRC may lead to new strategies for overcoming obstacles to affective clinical therapy. In this study, the miR-29a expression was compared among four cell lines: the normal human intestinal epithelial crypt cell line, HIEC and three CRC cell lines, HT29, DLD-1 and HCT116. The roles of miR-29a in regulating cellular radiosensitivity were then investigated. The findings from this study showed that miR-29a mimic enhanced radioresistance in HIEC, HT29 and DLD-1 cells with low levels of intrinsic miR-29a. On the other hand, a miR-29a inhibitor significantly sensitized HCT116 cells with high levels of miR-29a after irradiation. Further studies indicated that PTEN was the direct functional target of miR-29a and was involved in radiosensitivity. MiR-29a could activate the PI3K/Akt signaling pathway through negatively regulated PTEN expression. In conclusion, miR-29a may regulate the radiosensitivity of intestinal cell lines by targeting the PTEN gene, which indicates miR-29a might serve as a novel approach to enhance radiosensitivity in CRC.
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Affiliation(s)
- Juan Wang
- Institute of Radiation Medicine, Fudan University, Shanghai 200032, China
| | - Jinping Xu
- Institute of Radiation Medicine, Fudan University, Shanghai 200032, China
| | - Jiamei Fu
- Institute of Radiation Medicine, Fudan University, Shanghai 200032, China
| | - Dexiao Yuan
- Institute of Radiation Medicine, Fudan University, Shanghai 200032, China
| | - Fei Guo
- Institute of Radiation Medicine, Fudan University, Shanghai 200032, China
| | - Cuiping Zhou
- Institute of Radiation Medicine, Fudan University, Shanghai 200032, China
| | - Chunlin Shao
- Institute of Radiation Medicine, Fudan University, Shanghai 200032, China
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116
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Sailaja BS, He XC, Li L. The regulatory niche of intestinal stem cells. J Physiol 2016; 594:4827-36. [PMID: 27060879 DOI: 10.1113/jp271931] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 03/29/2016] [Indexed: 12/14/2022] Open
Abstract
The niche constitutes a unique category of cells that support the microenvironment for the maintenance and self-renewal of stem cells. Intestinal stem cells reside at the base of the crypt, which contains adjacent epithelial cells, stromal cells and smooth muscle cells, and soluble and cell-associated growth and differentiation factors. We summarize here recent advances in our understanding of the crucial role of the niche in regulating stem cells. The stem cell niche maintains a balance among quiescence, proliferation and regeneration of intestinal stem cells after injury. Mesenchymal cells, Paneth cells, immune cells, endothelial cells and neural cells are important regulatory components that secrete niche ligands, growth factors and cytokines. Intestinal homeostasis is regulated by niche signalling pathways, specifically Wnt, bone morphogenetic protein, Notch and epidermal growth factor. These insights into the regulatory stem cell niche during homeostasis and post-injury regeneration offer the potential to accelerate development of therapies for intestine-related disorders.
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Affiliation(s)
- Badi Sri Sailaja
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Xi C He
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Linheng Li
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA.,Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS, 66101, USA
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117
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Lee JE, Lim MS, Park JH, Park CH, Koh HC. PTEN Promotes Dopaminergic Neuronal Differentiation Through Regulation of ERK-Dependent Inhibition of S6K Signaling in Human Neural Stem Cells. Stem Cells Transl Med 2016; 5:1319-1329. [PMID: 27388240 DOI: 10.5966/sctm.2015-0200] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 04/18/2016] [Indexed: 02/05/2023] Open
Abstract
: Phosphatase and tension homolog (PTEN) is a widely known negative regulator of insulin/phosphatidylinositol 3-kinase (PI3K) signaling. The PI3K/Akt/mammalian target of rapamycin (PI3K/Akt/mTOR) and Ras-extracellular signal-regulated kinase (Ras-ERK) signaling pathways are the chief mechanisms controlling the survival, proliferation, and differentiation of neural stem cells (NSCs). However, the roles of PTEN in Akt/mTOR and ERK signaling during proliferation and neuronal differentiation of human NSCs (hNSCs) are poorly understood. Treatment of proliferating hNSCs with a specific inhibitor of PTEN or overexpression of the PTEN inactive mutant G129E resulted in an increase in the expression levels of Ki67, p-S6 kinase (p-S6K), and p-ERK without affecting p-Akt expression during proliferation of hNSCs. Therefore, we focused on the regulatory effect of PTEN in S6K and ERK signaling during dopaminergic neuronal differentiation of hNSCs. Overexpression of PTEN during neuronal differentiation of hNSCs caused an increase in p-S6K expression and a decrease in p-ERK expression. Conversely, inhibition of PTEN increased p-ERK expression and decreased p-S6K expression. Inhibition of ERK by a specific chemical inhibitor, U0126, promoted neuronal generation, especially of tyrosine hydroxylase-positive neurons. p-S6K expression increased in a time-dependent manner during differentiation, and this effect was enhanced by U0126. These results indicated that PTEN promoted neuronal differentiation by inhibition of ERK signaling, which in turn induced activation of S6K. Our data suggest that ERK pathways participate in crosstalk with S6K through PTEN signaling during neuronal differentiation of hNSCs. These results represent a novel pathway by which PTEN may modulate the interplay between ERK and S6K signaling, leading to increased neuronal differentiation in hNSCs. SIGNIFICANCE This article adds to the body of knowledge about the mechanism of extracellular signal-regulated kinase (ERK)-mediated differentiation by describing the molecular function of phosphatase and tension homolog (PTEN) during the neuronal differentiation of human neural stem cells (hNSCs). Previous studies showed that S6K signaling promoted neuronal differentiation in hNSCs via the phosphatidylinositol 3-kinase Akt-mammalian target of rapamycin signaling pathway. A further series of studies investigated whether this S6 kinase-induced differentiation in hNSCs involves regulation of ERK signaling by PTEN. The current study identified a novel mechanism by which PTEN regulates neuronal differentiation in hNSCs, suggesting that activating PTEN function promotes dopaminergic neuronal differentiation and providing an important resource for future studies of PTEN function.
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Affiliation(s)
- Jeong Eun Lee
- Department of Pharmacology, College of Medicine, Hanyang University, Seoul, Republic of Korea Hanyang Biomedical Research Institute, Seoul, Republic of Korea
| | - Mi Sun Lim
- Hanyang Biomedical Research Institute, Seoul, Republic of Korea Graduate School of Biomedical Science and Engineering, Hanyang University, Seoul, Republic of Korea Research and Development Center, Jeil Pharmaceutical Company, Limited, Yongin, Republic of Korea
| | - Jae Hyeon Park
- Department of Pharmacology, College of Medicine, Hanyang University, Seoul, Republic of Korea Hanyang Biomedical Research Institute, Seoul, Republic of Korea Graduate School of Biomedical Science and Engineering, Hanyang University, Seoul, Republic of Korea
| | - Chang Hwan Park
- Hanyang Biomedical Research Institute, Seoul, Republic of Korea Graduate School of Biomedical Science and Engineering, Hanyang University, Seoul, Republic of Korea
| | - Hyun Chul Koh
- Department of Pharmacology, College of Medicine, Hanyang University, Seoul, Republic of Korea Hanyang Biomedical Research Institute, Seoul, Republic of Korea Graduate School of Biomedical Science and Engineering, Hanyang University, Seoul, Republic of Korea
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118
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Richmond CA, Shah MS, Carlone DL, Breault DT. An enduring role for quiescent stem cells. Dev Dyn 2016; 245:718-26. [PMID: 27153394 DOI: 10.1002/dvdy.24416] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 04/22/2016] [Accepted: 04/30/2016] [Indexed: 12/12/2022] Open
Abstract
The intestine's ability to recover from catastrophic injury requires quiescent intestinal stem cells (q-ISCs). While rapidly cycling (Lgr5+) crypt base columnar (CBC) ISCs normally maintain the intestine, they are highly sensitive to pathological injuries (irradiation, inflammation) and must be restored by q-ISCs to sustain intestinal homeostasis. Despite clear relevance to human health, virtually nothing is known regarding the factors that regulate q-ISCs. A comprehensive understanding of these mechanisms would likely lead to targeted new therapies with profound therapeutic implications for patients with gastrointestinal conditions. We briefly review the current state of the literature, highlighting homeostatic mechanisms important for q-ISC regulation, listing key questions in the field, and offer strategies to address them. Developmental Dynamics 245:718-726, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Camilla A Richmond
- Division of Gastroenterology, Boston Children's Hospital, Boston, Massachusetts
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
| | - Manasvi S Shah
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
- Division of Endocrinology, Boston Children's Hospital, Boston, Massachusetts
| | - Diana L Carlone
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
- Division of Endocrinology, Boston Children's Hospital, Boston, Massachusetts
- Harvard Stem Cell Institute, Cambridge, Massachusetts
| | - David T Breault
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
- Division of Endocrinology, Boston Children's Hospital, Boston, Massachusetts
- Harvard Stem Cell Institute, Cambridge, Massachusetts
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119
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Kim HJ, Lee SY, Oh SC. The Inositide Signaling Pathway As a Target for Treating Gastric Cancer and Colorectal Cancer. Front Physiol 2016; 7:168. [PMID: 27242542 PMCID: PMC4861839 DOI: 10.3389/fphys.2016.00168] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 04/25/2016] [Indexed: 12/12/2022] Open
Abstract
Gastric cancer and colorectal cancer are the leading cause of cancer mortality and have a dismal prognosis. The introduction of biological agents to treat these cancers has resulted in improved outcomes, and combination chemotherapy with targeted agents and conventional chemotherapeutic agents is regarded as standard therapy. Additional newly clarified mechanisms of oncogenesis and resistance to targeted agents require the development of new biologic agents. Aberrant activation of the inositide signaling pathway by a loss of function PTEN mutation or gain of function mutation/amplification of PIK3CA is an oncogenic mechanism in gastric cancer and colorectal cancer. Clinical trials with biologic agents that target the inositide signaling pathway are being performed to further improve treatment outcomes of patients with advanced gastric cancer and metastatic colorectal cancer (CRC). In this review we summarize the inositide signaling pathway, the targeted agents that inhibit abnormal activation of this signaling pathway and the clinical trials currently being performed in patients with advanced or metastatic gastric cancer and metastatic CRC using these targeted agents.
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Affiliation(s)
- Hong Jun Kim
- Division of Oncology/Hematology, Department of Internal Medicine, College of Medicine, Korea University Seoul, South Korea
| | - Suk-Young Lee
- Division of Oncology/Hematology, Department of Internal Medicine, College of Medicine, Korea University Seoul, South Korea
| | - Sang Cheul Oh
- Division of Oncology/Hematology, Department of Internal Medicine, College of Medicine, Korea University Seoul, South Korea
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120
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Wu S, Wang S, Zheng S, Verhaak R, Koul D, Yung WKA. MSK1-Mediated β-Catenin Phosphorylation Confers Resistance to PI3K/mTOR Inhibitors in Glioblastoma. Mol Cancer Ther 2016; 15:1656-68. [PMID: 27196759 DOI: 10.1158/1535-7163.mct-15-0857] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 04/15/2016] [Indexed: 12/20/2022]
Abstract
Glioblastoma (GBM) represents a compelling disease for kinase inhibitor therapy because most of these tumors harbor genetic alterations that result in aberrant activation of growth factor-signaling pathways. The PI3K/mammalian target of the rapamycin (mTOR) pathway is dysregulated in over 50% of human GBM but remains a challenging clinical target. Inhibitors against PI3K/mTOR mediators have limited clinical efficacy as single agents. We investigated potential bypass mechanisms to PI3K/mTOR inhibition using gene expression profiling before and after PI3K inhibitor treatment by Affymetrix microarrays. Mitogen- and stress-activated protein kinase 1 (MSK1) was markedly induced after PI3K/mTOR inhibitor treatment and disruption of MSK1 by specific shRNAs attenuated resistance to PI3K/mTOR inhibitors in glioma-initiating cells (GIC). Further investigation showed that MSK1 phosphorylates β-catenin and regulates its nuclear translocation and transcriptional activity. The depletion of β-catenin potentiated PI3K/mTOR inhibitor-induced cytotoxicity and the inhibition of MSK1 synergized with PI3K/mTOR inhibitors to extend survival in an intracranial animal model and decreased phosphorylation of β-catenin at Ser(552) These observations suggest that MSK1/β-catenin signaling serves as an escape survival signal upon PI3K/mTOR inhibition and provides a strong rationale for the combined use of PI3K/mTOR and MSK1/β-catenin inhibition to induce lethal growth inhibition in human GBM. Mol Cancer Ther; 15(7); 1656-68. ©2016 AACR.
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Affiliation(s)
- Shaofang Wu
- Brain Tumor Center, Department of Neuro-Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Shuzhen Wang
- Brain Tumor Center, Department of Neuro-Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Siyuan Zheng
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Roel Verhaak
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Dimpy Koul
- Brain Tumor Center, Department of Neuro-Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
| | - W K Alfred Yung
- Brain Tumor Center, Department of Neuro-Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
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121
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Goretsky T, Bradford EM, Ryu H, Tahir M, Moyer MP, Gao T, Li L, Barrett TA. A Cytosolic Multiprotein Complex Containing p85α Is Required for β-Catenin Activation in Colitis and Colitis-associated Cancer. J Biol Chem 2016; 291:4166-77. [PMID: 26565021 PMCID: PMC4759191 DOI: 10.1074/jbc.m115.669416] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 11/02/2015] [Indexed: 11/06/2022] Open
Abstract
Wnt/β-catenin signaling is required for crypt structure maintenance. We previously observed nuclear accumulation of Ser-552 phosphorylated β-catenin (pβ-Cat(Ser-552)) in intestinal epithelial cells (IEC) during colitis and colitis-associated cancer. Data here delineate a novel multiprotein cytosolic complex (MCC) involved in β-catenin signaling in the intestine. The MCC contains p85α, the class IA subunit of PI3K, along with β-catenin, 14-3-3ζ, Akt, and p110α. MCC levels in IEC increase in colitis and colitis-associated cancer patients. IEC-specific p85α-deficient (p85(ΔIEC)) mice develop more severe dextran sodium sulfate colitis due to delayed ulcer healing and reduced epithelial β-catenin activation. In colonic IEC, p85α deficiency did not alter PI3K signaling. In vitro shRNA depletion of individual complex members disrupts the MCC and reduces β-catenin signaling. Despite worse colitis, p85(ΔIEC) mice have reduced tumor burden after azoxymethane/dextran sodium sulfate treatment. Together the data indicate that the β-catenin MCC is needed for mucosal repair and carcinogenesis. This novel MCC may be an attractive therapeutic target in preventing cancer in colitis patients.
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Affiliation(s)
- Tatiana Goretsky
- From the Department of Internal Medicine, Division of Gastroenterology, University of Kentucky, Lexington, Kentucky 40536
| | - Emily M Bradford
- From the Department of Internal Medicine, Division of Gastroenterology, University of Kentucky, Lexington, Kentucky 40536
| | - Hyunji Ryu
- the Washington University School of Medicine, St. Louis, Missouri 63110
| | - Maryam Tahir
- From the Department of Internal Medicine, Division of Gastroenterology, University of Kentucky, Lexington, Kentucky 40536
| | | | - Tianyan Gao
- the Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536, and
| | - Linheng Li
- the Stowers Institute for Medical Research, Department of Pathology & Laboratory Medicine, The University of Kansas School of Medicine, Kansas City, Kansas 66160
| | - Terrence A Barrett
- From the Department of Internal Medicine, Division of Gastroenterology, University of Kentucky, Lexington, Kentucky 40536,
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Zhang S, Chen X, Hu Y, Wu J, Cao Q, Chen S, Gao Y. All-trans retinoic acid modulates Wnt3A-induced osteogenic differentiation of mesenchymal stem cells via activating the PI3K/AKT/GSK3β signalling pathway. Mol Cell Endocrinol 2016; 422:243-253. [PMID: 26747727 DOI: 10.1016/j.mce.2015.12.018] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2015] [Revised: 12/19/2015] [Accepted: 12/24/2015] [Indexed: 01/06/2023]
Abstract
Osteogenic differentiation of mesenchymal stem cells (MSCs) is a vital process for the maintenance of healthy bone tissue and is mediated by numerous factors. Canonical Wnt signalling is essential for MSC osteogenic differentiation, and it interacts with several nuclear receptors, including the retinoic acid receptor, vitamin D receptor, and glucocorticoid receptor. Here, we explored whether Wnt3A and all-trans-retinoic acid (ATRA) play synergistic roles in MSC osteogenic differentiation. We found that ATRA potentiated the Wnt3A-induced expression of early and late osteogenic markers as well as matrix mineralization and further confirmed the phenomena using foetal limb explant culture and MSC implantation experiments. Mechanistically, ATRA cooperated with Wnt3A to induce β-catenin translocation from cell-cell contacts into the cytosol and nucleus, thereby activating Wnt/β-catenin signalling. Additionally, Wnt3A attenuated ATRA-induced Cyp26a1 expression, inhibiting the degradation of ATRA into its oxidative forms. β-catenin silencing abolished the stimulatory effect of ATRA on Wnt3A-induced alkaline phosphatase (ALP) activity and reversed its inhibitory effect on Cyp26a1 expression. Furthermore, ATRA and Wnt3A synergistically promoted AKT phosphorylation, enhancing β-catenin-dependent transcription through GSK3β inhibition or direct β-catenin phosphorylation at Ser552. This event was largely abolished by LY294002 pre-treatment, suggesting that ATRA and Wnt3A at least partially promote osteogenic differentiation via activating the PI3K/AKT/GSK3β signalling pathway. Thus, crosstalk between the Wnt/β-catenin and retinoic acid signalling pathways may be an effective therapeutic target for bone diseases, such as osteoporosis.
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Affiliation(s)
- Shuang Zhang
- Department of Geriatrics, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xiaoting Chen
- Department of Geriatrics, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yan Hu
- Department of Geriatrics, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Jin Wu
- Shanghai Institute for Pediatric Research, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Qing Cao
- Department of Geriatrics, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Shuyan Chen
- Department of Geriatrics, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yanhong Gao
- Department of Geriatrics, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.
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Abstract
The disproportional enlargement of the neocortex through evolution has been instrumental in the success of vertebrates, in particular mammals. The neocortex is a multilayered sheet of neurons generated from a simple proliferative neuroepithelium through a myriad of mechanisms with substantial evolutionary conservation. This developing neuroepithelium is populated by progenitors that can generate additional progenitors as well as post-mitotic neurons. Subtle alterations in the production of progenitors vs. differentiated cells during development can result in dramatic differences in neocortical size. This review article will examine how cadherin adhesion proteins, in particular α-catenin and N-cadherin, function in regulating the neural progenitor microenvironment, cell proliferation, and differentiation in cortical development.
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Key Words
- APC, Adenomatous polyposis coli.
- CBD, catenin binding domain
- CK1, Casein kinase 1
- GSK3β, glycogen synthase kinase 3β
- Hh, Hedgehog
- JMD, juxtamembrane domain
- N-cadherin
- PCP, planar cell polarity
- PI3K, phosphatidylinositol 3-kinase
- PTEN, phosphatase and tensin homolog
- SHH, sonic hedgehog
- SNP, short neural precursor
- VZ, ventricular zone
- adherens junction
- differentiation
- proliferation
- wnt
- α-catenin
- β-catenin
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Affiliation(s)
- Adam M Stocker
- a Molecular Neurobiology Laboratory ; The Salk Institute ; La Jolla , CA USA
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Wang J, Han L, Sinnett-Smith J, Han LL, Stevens JV, Rozengurt N, Young SH, Rozengurt E. Positive cross talk between protein kinase D and β-catenin in intestinal epithelial cells: impact on β-catenin nuclear localization and phosphorylation at Ser552. Am J Physiol Cell Physiol 2016; 310:C542-57. [PMID: 26739494 DOI: 10.1152/ajpcell.00302.2015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 01/05/2016] [Indexed: 12/17/2022]
Abstract
Given the fundamental role of β-catenin signaling in intestinal epithelial cell proliferation and the growth-promoting function of protein kinase D1 (PKD1) in these cells, we hypothesized that PKDs mediate cross talk with β-catenin signaling. The results presented here provide several lines of evidence supporting this hypothesis. We found that stimulation of intestinal epithelial IEC-18 cells with the G protein-coupled receptor (GPCR) agonist angiotensin II (ANG II), a potent inducer of PKD activation, promoted endogenous β-catenin nuclear localization in a time-dependent manner. A significant increase was evident within 1 h of ANG II stimulation (P< 0.01), peaked at 4 h (P< 0.001), and declined afterwards. GPCR stimulation also induced a marked increase in β-catenin-regulated genes and phosphorylation at Ser(552) in intestinal epithelial cells. Exposure to preferential inhibitors of the PKD family (CRT006610 or kb NB 142-70) or knockdown of the isoforms of the PKD family prevented the increase in β-catenin nuclear localization and phosphorylation at Ser(552) in response to ANG II. GPCR stimulation also induced the formation of a complex between PKD1 and β-catenin, as shown by coimmunoprecipitation that depended on PKD1 catalytic activation, as it was abrogated by cell treatment with PKD family inhibitors. Using transgenic mice that express elevated PKD1 protein in the intestinal epithelium, we detected a marked increase in the localization of β-catenin in the nucleus of crypt epithelial cells in the ileum of PKD1 transgenic mice, compared with nontransgenic littermates. Collectively, our results identify a novel cross talk between PKD and β-catenin in intestinal epithelial cells, both in vitro and in vivo.
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Affiliation(s)
- Jia Wang
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine, Los Angeles, California
| | - Liang Han
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine, Los Angeles, California
| | - James Sinnett-Smith
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine, Los Angeles, California; CURE, Digestive Diseases Research Center, Los Angeles, California; Veterans Affairs Greater Los Angeles Health Care System, Los Angeles, California
| | - Li-Li Han
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine, Los Angeles, California
| | - Jan V Stevens
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine, Los Angeles, California
| | - Nora Rozengurt
- CURE, Digestive Diseases Research Center, Los Angeles, California;
| | - Steven H Young
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine, Los Angeles, California; Veterans Affairs Greater Los Angeles Health Care System, Los Angeles, California
| | - Enrique Rozengurt
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine, Los Angeles, California; CURE, Digestive Diseases Research Center, Los Angeles, California; Molecular Biology Institute, University of California at Los Angeles, Los Angeles, California; and Veterans Affairs Greater Los Angeles Health Care System, Los Angeles, California
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125
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Li N, Yousefi M, Nakauka-Ddamba A, Li F, Vandivier L, Parada K, Woo DH, Wang S, Naqvi AS, Rao S, Tobias J, Cedeno RJ, Minuesa G, Y K, Barlowe TS, Valvezan A, Shankar S, Deering RP, Klein PS, Jensen ST, Kharas MG, Gregory BD, Yu Z, Lengner CJ. The Msi Family of RNA-Binding Proteins Function Redundantly as Intestinal Oncoproteins. Cell Rep 2015; 13:2440-2455. [PMID: 26673327 DOI: 10.1016/j.celrep.2015.11.022] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 09/08/2015] [Accepted: 11/04/2015] [Indexed: 12/19/2022] Open
Abstract
Members of the Msi family of RNA-binding proteins have recently emerged as potent oncoproteins in a range of malignancies. MSI2 is highly expressed in hematopoietic cancers, where it is required for disease maintenance. In contrast to the hematopoietic system, colorectal cancers can express both Msi family members, MSI1 and MSI2. Here, we demonstrate that, in the intestinal epithelium, Msi1 and Msi2 have analogous oncogenic effects. Further, comparison of Msi1/2-induced gene expression programs and transcriptome-wide analyses of Msi1/2-RNA-binding targets reveal significant functional overlap, including induction of the PDK-Akt-mTORC1 axis. Ultimately, we demonstrate that concomitant loss of function of both MSI family members is sufficient to abrogate the growth of human colorectal cancer cells, and Msi gene deletion inhibits tumorigenesis in several mouse models of intestinal cancer. Our findings demonstrate that MSI1 and MSI2 act as functionally redundant oncoproteins required for the ontogeny of intestinal cancers.
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Affiliation(s)
- Ning Li
- State Key Laboratories for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100194, China; Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Maryam Yousefi
- Cell and Molecular Biology Graduate Program, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Angela Nakauka-Ddamba
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Fan Li
- Department of Biology, School of Arts and Sciences, University of Pennsylvania, Philadelphia, PA 19104, USA; Genomics and Computational Biology Graduate Program, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Lee Vandivier
- Department of Biology, School of Arts and Sciences, University of Pennsylvania, Philadelphia, PA 19104, USA; Cell and Molecular Biology Graduate Program, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kimberly Parada
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Dong-Hun Woo
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Shan Wang
- State Key Laboratories for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100194, China; Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Ammar S Naqvi
- Department of Biology, School of Arts and Sciences, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Shilpa Rao
- PENN Molecular Profiling Facility, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - John Tobias
- PENN Molecular Profiling Facility, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Ryan J Cedeno
- Cell and Molecular Biology Graduate Program, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Gerard Minuesa
- Molecular Pharmacology and Chemistry Program, Experimental Therapeutics Center and Center for Stem Cell Biology, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
| | - Katz Y
- Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA
| | - Trevor S Barlowe
- Molecular Pharmacology and Chemistry Program, Experimental Therapeutics Center and Center for Stem Cell Biology, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
| | - Alexander Valvezan
- Cell and Molecular Biology Graduate Program, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Medicine, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Sheila Shankar
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | | | - Peter S Klein
- Cell and Molecular Biology Graduate Program, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Medicine, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Shane T Jensen
- Department of Statistics, The Wharton School, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Michael G Kharas
- Molecular Pharmacology and Chemistry Program, Experimental Therapeutics Center and Center for Stem Cell Biology, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
| | - Brian D Gregory
- Department of Biology, School of Arts and Sciences, University of Pennsylvania, Philadelphia, PA 19104, USA; Genomics and Computational Biology Graduate Program, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Zhengquan Yu
- State Key Laboratories for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100194, China.
| | - Christopher J Lengner
- Center for Molecular Studies in Digestive and Liver Diseases, University of Pennsylvania, Philadelphia, PA 19104, USA; Cell and Molecular Biology Graduate Program, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Cell and Developmental Biology, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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Wang D, Fu L, Sun H, Guo L, DuBois RN. Prostaglandin E2 Promotes Colorectal Cancer Stem Cell Expansion and Metastasis in Mice. Gastroenterology 2015; 149:1884-1895.e4. [PMID: 26261008 PMCID: PMC4762503 DOI: 10.1053/j.gastro.2015.07.064] [Citation(s) in RCA: 195] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 07/09/2015] [Accepted: 07/30/2015] [Indexed: 12/20/2022]
Abstract
BACKGROUND & AIMS Inflammation may contribute to the formation, maintenance, and expansion of cancer stem cells (CSCs), which have the capacity for self-renewal, differentiation, and resistance to cytotoxic agents. We investigated the effects of the inflammatory mediator prostaglandin E2 (PGE2) on colorectal CSC development and metastasis in mice and the correlation between levels of PGE2 and CSC markers in human colorectal cancer (CRC) specimens. METHODS Colorectal carcinoma specimens and matched normal tissues were collected from patients at the Mayo Clinic (Scottsdale, AZ) and analyzed by mass spectrometry and quantitative polymerase chain reaction. Human primary CRC cells and mouse tumor cells were isolated using microbeads or flow cytometry and analyzed for sphere-formation and by flow cytometry assays. LS-174T cells were sorted by flow cytometry (for CD133(+)CD44(+) and CD133(-)CD44(-) cells) and also used in these assays. NOD-scidIL-2Rγ(-/-) (NSG) mice were given cecal or subcutaneous injections of LS-174T or human primary CRC cells. Apc(Min/+) mice and NSG mice with orthotopic cecal tumors were given vehicle (controls), PGE2, celecoxib, and/or Ono-AE3-208. PGE2 downstream signaling pathways were knocked down with small hairpin RNAs, expressed from lentiviral vectors in LS-174T cells, or blocked with inhibitors in human primary CRC cells. RESULTS Levels of PGE2 correlated with colonic CSC markers (CD133, CD44, LRG5, and SOX2 messenger RNAs) in human colorectal carcinoma samples. Administration of PGE2 to Apc(Min/+) mice increased tumor stem cells and tumor burden, compared with controls. NSG mice given PGE2 had increased numbers of cecal CSCs and liver metastases compared with controls after intracecal injection of LS-174T or human primary CRC cells. Alternatively, celecoxib, an inhibitor of prostaglandin-endoperoxide synthase 2, reduced polyp numbers in Apc(Min/+) mice, liver metastasis in NSG mice with orthotopic tumors, and numbers of CSCs in Apc(Min/+) and NSG mice. Inhibitors or knockdown of PGE2 receptor 4 (EP4), phosphoinositide 3-kinase (PI3K) p85α, extracellular signal-regulated kinase 1 (ERK1), or nuclear factor (NF)-κB reduced PGE2-induced sphere formation and expansion of LS-174T and/or human primary CRC cells. Knockdown of ERK1 or PI3K p85α also attenuated PGE2-induced activation of NF-κB in LS-174T cells. An EP4 antagonist reduced the ability of PGE2 to induce CSC expansion in orthotopic tumors and to accelerate the formation of liver metastases. Knockdown experiments showed that NF-κB was required for PGE2 induction of CSCs and metastasis in mice. CONCLUSIONS PGE2 induces CSC expansion by activating NF-κB, via EP4-PI3K and EP4-mitogen-activated protein kinase signaling, and promotes the formation of liver metastases in mice. The PGE2 signaling pathway therefore might be targeted therapeutically to slow CSC expansion and colorectal cancer progression.
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Affiliation(s)
- Dingzhi Wang
- Laboratory for Inflammation and Cancer, Biodesign Institute of Arizona State University, Tempe, AZ 85287
| | - Lingchen Fu
- Laboratory for Inflammation and Cancer, Biodesign Institute of Arizona State University, Tempe, AZ 85287
| | - Haiyan Sun
- Laboratory for Inflammation and Cancer, Biodesign Institute of Arizona State University, Tempe, AZ 85287
| | - Lixia Guo
- Laboratory for Inflammation and Cancer, Biodesign Institute of Arizona State University, Tempe, AZ 85287,Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN 55905 (the present affiliation)
| | - Raymond N. DuBois
- Laboratory for Inflammation and Cancer, Biodesign Institute of Arizona State University, Tempe, AZ 85287,Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287,Department of Research and Division of Gastroenterology, Mayo Clinic, Scottsdale, AZ 85259,Correspondence to: Raymond N. DuBois, MD. Ph.D., Executive Director of the Biodesign Institute at Arizona State University, PO Box 875001, 1001 S. McAllister Ave., Tempe, AZ 85287, Tel: 480-965-1228 and Fax: 480-727-9550,
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127
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Ruiz de Sabando A, Wang C, He Y, García-Barros M, Kim J, Shroyer KR, Bannister TD, Yang VW, Bialkowska AB. ML264, A Novel Small-Molecule Compound That Potently Inhibits Growth of Colorectal Cancer. Mol Cancer Ther 2015; 15:72-83. [PMID: 26621868 DOI: 10.1158/1535-7163.mct-15-0600] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 10/14/2015] [Indexed: 12/25/2022]
Abstract
Colorectal cancer is one of the leading causes of cancer mortality in Western civilization. Studies have shown that colorectal cancer arises as a consequence of the modification of genes that regulate important cellular functions. Deregulation of the WNT and RAS/MAPK/PI3K signaling pathways has been shown to be important in the early stages of colorectal cancer development and progression. Krüppel-like factor 5 (KLF5) is a transcription factor that is highly expressed in the proliferating intestinal crypt epithelial cells. Previously, we showed that KLF5 is a mediator of RAS/MAPK and WNT signaling pathways under homeostatic conditions and that it promotes their tumorigenic functions during the development and progression of intestinal adenomas. Recently, using an ultrahigh-throughput screening approach we identified a number of novel small molecules that have the potential to provide therapeutic benefits for colorectal cancer by targeting KLF5 expression. In the current study, we show that an improved analogue of one of these screening hits, ML264, potently inhibits proliferation of colorectal cancer cells in vitro through modifications of the cell-cycle profile. Moreover, in an established xenograft mouse model of colon cancer, we demonstrate that ML264 efficiently inhibits growth of the tumor within 5 days of treatment. We show that this effect is caused by a significant reduction in proliferation and that ML264 potently inhibits the expression of KLF5 and EGR1, a transcriptional activator of KLF5. These findings demonstrate that ML264, or an analogue, may hold a promise as a novel therapeutic agent to curb the development and progression of colorectal cancer.
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Affiliation(s)
- Ainara Ruiz de Sabando
- Department of Medicine, Stony Brook University School of Medicine, Stony Brook, New York
| | - Chao Wang
- Department of Chemistry, The Scripps Research Institute, Jupiter, Florida
| | - Yuanjun He
- Department of Chemistry, The Scripps Research Institute, Jupiter, Florida
| | | | - Julie Kim
- Department of Medicine, Stony Brook University School of Medicine, Stony Brook, New York
| | - Kenneth R Shroyer
- Department of Pathology, Stony Brook University School of Medicine, Stony Brook, New York
| | - Thomas D Bannister
- Department of Chemistry, The Scripps Research Institute, Jupiter, Florida
| | - Vincent W Yang
- Department of Medicine, Stony Brook University School of Medicine, Stony Brook, New York. Department of Physiology and Biophysics, Stony Brook University School of Medicine, Stony Brook, New York.
| | - Agnieszka B Bialkowska
- Department of Medicine, Stony Brook University School of Medicine, Stony Brook, New York.
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Affiliation(s)
- Shoichi Date
- Department of Gastroenterology, Keio University School of Medicine, Tokyo 108-8345, Japan;
| | - Toshiro Sato
- Department of Gastroenterology, Keio University School of Medicine, Tokyo 108-8345, Japan;
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129
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El-Salhy M, Hatlebakk JG, Hausken T. Reduction in duodenal endocrine cells in irritable bowel syndrome is associated with stem cell abnormalities. World J Gastroenterol 2015; 21:9577-9587. [PMID: 26327765 PMCID: PMC4548118 DOI: 10.3748/wjg.v21.i32.9577] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 02/09/2015] [Accepted: 04/03/2015] [Indexed: 02/06/2023] Open
Abstract
AIM: To determine whether the decreased density of duodenal endocrine cells in irritable bowel syndrome (IBS) is associated with abnormalities in stem cell differentiation.
METHODS: The study sample comprised 203 patients with IBS (180 females and 23 males with a mean age of 36 years) and a control group of 86 healthy subjects without gastrointestinal complaints (77 females and 9 males with a mean age of 38 years). The patients included 80 with mostly diarrhoea (IBS-D), 47 with both diarrhoea and constipation (IBS-M), and 76 with mostly constipation (IBS-C). Both the patients and controls underwent gastroscopy and four biopsy samples were taken from the descending part of the duodenum, proximal to the papilla of Vater. The biopsy samples were sectioned and immunostained for Musashi 1 (Msi-1), neurogenin 3 (NEUROG3), secretin, cholecystokinin (CCK), gastric inhibitory peptide (GIP), somatostatin and serotonin. Immunostaining was performed with an ultraView Universal DAB Detection Kit (v1.02.0018, Venata Medical Systems, Basal, Switzerland) using the BenchMark Ultra immunohistochemistry/in situ hybridization staining module (Venata Medical Systems). Endocrine cell densities were quantified by computerized image analysis using the Olympus cellSens imaging program.
RESULTS: The densities of Msi-1 and NEUROG3 cells were significantly lower in IBS patients, regardless of the subtype, than in the controls (77 ± 17 vs 8 ± 2; P = 0.0001, and 351 ± 33 vs 103 ± 22; P = 0.00002, respectively). Furthermore, the densities of secretin, and CCK cells were significantly lower in patients with diarrhoea as the predominant IBS symptom (IBS-D) than in the controls (161 ± 11 vs 88 ± 8; P = 0.00007, and 325 ± 41 vs 118 ± 10; P = 0.00006, respectively), but not in patients with constipation as the predominant IBS symptom (IBS-C) or those with both diarrhoea and constipation (IBS-M). The GIP cell density was significantly reduced in both IBS-D (152 ± 12 vs 82 ± 7; P = 0.00003), and IBS-C (152 ± 12 vs 107 ± 8; P = 0.01), but not in IBS-M. The densities of somatostatin cells in the controls and the IBS-total, IBS-D, IBS-M and IBS-C patients were 81 ± 8, 28 ± 3, 20 ± 4, 37 ± 5 and 28 ± 4 cells/mm2 epithelium, respectively. The density of somatostatin cells was lower in IBS-total, IBS-D, IBS-M and IBS-C patients than in the controls (P = 0.00009, 0.00006, 0.009 and 0.00008, respectively). The density of serotonin cells did not differ between IBS patients and controls.
CONCLUSION: The reduction in duodenal endocrine cells in IBS patients found in this study is probably attributable to the reduction in cells expressing Msi-1 and NEUROG3.
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130
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Demitrack ES, Gifford GB, Keeley TM, Carulli AJ, VanDussen KL, Thomas D, Giordano TJ, Liu Z, Kopan R, Samuelson LC. Notch signaling regulates gastric antral LGR5 stem cell function. EMBO J 2015; 34:2522-36. [PMID: 26271103 DOI: 10.15252/embj.201490583] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 07/16/2015] [Indexed: 01/10/2023] Open
Abstract
The major signaling pathways regulating gastric stem cells are unknown. Here we report that Notch signaling is essential for homeostasis of LGR5(+) antral stem cells. Pathway inhibition reduced proliferation of gastric stem and progenitor cells, while activation increased proliferation. Notch dysregulation also altered differentiation, with inhibition inducing mucous and endocrine cell differentiation while activation reduced differentiation. Analysis of gastric organoids demonstrated that Notch signaling was intrinsic to the epithelium and regulated growth. Furthermore, in vivo Notch manipulation affected the efficiency of organoid initiation from glands and single Lgr5-GFP stem cells, suggesting regulation of stem cell function. Strikingly, constitutive Notch activation in LGR5(+) stem cells induced tissue expansion via antral gland fission. Lineage tracing using a multi-colored reporter demonstrated that Notch-activated stem cells rapidly generate monoclonal glands, suggesting a competitive advantage over unmanipulated stem cells. Notch activation was associated with increased mTOR signaling, and mTORC1 inhibition normalized NICD-induced increases in proliferation and gland fission. Chronic Notch activation induced undifferentiated, hyper-proliferative polyps, suggesting that aberrant activation of Notch in gastric stem cells may contribute to gastric tumorigenesis.
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Affiliation(s)
- Elise S Demitrack
- Department of Molecular & Integrative Physiology, The University of Michigan Medical School, Ann Arbor, MI, USA
| | - Gail B Gifford
- Department of Molecular & Integrative Physiology, The University of Michigan Medical School, Ann Arbor, MI, USA
| | - Theresa M Keeley
- Department of Molecular & Integrative Physiology, The University of Michigan Medical School, Ann Arbor, MI, USA
| | - Alexis J Carulli
- Department of Molecular & Integrative Physiology, The University of Michigan Medical School, Ann Arbor, MI, USA
| | - Kelli L VanDussen
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA
| | - Dafydd Thomas
- Department of Pathology, The University of Michigan Medical School, Ann Arbor, MI, USA
| | - Thomas J Giordano
- Department of Pathology, The University of Michigan Medical School, Ann Arbor, MI, USA Department of Internal Medicine, The University of Michigan Medical School, Ann Arbor, MI, USA
| | - Zhenyi Liu
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA
| | - Raphael Kopan
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Linda C Samuelson
- Department of Molecular & Integrative Physiology, The University of Michigan Medical School, Ann Arbor, MI, USA Department of Internal Medicine, The University of Michigan Medical School, Ann Arbor, MI, USA
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131
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Abstract
Liver cancer is an extraordinarily heterogeneous malignant disease among the tumors that have so far been identified. Hepatocellular carcinoma (HCC) arises most frequently in the setting of chronic liver inflammation and fibrosis, and takes a variety of course in individual patients to process to tumor. The risk factors such as HBV and/or HCV infections, aflatoxin infection, abuse alcohol intake, metabolic syndrome, obesity and diabetes are closely related to the environmental and genetic susceptibilities to HCC. The consequent resulting genomic instability, molecular and signal transduction network disorders and microenvironmental discrepancies are characterized by the extraordinary heterogeneity of liver cancer. The histology-based definition of the morphological heterogeneity of liver cancer has been modified and refined to treat patients with targeted therapies, but this still cannot solve all the problems. Lack of consistent outcome for anticancer agents and conventional therapies in liver cancer treatment calls for assessing the benefits of new molecularly targeted drugs and combined therapy, under the heterogeneity condition of tumor. The present review article will provide the complex mechanism and phenotype of liver cancer heterogeneity, and help us to execute precision medicine in a really personalized manner.
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Affiliation(s)
- Liang Li
- International Co-operation Laboratory on Signal Transduction, Eastern Hepatobiliary Surgery Institute, Second Military Medical University, Shanghai 200438, China; National Center for Liver Cancer, Shanghai, China
| | - Hongyang Wang
- International Co-operation Laboratory on Signal Transduction, Eastern Hepatobiliary Surgery Institute, Second Military Medical University, Shanghai 200438, China; National Center for Liver Cancer, Shanghai, China; National Laboratory for Oncogenes and Related Genes, Cancer Institute, RenJi Hospital, Shanghai Jiao Tong University, Shanghai 200441, China.
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132
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Li Q, Li Y, Gu B, Fang L, Zhou P, Bao S, Huang L, Dai X. Akt Phosphorylates Wnt Coactivator and Chromatin Effector Pygo2 at Serine 48 to Antagonize Its Ubiquitin/Proteasome-mediated Degradation. J Biol Chem 2015; 290:21553-67. [PMID: 26170450 DOI: 10.1074/jbc.m115.639419] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Indexed: 01/16/2023] Open
Abstract
Pygopus 2 (Pygo2/PYGO2) is an evolutionarily conserved coactivator and chromatin effector in the Wnt/β-catenin signaling pathway that regulates cell growth and differentiation in various normal and malignant tissues. Although PYGO2 is highly overexpressed in a number of human cancers, the molecular mechanism underlying its deregulation is largely unknown. Here we report that Pygo2 protein is degraded through the ubiquitin/proteasome pathway and is posttranslationally stabilized through phosphorylation by activated phosphatidylinositol 3-kinase/Akt signaling. Specifically, Pygo2 is stabilized upon inhibition of the proteasome, and its intracellular level is regulated by Cullin 4 (Cul4) and DNA damage-binding protein 1 (DDB1), components of the Cul4-DDB1 E3 ubiquitin ligase complex. Furthermore, Pygo2 is phosphorylated at multiple residues, and Akt-mediated phosphorylation at serine 48 leads to its decreased ubiquitylation and increased stability. Finally, we provide evidence that Akt and its upstream growth factors act in parallel with Wnt to stabilize Pygo2. Taken together, our findings highlight chromatin regulator Pygo2 as a common node downstream of oncogenic Wnt and Akt signaling pathways and underscore posttranslational modification, particularly phosphorylation and ubiquitylation, as a significant mode of regulation of Pygo2 protein expression.
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Affiliation(s)
- Qiuling Li
- From the Department of Biological Chemistry, the State Key Laboratory of Molecular and Developmental Biology, Center for Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China, and
| | - Yuewei Li
- the Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, New York 10065
| | - Bingnan Gu
- From the Department of Biological Chemistry
| | - Lei Fang
- Department of Physiology and Biophysics, School of Medicine, University of California, Irvine, California 92697
| | - Pengbo Zhou
- the Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, New York 10065
| | - Shilai Bao
- the State Key Laboratory of Molecular and Developmental Biology, Center for Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China, and
| | - Lan Huang
- Department of Physiology and Biophysics, School of Medicine, University of California, Irvine, California 92697,
| | - Xing Dai
- From the Department of Biological Chemistry,
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133
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A Transition Zone Showing Highly Discontinuous or Alternating Levels of Stem Cell and Proliferation Markers Characterizes the Development of PTEN-Haploinsufficient Colorectal Cancer. PLoS One 2015; 10:e0131108. [PMID: 26098881 PMCID: PMC4476594 DOI: 10.1371/journal.pone.0131108] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 05/28/2015] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Stepwise acquisition of oncogene mutations and deletion/inactivation of tumor suppressor genes characterize the development of colorectal cancer (CRC). These genetic events interact with discrete morphologic transitions from hyperplastic mucosa to adenomatous areas, followed by in situ malignant transformation and finally invasive carcinoma. The goal of this study was to identify tissue markers of the adenoma-carcinoma morphogenetic transitions in CRC. METHODS AND FINDINGS We analyzed the patterns of expression of growth regulatory and stem cell markers across these distinct morphologic transition zones in 735 primary CRC tumors. In 202 cases with preserved adenoma-adenocarcinoma transition, we identified, in 37.1% of cases, a zone of adenomatous epithelium, located immediately adjacent to the invasive component, that showed rapidly alternating intraglandular stretches of PTEN+ and PTEN- epithelium. This zone exactly overlapped with similar alternating expression of Ki-67 and inversely with the transforming growth factor-beta (TGF-β) growth regulator SMAD4. These zones also show parallel alternating levels and/or subcellular localization of multiple cancer stem/progenitor cell (CSC) markers, including β-catenin/CTNNB1, ALDH1, and CD44. PTEN was always re-expressed in the invasive tumor in these cases, unlike those with complete loss of PTEN expression. Genomic microarray analysis of CRC with prominent CSC-like expansions demonstrated a high frequency of PTEN genomic deletion/haploinsufficiency in tumors with CSC-like transition zones (62.5%) but not in tumors with downregulated but non-alternating PTEN expression (14.3%). There were no significant differences in the levels of KRAS mutation or CTNNB1 mutation in CSC-like tumors as compared to unselected CRC cases. CONCLUSIONS In conclusion, we have identified a distinctive CSC-like pre-invasive transition zone in PTEN-haploinsufficient CRC that shows convergent on-off regulation of the PTEN/AKT, TGF-β/SMAD and Wnt/β-catenin pathways. This bottleneck-like zone is usually followed by the emergence of invasive tumors with intact PTEN expression but dysregulated TP53 and uniformly high proliferation rates.
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134
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Zhao B, Qi Z, Li Y, Wang C, Fu W, Chen YG. The non-muscle-myosin-II heavy chain Myh9 mediates colitis-induced epithelium injury by restricting Lgr5+ stem cells. Nat Commun 2015; 6:7166. [PMID: 25968904 DOI: 10.1038/ncomms8166] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 04/13/2015] [Indexed: 11/09/2022] Open
Abstract
Lgr5+ stem cells are crucial to gut epithelium homeostasis, and therapies targeting these cells hold promise for treatment of gastrointestinal diseases. Here we report that the non-muscle-myosin-II (NMII) heavy chain Myh9 accumulates at epithelial injury sites in mice distal colon treated with dextran sulphate sodium (DSS). Gut-epithelium-specific Myh9 monoallelic deletion alleviates DSS-induced colonic crypt damage and acute colitis. Consistently, the NMII inhibitor blebbistatin can improve the survival of Lgr5+ stem cells and the growth of Lgr5 organoids. Mechanistically, inhibition of NMII by blebbistatin or Myh9 monoallelic deletion activates Akt through Rac1 and PAK1, which is essential for the survival and pluripotency of Lgr5+ cells. These results establish a critical role of the Myh9-Rac1-PAK1-Akt pathway in the maintenance of Lgr5+ stem cells. As blebbistatin can mitigate DSS-induced colitis and preserve Lgr5+ colonic stem cells in vivo, our findings provide a potential therapeutic intervention of gastrointestinal epithelium injury and degenerative diseases.
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Affiliation(s)
- Bing Zhao
- The State Key Laboratory of Biomembrane and Membrane Biotechnology, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Zhen Qi
- The State Key Laboratory of Biomembrane and Membrane Biotechnology, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Yehua Li
- The State Key Laboratory of Biomembrane and Membrane Biotechnology, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Chongkai Wang
- Department of General Surgery, Peking University Third Hospital, Beijing 100191, China
| | - Wei Fu
- Department of General Surgery, Peking University Third Hospital, Beijing 100191, China
| | - Ye-Guang Chen
- The State Key Laboratory of Biomembrane and Membrane Biotechnology, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China
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135
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Huang X, Li D, Li T, Zhao BO, Chen X. Prognostic value of the expression of phosphatase and tensin homolog and CD44 in elderly patients with refractory acute myeloid leukemia. Oncol Lett 2015; 10:103-110. [PMID: 26170984 DOI: 10.3892/ol.2015.3189] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Accepted: 04/09/2015] [Indexed: 01/18/2023] Open
Abstract
The leukemic stem cell marker CD44, has been reported to have prognostic significance in hematological malignancies. The present study therefore aimed to evaluate whether the expression levels of CD44 and the associated pathway components are associated with the survival rate of elderly patients with refractory acute myeloid leukemia (AML). A total of 20 elderly patients diagnosed with refractory AML were divided into two groups, following induction chemotherapy: Complete remission (CR, n=9) and non-remission (NR. n=11). Bone marrow biopsy specimens were collected, expression levels of CD44, phosphatase and tensin homolog (PTEN), mammalian target of rapamycin (mTOR) and nuclear factor-κB (NF-κB) were analyzed by immunohistochemistry and the captured images were analyzed in a blinded manner using Image Pro Plus software, version 6.0. The overall survival rates (OS) of the patients were then analyzed with log rank, and the correlation between CD44, PTEN, mTOR and NF-κB expression levels and patients survival rates were statistically analyzed using Pearson's method. Significant differences were observed between the CR and NR groups for PTEN (P=0.025) and CD44 (P=0.020) expression levels. Positive CD44 expression was significantly correlated with poor overall survival, with a hazard ratio of 6.281 (95% CI, 1.78-22.12; P=0.0042). The mean OS was 4.00 months for patients that demonstrated positive CD44 expression, compared with 9.27 months for patients that demonstrated negative CD44 expression. A tendency towards reduced survival rates was also observed in patients negative for PTEN expression, when compared with that of PTEN-positive patients. The mean OS was 4.81 months in PTEN-negative patients vs. 8.8 months in PTEN-positive patients, with a hazard ratio of 2.689 (95%CI, 0.89-8.08; P=0.078). Patients that exhibited PTEN-positive and CD44-negative expression, survived significantly longer than patients that demonstrated PTEN-negative and CD44-positive expression (mean OS, 9.86 vs 2.67 months; hazard ratio=0.037; 95% CI, 0.006-0.222, P=0.0006). The expression levels of NF-κB and mTOR were slightly increased in the NR group compared with those of the CR group, although no significant differences were identified. PTEN and CD44 expression levels demonstrated trends towards negative correlation. In conclusion, the expression levels of CD44 and PTEN may be useful markers to predict the prognosis of elderly patients with refractory AML.
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Affiliation(s)
- Xiao Huang
- Department of Oncology and Hematology, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing 100700, P.R. China
| | - Dongyun Li
- Department of Oncology and Hematology, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing 100700, P.R. China
| | - Tiantian Li
- Department of Oncology and Hematology, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing 100700, P.R. China
| | - B O Zhao
- Department of Biostatistics, The University of Texas, Houston Health Science Center, Houston, TX 77030, USA
| | - Xinyi Chen
- Department of Oncology and Hematology, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing 100700, P.R. China
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136
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Miyamoto Y, Sakane F, Hashimoto K. N-cadherin-based adherens junction regulates the maintenance, proliferation, and differentiation of neural progenitor cells during development. Cell Adh Migr 2015; 9:183-92. [PMID: 25869655 DOI: 10.1080/19336918.2015.1005466] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
This review addresses our current understanding of the regulatory mechanism by which N-cadherin, a classical cadherin, affects neural progenitor cells (NPCs) during development. N-cadherin is responsible for the integrity of adherens junctions (AJs), which develop in the sub-apical region of NPCs in the neural tube and brain cortex. The apical domain, which contains the sub-apical region, is involved in the switching from symmetric proliferative division to asymmetric neurogenic division of NPCs. In addition, N-cadherin-based AJ is deeply involved in the apico-basal polarity of NPCs and the regulation of Wnt-β-catenin, hedgehog (Hh), and Notch signaling. In this review, we discuss the roles of N-cadherin in the maintenance, proliferation, and differentiation of NPCs through components of AJ, β-catenin and αE-catenin.
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Key Words
- AJ, adherens junction
- EC, extracellular
- Fox, forkhead box
- Frz, frizzled
- GFAP, glial fibrillary acidic protein
- GSK3β, glycogen synthase kinase 3β
- Hes, hairly/enhancer of split
- Hh, hedgehog
- IP, intermediate progenitor
- KO, knockout
- LEF, lymphocyte enhancer factor
- N-cadherin
- NPC, neural progenitor cell
- Par, partition defective complex protein
- Ptc, Pached
- Smo, smoothened
- Sox2, sry (sex determining region Y)-box containing gene 2
- TA cell, transient amplifying cell; ZO-1, Zonula Occludens-1.
- TCF, T-cell factor
- aPKC, atypical protein kinase C
- adherens junction
- apico-basal polarity
- iPSC, induced pluripotent stem cell
- neural progenitor cells
- ngn2, neurogenin 2
- shRNA, short hairpin RNA
- β-catenin
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Affiliation(s)
- Yasunori Miyamoto
- a The Graduate School of Humanities and Sciences; Ochanomizu University ; Tokyo , Japan
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137
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Hayakawa Y, Jin G, Wang H, Chen X, Westphalen CB, Asfaha S, Renz BW, Ariyama H, Dubeykovskaya ZA, Takemoto Y, Lee Y, Muley A, Tailor Y, Chen D, Muthupalani S, Fox JG, Shulkes A, Worthley DL, Takaishi S, Wang TC. CCK2R identifies and regulates gastric antral stem cell states and carcinogenesis. Gut 2015; 64:544-53. [PMID: 24951258 PMCID: PMC4627594 DOI: 10.1136/gutjnl-2014-307190] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Progastrin is the incompletely cleaved precursor of gastrin that is secreted by G-cells in the gastric antrum. Both gastrin and progastrin bind to the CCK2 receptor (Cckbr or CCK2R) expressed on a subset of gastric epithelial cells. Little is known about how gastrin peptides and CCK2R regulate gastric stem cells and carcinogenesis. Interconversion among progenitors in the intestine is documented, but the mechanisms by which this occurs are poorly defined. DESIGN We generated CCK2R-CreERT mice and performed inducible lineage tracing experiments. CCK2R+ antral cells and Lgr5+ antral stem cells were cultured in a three-dimensional in vitro system. We crossed progastrin-overexpressing mice with Lgr5-GFP-CreERT mice and examined the role of progastrin and CCK2R in Lgr5+ stem cells during MNU-induced carcinogenesis. RESULTS Through lineage tracing experiments, we found that CCK2R defines antral stem cells at position +4, which overlapped with an Lgr5(neg or low) cell population but was distinct from typical antral Lgr5(high) stem cells. Treatment with progastrin interconverts Lgr5(neg or low) CCK2R+ cells into Lgr5(high) cells, increases CCK2R+ cell numbers and promotes gland fission and carcinogenesis in response to the chemical carcinogen MNU. Pharmacological inhibition or genetic ablation of CCK2R attenuated progastrin-dependent stem cell expansion and carcinogenesis. CONCLUSIONS CCK2R labels +4 antral stem cells that can be activated and expanded by progastrin, thus identifying one hormonal trigger for gastric stem cell interconversion and a potential target for gastric cancer chemoprevention and therapy.
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Affiliation(s)
- Yoku Hayakawa
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Guangchun Jin
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Hongshan Wang
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Xiaowei Chen
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Christoph B Westphalen
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA,Department of Internal Medicine III, Klinikum der Universität München, Munich, Germany
| | - Samuel Asfaha
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Bernhard W Renz
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Hiroshi Ariyama
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Zinaida A Dubeykovskaya
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Yoshihiro Takemoto
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Yoomi Lee
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Ashlesha Muley
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Yagnesh Tailor
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Duan Chen
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
| | - Sureshkumar Muthupalani
- Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - James G Fox
- Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Arthur Shulkes
- Department of Surgery, University of Melbourne, Austin Health, Melbourne, Australia
| | - Daniel L Worthley
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Shigeo Takaishi
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA,Center for Advanced Medical Innovation, Kyushu University, Fukuoka, Japan
| | - Timothy C Wang
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, New York, USA
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138
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Transformation of the intestinal epithelium by the MSI2 RNA-binding protein. Nat Commun 2015; 6:6517. [PMID: 25774828 PMCID: PMC4643281 DOI: 10.1038/ncomms7517] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Accepted: 01/30/2015] [Indexed: 01/26/2023] Open
Abstract
The MSI2 RNA binding protein is a potent oncogene playing key roles in hematopoietic stem cell homeostasis and malignant hematopoiesis. Here we demonstrate that MSI2 is expressed in the intestinal stem cell compartment, that its expression is elevated in colorectal adenocarcinomas, and that MSI2 loss of function abrogates colorectal cancer cell growth. MSI2 gain of function in the intestinal epithelium in a drug inducible mouse model is sufficient to phenocopy many of the morphological and molecular consequences of acute loss of the APC tumor suppressor in the intestinal epithelium in a Wnt-independent manner. Transcriptome-wide RNA-binding analysis indicates that MSI2 acts as a pleiotropic inhibitor of known intestinal tumor suppressors including Lrig1, Bmpr1a, Cdkn1a, and Pten. Finally, we demonstrate that inhibition of the PDK-AKT-mTORC1 axis rescues oncogenic consequences of MSI2 induction. Taken together, our findings identify MSI2 as a central component in an unappreciated oncogenic pathway promoting intestinal transformation.
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139
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Kim NH, Jung HI, Choi WS, Son BW, Seo YB, Choi JS, Kim GD. Toluhydroquinone, the secondary metabolite of marine algae symbiotic microorganism, inhibits angiogenesis in HUVECs. Biomed Pharmacother 2015; 70:129-39. [DOI: 10.1016/j.biopha.2015.01.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 01/04/2015] [Indexed: 01/08/2023] Open
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140
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Luo W, Zhao X, Jin H, Tao L, Zhu J, Wang H, Hemmings BA, Yang Z. Akt1 signaling coordinates BMP signaling and β-catenin activity to regulate second heart field progenitor development. Development 2015; 142:732-42. [DOI: 10.1242/dev.119016] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Second heart field (SHF) progenitors exhibit continued proliferation and delayed differentiation, which are modulated by FGF4/8/10, BMP and canonical Wnt/β-catenin signaling. PTEN-Akt signaling regulates the stem cell/progenitor cell homeostasis in several systems, such as hematopoietic stem cells, intestinal stem cells and neural progenitor cells. To address whether PTEN-Akt signaling is involved in regulating cardiac progenitors, we deleted Pten in SHF progenitors. Deletion of Pten caused SHF expansion and increased the size of the SHF derivatives, the right ventricle and the outflow tract. Cell proliferation of cardiac progenitors was enhanced, whereas cardiac differentiation was unaffected by Pten deletion. Removal of Akt1 rescued the phenotype and early lethality of Pten deletion mice, suggesting that Akt1 was the key downstream target that was negatively regulated by PTEN in cardiac progenitors. Furthermore, we found that inhibition of FOXO by Akt1 suppressed the expression of the gene encoding the BMP ligand (BMP7), leading to dampened BMP signaling in the hearts of Pten deletion mice. Cardiac activation of Akt also increased the Ser552 phosphorylation of β-catenin, thus enhancing its activity. Reducing β-catenin levels could partially rescue heart defects of Pten deletion mice. We conclude that Akt signaling regulates the cell proliferation of SHF progenitors through coordination of BMP signaling and β-catenin activity.
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Affiliation(s)
- Wen Luo
- MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, Nanjing 210061, China
| | - Xia Zhao
- MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, Nanjing 210061, China
| | - Hengwei Jin
- MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, Nanjing 210061, China
| | - Lichan Tao
- MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, Nanjing 210061, China
| | - Jingai Zhu
- MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, Nanjing 210061, China
| | - Huijuan Wang
- MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, Nanjing 210061, China
| | - Brian A. Hemmings
- Friedrich Miescher Institute for Biomedical Research, 4058 Basel, Switzerland
| | - Zhongzhou Yang
- MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, Nanjing 210061, China
- Collaborative Innovation Center for Genetics and Development, Institute of Plant Biology, School of Life Sciences, Fudan University, Shanghai 200438, China
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141
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Segrelles C, García-Escudero R, Garín MI, Aranda JF, Hernández P, Ariza JM, Santos M, Paramio JM, Lorz C. Akt signaling leads to stem cell activation and promotes tumor development in epidermis. Stem Cells 2015; 32:1917-28. [PMID: 24504902 DOI: 10.1002/stem.1669] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Accepted: 01/18/2014] [Indexed: 01/25/2023]
Abstract
Hair follicle stem cells (HF-SCs) alternate between periods of quiescence and proliferation, to finally differentiate into all the cell types that constitute the hair follicle. Also, they have been recently identified as cells of origin in skin cancer. HF-SCs localize in a precise region of the hair follicle, the bulge, and molecular markers for this population have been established. Thus, HF-SCs are good model to study the potential role of oncogenic activations on SC physiology. Expression of a permanently active form of Akt (myrAkt) in basal cells leads to Akt hyperactivation specifically in the CD34(+)Itga6(H) population. This activation causes bulge stem cells to exit from quiescence increasing their response to proliferative stimuli and affecting some functions such as cell migration. HF-SC identity upon Akt activation is preserved; in this sense, increased proliferation does not result in stem cell exhaustion with age suggesting that Akt activation does not affect self-renewal an important aspect for normal tissue maintenance and cancer development. Genome-wide transcriptome analysis of HF-SC isolated from myrAkt and wild-type epidermis underscores changes in metabolic pathways characteristic of cancer cells. These differences manifest during a two-step carcinogenesis protocol in which Akt activation in HF-SCs results in increased tumor development and malignant transformation.
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Affiliation(s)
- Carmen Segrelles
- Molecular Oncology Unit and, Department of Basic Research, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
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142
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Volckaert T, De Langhe SP. Wnt and FGF mediated epithelial-mesenchymal crosstalk during lung development. Dev Dyn 2014; 244:342-66. [PMID: 25470458 DOI: 10.1002/dvdy.24234] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 11/20/2014] [Accepted: 11/26/2014] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND The adaptation to terrestrial life required the development of an organ capable of efficient air-blood gas exchange. To meet the metabolic load of cellular respiration, the mammalian respiratory system has evolved from a relatively simple structure, similar to the two-tube amphibian lung, to a highly complex tree-like system of branched epithelial airways connected to a vast network of gas exchanging units called alveoli. The development of such an elaborate organ in a relatively short time window is therefore an extraordinary feat and involves an intimate crosstalk between mesodermal and endodermal cell lineages. RESULTS This review describes the molecular processes governing lung development with an emphasis on the current knowledge on the role of Wnt and FGF signaling in lung epithelial differentiation. CONCLUSIONS The Wnt and FGF signaling pathways are crucial for the dynamic and reciprocal communication between epithelium and mesenchyme during lung development. In addition, some of this developmental crosstalk is reemployed in the adult lung after injury to drive regeneration, and may, when aberrantly or chronically activated, result in chronic lung diseases. Novel insights into how the Wnt and FGF pathways interact and are integrated into a complex gene regulatory network will not only provide us with essential information about how the lung regenerates itself, but also enhance our understanding of the pathogenesis of chronic lung diseases, as well as improve the controlled differentiation of lung epithelium from pluripotent stem cells.
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Affiliation(s)
- Thomas Volckaert
- Department of Pediatrics, Division of Cell Biology, National Jewish Health, Denver, Colorado; The Inflammation Research Center, Unit of Molecular Signal Transduction in Inflammation, VIB, Technologiepark 927, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Ghent University, Technologiepark 927, 9052 Ghent, Belgium
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Deng XB, Xiao L, Wu Y, Jin F, Mossman B, Testa JR, Xiao GH. Inhibition of mesothelioma cancer stem-like cells with adenovirus-mediated NK4 gene therapy. Int J Cancer 2014; 137:481-90. [PMID: 25501304 DOI: 10.1002/ijc.29391] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 11/24/2014] [Indexed: 02/05/2023]
Abstract
Malignant mesothelioma (MM) is a highly invasive and chemoresistant malignancy induced by asbestos fibers. NK4, a hepatocyte growth factor antagonist and angiogenesis inhibitor, consists of the N-terminal hairpin domain and four kringle domains of the α-chain of hepatocyte growth factor. The therapeutic potential of NK4 has been demonstrated in a variety of tumor types. However, the mechanisms by which NK4 inhibits tumor growth have not been well delineated. In this study, it is shown that the NK4 adenovirus (Ad-NK4) potently inhibits cell viability, invasiveness and tumorigenicity of human MM cells. Significantly, this study demonstrates for the first time that Ad-NK4 inhibits cancer stem-like cell (CSC) properties as assessed by spheroid formation assay, side population analysis and flow cytometric sorting of CD24 cells. In addition to inhibiting phosphorylation of Met and AKT, Ad-NK4 markedly suppressed the active form of β-catenin, a key mediator of both Wnt and AKT pathways. It is further demonstrated that expression of NK4 suppresses β-catenin nuclear localization and transcriptional activity. Intriguingly, the expression levels of Oct4 and Myc, two critical stem cell factors and downstream targets of β-catenin, were also diminished by Ad-NK4. Furthermore, the strong antitumor effect of NK4 was found to be linked to its ability to inhibit CSCs as revealed by immunohistochemical examination of tumor specimens from a mouse xenograft model of human MM. These findings suggest that NK4 acts as a CSC inhibitor by impeding Met/AKT/β-catenin signaling and holds promise for achieving durable therapeutic responses in MM by constraining the CSC component of these aggressive tumors.
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Affiliation(s)
- Xu-Bin Deng
- Cancer Institute, Southern Medical University, Guangzhou, China
| | - Li Xiao
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA
| | - Yue Wu
- Cancer Institute, Southern Medical University, Guangzhou, China
| | - Fang Jin
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA
| | - Brooke Mossman
- Department of Pathology, University of Vermont College of Medicine, Burlington, VT
| | - Joseph R Testa
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA
| | - Guang-Hui Xiao
- Cancer Institute, Southern Medical University, Guangzhou, China.,Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA
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144
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Oncogenic KRAS signalling promotes the Wnt/β-catenin pathway through LRP6 in colorectal cancer. Oncogene 2014; 34:4914-27. [PMID: 25500543 PMCID: PMC4687460 DOI: 10.1038/onc.2014.416] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 11/04/2014] [Accepted: 11/08/2014] [Indexed: 12/14/2022]
Abstract
Aberrant regulation of the Wnt/β-catenin signaling pathway is one of the major causes of colorectal cancer (CRC). Loss-of-function mutations in APC are commonly found in CRC, leading to inappropriate activation of canonical Wnt signaling. Conversely, gain-of-function mutations in KRAS and BRAF genes are detected in up to 60% of CRCs. Whereas KRAS/mitogen-activated protein kinase (MAPK) and canonical Wnt/β-catenin pathways are critical for intestinal tumorigenesis, mechanisms integrating these two important signaling pathways during CRC development are unknown. Results herein demonstrate that transformation of normal intestinal epithelial cells (IECs) by oncogenic forms of KRAS, BRAF or MEK1 was associated with a marked increase in β-catenin/TCF4 and c-MYC promoter transcriptional activities and mRNA levels of c-Myc, Axin2 and Lef1. Notably, expression of a dominant-negative mutant of T-Cell Factor 4 (ΔNTCF4) severely attenuated IEC transformation induced by oncogenic MEK1 and markedly reduced their tumorigenic and metastatic potential in immunocompromised mice. Interestingly, the Frizzled co-receptor LRP6 was phosphorylated in a MEK-dependent manner in transformed IECs and in human CRC cell lines. Expression of LRP6 mutant in which serine/threonine residues in each particular ProlineProlineProlineSerine/ThreonineProline motif were mutated to alanines (LRP6-5A) significantly reduced β-catenin/TCF4 transcriptional activity. Accordingly, MEK inhibition in human CRC cells significantly diminished β-catenin/TCF4 transcriptional activity and c-MYC mRNA and protein levels without affecting β-catenin expression or stability. Lastly, LRP6 phosphorylation was also increased in human colorectal tumors, including adenomas, in comparison with healthy adjacent normal tissues. Our data indicate that oncogenic activation of KRAS/BRAF/MEK signaling stimulates the canonical Wnt/β-catenin pathway, which in turn promotes intestinal tumor growth and invasion. Moreover, LRP6 phosphorylation by ERK1/2 may provide a unique point of convergence between KRAS/MAPK and Wnt/β-catenin signalings during oncogenesis.
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145
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Mikhail S, Zeidan A. Stem cells in gastrointestinal cancers: The road less travelled. World J Stem Cells 2014; 6:606-613. [PMID: 25426257 PMCID: PMC4178260 DOI: 10.4252/wjsc.v6.i5.606] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 08/27/2014] [Accepted: 09/10/2014] [Indexed: 02/06/2023] Open
Abstract
Cancer stem cells (CSC) are thought to be malignant cells that have the capacity to initiate and maintain tumor growth and survival. Studies have described CSC in various gastrointestinal neoplasms such as colon, pancreas and liver and gastroesophageal tumors. The mechanism by which CSC develop remains unclear. Several studies have explored the role of dysregulation of the Wnt/β-catenin, transformation growth factor-beta and hedhog pathways in generation of CSC. In this review, we discuss the various molecular abnormalities that may be related to formation of CSC in gastrointestinal malignancies, strategies to identify CSC and therapeutic strategies that are based on these concepts. Identification and targeting CSC is an intriguing area and may provide a new therapeutic option for patients with cancer including gastrointestinal malignancies. Although great progress has been made, many issues need to be addressed. Precise targeting of CSC will require precise isolation and characterization of those cells. This field is also evolving but further research is needed to identify markers that are specific for CSC. Although the application of this field has not entered the clinic yet, there continues to be significant optimism about its potential utility in overcoming cancer resistance and curing patients with cancer.
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146
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Kim SJ, Chang S, Lee Y, Kim NY, Hwang Y, Min HJ, Yoo KS, Park EH, Kim S, Chung YH, Park YW, Koh SS. A PAUF-neutralizing antibody targets both carcinoma and endothelial cells to impede pancreatic tumor progression and metastasis. Biochem Biophys Res Commun 2014; 454:144-50. [PMID: 25450371 DOI: 10.1016/j.bbrc.2014.10.056] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 10/12/2014] [Indexed: 01/04/2023]
Abstract
Pancreatic adenocarcinoma up-regulated factor (PAUF) is expressed in pancreatic ductal adenocarcinoma (PDAC) and plays an important role in tumor progression and metastasis. Here we evaluate the anti-tumor efficacy of a human monoclonal antibody against PAUF, PMAb83, to provide a therapeutic intervention to treat the disease. PMAb83 reduced tumor growth and distant metastasis in orthotopically xenografted mice of human PDAC cells. PMAb83 treatment retarded proliferation along with weakened aggressiveness traits of the carcinoma cells. AKT/β-catenin signaling played a role in the carcinoma cell proliferation and the treated xenograft tumors exhibited reduced levels of β-catenin and cyclin D1. Moreover PMAb83 abrogated the PAUF-induced angiogenic responses of endothelial cells, reducing the density of CD31(+) vessels in the treated tumors. In combination with gemcitabine, PMAb83 conferred enhanced survival of xenografted mice by about twofold compared to gemcitabine alone. Taken together, our findings show that PMAb83 treatment decreases the aggressiveness of carcinoma cells and suppresses tumor vascularization, which culminates in mitigated tumor growth and metastasis with improved survival in PDAC mouse models.
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Affiliation(s)
- Su Jin Kim
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea; New Drug Development Center, Osong Medical Innovation Foundation, Cheongwon, Chungbuk, South Korea
| | - Suhwan Chang
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea
| | - Yangsoon Lee
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Na Young Kim
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Yeonsil Hwang
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Hye Jin Min
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Kyung-Sook Yoo
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Eun Hye Park
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Seokho Kim
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Young-Hwa Chung
- BK21-plus, Department of Cogno-Mechatronics Engineering, Pusan National University, Busan, South Korea
| | - Young Woo Park
- Aging Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Sang Seok Koh
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea; Department of Biological Sciences, Dong-A University, Busan, South Korea.
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147
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Nava P, Kamekura R, Quirós M, Medina-Contreras O, Hamilton RW, Kolegraff KN, Koch S, Candelario A, Romo-Parra H, Laur O, Hilgarth RS, Denning TL, Parkos CA, Nusrat A. IFNγ-induced suppression of β-catenin signaling: evidence for roles of Akt and 14.3.3ζ. Mol Biol Cell 2014; 25:2894-904. [PMID: 25079689 PMCID: PMC4230580 DOI: 10.1091/mbc.e13-09-0512] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 07/15/2014] [Accepted: 07/18/2014] [Indexed: 01/04/2023] Open
Abstract
The proinflammatory cytokine interferon γ (IFNγ ) influences intestinal epithelial cell (IEC) homeostasis in a biphasic manner by acutely stimulating proliferation that is followed by sustained inhibition of proliferation despite continued mucosal injury. β-Catenin activation has been classically associated with increased IEC proliferation. However, we observed that IFNγ inhibits IEC proliferation despite sustained activation of Akt/β-catenin signaling. Here we show that inhibition of Akt/β-catenin-mediated cell proliferation by IFNγ is associated with the formation of a protein complex containing phosphorylated β-catenin 552 (pβ-cat552) and 14.3.3ζ. Akt1 served as a bimodal switch that promotes or inhibits β-catenin transactivation in response to IFNγ stimulation. IFNγ initially promotes β-catenin transactivation through Akt-dependent C-terminal phosphorylation of β-catenin to promote its association with 14.3.3ζ. Augmented β-catenin transactivation leads to increased Akt1 protein levels, and active Akt1 accumulates in the nucleus, where it phosphorylates 14.3.3ζ to translocate 14.3.3ζ/β-catenin from the nucleus, thereby inhibiting β-catenin transactivation and IEC proliferation. These results outline a dual function of Akt1 that suppresses IEC proliferation during intestinal inflammation.
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Affiliation(s)
- Porfirio Nava
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322 Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Instituto Politécnico Nacional, 07360 Mexico City, Mexico
| | - Ryuta Kamekura
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
| | - Miguel Quirós
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
| | - Oscar Medina-Contreras
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322 Institute for Biomedical Sciences, Georgia State University, Atlanta, GA 30303
| | - Ross W Hamilton
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
| | - Keli N Kolegraff
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
| | - Stefan Koch
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322 Division of Molecular Embryology, German Cancer Research Center, 69120 Heidelberg, Germany
| | - Aurora Candelario
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Instituto Politécnico Nacional, 07360 Mexico City, Mexico
| | - Hector Romo-Parra
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Instituto Politécnico Nacional, 07360 Mexico City, Mexico Institute of Physiology I (Neurophysiology), Westfälische Wilhelms-University Münster, 48149 Münster, Germany
| | - Oskar Laur
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
| | - Roland S Hilgarth
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
| | - Timothy L Denning
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322 Institute for Biomedical Sciences, Georgia State University, Atlanta, GA 30303
| | - Charles A Parkos
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
| | - Asma Nusrat
- Epithelial Pathobiology and Mucosal Inflammation Research Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
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148
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Yu Y, Liang D, Tian Q, Chen X, Jiang B, Chou BK, Hu P, Cheng L, Gao P, Li J, Wang G. Stimulation of somatic cell reprogramming by ERas-Akt-FoxO1 signaling axis. Stem Cells 2014; 32:349-63. [PMID: 23765875 DOI: 10.1002/stem.1447] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Revised: 04/28/2013] [Accepted: 05/15/2013] [Indexed: 12/19/2022]
Abstract
Reprogramming of somatic cells to induced pluripotent stem cells (iPSCs) shares much similarity to the cancer initiation process, and the molecular mechanisms underlying both processes remain to be elucidated. Here, we report that a tumor- or embryonic stem cell-specific Ras gene ERas, which encodes a constitutively active form of GTPase, and its downstream Phosphoinositide-3 kinase/Akt signaling pathway are important facilitators for the somatic reprogramming process. We found that overexpression of ERas retrovirally enhanced mouse iPSC induction while ERas knockdown repressed it. Modulation of Akt signaling by genetic or chemical means greatly impacted the reprogramming efficiency. Forced expression of a constitutively active Akt1 gene could rescue the reduced efficiency resulting from ERas knockdown, and point-mutation analyses further revealed that ERas is tightly coupled with Akt signaling to enhance reprogramming. Mechanistically, the forkhead transcription factor FoxO1 can function as a barrier to the iPSC induction, and the inactivation of FoxO1 by Akt-dependent phosphorylation largely accounts for the enhancing effect of ERas-Akt signaling on reprogramming. Collectively, these results unravel the significance of the ERas-Akt-FoxO1 signaling axis in iPSC generation, suggesting a possibly shared molecular basis for both somatic reprogramming and cancer initiation.
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Affiliation(s)
- Yong Yu
- State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
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149
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Wang SN, Yang SF, Tsai HH, Lee KT, Yeh YT. Increased adiponectin associated with poor survival in hepatocellular carcinoma. J Gastroenterol 2014; 49:1342-51. [PMID: 24132578 DOI: 10.1007/s00535-013-0898-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Accepted: 10/03/2013] [Indexed: 02/04/2023]
Abstract
BACKGROUND Alterations of adiponectin (APN), one of the adipokines, have been associated with human cancers. However, the clinical significance and impacts of APN on hepatocellular carcinoma (HCC) remain undetermined. METHODS Using immunohistochemistry, expression patterns of APN were semiquantitatively scored and further statistically correlated with clinicopathological characteristics and patient survival. Furthermore, the bioeffects and underlying mechanisms of ectopic APN overexpression were determined in Hep3B and HepG2 cells by XTT, immunoblotting, flowcytometry, and invasion assays with or without chemical inhibitors and neutralization antibody. RESULTS We found that cytoplasmic APN staining in 85 cancerous lesions was increased and associated with a poor survival rate (P = 0.007), even when using the Cox regression model (OR = 3.590; 95 % CI = 1.240-10.394; P = 0.018). Ectopic overexpression of APN in Hep3B and HepG2 cells increased proliferation and invasion as well as the levels of p-AKT (Ser473), p-STAT3 (Tyr705), and those downstream, i.e., cyclin D1 and β-catenin. Similar results were also demonstrated in a stable APN-overexpressing clone, HepG2#136. APN neutralization antibody and LY294002 blocked the APN-mediated effects via inhibition of activated AKT. CONCLUSIONS Our results suggest that increased APN may contribute to HCC at least in part through its activation of AKT signalling and may serve as a prognostic factor in HCC.
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Affiliation(s)
- Shen-Nien Wang
- Department of Surgery, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, No. 100, Ziyou 1st Rd., Sanmin Dist., Kaohsiung, 80756, Taiwan, ROC
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150
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Im E, Jung J, Pothoulakis C, Rhee SH. Disruption of Pten speeds onset and increases severity of spontaneous colitis in Il10(-/-) mice. Gastroenterology 2014; 147:667-679.e10. [PMID: 24882466 PMCID: PMC4143453 DOI: 10.1053/j.gastro.2014.05.034] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/11/2014] [Accepted: 05/17/2014] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS Early-onset ulcerative colitis, which is considered severe colonic inflammation that develops in infants and young children, can be caused by alterations in interleukin (IL)-10 signaling, although other factors are involved in its pathogenesis. We investigated whether loss of phosphatase and tensin homologue (PTEN), which regulates many important cell functions such as cell proliferation, cell survival, and Toll-like receptor (TLR) signaling pathways, contributes to the development of colitis in Il10(-/-) mice. METHODS We generated Il10(-/-) mice (in C57BL/6 and C3H/HeJBir background strains) with disruption of Pten in the intestinal epithelium (Ints(ΔPten/ΔPten);Il10(-/-) mice) and Ints(ΔCont);Il10(-/-) (control) mice. Colon tissues were collected and histological, transmission electron microscopy, and gene expression analysis were performed. Fecal microbiota samples were analyzed by sequencing of 16S ribosomal RNA genes. We disrupted Tlr4 in Ints(ΔPten/ΔPten);Il10(-/-) mice. Lipopolysaccharide signaling via TLR4 was blocked by treating mice with polymyxin B. RESULTS Il10(-/-) mice developed colitis when they were 6 to 7 months old, whereas Ints(ΔPten/ΔPten);Il10(-/-) mice developed severe colitis and colon tumors by the time they were 36 days old. Within 3 months of birth, 80% of Ints(ΔPten/ΔPten);Il10(-/-) mice developed severe colitis and colonic malignancy, whereas none of the Ints(ΔCont);Il10(-/-) mice had these phenotypes. Ints(ΔPten/ΔPten);Il10(-/-) mice had alterations in fecal microbiota compared with controls, such as increased proportions of Bacteroides species, which are gram negative. Disruption of Tlr4 or treating Ints(ΔPten/ΔPten);Il10(-/-) mice with polymyxin B delayed the development of colitis and reduced disease severity. CONCLUSIONS Disruption of Pten in the intestinal epithelium of Il10(-/-) mice speeds the onset and increases the severity of colitis. Fecal microbiota from Ints(ΔPten/ΔPten);Il10(-/-) mice have increased proportions of Bacteroides species. Development of colitis is delayed and reduced by blocking TLR4 signaling. Ints(ΔPten/ΔPten);Il10(-/-) mice may be studied as a model for early-onset ulcerative colitis and used to identify new therapeutic targets.
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Affiliation(s)
- Eunok Im
- College of Pharmacy, Pusan National University, Busan, 609-735, Korea
| | - Jane Jung
- MRL1240, 675 Charles E. Young Drive South, Division of Digestive Diseases, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA, 90095, USA
| | - Charalabos Pothoulakis
- MRL1240, 675 Charles E. Young Drive South, Division of Digestive Diseases, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA, 90095, USA
| | - Sang Hoon Rhee
- Division of Digestive Diseases, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California.
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