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Sakata N, Yoshimatsu G, Kawakami R, Nakano K, Yamada T, Yamamura A, Nagashima H, Kodama S. The porcine islet-derived organoid showed the characteristics as pancreatic duct. Sci Rep 2024; 14:6401. [PMID: 38493252 PMCID: PMC10944495 DOI: 10.1038/s41598-024-57059-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 03/14/2024] [Indexed: 03/18/2024] Open
Abstract
Organoid is a tissue-engineered organ-like structure that resemble as an organ. Porcine islet-derived organoid might be used as an alternative donor of porcine islet xenotransplantation, a promising therapy for severe diabetes. In this study, we elucidated the characteristics of porcine islet organoids derived from porcine islets as a cell source for transplantation. Isolated porcine islets were 3D-cultured using growth factor-reduced matrigel in organoid culture medium consist of advanced DMEM/F12 with Wnt-3A, R-spondin, EGF, Noggin, IGF-1, bFGF, nicotinamide, B27, and some small molecules. Morphological and functional characteristics of islet organoids were evaluated in comparison with 2D-cultured islets in advanced DMEM/F12 medium. Relatively short-term (approximately 14 days)-cultured porcine islet organoids were enlarged and proliferated, but had an attenuated insulin-releasing function. Long-term (over a month)-cultured islet organoids could be passaged and cryopreserved. However, they showed pancreatic duct characteristics, including cystic induction, strong expression of Sox9, loss of PDX1 expression, and no insulin-releasing function. These findings were seen in long-term-cultured porcine islets. In conclusion, our porcine islet organoids showed the characteristics of pancreatic ducts. Further study is necessary for producing porcine islet-derived organoids having characteristics as islets.
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Affiliation(s)
- Naoaki Sakata
- Department of Regenerative Medicine and Transplantation, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan, Fukuoka, Fukuoka, 814-0180, Japan.
- Center for Regenerative Medicine, Fukuoka University Hospital, 7-45-1 Nanakuma, Jonan, Fukuoka, Fukuoka, 814-0180, Japan.
| | - Gumpei Yoshimatsu
- Department of Regenerative Medicine and Transplantation, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan, Fukuoka, Fukuoka, 814-0180, Japan
- Center for Regenerative Medicine, Fukuoka University Hospital, 7-45-1 Nanakuma, Jonan, Fukuoka, Fukuoka, 814-0180, Japan
| | - Ryo Kawakami
- Department of Regenerative Medicine and Transplantation, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan, Fukuoka, Fukuoka, 814-0180, Japan
- Center for Regenerative Medicine, Fukuoka University Hospital, 7-45-1 Nanakuma, Jonan, Fukuoka, Fukuoka, 814-0180, Japan
| | - Kazuaki Nakano
- Meiji University International Institute for Bio-Resource Research, 1-1-1 Higashimita, Tama, Kawasaki, Kanagawa, 214-8571, Japan
| | - Teppei Yamada
- Department of Regenerative Medicine and Transplantation, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan, Fukuoka, Fukuoka, 814-0180, Japan
- Center for Regenerative Medicine, Fukuoka University Hospital, 7-45-1 Nanakuma, Jonan, Fukuoka, Fukuoka, 814-0180, Japan
| | - Akihiro Yamamura
- Department of Surgery, Tohoku University Graduate School of Medicine, 1-1 Seiryomachi, Aoba, Sendai, Miyagi, 980-0872, Japan
| | - Hiroshi Nagashima
- Meiji University International Institute for Bio-Resource Research, 1-1-1 Higashimita, Tama, Kawasaki, Kanagawa, 214-8571, Japan
| | - Shohta Kodama
- Department of Regenerative Medicine and Transplantation, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan, Fukuoka, Fukuoka, 814-0180, Japan
- Center for Regenerative Medicine, Fukuoka University Hospital, 7-45-1 Nanakuma, Jonan, Fukuoka, Fukuoka, 814-0180, Japan
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Kato H, Miwa T, Quijano J, Medrano L, Ortiz J, Desantis A, Omori K, Wada A, Tatsukoshi K, Kandeel F, Mullen Y, Ku HT, Komatsu H. Microwell culture platform maintains viability and mass of human pancreatic islets. Front Endocrinol (Lausanne) 2022; 13:1015063. [PMID: 36465665 PMCID: PMC9712283 DOI: 10.3389/fendo.2022.1015063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 11/02/2022] [Indexed: 11/18/2022] Open
Abstract
Background Transplantation of the human pancreatic islets is a promising approach for specific types of diabetes to improve glycemic control. Although effective, there are several issues that limit the clinical expansion of this treatment, including difficulty in maintaining the quality and quantity of isolated human islets prior to transplantation. During the culture, we frequently observe the multiple islets fusing together into large constructs, in which hypoxia-induced cell damage significantly reduces their viability and mass. In this study, we introduce the microwell platform optimized for the human islets to prevent unsolicited fusion, thus maintaining their viability and mass in long-term cultures. Method Human islets are heterogeneous in size; therefore, two different-sized microwells were prepared in a 35 mm-dish format: 140 µm × 300 µm-microwells for <160 µm-islets and 200 µm × 370 µm-microwells for >160 µm-islets. Human islets (2,000 islet equivalent) were filtered through a 160 µm-mesh to prepare two size categories for subsequent two week-cultures in each microwell dish. Conventional flat-bottomed 35 mm-dishes were used for non-filtered islets (2,000 islet equivalent/2 dishes). Post-cultured islets are collected to combine in each condition (microwells and flat) for the comparisons in viability, islet mass, morphology, function and metabolism. Islets from three donors were independently tested. Results The microwell platform prevented islet fusion during culture compared to conventional flat bottom dishes, which improved human islet viability and mass. Islet viability and mass on the microwells were well-maintained and comparable to those in pre-culture, while flat bottom dishes significantly reduced islet viability and mass in two weeks. Morphology assessed by histology, insulin-secreting function and metabolism by oxygen consumption did not exhibit the statistical significance among the three different conditions. Conclusion Microwell-bottomed dishes maintained viability and mass of human islets for two weeks, which is significantly improved when compared to the conventional flat-bottomed dishes.
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Affiliation(s)
- Hiroyuki Kato
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | | | - Janine Quijano
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Leonard Medrano
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Jose Ortiz
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Akiko Desantis
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Keiko Omori
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Aya Wada
- AGC Techno Glass, Shizuoka, Japan
| | | | - Fouad Kandeel
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Yoko Mullen
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Hsun Teresa Ku
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute of City of Hope, Duarte, CA, United States
| | - Hirotake Komatsu
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute of City of Hope, Duarte, CA, United States
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Jiang T, Wei F, Xie K. Clinical significance of pancreatic ductal metaplasia. J Pathol 2022; 257:125-139. [PMID: 35170758 DOI: 10.1002/path.5883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Revised: 02/06/2022] [Accepted: 02/14/2022] [Indexed: 11/08/2022]
Abstract
Pancreatic ductal metaplasia (PDM) is the stepwise replacement of differentiated somatic cells with ductal or ductal-like cells in the pancreas. PDM is usually triggered by cellular and environmental insults. PDM development may involve all cell lineages of the pancreas, and acinar cells with the highest plasticity are the major source of PDM. Pancreatic progenitor cells are also involved as cells of origin or transitional intermediates. PDM is heterogeneous at the histological, cellular, and molecular levels and only certain subsets of PDM develop further into pancreatic intraepithelial neoplasia (PanIN) and then pancreatic ductal adenocarcinoma (PDAC). The formation and evolution of PDM is regulated at the cellular and molecular levels through a complex network of signaling pathways. The key molecular mechanisms that drive PDM formation and its progression into PanIN/PDAC remain unclear, but represent key targets for reversing or inhibiting PDM. Alternatively, PDM could be a source of pancreas regeneration, including both exocrine and endocrine components. Cellular aging and apoptosis are obstacles to PDM-to-PanIN progression or pancreas regeneration. Functional identification of the cellular and molecular events driving senescence and apoptosis in PDM and its progression would help not only to restrict the development of PDM into PanIN/PDAC, but may also facilitate pancreatic regeneration. This review systematically assesses recent advances in the understanding of PDM physiology and pathology, with a focus on its implications for enhancing regeneration and prevention of cancer. © 2022 The Pathological Society of Great Britain and Ireland.
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Affiliation(s)
- Tingting Jiang
- Center for Pancreatic Cancer Research, The South China University of Technology School of Medicine, Guangzhou, PR China
- Department of Pathology, The South China University of Technology School of Medicine, Guangzhou, PR China
| | - Fang Wei
- Institute of Digestive Diseases Research, The South China University of Technology School of Medicine, Guangzhou, PR China
| | - Keping Xie
- Center for Pancreatic Cancer Research, The South China University of Technology School of Medicine, Guangzhou, PR China
- Department of Pathology, The South China University of Technology School of Medicine, Guangzhou, PR China
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Li X, He J, Xie K. Molecular signaling in pancreatic ductal metaplasia: emerging biomarkers for detection and intervention of early pancreatic cancer. Cell Oncol (Dordr) 2022; 45:201-225. [PMID: 35290607 DOI: 10.1007/s13402-022-00664-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/14/2022] [Indexed: 11/27/2022] Open
Abstract
Pancreatic ductal metaplasia (PDM) is the transformation of potentially various types of cells in the pancreas into ductal or ductal-like cells, which eventually replace the existing differentiated somatic cell type(s). PDM is usually triggered by and manifests its ability to adapt to environmental stimuli and genetic insults. The development of PDM to atypical hyperplasia or dysplasia is an important risk factor for pancreatic intraepithelial neoplasia (PanIN) and pancreatic ductal adenocarcinoma (PDA). Recent studies using genetically engineered mouse models, cell lineage tracing, single-cell sequencing and others have unraveled novel cellular and molecular insights in PDM formation and evolution. Those novel findings help better understand the cellular origins and functional significance of PDM and its regulation at cellular and molecular levels. Given that PDM represents the earliest pathological changes in PDA initiation and development, translational studies are beginning to define PDM-associated cell and molecular biomarkers that can be used to screen and detect early PDA and to enable its effective intervention, thereby truly and significantly reducing the dreadful mortality rate of PDA. This review will describe recent advances in the understanding of PDM biology with a focus on its underlying cellular and molecular mechanisms, and in biomarker discovery with clinical implications for the management of pancreatic regeneration and tumorigenesis.
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Affiliation(s)
- Xiaojia Li
- Center for Pancreatic Cancer Research, The South China University of Technology School of Medicine, Guangzhou, 510006, China
- Department of Pathology, The South China University of Technology School of Medicine, Guangzhou, China
| | - Jie He
- Institute of Digestive Diseases Research, The South China University of Technology School of Medicine, Guangzhou, China
| | - Keping Xie
- Center for Pancreatic Cancer Research, The South China University of Technology School of Medicine, Guangzhou, 510006, China.
- Department of Pathology, The South China University of Technology School of Medicine, Guangzhou, China.
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Li S, Xie K. Ductal metaplasia in pancreas. Biochim Biophys Acta Rev Cancer 2022; 1877:188698. [DOI: 10.1016/j.bbcan.2022.188698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 02/09/2022] [Accepted: 02/09/2022] [Indexed: 02/07/2023]
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Barnett MJ, McGhee-Wilson D, Shapiro AMJ, Lakey JRT. Variation in Human Islet Viability Based on Different Membrane Integrity Stains. Cell Transplant 2017; 13:481-8. [PMID: 15565860 DOI: 10.3727/000000004783983701] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Membrane integrity fluorescent staining is used routinely to evaluate islet viability. Results are used as one of the determining factors in islet product release criteria, and are used to assess the efficacy of different culture conditions. Recently, it has been observed that there is variation in the viability staining of freshly isolated islets based on which viability assay is used. This investigation compares three membrane integrity stains for the viability assessment of isolated human islets. Fluorescein diacetate/propidium iodide (FDA/PI), the current standard method for assessing islet viability, demonstrates intense extracellular fluorescence, reducing the differential staining of intact islets. We further evaluated SYTO-13/ethidium bromide (SYTO/EB) and calcein AM/ethidium homodimer (C/EthD) as alternative viability assays, and found considerable variation between FDA/PI and either SYTO/EB or C/EthD staining. Preparations of human islets were obtained from cadaveric pancreata after collagenase digestion, mechanical separation, and purification by continuous Ficoll gradient centrifugation. For each preparation, two replicate samples of 50 islets were counted for each stain, and the percent viability calculated. The results for SYTO/EB and C/EthD were nearly identical [57.6 ± 7.3% and 57.9 ± 7.2%, respectively (mean ± SEM), N = 11]. FDA/PI-stained islets, however, showed consistently elevated values when compared to SYTO/EB. Accurate assessment of islet viability remains a critical determinant of islet product release. The discrepancies found between FDA/PI scoring and visual quality, compared with alternative stains, suggests that the FDA/PI stain may not be the optimal approach to assess islet viability.
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Affiliation(s)
- M J Barnett
- Clinical Islet Program, University of Alberta, Edmonton, Canada
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Müller SA, Bläuer K, Ergin G, Bergmann F, Z'graggen K, Schmied BM, Ulrich A. Long-term in vitro culture of hamster pancreatic β-cells and induction of adenocarcinoma by treatment with N-nitrosobis(2-oxopropyl)amine. Pancreatology 2012; 12:380-7. [PMID: 22898641 DOI: 10.1016/j.pan.2012.05.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2012] [Revised: 04/26/2012] [Accepted: 05/06/2012] [Indexed: 12/11/2022]
Abstract
OBJECTIVES Earlier studies indicated that hamster pancreatic ductal adenocarcinoma not only derives from ductal/ductular structures but also from cells within the islet. So far unidentified cells within the islet are responsive to the carcinogenic effect of N-nitrosobis (2-oxopropyl) amine (BOP) forming poorly differentiated ductal adenocarcinoma. However, studies indicated a major role of β-cells during carcinogenesis. To find out, if β-cells are the primary target cells of BOP and if they are capable to form ductal adenocarcinoma after malignant transformation, we established a long-term culture of undifferentiated cells deriving from isolated β-cells and treated them with BOP. METHODS Langerhans' islets from pancreata of Syrian golden hamsters were isolated and dispersed into single cells by dispase digestion. Cells were labeled with a highly specific β-cell surface antibody (K14D10) and these K14D10+ cells were extracted from the suspension by paramagnetic Dynabeads. Cells were cultured in vitro and treated with BOP. Untreated cells served as control. RESULTS K14D10+ cells formed a monolayer and produced insulin over a period of 28 days in culture. However, with time in culture they became undifferentiated with a higher proliferation rate and after about 60 days in culture BOP treated cells showed anchorage independent growth. These cells autotransplanted s.c. formed a well-differentiated ductal adenocarcinoma. CONCLUSIONS Pancreatic β-cells are the primary target of BOP without necessarily being embedded in the compound of the Langerhans' islet. With time in culture, they give rise to undifferentiated cells and after malignant transformation they are able to form ductal adenocarcinoma.
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Affiliation(s)
- S A Müller
- Department of Surgery, Kantonsspital St. Gallen, Rorschacherstrasse 95, 9007 St. Gallen, Switzerland
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Abstract
OBJECTIVES In the hamster model, pancreatic ductal adenocarcinoma develops after treatment with N-nitrosobis-(2-oxopropyl)amino (BOP). In this model, Langerhans islets play a central role in carcinogenesis. In contrast, treatment with BOP in rats and mice did not result in cancer development. We investigated whether pancreatic tumors develop after orthotopic implantation of hamster islets into severe combined immunodeficiency mouse pancreases and subsequent treatment with BOP. This occurrence would suggest that pancreatrophic carcinogens are metabolized by islet cells. METHODS Twenty-four severe combined immunodeficiency mice were separated into 2 groups of 12 animals. Five hundred hamster islets were implanted in the splenic lobe of the mouse pancreases in the treatment group, whereas animals of the control group received a sham operation. All animals were treated with BOP for 5 weeks. One year later, the animals were killed and investigated for tumors. RESULTS Carcinomas developed in 3 animals in the treatment group and none in the control group. The tumors displayed the histomorphological phenotype pancreatic ductal adenocarcinoma. CONCLUSIONS Islet cells seem to play a role in pancreatic carcinogenesis in this animal model and therefore represent useful targets for future investigations on the putative role of islet cells during pancreatic ductal adenocarcinoma tumorigenesis.
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Schmied B, Ulrich A, Matsuzaki H, Batra S, Pour P, Schmied B, Ulrich A, Matsuzaki H, Ding X, Adrian T, Ricordi C, Moyer M. Maintenance of human islets in long term culture. Differentiation 2008. [DOI: 10.1111/j.1432-0436.2000.660403.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Hanley S, Rosenberg L. Transforming Growth Factor β Is a Critical Regulator of Adult Human Islet Plasticity. Mol Endocrinol 2007; 21:1467-77. [PMID: 17405902 DOI: 10.1210/me.2007-0045] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
AbstractTissue plasticity is well documented in the context of pancreatic regeneration and carcinogenesis, with recent reports implicating dedifferentiated islet cells both as endocrine progenitors and as the cell(s) of origin in pancreatic adenocarcinoma. Accordingly, it is noteworthy that accumulating evidence suggests that TGFβ signaling is essential to pancreatic endocrine development and maintenance, whereas its loss is associated with the progression to pancreatic adenocarcinoma. The aim of this study was to examine the role of TGFβ in an in vitro model of islet morphogenetic plasticity. Human islets were embedded in a collagen gel and cultured under conditions that induced transformation into duct-like epithelial structures (DLS). Addition of TGFβ caused a dose-dependent decrease in DLS formation. Although it was demonstrated that collagen-embedded islets secrete low levels of TGFβ, antibody-mediated neutralization of this endogenously released TGFβ improved DLS formation rates, suggesting local TGFβ concentrations may in fact be higher. Time course studies indicated that TGFβ signaling was associated with an increase in ERK and p38 MAPK phosphorylation, although inhibitor-based studies were consistent with an islet endocrine-stabilizing effect mediated by p38 alone. Localization of TGFβ signaling molecules suggested that the action of TGFβ is directly on the β-cell to inhibit apoptosis and thus stabilize endocrine phenotype.
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Affiliation(s)
- Stephen Hanley
- Department of Surgery, McGill University, and Centre for Pancreatic Diseases, McGill University Health Centre, Montreal, Quebec, Canada H3G 1A4
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Iki K, Pour PM. Expression of Oct4, a stem cell marker, in the hamster pancreatic cancer model. Pancreatology 2006; 6:406-13. [PMID: 16809941 DOI: 10.1159/000094317] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2005] [Accepted: 12/24/2005] [Indexed: 12/11/2022]
Abstract
BACKGROUND Oct4 has been shown to present a stem cell marker that is expressed in embryonic cells and in germ cell tumors. Recently, its expression in a few human tissues and cancer cells has been reported. Because in the hamster pancreatic cancer model most tumors develop from within islets presumably from stem cells, we investigated the expression of Oct4 in this model. METHODS Two normal pancreases and 15 pancreatic cancers induced by N-nitrosobis(2-oxypropyl)amine (BOP) were processed for immunohistochemistry using a monoclonal Oct4 antibody at a concentration of 1:500. RESULTS In the normal pancreas, Oct4 was expressed only in islet cells in a diffuse cytoplasmic pattern. No nuclear staining was found in any cells. In 14 of the pancreatic cancers, nuclear staining was detected in many cells or in small foci. Diffuse cytoplasmic but no nuclear staining was found in one tumor and a mixed Golgi type and nuclear staining in two cases. Nuclear staining was also identified in early intrainsular ductular and in Ca in situ lesions. CONCLUSIONS BOP reactivates the Oct4 gene and can be considered an early tumor marker in this model.
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Abstract
A vast number of studies indicate the presence of stem/progenitor cells virtually in all tissues in adult organs, particularly in bone marrow. Recent studies, however, cast doubt about the existence of true stem cells in adult tissue. The complex integrity of several cells with distinct morphologic and functional properties in the mature pancreas confers an appropriate status for stem cell research. Several different types of cells residing in the islets or in the ductal epithelium have been proposed as adult pancreatic stem cells or progenitor cells. However, these reports do not provide conceivable proof for the presence of true pancreatic stem cells. On the other hand, there is considerable evidence indicating transdifferentiation of all adult pancreatic cells into each other, and under proper conditions, to nonpancreatic cells including oncocytes and hepatocytes. Observations pertaining to the putative pancreatic stem cells, transdifferentiation ability of the differentiated mature pancreatic cells in the normal and diseased pancreas will be discussed, and our own findings supporting the transdifferentiation pathway are presented in this article.
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Affiliation(s)
- Mehmet Yalniz
- UNMC Eppley Cancer Center, University of Nebraska Medical Center, Omaha 68198-6805, USA
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Abstract
Type 1 diabetes is one of the more costly chronic diseases of children and adolescents throughout North America and Europe, exhibiting an average estimated prevalence rate of nearly 0.2%. It occurs in genetically predisposed individuals when the immune system attacks and destroys specifically the insulin-producing beta cells of the pancreatic islets of Langerhans. While routine insulin therapy can provide diabetic patients with their daily insulin requirements, non-compliance and undetected hyperglycemic excursions often lead to subsequent long-term microvascular and macrovascular complications. The only real cure for type 1 diabetes is replacement of the beta cell mass, currently being accomplished through ecto-pancreatic transplantation and islet implantation. Both of these procedures suffer from a chronic shortage of available donor tissue in comparison to the number of potential recipients. To circumvent this need, three alternative approaches are being intensively investigated: (1) the production of surrogate cells by genetically modifying non-endocrine cells to secrete insulin in response to glucose challenge; (2) the trans-differentiation of non-endocrine stem/progenitor cells or mature cells to glucose-responsive adult tissue; and (3) the regulated differentiation of islet stem/progenitor cells to produce large numbers of mature, functional islets. In recent years, each of these approaches has made impressive advances, leading to the most important question, 'how soon will this new science be available to the patient?' In the present review, we discuss some of the recent advances, focusing primarily on the differentiation of islet stem cells to functional endocrine pancreas that may form the basis for future treatment.
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Affiliation(s)
- Ammon B Peck
- Department of Pathology, Immumology and Laboratory Medicine, College of Medicine, University of Florida, Gainesville 32610, USA.
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Bouckenooghe T, Vandewalle B, Moerman E, Danzé PM, Lukowiak B, Muharram G, Kerr-Conte J, Gmyr V, Laine B, Pattou F. Expression of progenitor cell markers during expansion of sorted human pancreatic beta cells. Gene Expr 2005; 12:83-98. [PMID: 15892450 PMCID: PMC6009112 DOI: 10.3727/000000005783992151] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Functional pancreatic beta cell mass is dynamic and although fully differentiated, beta cells are capable of reentering the cell cycle upon appropriate stimuli. Stimulating regeneration-competent cells in situ is clearly the most desirable way to restore damaged tissue. Regeneration by dedifferentiation and transdifferentiation is a potential source of cells exhibiting a more developmentally immature phenotype and a wide differentiation potential. In this context and to gain a better understanding of the transformation induced in human beta cells during forced in vitro expansion, we focused on identifying differences in gene expression along with phenotypical transformation between proliferating and quiescent human beta cells. FACS-purified beta cells from three different human pancreata were cultured during 3-4 months (8-10 subcultures) on HTB-9 cell matrix with hepatocyte growth factor. Gene expression profiling was performed on cells from each subculture on "in-house" pancreas-specific microarrays consisting of 218 genes and concomitant morphological transformations were studied by immunocytochemistry. Immunocytochemical studies indicated a shift from epithelial to neuroepithelial cell phenotype, including progenitor cell features such as protein gene product 9.5 (PGP 9.5), Reg, vimentin, and neurogenin 3 protein expression. The expression of 49 genes was downregulated, including several markers of endocrine differentiation while 76 were induced by cell expansion including several markers of progenitor cells. Their pattern also argues for the transdifferentiation of beta cells into progenitor cells, demonstrating neuroepithelial features and overexpressing both PBX1, a homeodomain protein that can bind as a heterodimer with PDX1 and could switch the nature of its transcriptional activity, and neurogenin 3, a key factor for the generation of endocrine islet cells. Our study of the machinery that regulates human beta cell expansion and dedifferentiation may help elucidate some of the critical genes that control the formation of adult pancreatic progenitor cells and hence design targets to modify their expression in view of the production of insulin-secreting cells.
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Affiliation(s)
- Thomas Bouckenooghe
- INSERM ERIT-M 0106, Faculty of Medicine, Place de Verdun, 59045 Lille, France
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16
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Yalniz M, Pour PM. Diabetes mellitus: a risk factor for pancreatic cancer? Langenbecks Arch Surg 2004; 390:66-72. [PMID: 15083362 DOI: 10.1007/s00423-004-0469-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2004] [Accepted: 01/22/2004] [Indexed: 01/03/2023]
Abstract
The relationship between pancreatic cancer (PC) and diabetes is controversial. While some investigators assume that type II diabetes is a predisposition to PC, recent data argue that diabetes and altered glucose metabolism are a consequence of PC, and yet, the clinical presentation of the altered glucose metabolism in these patients varies considerably. Around 70% of patients with PC have impaired glucose tolerance (IGT) or frank diabetes. Of these, nearly 60% show an improvement of IGT or diabetes after surgery, whereas the rest show only mild or no improvement. It appears that biologically there are three types of PC: (1) PC not associated with IGT or diabetes; (2) PC associated with IGT or diabetes in which the abnormality improves postoperatively; (3) PC associated with IGT or diabetes in which the abnormality does not improve postoperatively. Based on our own studies, we suggest that the reason for impaired glucose metabolism in most patients is the alteration of islet cells either by the carcinogen directly, or by diabetogenic substances released by cancer cells. The extent of the islet alteration (i.e. focal or diffuse) may determine whether the removal of tumor alone can improve the metabolic alteration. The elucidation of the mechanism is of immense importance for providing an early tumor marker and for developing preventative or therapeutic modalities.
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Affiliation(s)
- M Yalniz
- UNMC Eppley Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198-6805, USA
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Abstract
INTRODUCTION The mechanism of impaired glucose metabolism that develops in most patients with pancreatic cancer (PC) is obscure and the association between PC and diabetes is controversial. According to the published data, about 70% of patients with PC have an impaired glucose tolerance (IGT) or frank diabetes, whereas 30% do not. Up to 60% of the patients with IGT or diabetes show improvement in glucose metabolism after surgery, whereas other patients show only mild or no improvement. AIM To investigate our theory that there are three types of PC: 1) PC not associated with IGT or diabetes (IGT- subtype, approximately 20-30%); 2) PC associated with IGT or diabetes (IGT+ subtype, approximately 70-80%), in which the abnormality improves postoperatively (IGT+/- subtype, approximately 40-60%); or 3) PC associated with IGT or diabetes that does not improve after the tumor resection (IGT+/+ subtype, approximately 40-60%). METHODOLOGY AND RESULTS The review of the literature and our own experience, which is the subject of this article, suggests that the reason for impaired glucose metabolism in most patients is the alteration of islet cells, from which, in our view, cancer cells develop. There is a good possibility that the altered islet cells, and/or tumors derived from them, produce diabetogenic substances. The extent of the islet alteration (i.e., focal or diffuse) may determine whether the removal of the tumor alone can improve the metabolic alteration. CONCLUSION The elucidation of the mechanism is of immense importance for providing an early tumor marker and for developing preventative and therapeutic modalities.
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Affiliation(s)
- Murat Saruc
- UNMC Eppley Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198-6805, USA
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18
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Abstract
The pancreas is one of the body's most complex tissues composed of a mixture of endocrine and exocrine cell components. Although, islets comprise 1-2% of the pancreatic volume, there is some evidence that they control the function and the integrity of the pancreas and play the role of a gatekeeper. This review intends to highlight the importance of islet cells, not only for glucose metabolism, but also for their significant role in drug metabolism and diseases, especially in pancreatic cancer.
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Affiliation(s)
- Parviz M Pour
- UNMC Eppley Cancer Center, University of Nebraska Medical Center, Omaha 68198, USA.
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19
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Pour PM, Pandey KK, Batra SK. What is the origin of pancreatic adenocarcinoma? Mol Cancer 2003; 2:13. [PMID: 12636873 PMCID: PMC151686 DOI: 10.1186/1476-4598-2-13] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2002] [Accepted: 01/22/2003] [Indexed: 11/30/2022] Open
Abstract
The concept of pancreatic cancer origin is controversial. Acinar, ductal or islet cells have been hypothesized as the cell of origin. The pros and cons of each of these hypotheses are discussed. Based on the world literature and recent observations, pancreatic cells seem to have potential for phenotypical transdifferentiation, i.e ductal-islet, ductal-acinar, acinar-ductal, acinar-islet, islet-acinar and islet-ductal cells. Although the possibility is discussed that cancer may arise from either islet, ductal or acinar cells, the circumstances favoring the islet cells as the tumor cell origin include their greater transdifferentiation potency into both pancreatic and extrapancreatic cells, the presence of a variety of carcinogen-metabolizing enzymes, some of which are present exclusively in islet cells and the growth factor-rich environment of islets.
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Affiliation(s)
- Parviz M Pour
- The Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198 USA
- Department of Pathology and Microbiology University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198, USA
| | - Krishan K Pandey
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198, USA
| | - Surinder K Batra
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198, USA
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20
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Tsuchiya M, Tsuchiya K, Iwami Y, Ohgawara H. Analysis of gene expression and insulin secretion by monolayer-forming adult porcine pancreatic endocrine cells. Pancreas 2003; 26:71-5. [PMID: 12499920 DOI: 10.1097/00006676-200301000-00012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
INTRODUCTION We recently established a method of isolation and primary monolayer culture of porcine pancreatic endocrine cells that involves the use of nicotinamide. AIM To obtain genetic information on cultured porcine endocrine cells and to examine cell function in relation to insulin secretion during long-term culture. METHODOLOGY Gene expression of insulin and several transcription factors, including PDX-1, Beta2/NeuroD, Pax6, and Nkx6.1, was assessed by reverse transcription-polymerase chain reaction analysis, and the insulin protein level was estimated by immunohistochemistry and enzyme assay during a 12-week period. RESULTS During the culture period, insulin accumulation in the medium at 5 weeks had decreased by almost half the level of accumulation in the first week. In contrast to the alteration of secretory function, insulin gene expression was maintained for at least 12 weeks, and regulatory transcription factors were expressed at the same levels until 9 weeks. These observations suggest that gene expression is not involved in the cause of decreased baseline insulin secretion. Moreover, although the insulin response to high glucose and potassium loading was maintained, the magnitude of the responses to both stimuli was attenuated in the late period of culture. Insulin secretion tended to decrease in our culture system, and the secretory response to pharmacological stimulation was attenuated despite maintenance of messenger RNA expression of insulin and other islet-specific genes for at least 9 weeks in vitro. CONCLUSION These findings indicate that cell integrity is maintained and that the alteration in insulin secretion must be explained by another mechanism.
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Affiliation(s)
- Mariko Tsuchiya
- Institute of Geriatrics, Aoyama Hospital, Medical Research Institute, Tokyo Women's Medical University, Tokyo, Japan
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21
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Pour PM, Schmied BM, Ulrich AB, Friess H, Andrén-Sandberg A, Büchler MW. Abnormal differentiation of islet cells in pancreatic cancer. Pancreatology 2002; 1:110-6. [PMID: 12120188 DOI: 10.1159/000055802] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Pancreatic cancer in many patients is associated with altered glucose metabolism and abnormalities in pancreatic islet hormones at serum and tissue levels. Our previous studies have indicated a tendency of islet cells to differentiate toward ductal cell lineage, but the specificity of these findings for pancreatic cancer was not investigated. In the present study, we examined the immunoreactivity of pancreatic islets to antibodies against tumor-associated antigens DU-PAN-2, TAG-72 and CA19-9 in tissues from the normal pancreas, chronic pancreatitis and pancreatic cancer. Although no immunoreactive islet cells were found in the 12 normal pancreases and 20 chronic pancreatitis patients, 25 of 37 pancreatic cancer tissues showed the expression of these antigens, primarily CA19-9 and TAG-72, where the number of immunoreactive cells varied considerably from case to case. In 4 cases over 50% and in 2 of them more than 75% of the islets showed positive staining of 60-70% of islet cells within each islet. The presence of intrainsular ductular structures expressing the same antigen as the surrounding islet cells suggested transformation of antigen expressing islet cells to ductal cells. All but four islets were within or around the cancer favoring the notion that factors produced by cancer cells are responsible for the altered islet cell differentiation.
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Affiliation(s)
- P M Pour
- UNMC Eppley Cancer Center, Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebr., USA.
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22
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Abstract
Exocrine pancreatic cell types comprise greater than 90% of parenchymal cell mass in the adult pancreas. However, the factors regulating differentiation of acinar and ductal epithelial cells remain incompletely characterized. Like pancreatic islet cells, acinar and ductal cells arise from pluripotent precursors within embryonic pancreatic epithelium. Recent studies have suggested that a common pool of pluripotent stem cells is responsible for generating both endocrine and exocrine cell types, and that specific signaling pathways regulate a critical balance between endocrine and exocrine lineage commitment.
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Affiliation(s)
- A L Means
- Departments of Surgery and Cell Biology, Vanderbilt University School of Medicine, Nashville, Tenn., USA
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23
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Zhao M, Christie MR, Heaton N, George S, Amiel S, Cai Huang G. Amelioration of streptozotocin-induced diabetes in mice using human islet cells derived from long-term culture in vitro. Transplantation 2002; 73:1454-60. [PMID: 12023624 DOI: 10.1097/00007890-200205150-00015] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Long-term maintenance of the phenotype of beta cells in vitro is difficult. The objective of this study was to examine an in vitro method for preserving the capacity of adult human beta cells to express insulin. We evaluated the use of long-term cultured islet cells for the treatment of diabetic SCID mice. METHODS Human islets were isolated from cadaveric donors. The islets were cultured as monolayers and clusters in repeating cycles for 4 months. Thereafter, the cells were tested in vitro for their capacity to express insulin and to secrete insulin in response to glucose challenge. Finally, the cluster-cultured cells were transplanted under the kidney capsule and into the kidney tissue in streptozotocin (STZ)-induced diabetic SCID mice. RESULTS Approximately 3.6% of cultured islet cells in cluster phase expressed insulin at 4 months and this was confirmed using immuno-gold-labeling electron microscopy. The cultured islet cells secreted insulin in response to glucose challenge in a dose-dependent manner. After transplantation, the islet cells redifferentiated and generated >20% insulin positive cells. The 4-month cultured cells rendered the blood glucose level near normal in mild diabetic mice (7.25 mM+/-1.595 vs. 15.225 mM+/-2.55, P<0.0025). CONCLUSION It is possible to preserve the capacity of adult human islets to express insulin over a 4-month period in vitro, and this capacity was enhanced significantly by transplantation into SCID mice. The described system will be useful in studies of beta cell proliferation and differentiation.
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Affiliation(s)
- Min Zhao
- Department of Diabetes, Endocrinology, and Internal Medicine and Institutes of Liver Studies, King's College GKT Medical School, London SE5 9PJ, UK
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24
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Abstract
Pancreatic cancer has an extremely poor prognosis and lacks early diagnostic and therapeutic possibilities, mainly because of its silent course and explosive fatal outcome. The histogenesis of the disease and early biochemical and genetic alterations surrounding carcinogenesis are still controversial. In vitro studies offer a useful tool to study physiologic, pathophysiologic, differentiation, and transformation processes of cells and to understand some of these shortcomings. The extreme difficulties in isolating individual pancreatic cells and their purification by maintaining their native characteristics have limited research in this area. This review is intended to present and discuss the current availability of rodent and pancreatic cell lines, their differences as well as the difficulties, limitations, and characteristics of these cultured cells. Discussed are in vitro models; ductal, islet, and acinar cell culture; cell differentiation; cell transformation, including genetic and chromosomal alterations; as well as tumor cell markers. Also addressed are the advantages and problems associated with the cell culture in humans and rodents. Advancements in tissue culture technique and molecular biology offer steady progress in this important line of research. The improved methods not only promise the establishment of beta-cell cultures for the treatment of diabetes, but also for studying sequential genetic alterations during pancreatic carcinogenesis and in understanding the tumor cell origin.
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Affiliation(s)
- Alexis B Ulrich
- Eppley Cancer Center and the Department of Pathology and Microbiology, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198-6805, U.S.A
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25
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Muscarella P, Knobloch TJ, Ulrich AB, Casto BC, Moniaux N, Wittel UA, Melvin WS, Pour PM, Song H, Gold B, Batra SK, Weghorst CM. Identification and sequencing of the Syrian Golden hamster (Mesocricetus auratus) p16(INK4a) and p15(INK4b) cDNAs and their homozygous gene deletion in cheek pouch and pancreatic tumor cells. Gene 2001; 278:235-43. [PMID: 11707341 DOI: 10.1016/s0378-1119(01)00728-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Previous studies have shown that the p16(INK4a) tumor suppressor gene is inactivated in up to 98% of human pancreatic cancer specimens and 83% of oral squamous cell carcinomas. Inactivation of the related p15(INK4b) gene has also been identified in a number of tumors and cell lines, however, its role as an independent tumor suppressor remains to be elucidated. Chemically-induced tumors in the Syrian Golden hamster (Mesocricetus auratus) have been shown to be excellent representative models for the comparative development and progression of a number of human malignancies. The purpose of this study was to determine the importance of the p16(INK4a) and p15(INK4b) genes in two experimental hamster models for human pancreatic and oral carcinogenesis. First, hamster p16(INK4a) and p15(INK4b) cDNAs were cloned and sequenced. The hamster p16(INK4a) cDNA open reading frame (ORF) shares 78%, 80%, and 81% identity with the human, mouse, and rat p16(INK4a) sequences, respectively. Similarly, the hamster p15(INK4b) cDNA ORF shares 82% and 89% sequence identity with human and mouse p15(INK4b), respectively. Second, a deletion analysis of hamster p16(INK4a) and p15(INK4b) genes was performed for several tumorigenic and non-tumorigenic hamster cell lines and revealed that both p16(INK4a) and p15(INK4b) were homozygously deleted in a cheek pouch carcinoma cell line (HCPC) and two pancreatic adenocarcinoma cell lines (KL5B, H2T), but not in tissue matched, non-tumorigenic cheek pouch (POT2) or pancreatic (KL5N) cell lines. These data strongly suggest that homozygous deletion of the p16(INK4a) and p15(INK4b) genes plays a prominent role in hamster pancreatic and oral tumorigenesis, as has been well established in correlative studies in comparable human tumors. Furthermore, this study supports the comparative importance of the hamster pancreatic and cheek pouch models of carcinogenesis in subsequent mechanistic-, therapeutic-, and preventive-based studies aimed at providing important translational data applicable to pancreatic adenocarcinoma and oral squamous cell carcinoma in humans.
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Affiliation(s)
- P Muscarella
- Division of Surgery, College of Public Health, The Ohio State University, Columbus, OH 43210, USA
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Schneider MB, Standop J, Ulrich A, Wittel U, Friess H, Andrén-Sandberg A, Pour PM. Expression of nerve growth factors in pancreatic neural tissue and pancreatic cancer. J Histochem Cytochem 2001; 49:1205-10. [PMID: 11561004 DOI: 10.1177/002215540104901002] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
One of the characteristics of pancreatic cancer is its tendency to invade neural tissue. We hypothesized that the affinity of cancer cells for nerve tissue is related to the presence of growth factors in neural tissue and their receptors in cancer cells. Sections of pancreatic cancer and normal pancreatic tissue were examined by immunohistochemistry for the expression of the neurotrophins NGF, BDNF, NT-3, NT-4, and their receptors TrkA, TrkB, and TrkC, as well as the low-affinity receptor, p75NTR. TrkA expression was found in duct, islet, and cancer cells; TrkB was found in the alpha-cells of the islet only. The anti-pan-Trk antibody (TrkB3), which is presumed to recognize all three receptors, immunoreacted with duct and acinar cells in normal tissue and with cancer cells. The staining with TrkC was similar to that of TrkA. The low-affinity receptor p75NTR was expressed in the neural tissue and in scattered duct cells of the normal tissue only. Duct and acinar cells, as well as neural tissue and cancer cells, showed weak to strong immunoreactivity with NGF. NT-3 expression was noted in capillary endothelia and erythrocytes. NT-4 showed specific staining for ductule cells. The expression and distribution of neurotrophins and their receptors suggest their role in the potential of pancreatic cancer cells for neural invasion.
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Affiliation(s)
- M B Schneider
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-6805, USA
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Standop J, Schneider MB, Ulrich A, Pour PM. Experimental animal models in pancreatic carcinogenesis: lessons for human pancreatic cancer. Dig Dis 2001; 19:24-31. [PMID: 11385248 DOI: 10.1159/000050650] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The silent course of pancreatic cancer and its explosive fatal outcome have hindered studies of tumor histogenesis and the identification of early biochemical and genetic alterations that could help to diagnose the disease at a curable stage and develop therapeutic strategies. Experimental animal models provide important tools to assess risk factors, as well as preventive and therapeutic possibilities. Although several pancreatic cancer models presently exist, only models that closely resemble human tumors in morphological, clinical, and biological aspects present useful media for preclinical studies. Because an estimated 70% of human tumors are induced by carcinogens and because a significant association has been found between cigarette smoking and pancreatic cancer, chemically induced models are of particular value. Moreover, in such models the etiology, modifying factors, effects of diets, and naturally occurring products can be studied and early diagnostic, preventive, and therapeutic possibilities sought out. Many of the existing models are described in this review, and the advantages and shortcomings of each model and their clinical implications are discussed.
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Affiliation(s)
- J Standop
- UNMC Eppley Cancer Center, University of Nebraska Medical Center, Omaha, Nebr. 68198-6805, USA
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28
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Schmied BM, Ulrich A, Matsuzaki H, Ding X, Ricordi C, Weide L, Moyer MP, Batra SK, Adrian TE, Pour PM. Transdifferentiation of human islet cells in a long-term culture. Pancreas 2001; 23:157-71. [PMID: 11484918 DOI: 10.1097/00006676-200108000-00006] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
It has been established that ductal cells or precursor cells within the ductal tree of the pancreas can differentiate into islet cells. Although islet cells can also form exocrine cells, it is unclear whether they arise from precursor (stem) cells or from mature endocrine cells by transdifferentiation. Using a defined culture medium and technique for islet purification, for the first time we were able to maintain human islets in culture for more than a year. Multilabeling immunohistochemical and immunoelectron microscopic examination of the islets at different days of culture using islet cell markers (antibodies to hormones, neuron-specific enolase, chromogranin A) and ductal cell markers (cytokeratins 7 and 19, carbonic anhydrase II, DU-PAN2, CA 19-9, and MUC1) revealed that endocrine cells gradually transdifferentiate to ductal, acinar, and intermediary cells. Although islet hormone secretion ceased after day 28 in culture, endocrine cells were still detectable at day 60. However, later, all endocrine and exocrine cells were replaced by undifferentiated cells that expressed neuron-specific enolase, chromogranin A, laminin, vimentin, cytokeratin 7 and 19, alpha-1-antitrypsin, transforming growth factor-alpha, and epidermal growth factor receptor. Our data thus show that, under proper conditions, human islets can be maintained in vitro over a long period and that, in the culture condition, islet cells seem to transdifferentiate to exocrine cells and undifferentiated cells, which may be considered pancreatic precursor (stem) cells.
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Affiliation(s)
- B M Schmied
- Eppley Cancer Center, University of Nebraska Medical Center, Omaha 68198-6805, USA
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