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Abstract
Claudins are adhesion molecules located at the tight junctions between epithelial cells. A series of studies have now reported aberrant expression of claudin proteins in the context of neoplastic transformation, suggesting its role in tumorigenesis. However, the precise mechanisms are still not well understood. Studies on expression alterations of claudins have revealed a range of outcomes that reflect the complexity of claudins in terms of spatial localization, tumor type and stage of disease. The diverse and dynamic expression patterns of claudins in cancer are tightly controlled by a wide range of regulatory mechanisms, which are commonly modulated by oncogenic signaling pathways. The present review summarizes the recent knowledge describing the dysregulation of claudin expression in cancer and discusses the intrinsic and extrinsic determinants of the context-specific expression patterns of claudins.
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Medically Important Alterations in Transport Function and Trafficking of ABCG2. Int J Mol Sci 2021; 22:ijms22062786. [PMID: 33801813 PMCID: PMC8001156 DOI: 10.3390/ijms22062786] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/04/2021] [Accepted: 03/05/2021] [Indexed: 02/06/2023] Open
Abstract
Several polymorphisms and mutations in the human ABCG2 multidrug transporter result in reduced plasma membrane expression and/or diminished transport function. Since ABCG2 plays a pivotal role in uric acid clearance, its malfunction may lead to hyperuricemia and gout. On the other hand, ABCG2 residing in various barrier tissues is involved in the innate defense mechanisms of the body; thus, genetic alterations in ABCG2 may modify the absorption, distribution, excretion of potentially toxic endo- and exogenous substances. In turn, this can lead either to altered therapy responses or to drug-related toxic reactions. This paper reviews the various types of mutations and polymorphisms in ABCG2, as well as the ways how altered cellular processing, trafficking, and transport activity of the protein can contribute to phenotypic manifestations. In addition, the various methods used for the identification of the impairments in ABCG2 variants and the different approaches to correct these defects are overviewed.
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Landi C, Bergantini L, Cameli P, d'Alessandro M, Carleo A, Shaba E, Rottoli P, Bini L, Bargagli E. Idiopathic Pulmonary Fibrosis Serum proteomic analysis before and after nintedanib therapy. Sci Rep 2020; 10:9378. [PMID: 32523095 PMCID: PMC7287088 DOI: 10.1038/s41598-020-66296-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 05/16/2020] [Indexed: 11/30/2022] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is a fatal progressive disease with a median survival of 2–5 years. Nintedanib is a small tyrosine kinase inhibitor that reduces IPF progression, significantly slowing the annual decline in Forced Vital Capacity (FVC). Very little data is available on the molecular mechanisms of this treatment in IPF, despite a growing interest in the definition of IPF pathogenesis and target therapy. A functional proteomic approach was applied to the analysis of serum samples from IPF patients in order to highlight differential proteins potentially indicative of drug-induced molecular pathways modifications and response to therapy. Twelve serum samples were collected from six IPF patients in care at Siena Regional Referral Center for Interstitial Lung Diseases (ILDs) and treated with nintedanib for one year. Serum samples were analyzed at baseline (T0 before starting therapy) and after one year of treatment (T1) and underwent differential proteomic and bioinformatic analysis. Proteomic analysis revealed 13 protein species that were significantly increased after one year of treatment. When the targets of nintedanib (VEGFR, FGFR and PDGFR) were added, enrichment analysis extracted molecular pathways and process networks involved in cell differentiation (haptoglobin and albumin), coagulation (antithrombin III), epithelial mesenchymal transition, cell proliferation and transmigration. PI3K and MAPK induced up-regulation of apolipoprotein C3. Proteomic study found 13 protein species up-regulated in IPF patients after one year of nintedanib treatment. Haptoglobin, a central hub of our analysis was validated by 2D-WB and ELISA as theranostic marker in a more numerous populations of patients.
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Affiliation(s)
- Claudia Landi
- Functional Proteomics Lab, Dept. Life Sciences, University of Siena, Siena, Italy. .,Respiratory Diseases and Lung Transplant Unit, Dept. Internal and Specialist Medicine, AOUS, Siena, Italy.
| | - Laura Bergantini
- Respiratory Diseases and Lung Transplant Unit, Dept. Internal and Specialist Medicine, AOUS, Siena, Italy
| | - Paolo Cameli
- Respiratory Diseases and Lung Transplant Unit, Dept. Internal and Specialist Medicine, AOUS, Siena, Italy
| | - Miriana d'Alessandro
- Respiratory Diseases and Lung Transplant Unit, Dept. Internal and Specialist Medicine, AOUS, Siena, Italy
| | - Alfonso Carleo
- Department of Pneumology, Medical School Hannover (MHH), Hannover, Germany
| | - Enxhi Shaba
- Functional Proteomics Lab, Dept. Life Sciences, University of Siena, Siena, Italy
| | - Paola Rottoli
- Respiratory Diseases and Lung Transplant Unit, Dept. Internal and Specialist Medicine, AOUS, Siena, Italy
| | - Luca Bini
- Functional Proteomics Lab, Dept. Life Sciences, University of Siena, Siena, Italy
| | - Elena Bargagli
- Respiratory Diseases and Lung Transplant Unit, Dept. Internal and Specialist Medicine, AOUS, Siena, Italy
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Török G, Erdei Z, Lilienberg J, Apáti Á, Homolya L. The importance of transporters and cell polarization for the evaluation of human stem cell-derived hepatic cells. PLoS One 2020; 15:e0227751. [PMID: 31971960 PMCID: PMC6977753 DOI: 10.1371/journal.pone.0227751] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 12/27/2019] [Indexed: 12/20/2022] Open
Abstract
One of the most promising applications of human pluripotent stem cells is their utilization for human-based pharmacological models. Despite the fact that membrane transporters expressed in the liver play pivotal role in various hepatic functions, thus far only little attention was devoted to the membrane transporter composition of the stem cell-derived liver models. In the present work, we have differentiated HUES9, a human embryonic stem cell line, toward the hepatic lineage, and monitored the expression levels of numerous differentiation marker and liver transporter genes with special focus on ABC transporters. In addition, the effect of bile acid treatment and polarizing culturing conditions on hepatic maturation has been assessed. We found that most transporter genes crucial for hepatic functions are markedly induced during hepatic differentiation; however, as regards the transporter composition the end-stage cells still exhibited dual, hepatocyte and cholangiocyte character. Although the bile acid treatment and sandwich culturing only slightly influenced the gene expressions, the stimulated cell polarization resulted in formation of bile canaliculi and proper localization of transporters. Our results point to the importance of membrane transporters in human stem cell-derived hepatic models and demonstrate the relevance of cell polarization in generation of applicable cellular models with correctly localized transporters. On the basis of our observations we suggest that conventional criteria for the evaluation of the quality of stem cell-derived hepatocyte-like cells ought to be augmented with additional elements, such as polarized and functional expression of hepatic transporters.
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Affiliation(s)
- György Török
- Molecular Cell Biology Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
| | - Zsuzsa Erdei
- Molecular Cell Biology Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
| | - Julianna Lilienberg
- Molecular Cell Biology Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
| | - Ágota Apáti
- Molecular Cell Biology Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
| | - László Homolya
- Molecular Cell Biology Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
- * E-mail:
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Role of Claudin Proteins in Regulating Cancer Stem Cells and Chemoresistance-Potential Implication in Disease Prognosis and Therapy. Int J Mol Sci 2019; 21:ijms21010053. [PMID: 31861759 PMCID: PMC6982342 DOI: 10.3390/ijms21010053] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 12/11/2019] [Accepted: 12/13/2019] [Indexed: 12/11/2022] Open
Abstract
Claudins are cell–cell adhesion proteins, which are expressed in tight junctions (TJs), the most common apical cell-cell adhesion. Claudin proteins help to regulate defense and barrier functions, as well as differentiation and polarity in epithelial and endothelial cells. A series of studies have now reported dysregulation of claudin proteins in cancers. However, the precise mechanisms are still not well understood. Nonetheless, studies have clearly demonstrated a causal role of multiple claudins in the regulation of epithelial to mesenchymal transition (EMT), a key feature in the acquisition of a cancer stem cell phenotype in cancer cells. In addition, claudin proteins are known to modulate therapy resistance in cancer cells, a feature associated with cancer stem cells. In this review, we have focused primarily on highlighting the causal link between claudins, cancer stem cells, and therapy resistance. We have also contemplated the significance of claudins as novel targets in improving the efficacy of cancer therapy. Overall, this review provides a much-needed understanding of the emerging role of claudin proteins in cancer malignancy and therapeutic management.
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Mózner O, Bartos Z, Zámbó B, Homolya L, Hegedűs T, Sarkadi B. Cellular Processing of the ABCG2 Transporter-Potential Effects on Gout and Drug Metabolism. Cells 2019; 8:E1215. [PMID: 31597297 PMCID: PMC6830335 DOI: 10.3390/cells8101215] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/04/2019] [Accepted: 10/05/2019] [Indexed: 02/07/2023] Open
Abstract
The human ABCG2 is an important plasma membrane multidrug transporter, involved in uric acid secretion, modulation of absorption of drugs, and in drug resistance of cancer cells. Variants of the ABCG2 transporter, affecting cellular processing and trafficking, have been shown to cause gout and increased drug toxicity. In this paper, we overview the key cellular pathways involved in the processing and trafficking of large membrane proteins, focusing on ABC transporters. We discuss the information available for disease-causing polymorphic variants and selected mutations of ABCG2, causing increased degradation and impaired travelling of the transporter to the plasma membrane. In addition, we provide a detailed in silico analysis of an as yet unrecognized loop region of the ABCG2 protein, in which a recently discovered mutation may actually promote ABCG2 membrane expression. We suggest that post-translational modifications in this unstructured loop at the cytoplasmic surface of the protein may have special influence on ABCG2 processing and trafficking.
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Affiliation(s)
- Orsolya Mózner
- Institute of Enzymology, Research Centre for Natural Sciences, Magyar Tudosok krt. 2, 1117 Budapest, Hungary.
| | - Zsuzsa Bartos
- Institute of Enzymology, Research Centre for Natural Sciences, Magyar Tudosok krt. 2, 1117 Budapest, Hungary.
- MTA-SE Molecular Biophysics Research Group, Hungarian Academy of Sciences, Tűzoltó u. 37-47, 1094 Budapest, Hungary.
| | - Boglárka Zámbó
- Institute of Enzymology, Research Centre for Natural Sciences, Magyar Tudosok krt. 2, 1117 Budapest, Hungary.
| | - László Homolya
- Institute of Enzymology, Research Centre for Natural Sciences, Magyar Tudosok krt. 2, 1117 Budapest, Hungary.
| | - Tamás Hegedűs
- MTA-SE Molecular Biophysics Research Group, Hungarian Academy of Sciences, Tűzoltó u. 37-47, 1094 Budapest, Hungary.
- Department of Biophysics and Radiation Biology, Semmelweis University, Tűzoltó u. 37-47, 1094 Budapest, Hungary.
| | - Balázs Sarkadi
- Institute of Enzymology, Research Centre for Natural Sciences, Magyar Tudosok krt. 2, 1117 Budapest, Hungary.
- Department of Biophysics and Radiation Biology, Semmelweis University, Tűzoltó u. 37-47, 1094 Budapest, Hungary.
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Apáti Á, Varga N, Berecz T, Erdei Z, Homolya L, Sarkadi B. Application of human pluripotent stem cells and pluripotent stem cell-derived cellular models for assessing drug toxicity. Expert Opin Drug Metab Toxicol 2018; 15:61-75. [PMID: 30526128 DOI: 10.1080/17425255.2019.1558207] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Introduction: Human pluripotent stem cells (hPSCs) are capable of differentiating into all types of cells in the body and so provide suitable toxicology screening systems even for hard-to-obtain human tissues. Since hPSCs can also be generated from differentiated cells and current gene editing technologies allow targeted genome modifications, hPSCs can be applied for drug toxicity screening both in normal and disease-specific models. Targeted hPSC differentiation is still a challenge but cardiac, neuronal or liver cells, and complex cellular models are already available for practical applications. Areas covered: The authors review new gene-editing and cell-biology technologies to generate sensitive toxicity screening systems based on hPSCs. Then the authors present the use of undifferentiated hPSCs for examining embryonic toxicity and discuss drug screening possibilities in hPSC-derived models. The authors focus on the application of human cardiomyocytes, hepatocytes, and neural cultures in toxicity testing, and discuss the recent possibilities for drug screening in a 'body-on-a-chip' model system. Expert opinion: hPSCs and their genetically engineered derivatives provide new possibilities to investigate drug toxicity in human tissues. The key issues in this regard are still the selection and generation of proper model systems, and the interpretation of the results in understanding in vivo drug effects.
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Affiliation(s)
- Ágota Apáti
- a Institute of Enzymology , Research Centre for Natural Sciences , Budapest , Hungary
| | - Nóra Varga
- a Institute of Enzymology , Research Centre for Natural Sciences , Budapest , Hungary
| | - Tünde Berecz
- a Institute of Enzymology , Research Centre for Natural Sciences , Budapest , Hungary
| | - Zsuzsa Erdei
- a Institute of Enzymology , Research Centre for Natural Sciences , Budapest , Hungary
| | - László Homolya
- a Institute of Enzymology , Research Centre for Natural Sciences , Budapest , Hungary
| | - Balázs Sarkadi
- a Institute of Enzymology , Research Centre for Natural Sciences , Budapest , Hungary
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