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Wang SR, Mallard CG, Cairns CA, Chung HK, Yoo D, Jaladanki SK, Xiao L, Wang JY. Stabilization of Cx43 mRNA via RNA-binding protein HuR regulated by polyamines enhances intestinal epithelial barrier function. Am J Physiol Gastrointest Liver Physiol 2023; 325:G518-G527. [PMID: 37788332 PMCID: PMC10894663 DOI: 10.1152/ajpgi.00143.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 08/22/2023] [Accepted: 09/29/2023] [Indexed: 10/05/2023]
Abstract
Gut barrier dysfunction occurs commonly in patients with critical disorders, leading to the translocation of luminal toxic substances and bacteria to the bloodstream. Connexin 43 (Cx43) acts as a gap junction protein and is crucial for intercellular communication and the diffusion of nutrients. The levels of cellular Cx43 are tightly regulated by multiple factors, including polyamines, but the exact mechanism underlying the control of Cx43 expression remains largely unknown. The RNA-binding protein HuR regulates the stability and translation of target mRNAs and is involved in many aspects of intestinal epithelial pathobiology. Here we show that HuR directly bound to Cx43 mRNA via its 3'-untranslated region in intestinal epithelial cells (IECs) and this interaction enhanced Cx43 expression by stabilizing Cx43 mRNA. Depletion of cellular polyamines inhibited the [HuR/Cx43 mRNA] complex and decreased the level of Cx43 protein by destabilizing its mRNA, but these changes were prevented by ectopic overexpression of HuR. Polyamine depletion caused intestinal epithelial barrier dysfunction, which was reversed by ectopic Cx43 overexpression. Moreover, overexpression of checkpoint kinase 2 in polyamine-deficient cells increased the [HuR/Cx43 mRNA] complex, elevated Cx43 levels, and promoted barrier function. These findings indicate that Cx43 mRNA is a novel target of HuR in IECs and that polyamines regulate Cx43 mRNA stability via HuR, thus playing a critical role in the maintenance of intestinal epithelial barrier function.NEW & NOTEWORTHY The current study shows that polyamines stabilize the Cx43 mRNA via HuR, thus enhancing the function of the Cx43-mediated gap junction. These findings suggest that induced Cx43 by HuR plays a critical role in the process by which polyamines regulate intestinal epithelial barrier.
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Affiliation(s)
- Shelley R Wang
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Caroline G Mallard
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Cassandra A Cairns
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Hee Kyoung Chung
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Dongyoon Yoo
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Suraj K Jaladanki
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Lan Xiao
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - Jian-Ying Wang
- Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland, United States
- Department of Pathology, University of Maryland School of Medicine, Baltimore, Maryland, United States
- Baltimore Veterans Affairs Medical Center, Baltimore, Maryland, United States
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2
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Van Campenhout R, Leroy K, Cooreman A, Tabernilla A, Cogliati B, Kadam P, Vinken M. Connexin-Based Channels in the Liver. Compr Physiol 2022; 12:4147-4163. [PMID: 35950654 DOI: 10.1002/cphy.c220007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Connexin proteins oligomerize in hexameric structures called connexin hemichannels, which then dock to form gap junctions. Gap junctions direct cell-cell communication by allowing the exchange of small molecules and ions between neighboring cells. In this way, hepatic gap junctions support liver homeostasis. Besides serving as building blocks for gap junctions, connexin hemichannels provide a pathway between the intracellular and the extracellular environment. The activation of connexin hemichannels is associated with acute and chronic liver pathologies. This article discusses the role of gap junctions and connexin hemichannels in the liver. © 2022 American Physiological Society. Compr Physiol 12:1-17, 2022.
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Affiliation(s)
- Raf Van Campenhout
- Entity of In Vitro Toxicology and Dermato-Cosmetology, Department of Pharmaceutical and Pharmacological Sciences, Vrije Universiteit Brussel, Brussels, Belgium
| | - Kaat Leroy
- Entity of In Vitro Toxicology and Dermato-Cosmetology, Department of Pharmaceutical and Pharmacological Sciences, Vrije Universiteit Brussel, Brussels, Belgium
| | - Axelle Cooreman
- Entity of In Vitro Toxicology and Dermato-Cosmetology, Department of Pharmaceutical and Pharmacological Sciences, Vrije Universiteit Brussel, Brussels, Belgium
| | - Andrés Tabernilla
- Entity of In Vitro Toxicology and Dermato-Cosmetology, Department of Pharmaceutical and Pharmacological Sciences, Vrije Universiteit Brussel, Brussels, Belgium
| | - Bruno Cogliati
- School of Veterinary Medicine and Animal Science, Department of Pathology, University of São Paulo, São Paulo, Brazil
| | - Prashant Kadam
- Entity of In Vitro Toxicology and Dermato-Cosmetology, Department of Pharmaceutical and Pharmacological Sciences, Vrije Universiteit Brussel, Brussels, Belgium
| | - Mathieu Vinken
- Entity of In Vitro Toxicology and Dermato-Cosmetology, Department of Pharmaceutical and Pharmacological Sciences, Vrije Universiteit Brussel, Brussels, Belgium
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3
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Applicability of Scrape Loading-Dye Transfer Assay for Non-Genotoxic Carcinogen Testing. Int J Mol Sci 2021; 22:ijms22168977. [PMID: 34445682 PMCID: PMC8396440 DOI: 10.3390/ijms22168977] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/30/2021] [Accepted: 07/31/2021] [Indexed: 12/27/2022] Open
Abstract
Dysregulation of gap junction intercellular communication (GJIC) is recognized as one of the key hallmarks for identifying non-genotoxic carcinogens (NGTxC). Currently, there is a demand for in vitro assays addressing the gap junction hallmark, which would have the potential to eventually become an integral part of an integrated approach to the testing and assessment (IATA) of NGTxC. The scrape loading-dye transfer (SL-DT) technique is a simple assay for the functional evaluation of GJIC in various in vitro cultured mammalian cells and represents an interesting candidate assay. Out of the various techniques for evaluating GJIC, the SL-DT assay has been used frequently to assess the effects of various chemicals on GJIC in toxicological and tumor promotion research. In this review, we systematically searched the existing literature to gather papers assessing GJIC using the SL-DT assay in a rat liver epithelial cell line, WB-F344, after treating with chemicals, especially environmental and food toxicants, drugs, reproductive-, cardio- and neuro-toxicants and chemical tumor promoters. We discuss findings derived from the SL-DT assay with the known knowledge about the tumor-promoting activity and carcinogenicity of the assessed chemicals to evaluate the predictive capacity of the SL-DT assay in terms of its sensitivity, specificity and accuracy for identifying carcinogens. These data represent important information with respect to the applicability of the SL-DT assay for the testing of NGTxC within the IATA framework.
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Burmistrov V, Saxena R, Pitushkin D, Butov GM, Chung FL, Aggarwal M. Adamantyl Isothiocyanates as Mutant p53 Rescuing Agents and Their Structure-Activity Relationships. J Med Chem 2021; 64:6621-6633. [PMID: 33961435 PMCID: PMC9924099 DOI: 10.1021/acs.jmedchem.0c01971] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Mutant p53 rescue by small molecules is a promising therapeutic strategy. In this structure-activity relationship study, we examined a series of adamantyl isothiocyanates (Ad-ITCs) to discover novel agents as therapeutics by targeting mutant p53. We demonstrated that the alkyl chain connecting adamantane and ITC is a crucial determinant for Ad-ITC inhibitory potency. Ad-ITC 6 with the longest chain between ITC and adamantane displayed the maximum growth inhibition in p53R280K, p53R273H, or p53R306Stop mutant cells. Ad-ITC 6 acted in a mutant p53-dependent manner. It rescued p53R280K and p53R273H mutants, thereby resulting in upregulating canonical wild-type (WT) p53 targets and phosphorylating ATM. Ad-ISeC 14 with selenium showed a significantly enhanced inhibitory potency, without affecting its ability to rescue mutant p53. Ad-ITCs selectively depleted mutant p53, but not the WT, and this activity correlates with their inhibitory potencies. These data suggest that Ad-ITCs may serve as novel promising leads for the p53-targeted drug development.
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Affiliation(s)
- Vladimir Burmistrov
- Volgograd State Technical University, Volgograd, 400005, Russia,Department of Chemistry, Technology and Equipment of Chemical Industry, Volzhsky Polytechnic Institute (branch) Volgograd State Technical University, Volzhsky, 404121, Russia
| | - Rahul Saxena
- Department of Biochemistry and Molecular and Cellular Biology, Georgetown University, Washington, DC 20007, USA
| | | | - Gennady M. Butov
- Volgograd State Technical University, Volgograd, 400005, Russia,Department of Chemistry, Technology and Equipment of Chemical Industry, Volzhsky Polytechnic Institute (branch) Volgograd State Technical University, Volzhsky, 404121, Russia
| | - Fung-Lung Chung
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington DC 20007, USA
| | - Monika Aggarwal
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington DC 20007, USA,Correspondence: Monika Aggarwal, Ph.D, Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington DC 20007, USA, Phone: 202-687-3648; Fax: 202-687-1068;
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5
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Dastych M, Hubatka F, Turanek-Knotigova P, Masek J, Kroupa R, Raška M, Turanek J, Prochazka L. Overexpression of CD44v8-10 in Colon Polyps-A Possible Key to Early Diagnosis. Pathol Oncol Res 2021; 27:614281. [PMID: 34257584 PMCID: PMC8262190 DOI: 10.3389/pore.2021.614281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 02/26/2021] [Indexed: 01/10/2023]
Abstract
Background and aims: The majority of colorectal cancers arise from detectable adenomatous or serrated lesions. Here we demonstrate how deregulated alternative splicing of CD44 gene in diseased colon mucosa results in downregulation of standard isoform of CD44 gene (CD44s) and upregulation of variant isoform CD44v8-10. Our aim is to show that upregulation of CD44v8-10 isoform is a possible marker of precancerous lesion in human colon. Methods: We analysed pairs of fresh biopsy specimen of large intestine in a cohort of 50 patients. We studied and compared alternative splicing profile of CD44 gene in colon polyps and adjoined healthy colon mucosa. We performed end-point and qRT PCR, western blotting, IHC staining and flow cytometry analyses. Results: We detected more than five-fold overexpression of CD44v8-10 isoform and almost twenty-fold downregulation of standard isoform CD44s in colon polyps compared to adjoined healthy tissue with p = 0.018 and p < 0.001 in a cohort of 50 patients. Our results also show that aberrant splicing of CD44 occurs in both biologically distinct subtypes of colorectal adenoma possibly in ESRP-1 specific manner. Conclusion: 92% of the colon polyp positive patients overexpressed CD44v8-10 isoform in their colon polyps while only 36% of them had positive fecal occult blood test which is currently a standard non-invasive screening technique. Impact: We believe that our results are important for further steps leading to application of CD44v8-10 isoform as a biomarker of colorectal precancerosis in non-invasive detection. Early detection of colon precancerosis means successful prevention of colorectal carcinoma.
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Affiliation(s)
- Milan Dastych
- Department of Gastroenterology and Internal Medicine, University Hospital Brno and Faculty of Medicine Masaryk University Brno, Brno, Czech Republic
| | - Frantisek Hubatka
- Department of Pharmacology and Toxicology, Veterinary Research Institute, Brno, Czech Republic.,C2P NEXARS, Campus Science Park, Brno, Czech Republic
| | - Pavlina Turanek-Knotigova
- Department of Pharmacology and Toxicology, Veterinary Research Institute, Brno, Czech Republic.,C2P NEXARS, Campus Science Park, Brno, Czech Republic
| | - Josef Masek
- Department of Pharmacology and Toxicology, Veterinary Research Institute, Brno, Czech Republic
| | - Radek Kroupa
- Department of Gastroenterology and Internal Medicine, University Hospital Brno and Faculty of Medicine Masaryk University Brno, Brno, Czech Republic
| | - Milan Raška
- Department of Immunology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic
| | - Jaroslav Turanek
- Department of Pharmacology and Toxicology, Veterinary Research Institute, Brno, Czech Republic.,C2P NEXARS, Campus Science Park, Brno, Czech Republic.,Faculty of Medicine in Hradec Kralove, Institute of Hygiene and Preventive Medicine, Charles University, Hradec Kralove, Czech Republic.,Institute of Physics of the Czech Academy of Sciences, Prague 8, Czech Republic
| | - Lubomir Prochazka
- Department of Pharmacology and Toxicology, Veterinary Research Institute, Brno, Czech Republic
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6
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Kukushkin ME, Skvortsov DA, Kalinina MA, Tafeenko VA, Burmistrov VV, Butov GM, Zyk NV, Majouga AG, Beloglazkina EK. Synthesis and cytotoxicity of oxindoles dispiro derivatives with thiohydantoin and adamantane fragments. PHOSPHORUS SULFUR 2020. [DOI: 10.1080/10426507.2020.1723590] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
| | - Dmitriy A. Skvortsov
- Department of Chemistry, Moscow State University (MSU), Moscow, Russia
- Faculty of Biology and Biotechnologies, Higher School of Economics, Moscow, Russia
| | | | | | - Vladimir V. Burmistrov
- Volzhsky Polytechnic Institute (Branch), Volgograd State Technical University, Volgograd oblast, Russia
| | - Gennady M. Butov
- Volzhsky Polytechnic Institute (Branch), Volgograd State Technical University, Volgograd oblast, Russia
| | - Nikolai V. Zyk
- Department of Chemistry, Moscow State University (MSU), Moscow, Russia
| | - Alexander G. Majouga
- Department of Chemistry, Moscow State University (MSU), Moscow, Russia
- Chemistry Department, Dmitry Mendeleev University of Chemical Technology of Russia, Moscow, Russia
- National University of Science and Technology MISiS, Moscow, Russia
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7
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Bartheldyová E, Effenberg R, Mašek J, Procházka L, Knötigová PT, Kulich P, Hubatka F, Velínská K, Zelníčková J, Zouharová D, Fojtíková M, Hrebík D, Plevka P, Mikulík R, Miller AD, Macaulay S, Zyka D, Drož L, Raška M, Ledvina M, Turánek J. Hyaluronic Acid Surface Modified Liposomes Prepared via Orthogonal Aminoxy Coupling: Synthesis of Nontoxic Aminoxylipids Based on Symmetrically α-Branched Fatty Acids, Preparation of Liposomes by Microfluidic Mixing, and Targeting to Cancer Cells Expressing CD44. Bioconjug Chem 2018; 29:2343-2356. [PMID: 29898364 DOI: 10.1021/acs.bioconjchem.8b00311] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
New synthetic aminoxy lipids are designed and synthesized as building blocks for the formulation of functionalized nanoliposomes by microfluidization using a NanoAssemblr. Orthogonal binding of hyaluronic acid onto the outer surface of functionalized nanoliposomes via aminoxy coupling ( N-oxy ligation) is achieved at hemiacetal function of hyaluronic acid and the structure of hyaluronic acid-liposomes is visualized by transmission electron microscopy and cryotransmission electron microscopy. Observed structures are in a good correlation with data obtained by dynamic light scattering (size and ζ-potential). In vitro experiments on cell lines expressing CD44 receptors demonstrate selective internalization of fluorochrome-labeled hyaluronic acid-liposomes, while cells with down regulated CD44 receptor levels exhibit very low internalization of hyaluronic acid-liposomes. A method based on microfluidization mixing was developed for preparation of monodispersive unilamellar liposomes containing aminoxy lipids and orthogonal binding of hyaluronic acid onto the liposomal surface was demonstrated. These hyaluronic acid-liposomes represent a potentially new drug delivery platform for CD44-targeted anticancer drugs as well as for immunotherapeutics and vaccines.
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Affiliation(s)
- Eliška Bartheldyová
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Roman Effenberg
- Department of Chemistry of Natural Compounds , University of Chemistry and Technology , Technická 5 , 166 28 Prague 6, Czech Republic
| | - Josef Mašek
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Lubomír Procházka
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Pavlína Turánek Knötigová
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Pavel Kulich
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - František Hubatka
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Kamila Velínská
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Jaroslava Zelníčková
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Darina Zouharová
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Martina Fojtíková
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Dominik Hrebík
- Central European Institute of Technology CEITEC, Structural Virology , Masaryk University , Kamenice 753/5 , 62500 Brno , Czech Republic
| | - Pavel Plevka
- Central European Institute of Technology CEITEC, Structural Virology , Masaryk University , Kamenice 753/5 , 62500 Brno , Czech Republic
| | - Robert Mikulík
- The International Clinical Research Center of St. Anne's University Hospital Brno , 656 91 Brno , Czech Republic
| | - Andrew D Miller
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Stuart Macaulay
- Malvern Instruments , Great Malvern WR14 1XZ , United Kingdom
| | - Daniel Zyka
- APIGENEX s.r.o. , Poděbradská 173/5 , Prague 9 , 190 00 , Czech Republic
| | - Ladislav Drož
- APIGENEX s.r.o. , Poděbradská 173/5 , Prague 9 , 190 00 , Czech Republic
| | - Milan Raška
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic.,Department of Immunology and Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry , Palacky University Olomouc , Hněvotínská 3 , 775 15 Olomouc , Czech Republic
| | - Miroslav Ledvina
- Department of Chemistry of Natural Compounds , University of Chemistry and Technology , Technická 5 , 166 28 Prague 6, Czech Republic
| | - Jaroslav Turánek
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
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8
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Choi S, Kim S, Lee J, Lim H, Kim Y, Tian C, So H, Park R, Choung Y.H. Gingko biloba extracts protect auditory hair cells from cisplatin-induced ototoxicity by inhibiting perturbation of gap junctional intercellular communication. Neuroscience 2013; 244:49-61. [DOI: 10.1016/j.neuroscience.2013.04.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 03/30/2013] [Accepted: 04/01/2013] [Indexed: 12/23/2022]
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9
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Wanka L, Iqbal K, Schreiner PR. The lipophilic bullet hits the targets: medicinal chemistry of adamantane derivatives. Chem Rev 2013; 113:3516-604. [PMID: 23432396 PMCID: PMC3650105 DOI: 10.1021/cr100264t] [Citation(s) in RCA: 433] [Impact Index Per Article: 39.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Lukas Wanka
- Institute of Organic Chemistry, Justus-Liebig University Giessen, Heinrich-Buff-Ring 58, 35392 Giessen, Germany; Fax +49(641)9934309
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island, NY 10314-6399, USA
| | - Khalid Iqbal
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island, NY 10314-6399, USA
| | - Peter R. Schreiner
- Institute of Organic Chemistry, Justus-Liebig University Giessen, Heinrich-Buff-Ring 58, 35392 Giessen, Germany; Fax +49(641)9934309
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10
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Pichler V, Heffeter P, Valiahdi SM, Kowol CR, Egger A, Berger W, Jakupec MA, Galanski M, Keppler BK. Unsymmetric mono- and dinuclear platinum(IV) complexes featuring an ethylene glycol moiety: synthesis, characterization, and biological activity. J Med Chem 2012. [PMID: 23194425 DOI: 10.1021/jm301645g] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Eight novel mononuclear and two dinuclear platinum(IV) complexes were synthesized and characterized by elemental analysis, one- and two-dimensional NMR spectroscopy, mass spectrometry, and reversed-phase HPLC (log k(w)) and in one case by X-ray diffraction. Cytotoxicity of the compounds was studied in three human cancer cell lines (CH1, SW480, and A549) by means of the MTT assay, featuring IC(50) values to the low micromolar range. Furthermore a selected set of compounds was investigated in additional cancer cell lines (P31 and P31/cis, A2780 and A2780/cis, SW1573, 2R120, and 2R160) with regard to their resistance patterns, offering a distinctly different scheme compared to cisplatin. To gain further insights into the mode of action, drug uptake, DNA synthesis inhibition, cell cycle effects, and induction of apoptosis were determined for two characteristic substances.
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Affiliation(s)
- Verena Pichler
- Institute of Inorganic Chemistry, University of Vienna, Waehringer Strasse 42, A-1090 Vienna, Austria
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11
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Novel Anticancer Platinum(IV) Complexes with Adamantylamine: Their Efficiency and Innovative Chemotherapy Strategies Modifying Lipid Metabolism. Met Based Drugs 2011; 2008:417897. [PMID: 18414587 PMCID: PMC2291354 DOI: 10.1155/2008/417897] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2007] [Revised: 10/08/2007] [Accepted: 10/18/2007] [Indexed: 11/18/2022] Open
Abstract
The impressive impact of cisplatin on cancer on one side and severe side effects, as well as the development of drug resistance during treatment on the other side, were the factors motivating scientists to design and synthesize new more potent analogues lacking disadvantages of cisplatin. Platinum(IV) complexes represent one of the perspective groups of platinum-based drugs. In this review, we summarize recent findings on both in vitro and in vivo effects of platinum(IV) complexes with adamantylamine. Based on a literary overview of the mechanisms of activity of platinum-based cytostatics, we discuss opportunities for modulating the effects of novel platinum complexes through interactions with apoptotic signaling pathways and with cellular lipids, including modulations of the mitochondrial cell death pathway, oxidative stress, signaling of death ligands, lipid metabolism/signaling, or intercellular communication. These approaches might significantly enhance the efficacy of both novel and established platinum-based cytostatics.
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12
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Decrock E, Vinken M, Bol M, D'Herde K, Rogiers V, Vandenabeele P, Krysko DV, Bultynck G, Leybaert L. Calcium and connexin-based intercellular communication, a deadly catch? Cell Calcium 2011; 50:310-21. [PMID: 21621840 DOI: 10.1016/j.ceca.2011.05.007] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 05/03/2011] [Accepted: 05/05/2011] [Indexed: 10/18/2022]
Abstract
Ca(2+) is known as a universal messenger mediating a wide variety of cellular processes, including cell death. In fact, this ion has been proposed as the 'cell death master', not only at the intracellular but also at the intercellular level. The most direct form of intercellular spread of cell death is mediated by gap junction channels. These channels have been shown to propagate cell death as well as cell survival signals between the cytoplasm of neighbouring cells, reflecting the dual role of Ca(2+) signals, i.e. cell death versus survival. Its precursor, the unopposed hemichannel (half of a gap junction channel), has recently joined in as a toxic pore connecting the intracellular with the extracellular environment and allowing the passage of a range of substances. The biochemical nature of the so-called intercellular cell death molecule, transferred through gap junctions or released/taken up via hemichannels, remains elusive but several studies pinpoint Ca(2+) itself or its messenger inositol trisphosphate as the responsible masters in crime. Although direct evidence is still lacking, indirect data including Ca(2+) involvement in intercellular communication and cell death, and effects of intercellular communication on intracellular Ca(2+) homeostasis, support this hypothesis. In addition, hemichannels and their molecular building blocks, connexin or pannexin proteins, may exert their effects on Ca(2+)-dependent cell death at the intracellular level, independently from their channel functions. This review provides a cutting edge overview of the current knowledge and underscores the intimate connection between intercellular communication, Ca(2+) signalling and cell death.
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Affiliation(s)
- Elke Decrock
- Department of Basic Medical Sciences - Physiology Group, Faculty of Medicine and Health Sciences, Ghent University, B-9000 Ghent, Belgium
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13
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Wang Q, You T, Yuan D, Han X, Hong X, He B, Wang L, Tong X, Tao L, Harris AL. Cisplatin and oxaliplatin inhibit gap junctional communication by direct action and by reduction of connexin expression, thereby counteracting cytotoxic efficacy. J Pharmacol Exp Ther 2010; 333:903-11. [PMID: 20215407 DOI: 10.1124/jpet.109.165274] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Cisplatin [cis-diamminedichloroplatinum(II)]/oxaliplatin [1,2-diamminocyclohexane(trans-1)oxolatoplatinum(II)] toxicity is enhanced by functional gap junctions between treated cells, implying that inhibition of gap junctions may decrease cytotoxic activity of these platinum-based agents. This study investigates the effect of gap junction modulation by cisplatin/oxaliplatin on cytotoxicity in a transformed cell line. The effects were explored using junctional channels expressed in transfected HeLa cells and purified hemichannels. Junctional channels showed a rapid, dose-dependent decrease in dye coupling with exposure to cisplatin/oxaliplatin. With longer exposure, both compounds also decreased connexin expression. Both compounds inhibit the activity of purified connexin hemichannels, over the same concentration range that they inhibit junctional dye permeability, demonstrating that inhibition occurs by direct interaction of the drugs with connexin protein. Cisplatin/oxaliplatin reduced the clonogenic survival of HeLa cells at low density and high density in a dose-dependent manner, but to a greater degree at high density, consistent with a positive effect of gap junctional intercellular communication (GJIC) on cytotoxicity. Reduction of GJIC by genetic or pharmacological means decreased cisplatin/oxaliplatin toxicity. At low cisplatin/oxaliplatin concentrations, where effects on connexin channels are minimal, the toxicity increased with increased cell density. However, higher concentrations strongly inhibited GJIC, and this counteracted the enhancing effect of greater cell density on toxicity. The present results indicate that inhibition of GJIC by cisplatin/oxaliplatin decreases their cytotoxicity. Direct inhibition of GJIC and reduction of connexin expression by cisplatin/oxaliplatin may thereby compromise the effectiveness of these compounds and be a factor in the development of resistance to this class of chemotherapeutic agents.
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Affiliation(s)
- Qin Wang
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, People's Republic of China
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Vinken M, Doktorova T, Decrock E, Leybaert L, Vanhaecke T, Rogiers V. Gap junctional intercellular communication as a target for liver toxicity and carcinogenicity. Crit Rev Biochem Mol Biol 2009; 44:201-22. [PMID: 19635038 DOI: 10.1080/10409230903061215] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Direct communication between hepatocytes, mediated by gap junctions, constitutes a major regulatory platform in the control of liver homeostasis, ranging from hepatocellular proliferation to hepatocyte cell death. Inherent to this pivotal task, gap junction functionality is frequently disrupted upon impairment of the homeostatic balance, as occurs during liver toxicity and carcinogenicity. In the present paper, the deleterious effects of a number of chemical and biological toxic compounds on hepatic gap junctions are discussed, including environmental pollutants, biological toxins, organic solvents, pesticides, pharmaceuticals, peroxides, metals and phthalates. Particular attention is paid to the molecular mechanisms that underlie the abrogation of gap junction functionality. Since hepatic gap junctions are specifically targeted by tumor promoters and epigenetic carcinogens, both in vivo and in vitro, inhibition of gap junction functionality is considered as a suitable indicator for the detection of nongenotoxic hepatocarcinogenicity.
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Affiliation(s)
- Mathieu Vinken
- Department of Toxicology, Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium.
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He B, Tong X, Wang L, Wang Q, Ye H, Liu B, Hong X, Tao L, Harris AL. Tramadol and flurbiprofen depress the cytotoxicity of cisplatin via their effects on gap junctions. Clin Cancer Res 2009; 15:5803-10. [PMID: 19723651 DOI: 10.1158/1078-0432.ccr-09-0811] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Cancer patients are often concurrently treated with analgesics and antineoplastic drugs, yet the influence of analgesic agents on therapeutic activity of antineoplastic drugs is largely unexplored. This study investigates the effects of three commonly used analgesics, which produce analgesia by different mechanisms, on cytotoxicity induced by cisplatin, a widely used antitumor agent, and the relation between those effects and modulation of gap junction function by the analgesics. EXPERIMENTAL DESIGN The role of gap junctions in the modulation of cisplatin toxicity is explored by manipulation of connexin expression, and gap junction presence and function, using clinically relevant concentrations of the analgesics and cisplatin. RESULTS Short-term exposure of transformed cells to cisplatin reduced the clonogenic survival in low-density cultures (without gap junction formation) and in high density (with gap junction formation), but the toxic effect was greater at high density. In the absence of connexin expression or with block of connexin channels, cell density had no effect on cisplatin toxicity. Tramadol and flurbiprofen, but not morphine, significantly reduced cisplatin cytotoxicity, but this effect required functional gap junctions between the cells. Tramadol and flurbiprofen inhibited dye-coupling through gap junctions, but morphine did not. CONCLUSIONS The results suggest that the density dependence of cisplatin toxicity is mediated by gap junctions. They further indicate that tramadol and flurbiprofen depress cisplatin cytotoxicity through inhibition of gap junction activity, and more generally, that agents that depress junctional communication can counteract the effects of antitumor agents.
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Affiliation(s)
- Bo He
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, People's Republic of China
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Abstract
Head and neck tumors are one of the major public health problem all over the world. Cellular response of larynx carcinoma to cisplatin (CDDP) chemotherapy occurs both in cell-interdependent and cell-autonomous pathways. In the first pathway, cytotoxic signal transduction is mediated via gap-junctional intercellular communication (GIJC). CDDP also influence tumor cell migration.The aim of this study was the analysis of the effect of CDDP (0.5 microg/ml and 1.5 microg/ml) on the gap-junction intercellular communication and motility, respectively, in two new cell cultures (RK33 and RK45) derived from human larynx carcinoma. The migration of RK45 cell line was slightly inhibited and RK33 not affected after the incubation with CDDP. Tumor cells incubation with CDDP resulted in farther LY migration through neighboring cells beyond monolayer wound than in control cultures.In conclusion, there is a relationship between intercellular communication via gap junctions and motility of laryngeal tumor cells after CDDP application.
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Abstract
Evidence is accumulating that some forms of cell death, like apoptosis, are not only governed by the complex interplay between extracellular and intracellular signals but are also strongly influenced by intercellular communicative networks. The latter is provided by arrays of channels consisting of connexin proteins, with gap junctions directly connecting the cytoplasm of neighboring cells and hemichannels positioned as pores that link the cytoplasm to the extracellular environment. The role of gap junctions in cell death communication has received considerable interest and recently hemichannels have joined in as potentially toxic pores adding their part to the cell death process. However, despite a large body of existing evidence, especially for gap junctions, the exact contribution of the connexin channel family still remains controversial, as both gap junctions and hemichannels may furnish cell death as well as cell survival signals. An additional layer of complexity is formed by the fact that connexin proteins as such, beyond their channel function, may influence the cell death process. We here review the current knowledge on connexins and their channels in cell death and specifically address the molecular mechanisms that underlie connexin-related signaling. We also briefly focus on pannexins, a novel set of connexin-like proteins that have been implicated in cellular responses to pathological insults.
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Vinken M, Henkens T, De Rop E, Fraczek J, Vanhaecke T, Rogiers V. Biology and pathobiology of gap junctional channels in hepatocytes. Hepatology 2008; 47:1077-88. [PMID: 18058951 DOI: 10.1002/hep.22049] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The present review provides the state of the art of the current knowledge concerning gap junctional channels and their roles in liver functioning. In the first part, we summarize some relevant biochemical properties of hepatic gap junctional channels, including their structure and regulation. In the second part, we discuss the involvement of gap junctional channels in the occurrence of liver cell growth, liver cell differentiation, and liver cell death. We further exemplify their relevance in hepatic pathophysiology. Finally, a number of directions for future liver gap junctional channel research are proposed, and the up-regulation of gap junctional channel activity as a novel strategy in (liver) cancer therapy is illustrated.
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Affiliation(s)
- Mathieu Vinken
- Department of Toxicology, Vrije Universiteit Brussel, Laarbeeklaan 103, B-1090 Brussels, Belgium.
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