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Niechoda A, Roslan J, Maciorowska K, Rosłan M, Ejsmont K, Holownia A. Oxidative stress and activation of H2A.X in lung alveolar epithelial cells (A549) by nanoparticulate carbon black. Respir Physiol Neurobiol 2023; 316:104140. [PMID: 37586603 DOI: 10.1016/j.resp.2023.104140] [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: 05/19/2023] [Revised: 08/06/2023] [Accepted: 08/13/2023] [Indexed: 08/18/2023]
Abstract
Fine airborne particulate matter enter the respiratory system, induce oxidative stress and initiate DNA damage. The aim of our study was the estimation of cell viability, oxidative stress, DNA damage, cell cycle alterations and activation of histone H2A.X. Experiments were done on lung alveolar epithelial (A549) cells grown for 24 h with 200 µg mL-1 coarse carbon black (CB), or nanoparticulate CB (NPCB). Neither CB nor glutathione depletion altered cell viability, growth rates, and H2A.X expression while NPCB decreased cell viability, increased oxidative stress and DNA damage. The cell cycle was blocked at G0/G1. NPCB but not CB increased expression and activation of H2A.X at mRNA and protein levels. Co-expression data point to γH2A.X as a major NPCB target, and show the interdependence of γH2A.X and oxidative stress. We conclude, that NPCB increases γ-H2A.X expression in A549 cells at mRNA and protein levels and stimulates H2A.X (Ser139), phosphorylation, associated with oxidative stress, the DNA damage response and G1 cell cycle arrest.
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Affiliation(s)
- A Niechoda
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, Bialystok 15-222, Poland
| | - J Roslan
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, Bialystok 15-222, Poland
| | - K Maciorowska
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, Bialystok 15-222, Poland
| | - M Rosłan
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, Bialystok 15-222, Poland
| | - K Ejsmont
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, Bialystok 15-222, Poland
| | - A Holownia
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, Bialystok 15-222, Poland.
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Pragya SU, Pragya SC, Griswold AJ, Gu E, Mehta ND, Uddin P, Veeramachaneni P, Mehta N, Mehta D, Abomoelak B. Preksha Dhyāna Meditation Effect on the DNA Methylation Signature in College Students. JOURNAL OF INTEGRATIVE AND COMPLEMENTARY MEDICINE 2023; 29:224-233. [PMID: 36749149 DOI: 10.1089/jicm.2022.0713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Introduction: The stress and psychological factors affect the human transcriptomic and epigenomic landscapes. Preksha Dhyana meditation (PM) was found to be effective, in novice healthy college student meditators, at the cognitive skills and transcriptomic levels. Recently published data showed that PM induced alterations at the transcriptome level in healthy and novice college students. Methods: To decipher potential mechanisms underlying the PM effect at the cellular level, array-based methylation analyses in peripheral blood were performed at baseline and 8 weeks postintervention in 34 participants. Results: Overall, 470 CpG sites were nominally differentially methylated (p ≤ 0.05 and change magnitude from ≥3% to ≤ -3%) between baseline and 8 weeks postintervention with 180 sites hypermethylated and 290 sites hypomethylated. Pathway analysis of the genes linked to the differentially methylated sites revealed the enrichment of several molecular and cellular signaling pathways, especially metabolic and brain function signaling pathways. Conclusions: Besides its beneficial effects on cognitive skills and transcriptome alterations, the current data indicate that PM meditation also affects the DNA methylation profile of novice and healthy college students 8 weeks postintervention. Clinical Trial Registration number: NCT03779269.
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Affiliation(s)
- Samani U Pragya
- Department of Religions and Philosophies, University of London, London, United Kingdom
| | - Samani C Pragya
- Department of Biostatistics, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, USA
| | - Anthony J Griswold
- John P. Hussman Institute for Human Genomics, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Esther Gu
- John P. Hussman Institute for Human Genomics, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Neelam D Mehta
- Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | - Parvin Uddin
- College of Arts, Sciences and Education, Florida International University, Miami, FL, USA
| | | | - Naina Mehta
- Neurodevelopmental Pediatrician, Behavioral and Developmental Center, Orlando Health, Orlando, FL, USA
| | - Devendra Mehta
- Gastrointestinal Translational Laboratory, Arnold Palmer Hospital for Children, Orlando, FL, USA
| | - Bassam Abomoelak
- Gastrointestinal Translational Laboratory, Arnold Palmer Hospital for Children, Orlando, FL, USA
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Abstract
ABSTRACT Cancers exhibit differences in metastatic behavior and drug sensitivity that correlate with certain tumor-specific variables such as differentiation grade, growth rate/extent and molecular regulatory aberrations. In practice, patient management is based on the past results of clinical trials adjusted for these biomarkers. Here, it is proposed that treatment strategies could be fine-tuned upfront simply by quantifying tumorigenic spatial (cell growth) and temporal (genetic stability) control losses, as predicted by genetic defects of cell-cycle-regulatory gatekeeper and genome-stabilizing caretaker tumor suppressor genes, respectively. These differential quantifications of tumor dysfunction may in turn be used to create a tumor-specific ‘periodic table’ that guides rational formulation of survival-enhancing anticancer treatment strategies.
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Affiliation(s)
- Richard J Epstein
- *Clinical Informatics & Research Centre, The Kinghorn Cancer Centre, 370 Victoria St, Darlinghurst 2010, Sydney, Australia
- Laboratory of Genome Evolution, Garvan Institute for Medical Research, 384 Victoria St, Darlinghurst 2010, Sydney, Australia
- Department of Oncology, & UNSW Clinical School, St Vincent's Hospital, 390 Victoria St, Darlinghurst 2010 Sydney, Australia
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Leung WH, Vong QP, Lin W, Janke L, Chen T, Leung W. Modulation of NKG2D ligand expression and metastasis in tumors by spironolactone via RXRγ activation. ACTA ACUST UNITED AC 2013; 210:2675-92. [PMID: 24190430 PMCID: PMC3832934 DOI: 10.1084/jem.20122292] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The diuretic drug spironolactone up-regulates NKG2D ligand expression in colon cancer cells via activation of the ATM–Chk2–mediated checkpoint pathway to enhance the antitumor function of NK cells. Tumor metastasis and lack of NKG2D ligand (NKG2DL) expression are associated with poor prognosis in patients with colon cancer. Here, we found that spironolactone (SPIR), an FDA-approved diuretic drug with a long-term safety profile, can up-regulate NKG2DL expression in multiple colon cancer cell lines by activating the ATM–Chk2-mediated checkpoint pathway, which in turn enhances tumor elimination by natural killer cells. SPIR can also up-regulate the expression of metastasis-suppressor genes TIMP2 and TIMP3, thereby reducing tumor cell invasiveness. Although SPIR is an aldosterone antagonist, its antitumor effects are independent of the mineralocorticoid receptor pathway. By screening the human nuclear hormone receptor siRNA library, we identified retinoid X receptor γ (RXRγ) instead as being indispensable for the antitumor functions of SPIR. Collectively, our results strongly support the use of SPIR or other RXRγ agonists with minimal side effects for colon cancer prevention and therapy.
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Affiliation(s)
- Wai-Hang Leung
- Department of Bone Marrow Transplantation and Cellular Therapy; 2 Department of Chemical Biology & Therapeutics; and 3 Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
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The novel arsenical Darinaparsin circumvents BRG1-dependent, HO-1-mediated cytoprotection in leukemic cells. Leukemia 2013; 27:2220-8. [PMID: 23426167 DOI: 10.1038/leu.2013.54] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 02/04/2013] [Accepted: 02/11/2013] [Indexed: 12/30/2022]
Abstract
Darinaparsin (Dar) is a more potent cytotoxic arsenical than arsenic trioxide (ATO). We hypothesized that the increased cytotoxicity of Dar may be because of a decreased cytoprotective response. We observed that, unlike ATO, Dar does not induce heme oxygenase-1 (HO-1), even though it induces expression of other nuclear factor (erythroid-derived 2)-like 2 (NRF2)-dependent detoxifying enzymes to a greater extent than ATO, in both cancer cell lines and patient-derived leukemic cells. This strengthens the emerging evidence, showing that response to reactive oxygen species (ROS) is stimuli specific. Dar treatment prevents recruitment of the transcriptional coregulator Brahma-related gene 1 (BRG1) to the HMOX1 promoter, which is required for HMOX1 expression. The inability of Dar to induce HO-1 correlates with arrest in G2/M cell cycle phase and BRG1 phosphorylation. Inhibition of HO-1 increases the toxicity of ATO, but has no effect on Dar-induced apoptosis. Accordingly, the lack of HO-1 induction is involved in Dar's enhanced antileukemic properties. Our data highlight cytoprotective responses mediated by HO-1 and BRG1 as a novel target for enhancing the therapeutic range of arsenicals.
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Pampeno C, Hurtado A, Meruelo D. ATM kinase is activated by sindbis viral vector infection. Virus Res 2012; 166:97-102. [PMID: 22475743 DOI: 10.1016/j.virusres.2012.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2011] [Revised: 03/12/2012] [Accepted: 03/13/2012] [Indexed: 11/27/2022]
Abstract
Sindbis virus is a prototypic member of the Alphavirus genus, Togaviridae family. Sindbis replication results in cellular cytotoxicity, a feature that has been exploited by our laboratory for treatment of in vivo tumors. Understanding the interactions between Sindbis vectors and the host cell can lead to better virus production and increased efficacy of gene therapy vectors. Here we present studies investigating a possible cellular response to genotoxic effects of Sindbis vector infection. The Ataxia Telangiectasia Mutated (ATM) kinase, a sentinel against genomic and cellular stress, was activated by Sindbis vector infection at 3h post infection. ATM substrates, Mcm3 and the γH2AX histone, were subsequently phosphorylated, however, substrates involved with checkpoint arrest of DNA replication, p53, Chk1 and Chk2, were not differentially phosphorylated compared with uninfected cells. The ATM response suggests nuclear pertubation, resulting from cessation of host protein synthesis, as an early event in Sindbis vector infection.
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Affiliation(s)
- Christine Pampeno
- Gene Therapy Center, Cancer Institute and Department of Pathology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, United States
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Zanellato I, Heldt JM, Vessières A, Jaouen G, Osella D. Antiproliferative effect of ferrocifen drug candidates on malignant pleural mesothelioma cell lines. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2009.05.047] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hoffmann EK, Lambert IH, Pedersen SF. Physiology of cell volume regulation in vertebrates. Physiol Rev 2009; 89:193-277. [PMID: 19126758 DOI: 10.1152/physrev.00037.2007] [Citation(s) in RCA: 1014] [Impact Index Per Article: 67.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The ability to control cell volume is pivotal for cell function. Cell volume perturbation elicits a wide array of signaling events, leading to protective (e.g., cytoskeletal rearrangement) and adaptive (e.g., altered expression of osmolyte transporters and heat shock proteins) measures and, in most cases, activation of volume regulatory osmolyte transport. After acute swelling, cell volume is regulated by the process of regulatory volume decrease (RVD), which involves the activation of KCl cotransport and of channels mediating K(+), Cl(-), and taurine efflux. Conversely, after acute shrinkage, cell volume is regulated by the process of regulatory volume increase (RVI), which is mediated primarily by Na(+)/H(+) exchange, Na(+)-K(+)-2Cl(-) cotransport, and Na(+) channels. Here, we review in detail the current knowledge regarding the molecular identity of these transport pathways and their regulation by, e.g., membrane deformation, ionic strength, Ca(2+), protein kinases and phosphatases, cytoskeletal elements, GTP binding proteins, lipid mediators, and reactive oxygen species, upon changes in cell volume. We also discuss the nature of the upstream elements in volume sensing in vertebrate organisms. Importantly, cell volume impacts on a wide array of physiological processes, including transepithelial transport; cell migration, proliferation, and death; and changes in cell volume function as specific signals regulating these processes. A discussion of this issue concludes the review.
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Affiliation(s)
- Else K Hoffmann
- Department of Biology, University of Copenhagen, Copenhagen, Denmark.
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