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Moghimi V, Rahvarian J, Esmaeilzadeh Z, Mohammad-Pour N, Babaki D, Sadeghifar F, Esfehani RJ, Bidkhori HR, Roshan NM, Momeni-Moghaddam M, Naderi-Meshkin H. Adipose-derived human mesenchymal stem cells seeded on denuded or stromal sides of the amniotic membrane improve angiogenesis and collagen remodeling and accelerate healing of the full-thickness wound. Acta Histochem 2023; 125:152027. [PMID: 37062121 DOI: 10.1016/j.acthis.2023.152027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 04/06/2023] [Accepted: 04/08/2023] [Indexed: 04/18/2023]
Abstract
Several strategies have been proposed to enhance wound healing results. Along with other forms of wound dressing, the human amniotic membrane (HAM) has long been regarded as a biological wound dressing that decreases infection and enhances healing. This study investigates the feasibility and effectiveness of wound healing using decellularized HAM (dAM) and stromal HAM (sAM) in combination with adipose-derived human mesenchymal stem cells (AdMSCs). The dAM and sAM sides of HAM were employed as wound dressing scaffolds, and AdMSCs were seeded on top of either dAM or sAM. Sixty healthy Wistar rats were randomly divided into three groups: untreated wound, dAM/AdMSCs group, and sAM/AdMSCs group. The gene expression of VEGF and COL-I was measured in vitro. Wound healing was examined after wounding on days 3, 7, 14, and 21. The expression level of VEGF was significantly higher in sAM/AdMSCs than dAM/AdMSCs (P ≤ 0.05), but there was no significant difference in COL-I expression (P ≥ 0.05). In vivo research revealed that on day 14, wounds treated with sAM/AdMSCs had more vascularization than wounds treated with dAM/AdMSCs (P ≤ 0.01) and untreated wound groups on days 7 (P ≤ 0.05) and 14 (P ≤ 0.0001), respectively. On days 14 (P < 0.05 for sAM/AdMSCs, P < 0.01 for dAM/AdMSCs), and 21 (P < 0.05 for sAM/AdMSCs, P < 0.01 for dAM/AdMSCs), the collagen deposition in the wound bed was significantly thicker in the sAM/AdMSCs and dAM/AdMSCs groups compared to untreated wounds. The study demonstrated that the combination of sAM and AdMSCs promotes wound healing by enhancing angiogenesis and collagen remodeling.
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Affiliation(s)
- Vahid Moghimi
- Stem Cells and Regenerative Medicine Department, Academic Center for Education, Culture and Research (ACECR), Khorasan Razavi Branch, Mashhad, Iran; Department of Biology, Faculty of Science, Hakim Sabzevari University, Sabzevar, Iran
| | - Jeiran Rahvarian
- Stem Cells and Regenerative Medicine Department, Academic Center for Education, Culture and Research (ACECR), Khorasan Razavi Branch, Mashhad, Iran; Department of Clinical Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Zohreh Esmaeilzadeh
- Stem Cells and Regenerative Medicine Department, Academic Center for Education, Culture and Research (ACECR), Khorasan Razavi Branch, Mashhad, Iran
| | - Najmeh Mohammad-Pour
- Stem Cells and Regenerative Medicine Department, Academic Center for Education, Culture and Research (ACECR), Khorasan Razavi Branch, Mashhad, Iran; Department of Biology, Faculty of Science, Hakim Sabzevari University, Sabzevar, Iran
| | - Danial Babaki
- Curriculum in Genetics and Molecular Biology, The University of North Carolina at Chapel Hill, Chapel Hill, USA
| | - Fatemeh Sadeghifar
- Department of Biology, Faculty of Science, Hakim Sabzevari University, Sabzevar, Iran
| | - Reza Jafarzadeh Esfehani
- Stem Cells and Regenerative Medicine Department, Academic Center for Education, Culture and Research (ACECR), Khorasan Razavi Branch, Mashhad, Iran; Blood Borne Infections Research Center, Academic Center for Education, Culture and Research (ACECR)- Khorasan Razavi, Mashhad, Iran
| | - Hamid Reza Bidkhori
- Stem Cells and Regenerative Medicine Department, Academic Center for Education, Culture and Research (ACECR), Khorasan Razavi Branch, Mashhad, Iran; Blood Borne Infections Research Center, Academic Center for Education, Culture and Research (ACECR)- Khorasan Razavi, Mashhad, Iran
| | | | | | - Hojjat Naderi-Meshkin
- Stem Cells and Regenerative Medicine Department, Academic Center for Education, Culture and Research (ACECR), Khorasan Razavi Branch, Mashhad, Iran; Wellcome-Wolfson Institute for Experimental Medicine, Belfast, UK.
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Ongchuan Martin S, Sadeghifar F, Snively BM, Alexander H, Kimball J, Conner K, O'Donovan CA, Munger Clary HM. Positive anxiety or depression screen despite ongoing antidepressant prescription in people with epilepsy: A large cross-sectional analysis. Epilepsy Behav Rep 2022; 20:100572. [PMID: 36411879 PMCID: PMC9674492 DOI: 10.1016/j.ebr.2022.100572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Revised: 10/30/2022] [Accepted: 11/05/2022] [Indexed: 11/09/2022] Open
Abstract
Purpose While antidepressants are recommended to manage anxiety or depression in epilepsy, limited effectiveness data exist in real-world epilepsy samples, and prior work indicated frequent positive screens despite antidepressant prescription. In response, this study evaluates factors associated with positive anxiety or depression screen during ongoing antidepressant prescription. Methods Clinical and sociodemographic characteristics were collected among consecutive adult epilepsy clinic patients completing validated anxiety and depression instruments. The sample was divided by presence vs absence of existing antidepressant prescription at time of screening. Among those on an antidepressant, multivariable logistic regression was performed on pre-selected characteristics to evaluate for association with positive anxiety and/or depression screen. Pre-selected characteristics included: antidepressant dose, antidepressant prescriber specialty, antiseizure medications (number, potential psychotropic effects), seizure frequency, employment, visit no-shows, and medical insurance. Results Of 563 people with epilepsy, 152 had evidence of antidepressant prescription at time of screening and 73/152(48%) had positive anxiety and/or depression screen. Multivariable modeling demonstrated low antidepressant dose and no-show visit(s) were associated with positive screens (adjusted OR 2.29, CI 1.00-5.48 and 3.11, 1.26-8.22 respectively). Conclusion Low antidepressant dose and factors potentially associated with adherence (visit no-shows) may contribute to persistent anxiety and/or depression among epilepsy patients on an antidepressant.
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Affiliation(s)
| | - Fatemeh Sadeghifar
- Department of Neurology, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - Beverly M Snively
- Department of Biostatistics and Data Science, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - Halley Alexander
- Department of Neurology, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - James Kimball
- Department of Psychiatry, Wake Forest Unversity School of Medicine, Winston-Salem, NC, USA
| | - Kelly Conner
- Department of Neurology, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - Cormac A O'Donovan
- Department of Neurology and Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - Heidi M Munger Clary
- Department of Neurology, Wake Forest University School of Medicine, Winston-Salem, NC, USA
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3
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Munger Clary HM, Croxton RD, Snively BM, Brenes GA, Lovato J, Sadeghifar F, Kimball J, O'Donovan C, Conner K, Kim E, Allan J, Duncan P. Neurologist prescribing versus psychiatry referral: Examining patient preferences for anxiety and depression management in a symptomatic epilepsy clinic sample. Epilepsy Behav 2021; 114:107543. [PMID: 33246893 PMCID: PMC7855561 DOI: 10.1016/j.yebeh.2020.107543] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 09/18/2020] [Accepted: 09/28/2020] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Anxiety and depression symptoms in epilepsy are common, impactful and under-recognized and undertreated. While prior survey data suggests equipoise among epileptologists for managing anxiety and/or depression via prescribing in the epilepsy clinic versus psychiatry referral, patient preferences are unknown and should potentially influence practice habits among epileptologists. Thus, the primary objective of this study was to determine patient preference for anxiety and/or depression prescribing by neurologists versus psychiatry referral among an adult epilepsy clinic sample of symptomatic patients. METHODS Management preferences for anxiety and/or depression were surveyed in an adult tertiary care epilepsy clinic. Individuals who screened positive for anxiety and/or depression symptoms on validated instruments during a routine care-embedded learning health system study were recruited. Demographics, social variables, psychiatric treatment history, and treatment priorities and preferences were surveyed. Preference was defined as a slightly greater than 2:1 ratio in favor neurology prescribing or psychiatry referral. The study was powered to assess this primary objective using a two-sample binomial test. Multinomial logistic regression examined an a priori multivariable model of treatment preference (secondary objective). RESULTS The study sample included N = 63 symptomatic adults, with 64% women and mean age 42.2 years. Most reported past or current treatment for anxiety and/or depression, and treatment for these symptoms was a high or moderate priority among 65.1% of the sample. Neurologist prescribing was preferred in 83.0% (nearly 5:1) over psychiatry referral among those who chose neurology or psychiatry (as opposed to neither of the two; p < 0.001, 95% CI 0.702-0.919). Overall, 69.8% of the total study sample preferred neurology prescribing. Multivariable modeling indicated preference for neither management option (compared with neurologist prescribing) was associated with low overall treatment prioritization and having never received neurologist medication management. None of the factors examined in the a priori multivariable model were associated with selecting psychiatry referral (compared to neurologist prescribing). CONCLUSION In this sample, most patients indicated a preference for neurologists to prescribe for anxiety or depression symptoms in the epilepsy clinic. Care models involving neurologist prescribing for anxiety and depression symptoms merit further investigation and potential adoption in clinical practice.
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Affiliation(s)
- Heidi M Munger Clary
- Department of Neurology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Rachel D Croxton
- Department of Neurology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Beverly M Snively
- Department of Biostatistics and Data Science, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Gretchen A Brenes
- Department of Internal Medicine, Section on Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - James Lovato
- Department of Biostatistics and Data Science, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Fatemeh Sadeghifar
- Department of Neurology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - James Kimball
- Department of Psychiatry, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Cormac O'Donovan
- Department of Neurology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Kelly Conner
- Department of Neurology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Esther Kim
- Department of Neurology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Jonathan Allan
- Department of Psychiatry, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Pamela Duncan
- Department of Neurology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
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Mayvaneh F, Entezari A, Sadeghifar F, Baaghideh M, Guo Y, Atabati A, Zhao Q, Zhang Y. Exposure to suboptimal ambient temperature during specific gestational periods and adverse outcomes in mice. Environ Sci Pollut Res Int 2020; 27:45487-45498. [PMID: 32789805 DOI: 10.1007/s11356-020-10416-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Accepted: 08/05/2020] [Indexed: 06/11/2023]
Abstract
Exposure to suboptimal ambient temperature during pregnancy has been reported as a potential teratogen of fetal development. However, limited animal evidence is available regarding the impact of extreme temperatures on maternal pregnancy and the subsequent adverse pregnancy outcomes. Our objective in this study is to investigate the relationship between temperature and maternal stress during pregnancy in mice. This study used the Naval Medical Research Institute (NMRI) mice during the second and third pregnant weeks with the gestational day (GD) (GD 6.5-14.5 and GD 14.5-17.5). Mice were exposed to suboptimal ambient temperature (1 °C, 5 °C, 10 °C, 15 °C, 40 °C, 42 °C, 44 °C, 46 °C, and 48 °C for the experimental group and 23 °C for the control group) 1 h per day, 7 days a weekin each trimester. Measurements of placental development (placental weight [PW] and placental diameter [PD]) and fetal growth (fetal weight [FW] and crown-to-rump length [CRL]) between experimental and control groups were compared using analysis of variance (ANOVA). Data on the occurrence of preterm birth (PTB) and abnormalities were also collected. The results showed that exposure to both cold and heat stress in the second and third weeks of pregnancy caused significant decreases in measurements of placental development (PW and PD) and fetal growth (FW and CRL). For all temperature exposures, 15 °C was identified as the optimal temperature in the development of the embryo. Most PTB occurrences were observed in high-temperature stress groups, with the highest PTB number seen in the exposure group at 48 °C, whereas PTB occurred only at 1 °C among cold stress groups. In the selected exposure experiments, an approximate U-shaped relation was observed between temperature and number of abnormality occurrence. The highest percentage of these anomalies occurred at temperatures of 1 °C and 48 °C, while no abnormalities were observed at 15 °C and in the control group. Our findings strengthened the evidence that exposure to suboptimal ambient temperatures may trigger adverse pregnancy outcomes and worsen embryo and fetal development in mice.
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Affiliation(s)
- Fatemeh Mayvaneh
- Faculty of Geography and Environmental Sciences, Hakim Sabzevari University, Khorasan Razavi, Sabzevar, 9617916487, Iran
| | - Alireza Entezari
- Faculty of Geography and Environmental Sciences, Hakim Sabzevari University, Khorasan Razavi, Sabzevar, 9617916487, Iran.
| | - Fatemeh Sadeghifar
- Department of Science, Hakim Sabzevari University, Khorasan Razavi, Sabzevar, 9617916487, Iran
| | - Mohammad Baaghideh
- Faculty of Geography and Environmental Sciences, Hakim Sabzevari University, Khorasan Razavi, Sabzevar, 9617916487, Iran
| | - Yuming Guo
- Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, Australia
| | - Azadeh Atabati
- Faculty of Geography and Environmental Sciences, Hakim Sabzevari University, Khorasan Razavi, Sabzevar, 9617916487, Iran
| | - Qi Zhao
- Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, Australia
| | - Yunquan Zhang
- Department of Epidemiology and Biostatistics, School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, 430065, China.
- Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, 430065, China.
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5
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Rolicka A, Guo Y, Gañez Zapater A, Tariq K, Quin J, Vintermist A, Sadeghifar F, Arsenian-Henriksson M, Östlund Farrants AK. The chromatin-remodeling complexes B-WICH and NuRD regulate ribosomal transcription in response to glucose. FASEB J 2020; 34:10818-10834. [PMID: 32598531 DOI: 10.1096/fj.202000411r] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 05/26/2020] [Accepted: 06/04/2020] [Indexed: 12/20/2022]
Abstract
Regulation of ribosomal transcription is under tight control from environmental stimuli, and this control involves changes in the chromatin structure. The underlying mechanism of how chromatin changes in response to nutrient and energy supply in the cell is still unclear. The chromatin-remodeling complex B-WICH is involved in activating the ribosomal transcription, and we show here that knock down of the B-WICH component WSTF results in cells that do not respond to glucose. The promoter is less accessible, and RNA pol I and its transcription factors SL1/TIF-1B and RRN3/TIF-1A, as well as the proto-oncogene c-MYC and the activating deacetylase SIRT7 do not bind upon glucose stimulation. In contrast, the repressive chromatin state that forms after glucose deprivation is reversible, and RNA pol I factors are recruited. WSTF knock down results in an accumulation of the ATPase CHD4, a component of the NuRD chromatin remodeling complex, which is responsible for establishing a repressive poised state at the promoter. The TTF-1, which binds and affect the binding of the chromatin complexes, is important to control the association of activating chromatin component UBF. We suggest that B-WICH is required to allow for a shift to an active chromatin state upon environmental stimulation, by counteracting the repressive state induced by the NuRD complex.
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Affiliation(s)
- Anna Rolicka
- Department of Molecular Biosciences, The Wenner-Gren Institute, The Arrhenius Lab F4, Stockholm University, Stockholm, Sweden
| | - Yuan Guo
- Department of Molecular Biosciences, The Wenner-Gren Institute, The Arrhenius Lab F4, Stockholm University, Stockholm, Sweden
| | - Antoni Gañez Zapater
- Department of Molecular Biosciences, The Wenner-Gren Institute, The Arrhenius Lab F4, Stockholm University, Stockholm, Sweden
| | - Kanwal Tariq
- Department of Molecular Biosciences, The Wenner-Gren Institute, The Arrhenius Lab F4, Stockholm University, Stockholm, Sweden
| | - Jaclyn Quin
- Department of Molecular Biosciences, The Wenner-Gren Institute, The Arrhenius Lab F4, Stockholm University, Stockholm, Sweden
| | - Anna Vintermist
- Department of Molecular Biosciences, The Wenner-Gren Institute, The Arrhenius Lab F4, Stockholm University, Stockholm, Sweden
| | - Fatemeh Sadeghifar
- Department of Molecular Biosciences, The Wenner-Gren Institute, The Arrhenius Lab F4, Stockholm University, Stockholm, Sweden
| | - Marie Arsenian-Henriksson
- Department of Microbiology, Tumor and Cell Biology (MTC), Biomedicum B7, Karolinska Institutet, Stockholm, Sweden
| | - Ann-Kristin Östlund Farrants
- Department of Molecular Biosciences, The Wenner-Gren Institute, The Arrhenius Lab F4, Stockholm University, Stockholm, Sweden
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Sadeghifar F, Penry VB. Mechanisms and Uses of Dietary Therapy as a Treatment for Epilepsy: A Review. Glob Adv Health Med 2019; 8:2164956119874784. [PMID: 31548917 PMCID: PMC6743206 DOI: 10.1177/2164956119874784] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 03/26/2019] [Accepted: 07/18/2019] [Indexed: 11/20/2022] Open
Abstract
One-third of patients with epilepsy do not respond to antiepileptic drugs and may
seek complementary and alternative treatment modalities. Dietary therapies such
as the ketogenic diet (KD), the modified Atkins, the medium-chain triglyceride,
and the low glycemic index diet have been successfully implemented in some forms
of epilepsy and are growing in utilization. The KD is a high-fat, low-protein,
low-carbohydrate diet that has been used for various conditions for over a
century. Insights into the mechanism of action of these diets may provide more
targeted interventions for patients with epilepsy. Knowledge of these mechanisms
is growing and includes neuroprotective effects on oxidative stress,
neuroinflammation, potassium channels in the brain, and mitochondrial
function.
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Affiliation(s)
| | - Vanessa Baute Penry
- Department of Neurology, Wake Forest School of Medicine, Winston-Salem, North Carolina
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Baute V, Zelnik D, Curtis J, Sadeghifar F. Complementary and Alternative Medicine for Painful Peripheral Neuropathy. Curr Treat Options Neurol 2019; 21:44. [DOI: 10.1007/s11940-019-0584-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Fatemi M, Mollania N, Momeni-Moghaddam M, Sadeghifar F. The anti-bacterial effects of magnetic iron oxide nanoparticles produced by biological method and the kinetic study of mortality of common strains in clinical infections. nbr 2019. [DOI: 10.29252/nbr.6.1.30] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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9
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Fatemi M, Mollania N, Momeni-Moghaddam M, Sadeghifar F. Extracellular biosynthesis of magnetic iron oxide nanoparticles by Bacillus cereus strain HMH1: Characterization and in vitro cytotoxicity analysis on MCF-7 and 3T3 cell lines. J Biotechnol 2018; 270:1-11. [PMID: 29407416 DOI: 10.1016/j.jbiotec.2018.01.021] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 01/02/2018] [Accepted: 01/26/2018] [Indexed: 02/01/2023]
Abstract
Discovery of new properties and special functionalities at the nanoscale materials caused nanotechnology to become one of the leading parts in all sciences namely biology and medicine. Magnetic iron oxide nanoparticles (MIONPs) are among interesting nanomaterials in biomedical arena, which have attracted the attention of many researchers owing to their extensive capabilities. Due to the simple, cost-effective and environmentally-friendly production processes, biosynthesis is of paramount importance between different methods of nanoparticles production. In the current study, we succeeded to synthesize MIONPs using a newly extracted bacteria supernatant. Produced nanoparticles were characterized using FE-SEM, DLS, VSM, UV-vis, FT-IR and EDS spectroscopy. Analysis showed that the average particle size of very stable spherical MIONPs is about 29.3 nm. The bacteria protein profile obtained by SDS-PAGE analysis indicated induction of different proteins. In vitro cytotoxicity of nanoparticles on the viability of MCF7 and 3T3 cell lines was assessed by MTT assay. The results show that toxicity of the produced nanoparticles (IC50, MCF-7 > 5 mg/ml and IC50, 3T3 > 7.5 mg/ml) follows a concentration dependent manner.
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Affiliation(s)
- Mohsen Fatemi
- Department of Biology, Faculty of Basic Sciences, Hakim Sabzevari University, Sabzevar 96179-76487, Iran.
| | - Nasrin Mollania
- Department of Biology, Faculty of Basic Sciences, Hakim Sabzevari University, Sabzevar 96179-76487, Iran.
| | - Majid Momeni-Moghaddam
- Department of Biology, Faculty of Basic Sciences, Hakim Sabzevari University, Sabzevar 96179-76487, Iran.
| | - Fatemeh Sadeghifar
- Department of Biology, Faculty of Basic Sciences, Hakim Sabzevari University, Sabzevar 96179-76487, Iran.
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Sadeghifar F, Böhm S, Vintermist A, Östlund Farrants AK. The B-WICH chromatin-remodelling complex regulates RNA polymerase III transcription by promoting Max-dependent c-Myc binding. Nucleic Acids Res 2015; 43:4477-90. [PMID: 25883140 PMCID: PMC4482074 DOI: 10.1093/nar/gkv312] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2014] [Accepted: 03/27/2015] [Indexed: 01/11/2023] Open
Abstract
The chromatin-remodelling complex B-WICH, comprised of William syndrome transcription factor, the ATPase SNF2h and nuclear myosin, specifically activates RNA polymerase III transcription of the 5S rRNA and 7SL genes. However, the underlying mechanism is unknown. Using high-resolution MN walking we demonstrate here that B-WICH changes the chromatin structure in the vicinity of the 5S rRNA and 7SL RNA genes during RNA polymerase III transcription. The action of B-WICH is required for the binding of the RNA polymerase machinery and the regulatory factors c-Myc at the 5S rRNA and 7SL RNA genes. In addition to the c-Myc binding site at the 5S genes, we have revealed a novel c-Myc and Max binding site in the intergenic spacer of the 5S rDNA. This region also contains a region remodelled by B-WICH. We demonstrate that c-Myc binds to both sites in a Max-dependent way, and thereby activate transcription by acetylating histone H3. The novel binding patterns of c-Myc and Max link transcription of 5S rRNA to the Myc/Max/Mxd network. Since B-WICH acts prior to c-Myc and other factors, we propose a model in which the B-WICH complex is required to maintain an open chromatin structure at these RNA polymerase III genes. This is a prerequisite for the binding of additional regulatory factors.
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Affiliation(s)
- Fatemeh Sadeghifar
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Sweden
| | - Stefanie Böhm
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Sweden
| | - Anna Vintermist
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Sweden
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11
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Sarshad A, Sadeghifar F, Louvet E, Mori R, Böhm S, Al-Muzzaini B, Vintermist A, Fomproix N, Östlund AK, Percipalle P. Nuclear myosin 1c facilitates the chromatin modifications required to activate rRNA gene transcription and cell cycle progression. PLoS Genet 2013; 9:e1003397. [PMID: 23555303 PMCID: PMC3605103 DOI: 10.1371/journal.pgen.1003397] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 02/04/2013] [Indexed: 11/18/2022] Open
Abstract
Actin and nuclear myosin 1c (NM1) cooperate in RNA polymerase I (pol I) transcription. NM1 is also part of a multiprotein assembly, B-WICH, which is involved in transcription. This assembly contains the chromatin remodeling complex WICH with its subunits WSTF and SNF2h. We report here that NM1 binds SNF2h with enhanced affinity upon impairment of the actin-binding function. ChIP analysis revealed that NM1, SNF2h, and actin gene occupancies are cell cycle-dependent and require intact motor function. At the onset of cell division, when transcription is temporarily blocked, B-WICH is disassembled due to WSTF phosphorylation, to be reassembled on the active gene at exit from mitosis. NM1 gene knockdown and motor function inhibition, or stable expression of NM1 mutants that do not interact with actin or chromatin, overall repressed rRNA synthesis by stalling pol I at the gene promoter, led to chromatin alterations by changing the state of H3K9 acetylation at gene promoter, and delayed cell cycle progression. These results suggest a unique structural role for NM1 in which the interaction with SNF2h stabilizes B-WICH at the gene promoter and facilitates recruitment of the HAT PCAF. This leads to a permissive chromatin structure required for transcription activation.
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Affiliation(s)
- Aishe Sarshad
- Department of Cell and Molecular Biology, Karolinska Institute, Stockholm, Sweden
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12
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Vintermist A, Böhm S, Sadeghifar F, Louvet E, Mansén A, Percipalle P, Östlund Farrants AK. The chromatin remodelling complex B-WICH changes the chromatin structure and recruits histone acetyl-transferases to active rRNA genes. PLoS One 2011; 6:e19184. [PMID: 21559432 PMCID: PMC3084792 DOI: 10.1371/journal.pone.0019184] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2010] [Accepted: 03/28/2011] [Indexed: 12/02/2022] Open
Abstract
The chromatin remodelling complex B-WICH, which comprises the William syndrome transcription factor (WSTF), SNF2h, and nuclear myosin 1 (NM1), is involved in regulating rDNA transcription, and SiRNA silencing of WSTF leads to a reduced level of 45S pre-rRNA. The mechanism behind the action of B-WICH is unclear. Here, we show that the B-WICH complex affects the chromatin structure and that silencing of the WSTF protein results in a compaction of the chromatin structure over a 200 basepair region at the rRNA promoter. WSTF knock down does not show an effect on the binding of the rRNA-specific enhancer and chromatin protein UBF, which contributes to the chromatin structure at active genes. Instead, WSTF knock down results in a reduced level of acetylated H3-Ac, in particular H3K9-Ac, at the promoter and along the gene. The association of the histone acetyl-transferases PCAF, p300 and GCN5 with the promoter is reduced in WSTF knock down cells, whereas the association of the histone acetyl-transferase MOF is retained. A low level of H3-Ac was also found in growing cells, but here histone acetyl-transferases were present at the rDNA promoter. We propose that the B-WICH complex remodels the chromatin structure at actively transcribed rRNA genes, and this allows for the association of specific histone acetyl-transferases.
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Affiliation(s)
- Anna Vintermist
- Department of Cell Biology, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
| | - Stefanie Böhm
- Department of Cell Biology, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
| | - Fatemeh Sadeghifar
- Department of Cell Biology, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
| | - Emilie Louvet
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Anethe Mansén
- Department of Cell Biology, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden
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Sabri N, Roth P, Xylourgidis N, Sadeghifar F, Adler J, Samakovlis C. Distinct functions of the Drosophila Nup153 and Nup214 FG domains in nuclear protein transport. ACTA ACUST UNITED AC 2007; 178:557-65. [PMID: 17682050 PMCID: PMC2064463 DOI: 10.1083/jcb.200612135] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The phenylanine-glycine (FG)–rich regions of several nucleoporins both bind to nuclear transport receptors and collectively provide a diffusion barrier to the nuclear pores. However, the in vivo roles of FG nucleoporins in transport remain unclear. We have inactivated 30 putative nucleoporins in cultured Drosophila melanogaster S2 cells by RNA interference and analyzed the phenotypes on importin α/β−mediated import and CRM1-dependent protein export. The fly homologues of FG nucleoporins Nup358, Nup153, and Nup54 are selectively required for import. The FG repeats of Nup153 are necessary for its function in transport, whereas the remainder of the protein maintains pore integrity. Inactivation of the CRM1 cofactor RanBP3 decreased the nuclear accumulation of CRM1 and protein export. We report a surprisingly antagonistic relationship between RanBP3 and the Nup214 FG region in determining CRM1 localization and its function in protein export. Our data suggest that peripheral metazoan FG nucleoporins have distinct functions in nuclear protein transport events.
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Affiliation(s)
- Nafiseh Sabri
- Department of Developmental Biology, Wenner-Gren Institute, Stockholm University, S-10691 Stockholm, Sweden
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