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BACKGROUND: The presence of neural precursor stem cells (NPSCs) in some parts of the adult brain and the potency of these types of cells with a therapeutic viewpoint, has opened up a new approach for the treatment and recovery of the defects of central nervous system (CNS). Quercetin, as an herbal flavonoid, has been extensively investigated and shown to have numerous restoratives, inhibitory, and protective effects on some cell-lines and disorders. The purpose of this study is to simultaneously investigate the effect of quercetin on the expression of the nuclear factor erythroid 2-related factor 2 (Nrf2) gene and the effect on the proliferation and differentiation of NPSCs derived from the subventricular zone (SVZ) of the brain of adult rats. METHODS AND RESULTS: The cell obtained from SVZ cultured for one week and treated with quercetin at the concentrations of 1, 5, and 15 µM to evaluate the Nrf2 expression, proliferation and differentiation of NSCs after one week. Cellular and genetic results was performed by RT-PCR, MTT assay test, quantification of images with Image-J and counting. The results indicated that the quercetin increases expression of Nrf2 at concentration above 5 µM. Also differentiation and proliferation rate of NSCs is affected by various concentrations of quercetin in a dose-dependent manner. CONCLUSION: These findings confirmed the dose-dependent effect of quercetin on proliferation and differentiation of cell. In addition, quercetin increased the expression of Nrf2 gene. By combining these two effects of quercetin, this substance can be considered an effective compound in the treatment of degenerative defects in CNS.
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Células-Madre Neurales , Quercetina , Ratas , Animales , Quercetina/farmacología , Quercetina/metabolismo , Factor 2 Relacionado con NF-E2/genética , Factor 2 Relacionado con NF-E2/metabolismo , Células-Madre Neurales/metabolismo , Diferenciación Celular , Ventrículos Laterales/metabolismo , Proliferación CelularRESUMEN
Exosomes are small extracellular vesicles that can be derived from human cells such as mesenchymal stem cells (MSCs). The size of exosomes is at nano-scale range and owing to their biocompatibility and other characteristics, they have been promising candidates for delivery of bioactive compounds and genetic materials in disease therapy, especially cancer therapy. Gastric cancer (GC) is a leading cause of death among patients and this malignant disease affects gastrointestinal tract that its invasiveness and abnormal migration mediate poor prognosis of patients. Metastasis is an increasing challenge in GC and microRNAs (miRNAs) are potential regulators of metastasis and related molecular pathways, especially epithelial-to-mesenchymal transition (EMT). In the present study, our aim was to explore role of exosomes in miR-200a delivery for suppressing EMT-mediated GC metastasis. Exosomes were isolated from MSCs via size exclusion chromatography. The synthetic miR-200a mimics were transfected into exosomes via electroporation. AGS cell line exposed to TGF-ß for EMT induction and then, these cells cultured with miR-200a-loaded exosomes. The transwell assays performed to evaluate GC migration and expression levels of ZEB1, Snail1 and vimentin measured. Exosomes demonstrated loading efficiency of 5.92 ± 4.6%. The TGF-ß treatment transformed AGS cells into fibroblast-like cells expressing two stemness markers, CD44 (45.28%) and CD133 (50.79%) and stimulated EMT. Exosomes induced a 14.89-fold increase in miR-200a expression in AGS cells. Mechanistically, miR-200a enhances E-cadherin levels (P < 0.01), while it decreases expression levels of ß-catenin (P < 0.05), vimentin (P < 0.01), ZEB1 (P < 0.0001) and Snail1 (P < 0.01), leading to EMT inhibition in GC cells. This pre-clinical experiment introduces a new strategy for miR-200a delivery that is of importance for preventing migration and invasion of GC cells.
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Exosomas , MicroARNs , Humanos , Transición Epitelial-Mesenquimal/genética , Factor de Crecimiento Transformador beta , Exosomas/metabolismo , Vimentina , Línea Celular Tumoral , MicroARNs/genética , MicroARNs/metabolismo , Proliferación Celular , Homeobox 1 de Unión a la E-Box con Dedos de Zinc/genética , Homeobox 1 de Unión a la E-Box con Dedos de Zinc/metabolismoRESUMEN
Alzheimer's disease (AD) is the most common type of cognitive disorder in an elderly population associated with the accumulation of amyloid plaques and neurofibrillary tangles. Nerolidol is assumed to have neuroprotection effects. This study aimed to investigate the therapeutic effects of nerolidol on the Aß-induced model of AD in rats. Hippocampal injection of Aß was used to induce AD. Animals were randomly divided into control, sham (received PBS as Aß solvent), AD, DNPZ (AD + donepezil, 4 weeks); NRD-50 (AD + nerolidol, 50 mg/kg, 4 weeks), NRD-100 (AD + nerolidol, 100 mg/kg, 4 weeks; Prot (rats which received 100 mg/kg nerolidol for two weeks before Aß administration), and Solv (AD + sunflower oil as nerolidol solvent, 4 weeks) groups. All rats were subjected to a memory behavioral passive avoidance test by shuttle box. Thioflavin-S staining was performed to confirm Aß plaque formation and measured using ImageJ analyzing program. BDNF and CREB-1 expressions were analyzed by immunohistochemistry assay. Aß induced AD by Aß plaques formation and increasing step-through latency time. It reduced the expression of BDNF and CREB-1 protein. Administration of nerolidol or donepezil improved these features by decreasing Aß and increasing BDNF and CREB-1 expression and latency time. Nerolidol is likely to provide protection against AD. It may prevent dementia through the mediation of BDNF-CREB-1 expression and cholinergic nerve cells restoring. It seems that the administration of nerolidol before the onset of the disease will be more effective than after.
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Enfermedad de Alzheimer , Fármacos Neuroprotectores , Anciano , Animales , Ratas , Humanos , Enfermedad de Alzheimer/tratamiento farmacológico , Enfermedad de Alzheimer/metabolismo , Ratas Wistar , Fármacos Neuroprotectores/farmacología , Fármacos Neuroprotectores/uso terapéutico , Péptidos beta-Amiloides/metabolismo , Factor Neurotrófico Derivado del Encéfalo/metabolismo , Factor Neurotrófico Derivado del Encéfalo/farmacología , Factor Neurotrófico Derivado del Encéfalo/uso terapéutico , Donepezilo/farmacología , Hipocampo , Solventes/efectos adversos , Solventes/metabolismo , Modelos Animales de EnfermedadRESUMEN
Tauopathies belong to a heterogeneous class of neuronal diseases resulting in the metabolic disturbance. A disulfide natural compound of Alpha-Lipoic acid (ALA) has shown numerous pharmacologic, antioxidant, and neuroprotective activities under neuropathological conditions. The aim of this study was to investigate the neuroprotective effects of ALA on the tauopathy-induced oxidative disturbance and behavioral deficits. The transgenic Drosophila model of tauopathy induced by human tauR406W using GAL4/UAS system and effects of ALA (0.001, 0.005, and 0.025 % w/w of diet) on the neuropathology of tau in younger (20 days) and older (30 days) adults were investigated via biochemical, molecular, behavioral and in-situ tissue analyses. Expression of apoptosis-related proteins involving Drosophila Cyt-c-d (trigger of intrinsic apoptosis) and DrICE (effector caspase) were upregulated in both ages (20 and 30 days) and DIAP1 (caspase inhibitor) has reduced only in older model flies compared to the controls. Remarkably, all doses of ALA increased DIAP1 and glutathione (GSH) as well as reducing Cyt-c-d and lipid peroxidation (LPO) in the younger flies compared to the model flies. Moreover, the higher doses of ALA were able to decrease thiol concentrations, to increase total antioxidant capacity, and to improve the behavioral deficits (locomotor function, olfactory memory, and ethanol sensitivity) in the younger flies. On the other hand, only a higher dose of ALA was able to decrease DrICE, Cyt-c-d, LPO, and thiol as well as increasing antioxidant capacity and decreasing ethanol sensitivity (ST50, RT50) in the older flies. TUNEL assay showed that all doses of ALA could potentially increase the DIAP1/DrICE ratio and exert anti-apoptotic effects on younger, but not on the older adults. Furthermore, data obtained from the in-situ ROS assay confirmed that only a higher dose of ALA significantly decreased the ROS level at both ages. Our data showed that an effective neuroprotective dose of ALA and its mechanism of action on this model of tauopathy could potentially be influenced by longevity. Moreover, it was shown that ALA prevents apoptosis and decreases the redox homeostasis, and this partially explains the mechanism by which ALA diminishes behavioral deficits.
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Caspasas/biosíntesis , Proteínas de Drosophila/biosíntesis , Proteínas Inhibidoras de la Apoptosis/biosíntesis , Locomoción/fisiología , Estrés Oxidativo/fisiología , Tauopatías/metabolismo , Ácido Tióctico/uso terapéutico , Factores de Edad , Animales , Animales Modificados Genéticamente , Antioxidantes/farmacología , Antioxidantes/uso terapéutico , Apoptosis/efectos de los fármacos , Apoptosis/fisiología , Caspasas/genética , Drosophila , Proteínas de Drosophila/genética , Femenino , Homeostasis/efectos de los fármacos , Homeostasis/fisiología , Proteínas Inhibidoras de la Apoptosis/genética , Locomoción/efectos de los fármacos , Masculino , Oxidación-Reducción/efectos de los fármacos , Estrés Oxidativo/efectos de los fármacos , Especies Reactivas de Oxígeno/metabolismo , Tauopatías/tratamiento farmacológico , Tauopatías/genética , Ácido Tióctico/farmacologíaRESUMEN
Background: There are different methods to develop in vitro neo-chondral tissues from adipose-derived stem cells (ADSCs). Application of electromagnetic field (EMF) on ADSCs is one of popular approaches, which results in chondrogenesis. If chondrogenic impact of EMF on ADSCs is supposed to be generalized as a protocol in translational medicine field, possible emergence of early or late hypertrophic maturation, mineralization and inflammatory side effects in chondrogenically differentiating ADSCs should be considered.Methods: The advent of chondrogenic and hypertrophic markers by differentiated cells under standard, platelet-rich plasma (PRP)-based or EMF treatments were monitored. Along with monitoring the expressions of chondrogenic markers, inflammatory and hypertrophic markers, VEGF/TNFα secretion, calcium deposition and ALP activity were evaluated.Results: Accordingly, treatment with %5 PRP results in higher GAG production, enhanced SOX9 transcription, lowered TNFα and VEGF secretions compared to other treatments. Although PRP up-regulates miR-146a and miR-199a in early and late stages of chondrogenesis, respectively, application of EMF + PRP down regulates miR-101 and -145 while up-regulates miR-140 and SOX9 expression.Conclusion: Comparing our results with previous reports suggests that presented EMF-ELF in this study with f = 50 Hz, EMF intensity of less than 30 mT, and 5% PRP (v/v), would facilitate chondrogenesis via mesenchymal stem cells with minor inflammation and hypertrophic maturation.Abbreviations: MSCs: mesenchymal stem cells; TGFß: transforming growth factor-beta; PRP: platelet-rich plasma; ELF-EMF: extremely low-frequency electromagnetic fields; GAGs: glycosaminoglycans; ADSCs: adipose-derived stem cells; VEGF: vascular endothelial growth factor; TNFα: tumor necrosis factor alpha; ALP: alkaline phosphatase.
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Condrogénesis/efectos de los fármacos , Condrogénesis/efectos de la radiación , Campos Electromagnéticos , Células Madre Mesenquimatosas/citología , Tejido Adiposo/citología , Biomarcadores/metabolismo , Diferenciación Celular/efectos de los fármacos , Diferenciación Celular/efectos de la radiación , Humanos , Hipertrofia/etiología , Células Madre Mesenquimatosas/efectos de los fármacos , Células Madre Mesenquimatosas/patología , Células Madre Mesenquimatosas/efectos de la radiación , MicroARNs/genética , Plasma Rico en Plaquetas/metabolismo , ARN Mensajero/genética , Factor de Crecimiento Transformador beta/farmacología , Factor A de Crecimiento Endotelial Vascular/metabolismoRESUMEN
Human diseases like viral organisms for example, hepatitis, HIV and etc., attack the health and caused large mortality in populations by many years. So finding novel delivery vehicles based antiviral drugs employing nano-materials is of high universal interest. In current approach a very biocompatible biodegradable nano-biopolymer anionic linear globular dendrimer second generation G2 was elaborately conjugated to a well-known anti-HIV drug Azidovudine and thereafter was characterized by different analytical techniques like AFM, Zeta sizer, 1HNMR, FTIR and LC-Mass spectroscopy. Then, Anionic Linear Globular DendrimerG2-Zidovudine Nano-Conjugate was assessed on human normal cells (toxicity assay by XTT test) and also HIV cell model and the results showed that Anionic Linear Globular DendrimerG2-Zidovudine Nano-Conjugate Significantly Decreased Retroviral Activity without any human cell toxicity respectively. Based on current experimental data such nano-compositions is proposed for further in vivo anti-HIV assays as well.
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Antirretrovirales/administración & dosificación , Supervivencia Celular/efectos de los fármacos , Dendrímeros/administración & dosificación , Sistemas de Liberación de Medicamentos/métodos , Nanoconjugados/administración & dosificación , Zidovudina/administración & dosificación , Aniones , Antirretrovirales/química , Supervivencia Celular/fisiología , Dendrímeros/química , Relación Dosis-Respuesta a Droga , Células HEK293 , VIH-1/efectos de los fármacos , VIH-1/fisiología , Humanos , Nanoconjugados/química , Polietilenglicoles/administración & dosificación , Polietilenglicoles/química , Estearatos/administración & dosificación , Estearatos/química , Zidovudina/químicaRESUMEN
BACKGROUND: Acinetobacter baumannii has emerged as a major cause of nosocomial infections. Various resistance mechanisms of A. baumannii against antibiotics have transformed it into a successful nosocomial pathogen. Because of the limited number of available antibiotics, we used a medicinal plant with an antibacterial effect. Zataria multiflora Boiss (ZMB) extract and its components were used for the treatment of pneumonic mice infected with A. baumannii. The biological effects of this extract and the regulation of the outer membrane protein A (ompA) gene were used in a mouse model. METHODS: A pneumonic mouse model was prepared using clinical and standard strains (1.5 × 108 colony-forming units/mL) of A. baumannii. BALB/c mice groups were treated with a ZMB extract, carvacrol, thymol, and sensitive antibiotics. The lung tissues of the treated mice were cultured for 5 days and each day, bacterial clearance and the ompA gene expression were assessed by quantitative real-time polymerase chain reaction. RESULTS: In the lung tissue culture of pneumonic mice infected with standard or clinical isolate, no colony was detected when treated with the ZMB extract after 2 and 3 days (P < 0.01), respectively. In the carvacrol-treated group, bacterial clearance was seen at day 4 and day 5 (P < 0.05). Bacterial clearance was seen 5 days after treatment with thymol and imipenem and 6 days after ampicillin/sulbactam treatment. The regulation of ompA gene was significantly decreased in this order: ZMB extract, carvacrol, thymol, imipenem, and ampicillin/sulbactam. DISCUSSION: The ZMB extract had a potent bactericidal effect against A. baumannii that could downregulate the ompA gene. ZBM extract and carvacrol could be novel therapeutic agents for antibiotic-resistant A. baumannii.
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Infecciones por Acinetobacter/tratamiento farmacológico , Acinetobacter baumannii/efectos de los fármacos , Antibacterianos/farmacología , Colistina/farmacología , Farmacorresistencia Bacteriana/efectos de los fármacos , Enfermedades Pulmonares/tratamiento farmacológico , Extractos Vegetales/farmacología , Infecciones por Acinetobacter/microbiología , Acinetobacter baumannii/genética , Acinetobacter baumannii/fisiología , Animales , Proteínas de la Membrana Bacteriana Externa/genética , Proteínas de la Membrana Bacteriana Externa/metabolismo , Cimenos/farmacología , Regulación Bacteriana de la Expresión Génica , Humanos , Imipenem/farmacología , Lamiaceae/química , Pulmón/efectos de los fármacos , Pulmón/microbiología , Pulmón/patología , Enfermedades Pulmonares/microbiología , Ratones Endogámicos BALB C , Pruebas de Sensibilidad Microbiana , Timol/farmacologíaRESUMEN
BACKGROUND: Infertile men have higher levels of semen reactive oxygen species (ROS) than fertile men. High levels of semen ROS can cause sperm dysfunction, sperm DNA damage and reduced male reproductive potential. This study investigated the effects of supplementation with N-acetyl-cysteine (NAC) on the sperm quality, chromatin integrity and levels of oxidative stress in infertile men. METHODS: The study was carried out in the unit of ACECR Infertility Research Center, Qom, Iran. The patients consisted of 50 infertile men with asthenoteratozoospermia who received NAC (600 mg/d) orally for 3 months, after which they were compared with pre-treatment status. Semen was analyzed according to WHO (2010), followed by the assessment of protamine content [chromomycin A3 (CMA3)] and DNA integrity [terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL)]. Oxidative stress markers, i.e. total antioxidant capacity (TAC) and malondialdehyde (MDA), as well as hormonal profile (LH, FSH, Testosterone and Prolactin) were determined by ELISA kit. RESULTS: After NAC treatment, patients' sperm count and motility increased significantly whereas abnormal morphology, DNA fragmentation and protamine deficiency showed significant decreases compared to pre-treatment levels (P < 0.05). Hormonal profile improvement was associated with lowered FSH and LH levels and increased amount of testosterone (P < 0.05). TAC significantly increased and MDA decreased with an inverse significant correlation between TAC and MDA (P < 0.05). CONCLUSION: NAC oral supplementation may improve sperm parameters and oxidative/antioxidant status in infertile males.
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Acetilcisteína/administración & dosificación , Cromatina/efectos de los fármacos , Suplementos Dietéticos , Infertilidad Masculina/tratamiento farmacológico , Estrés Oxidativo/efectos de los fármacos , Espermatozoides/efectos de los fármacos , Adulto , Cromatina/genética , Cromatina/metabolismo , Daño del ADN , Depuradores de Radicales Libres/administración & dosificación , Humanos , Infertilidad Masculina/genética , Infertilidad Masculina/fisiopatología , Irán , Masculino , Especies Reactivas de Oxígeno/antagonistas & inhibidores , Especies Reactivas de Oxígeno/metabolismo , Análisis de Semen , Motilidad Espermática/efectos de los fármacos , Espermatozoides/metabolismo , Espermatozoides/fisiologíaRESUMEN
Spermatogenic cells are susceptible to oxidative stress and apoptosis. Food deprivation (FD) has been reported as a stressor that could increase reactive oxygen species. In the present study, FD-induced oxidative stress and apoptosis, as well as the protective effects of melatonin, were evaluated in the testes. Wistar rats in the control group were fed a standard diet, whereas a sham group was administered saline as the melatonin vehicle. A third group received daily injections of melatonin (5mgkg-1 bodyweight). These rats were further divided into four groups of rats that were either subjected to FD, FD + isolation, FD + melatonin injection and FD + melatonin injection + isolation. Testicular tissues were evaluated for malondialdehyde (MDA) and reduced glutathione (GSH) concentrations, as well as and DNA damage. FD increased MDA and reduced GSH concentrations, whereas melatonin treatment improved these parameters. Immunohistochemistry for capsase-3 and terminal deoxyribonucleotidyl transferase-mediated dUTP-digoxigenin nick end-labelling revealed that the number of apoptotic cells was increased in rats subjected to FD alone. Melatonin treatment offset the number of apoptotic cells following FD. The results provide evidence that FD can increase oxidative stress, leading to activation of apoptosis, and that melatonin has the ability to protect the testes against oxidative damage induced by FD.
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Magnesium oxide nanoparticles (MgONPs) are used in medicine, manufacturing and food industries. Because of their extensive application in our daily lives, environmental exposure to these nanoparticles is inevitable. The present study examined the effects of MgONPs on zebrafish (Danio rerio) early developmental stages. The results showed that, at different concentrations, MgONPs induced cellular apoptosis and intracellular reactive oxygen species. The hatching rate and survival of embryos decreased in a dose dependent manner. The 96-h LC50 value of MgONPs on zebrafish survival was 428 mg/l and the 48-h EC50 value of MgONPs on zebrafish embryo hatching rate was 175 mg/l. Moreover different types of malformation were observed in exposed embryos. The results demonstrate the toxic effects of MgONPs on zebrafish embryos and emphasize the need for further studies.
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Embrión no Mamífero/efectos de los fármacos , Desarrollo Embrionario/efectos de los fármacos , Óxido de Magnesio/toxicidad , Nanopartículas/toxicidad , Pez Cebra/crecimiento & desarrollo , Animales , Apoptosis/efectos de los fármacos , Embrión no Mamífero/anomalías , Embrión no Mamífero/metabolismo , Embrión no Mamífero/patología , Larva/efectos de los fármacos , Larva/metabolismo , Especies Reactivas de Oxígeno/metabolismo , Contaminantes Químicos del Agua/toxicidadRESUMEN
Repair or replacement of damaged tissues using tissue engineering technology is considered to be a fine solution for enhanced treatment of different diseases such as skin diseases. Although the nanofibers made of synthetic degradable polymers, such as polylactic acid (PLA), have been widely used in the medical field, they do not favour cellular adhesion and proliferation. To enhance cell adherence on scaffold and improve biocompatibility, the surface of PLA scaffold was modified by gelatin in our experiments. For electrospinning, PLA and gelatin were dissolved in hexafluoroisopropanol (HFIP) solvent at varying compositions (PLA:gelatin at 3:7 and 7:3). The properties of the blending nanofiber scaffold were investigated by Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM). Modified PLA/gelatin 7/3 scaffold is more suitable for fibroblasts attachment and viability than the PLA or gelatin nanofiber alone. Thus fibroblast cultured on PLA/gelatin scaffold could be an alternative way to improve skin wound healing.
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Ácido Láctico/química , Polímeros/química , Ingeniería de Tejidos , Andamios del Tejido , Animales , Materiales Biocompatibles/química , Materiales Biocompatibles/metabolismo , Adhesión Celular , Supervivencia Celular , Células Cultivadas , Fibroblastos/citología , Gelatina/química , Gelatina/metabolismo , Humanos , Concentración de Iones de Hidrógeno , Ácido Láctico/metabolismo , Masculino , Nanofibras/química , Poliésteres , Polímeros/metabolismo , Propanoles/química , Ratas , Ratas Wistar , Piel/patología , Propiedades de SuperficieRESUMEN
PURPOSE: Antioxidant and anti-apoptotic effects of melatonin on development of in vitro fertilization (IVF)/vitrified two-cell mouse embryos were evaluated in this study. METHODS: The IVF two-cell embryos were vitrified by cryotop, and were cultured in KSOM medium in different concentrations of melatonin (10(-6), 10(-9), 10(-12) M) and without melatonin. The blastocyst cell number, apoptotic cells and glutathione (GSH) level were evaluated by differential, TUNEL and cell tracker blue staining, respectively. The expression of Bax and Bcl-xl genes was evaluated by qPCR. The expression of melatonin receptors (Mtnr1a and Mtnr1b) in mouse 2-cell embryos and blastocysts was evaluated by RT-PCR. RESULTS: Melatonin increased the rate of cleavage and blastulation at 10(-12) M concentration (p < 0.05). The number of trophectoderm and inner cell mass showed a significant increase (p < 0.05) in 10(-9) M melatonin. The 10(-9) M and 10(-12) M melatonin treatments significantly reduced (p < 0.05) the apoptotic index. The significant increase in the expression of Bcl-xl observed at 10(-9) M concentration however, reduced expression of Bax was not statistically significant. The levels of GSH in 10(-9) and 10(-12) M groups were significantly improved relative to the control group (p < 0.05). The Mtnr1a was expressed in 2-cell embryos and blastocysts in all groups, but the expression of Mntr1b was not detected. CONCLUSION: Melatonin may have a special role against oxidative stress in protection of IVF/vitrified embryos.
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Regulación del Desarrollo de la Expresión Génica/efectos de los fármacos , Proteína bcl-X/metabolismo , Animales , Técnicas de Cultivo de Embriones , Desarrollo Embrionario/efectos de los fármacos , Femenino , Fertilización In Vitro , Melatonina/farmacología , Ratones , Estrés Oxidativo , Vitrificación , Proteína bcl-X/genéticaRESUMEN
Background & Objective: Superantigens are bacterial toxins that induce a massive immune response in the host. Superantigen staphylococcal enterotoxin B (SEB) can form a ternary complex with its receptors, MHC class II (MHCII) and TCR, and can be used in tumor-targeting therapy, particularly when cooperating with a specific vector. In this study, SEB was fused to interleukin-13 (IL13), which forms a complex with IL13 receptor α2 (IL13Rα2) overexpressed in glioblastoma multiforme (GBM) cells for therapeutic goals. Methods: We designed four fusion proteins based on the arrangement of SEB (N- or C-terminal domain) and provided a flexible inter-domain linker (no or yes), resulting in the formation of SEB-IL13, SEB-L-IL13, IL13-SEB, and IL13-L-SEB, respectively. These fusion proteins were then evaluated for their various physicochemical properties and structural characteristics. Bioinformatics tools were employed to predict, refine, and validate the three-dimensional structure of the fusion proteins. In addition, the fusion proteins were docked with IL13Rα2, MHCII, and TCR receptors through the HADDOCK 2.4 server. The candidate fusion protein was subjected to molecular dynamics simulation. Results: There were differences among the designed fusion proteins. The model with the N-terminal domain of IL13 and containing an inter-domain linker (IL13-L-SEB) was stable and had a long half-life. The docking analysis revealed that the IL13-L-SEB fusion protein had a higher binding affinity to the IL13Rα2, MHCII, and TCR receptors. Finally, using molecular dynamics simulation through iMODS, acceptable results were obtained for the IL13-L-SEB docked complexes. Conclusion: The results suggest IL13-L-SEB is a promising novel fusion protein for cancer therapeutic application.
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Collagen, a naturally occurring fibrous protein, is a potential resource of biological materials for tissue engineering and regenerative medicine because it is structurally biocompatible, has low immunogenicity, is biodegradable, and is biomimetic. Numerous studies have documented in the literature how Collagen nanofibers exhibit limited cell adhesion, poor viscosity, and no interior fibril structure. The biomedical industry is using Poly Glycerol Sebacate prepolymer(PGSp), a biodegradable and biocompatible polyester with high adhesion and very viscous appearance, more often. Here, unique electrospun Collagen/PGSp/ZnO/NPs blend nanofibers for skin tissue application were developed and described with varied PGSp percent. Additionally, when ternary blends of Collagen, PGSp, and Zink Oxide Nanoparticles (ZnO NPs) are used, the antibacterial properties of the scaffolds are improved. The bead-free electrospun nanofibers were produced by raising the PGSp concentration to 30%w/w. SEM, EDS, tensile, MTT, FTIR, SDS-page, swelling test, contact-angle, antimicrobial, biodegradation, XRD, and cell attachment procedures were used to characterize the crosslinked nanofibers. The ternary blend nanofibers with a weight ratio of Collagen/PGSp 30%/ZnONPs 1% had higher stress/strain strength (0.25 mm/mm), porosity (563), cell survival, and degradation time. Moreover, after applying for wound healing in diabetic rats, Collagen/PGSp 30%/could be show improving wound healing significantly compared to other groups.
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Purpose: Due to the multilayered structure of the skin tissue, the architecture of its engineered scaffolds needs to be improved. In the present study, 45s5 bioglass nanoparticles were selected to induce fibroblast proliferation and their protein secretion, although cobalt ions were added to increase their potency. Methods: A 3-layer scaffold was designed as polyurethane (PU) - polycaprolactone (PCL)/ collagen/nanoparticles-PCL/collagen. The scaffolds examined by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), tensile, surface hydrophilicity and weight loss. Biological tests were performed to assess cell survival, adhesion and the pattern of gene expression. Results: The mechanical assay showed the highest young modulus for the scaffold with the doped nanoparticles and the water contact angle of this scaffold after chemical crosslinking of collagen was reduced to 52.34±7.7°. In both assessments, the values were statistically compared to other groups. The weight loss of the corresponding scaffold was the highest value of 82.35±4.3 % due to the alkaline effect of metal ions and indicated significant relations in contrast to the scaffold with non-doped particles and bare one (P value<0.05). Moreover, better cell expansion, greater cell confluence and a lower degree of toxicity were confirmed. The up-regulation of TGF ß1 and VEGF genes introduced this scaffold as a better model for the fibroblasts commitment to a new skin tissue among bare and nondoped scaffold (P value<0.05). Conclusion: The 3-layered scaffold which is loaded with cobalt ions-bonded bioglass nanoparticles, is a better substrate for the culture of the fibroblasts.
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Osteochondral tissue engineering using layered scaffolds is a promising approach for treating osteochondral defects as an alternative to microfracture procedure, autologous chondrocyte implantation, and cartilage-bone grafting. The team previously investigated the chondrogenesis of mesenchymal stem cells (MSCs) on a polycaprolactone (PCL)/acetylated hyaluronic acid scaffold. The present study first focused on fabricating a novel osteoconductive scaffold utilizing bismuth-nanohydroxyapatite/reduced graphene oxide (Bi-nHAp/rGO) nanocomposite and electrospun PCL. The osteoconductive ability of the scaffold was investigated by evaluating the alkaline phosphatase (ALP) activity and the osteogenic genes expression in the adipose-derived MSCs. The expression of Runx2, collagen I, ALP, and osteocalcin as well as the result of ALP activity indicated the osteoconductive potential of the Bi-nHA-rGO/PCL scaffold. In the next step, a bilayer scaffold containing Bi-nHAp/rGO/PCL as an osteogenic layer and acetylated hyaluronic acid/PCL as a chondrogenic layer was prepared by the electrospinning technique and transplanted into osteochondral defects of rats. The chondrogenic and osteogenic markers corresponding to the surrounding tissues of the transplanted scaffold were surveyed 60 days later by real-time polymerase chain reaction (PCR) and immunohistochemistry methods. The results showed increased chondrogenic (Sox9 and collagen II) and osteogenic (osteocalcin and ALP) gene expression and augmented secretion of collagens II and X after transplantation. The results strongly support the efficacy of this constructed cell-free bilayer scaffold to induce osteochondral defect regeneration.
RESUMEN
Nuclear pore complex (NPC) is the only corridor for macromolecules exchange between nucleus and cytoplasm. NPC and its components, nucleoporins, play important role in the diverse physiological processes including macromolecule exchange, chromosome segregation, apoptosis and gene expression. Recent reports also suggest involvement of nucleoporins in carcinogenesis. Applying proteomics, we analyzed expression pattern of the NPC components in a newly established esophageal cancer cell line from Persia (Iran), the high-risk region for esophageal cancer. Our results indicate overexpression of Hsc70 and downregulation of subunit alpha type-3 of proteasome, calpain small subunit 1, and eIF5A-1. Among these proteins, Hsc70 and eIF5A-1 are in direct interaction with NPC and involved in the nucleocytoplasmic exchange. Hsc70 plays a critical role as a chaperone in the formation of a cargo-receptor complex in nucleocytoplasmic transport. On the other hand, it is an NPC-associated protein that binds to nucleoporins and contributes in recycling of the nucleocytoplasmic transport receptors in mammals and affects transport of proteins between nucleus and cytoplasm. The other nuclear pore interacting protein: eIF5A-1 binds to the several nucleoporins and participates in nucleocytoplasmic transport. Altered expression of Hsc70 and eIF5A-1 may cause defects in nucleocytoplasmic transport and play a role in esophageal carcinogenesis.
Asunto(s)
Neoplasias Esofágicas/metabolismo , Proteínas del Choque Térmico HSC70/metabolismo , Poro Nuclear/metabolismo , Factores de Iniciación de Péptidos/metabolismo , Proteínas de Unión al ARN/metabolismo , Carcinoma de Células Escamosas/metabolismo , Línea Celular Tumoral , Electroforesis en Gel Bidimensional , Humanos , Unión Proteica , Proteómica , Espectrometría de Masa por Láser de Matriz Asistida de Ionización Desorción , Factor 5A Eucariótico de Iniciación de TraducciónRESUMEN
Feeder layers have been applied extensively to support the growth and stemness potential of stem cells for in vitro cultures. Mouse embryonic fibroblast and mouse fibroblast cell line (SNL) are common feeder cells for human induced pluripotent stem cells (hiPSCs) culture. Because of some problems in the use of these animal feeders and in order to simplify the therapeutic application of hiPSCs, we tested human adult bone marrow mesenchymal stem cells (hMSCs) as a potent feeder system. This method benefits from prevention of possible contamination of animal origin feeder systems. hiPSCs transferred onto mitotically inactivated hMSCs and passaged every 5 days. Prior to this culture, MSCs were characterized by flow cytometry of their surface markers and evaluation of their osteogenic and adipogenic differentiation potentials. The morphology, expressions of some specific pluripotency markers such as SSEA-3, NANOG and TRA-1-60, alkaline phosphates activity, formation embryoid bodies and their differentiation potentials of iPSCs on SNL and MSC feeder layers were evaluated. To investigate the prolonged maintenance of pluripotency, the quantitative transcriptions of some pluripotency markers including OCT4, SOX2, NANOG and REX1 were compared in the iPS clones on SNL or MSC feeders. Human iPSCs cultured on human MSCs feeder were slightly thinner and flatter than ones on the other feeder system. Interestingly MSCs supported the prolonged in vitro proliferation of hiPSCs along with maintenance of their pluripotency. Altogether our results suggest human mesenchymal stem cells as an appropriate feeder layer for human iPSCs culture for clinical applications and cell therapy.
Asunto(s)
Técnicas de Cultivo de Célula/métodos , Células Nutrientes/citología , Células Madre Pluripotentes Inducidas/citología , Células Madre Mesenquimatosas/citología , Animales , Diferenciación Celular , Proliferación Celular , Fibroblastos , Citometría de Flujo , Humanos , RatonesRESUMEN
Human induced pluripotent stem cells (iPSCs) have been shown to have promising potential for regenerative medicine and tissue engineering applications. In the present study, osteogenic differentiation of human iPSCs was evaluated on polyethersulfone (PES) nanofibrous scaffold. According to the results, higher significant expressions of common osteogenic-related genes such as runx2, collagen type I, osteocalcin and osteonectin was observed in PES seeded human iPSCs compared with control. Alizarin red staining and alkaline phosphatase activity of differentiated iPSCs demonstrated significant osteoblastic differentiation potential of these cells. In this study biocompatibility of PES nanofibrous scaffold confirmed by flattened and spreading morphology of iPSCs under osteoblastic differentiation inductive culture. Taking together, nanofiber-based PES scaffold seeded iPSCs showed the highest capacity for differentiation into osteoblasts-like cells. These cells and PES scaffold were demonstrated to have great efficiency for treatment of bone damages and lesions.
Asunto(s)
Diferenciación Celular , Células Madre Pluripotentes Inducidas/citología , Nanofibras , Osteoblastos/citología , Polímeros , Sulfonas , Andamios del Tejido , Fosfatasa Alcalina/metabolismo , Técnicas de Cultivo de Célula , Cuerpos Embrioides , Activación Enzimática , Expresión Génica , Humanos , Células Madre Pluripotentes Inducidas/metabolismo , Nanofibras/ultraestructura , Osteoblastos/metabolismoRESUMEN
Various factors are effective in reducing the fertility rate. This experiment aimed to investigate chlorpyrifos (CPF), an organophosphate, that could alter the structure of the uterus and the molecules involved in parental and fetal. CPF was injected intraperitoneally in thirty mice for five days in a week (six weeks). The animals were euthanized on the 5th day of gestation, then their blood and uterus were collected for biochemical and histopathological assays. Exposure to CPF resulted in a significant reduction in maternal weight gain and the number of litters. Alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (ALP) were significantly increased in blood serum of the CPF group compared with the control. The number of uterus glands, endometrium thickness, and the uterine cavity were changed following CPF injection. Additional investigation indicated that the expressions of L-selectin, L-selectin ligand, and heparin-binding epidermal growth factor (HB-EGF) as initial adhesion of mice blastocysts and maternal endometrium biomarkers were downregulated in the CPF group. Nevertheless, any mortality and abnormal clinical symptoms were not observed in the treated mice. This study revealed a potential molecular mechanism of continuous CPF-induced toxicity in fetal-maternal attachment without clinical symptoms.