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1.
Mol Ther ; 30(9): 2891-2908, 2022 09 07.
Artigo em Inglês | MEDLINE | ID: mdl-35918892

RESUMO

It is well established that macrophages are key regulators of wound healing, displaying impressive plasticity and an evolving phenotype, from an aggressive pro-inflammatory or "M1" phenotype to a pro-healing or "M2" phenotype, depending on the wound healing stage, to ensure proper healing. Because dysregulated macrophage responses have been linked to impaired healing of diabetic wounds, macrophages are being considered as a therapeutic target for improved wound healing. In this review, we first discuss the role of macrophages in a normal skin wound healing process and discuss the aberrations that occur in macrophages under diabetic conditions. Next we provide an overview of recent macrophage-based therapeutic approaches, including delivery of ex-vivo-activated macrophages and delivery of pharmacological strategies aimed at eliminating or re-educating local skin macrophages. In particular, we focus on strategies to silence key regulator genes to repolarize wound macrophages to the M2 phenotype, and we provide a discussion of their potential future clinical translation.


Assuntos
Diabetes Mellitus Experimental , Animais , Macrófagos , Fenótipo , Pele/lesões , Cicatrização/fisiologia
2.
Anal Bioanal Chem ; 413(6): 1615-1627, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33501550

RESUMO

Serotonin (5-HT) levels have been associated with several exclusively metabolic disorders. Herein, a new approach for 5-HT level as a novel biomarker of diabetes mellitus is considered using a simple nanocomposite and HPLC method. Reduced graphene oxide (rGO) comprising gold nanoparticles (AuNPs) was decorated with 18-crown-6 (18.Cr.6) to fabricate a simple nanocomposite (rGO-AuNPs-18.Cr.6). The nanocomposite was positioned on a glassy carbon electrode (GCE) to form an electrochemical sensor for the biomarker 5-HT in the presence of L-tryptophan (L-Trp), dopamine (DA), ascorbic acid (AA), urea, and glucose. The nanocomposite exhibited efficient catalytic activity for 5-HT detection by square-wave voltammetry (SWV). The proposed sensor displayed high selectivity, excellent reproducibility, notable anti-interference ability, and long-term stability even after 2 months. SWV defined a linear range of 5-HT concentration from 0.4 to 10 µg L-1. A diabetic animal model (diabetic zebrafish model) was then applied to investigate 5-HT as a novel biomarker of diabetes. A limit of detection (LOD) of about 0.33 µg L-1 was found for the diabetic group and 0.15 µg L-1 for the control group. The average levels of 5-HT obtained were 9 and 2 µg L-1 for control and diabetic groups, respectively. The recovery, relative standard deviation (RSD), and relative error (RE) were found to be about 97%, less than 2%, and around 3%, respectively. The significant reduction in 5-HT level in the diabetic group compared to the control group proved that the biomarker 5-HT can be applied for the early diagnosis of diabetes mellitus.


Assuntos
Diabetes Mellitus/diagnóstico , Técnicas Eletroquímicas/métodos , Serotonina/análise , Animais , Ácido Ascórbico/análise , Biomarcadores/metabolismo , Dopamina/análise , Eletrodos , Glucose/análise , Ouro/química , Ligação de Hidrogênio , Limite de Detecção , Nanopartículas Metálicas/química , Microscopia Eletrônica de Varredura , Microscopia Eletrônica de Transmissão , Nanocompostos/química , Tamanho da Partícula , Reprodutibilidade dos Testes , Triptofano/análise , Ureia/análise , Peixe-Zebra
3.
Int J Mol Sci ; 22(2)2021 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-33467656

RESUMO

Delivery of small interfering RNA (siRNA) provides one of the most powerful strategies for downregulation of therapeutic targets. Despite the widely explored capabilities of this strategy, intracellular delivery is hindered by a lack of carriers that have high stability, low toxicity and high transfection efficiency. Here we propose a layer by layer (LBL) self-assembly method to fabricate chitosan-coated gold nanoparticles (CS-AuNPs) as a more stable and efficient siRNA delivery system. Direct reduction of HAuCl4 in the presence of chitosan led to the formation of positively charged CS-AuNPs, which were subsequently modified with a layer of siRNA cargo molecules and a final chitosan layer to protect the siRNA and to have a net positive charge for good interaction with cells. Cytotoxicity, uptake, and downregulation of enhanced Green Fluorescent Protein (eGFP) in H1299-eGFP lung epithelial cells indicated that LBL-CS-AuNPs provided excellent protection of siRNA against enzymatic degradation, ensured good uptake in cells by endocytosis, facilitated endosomal escape of siRNA, and improved the overall silencing effect in comparison with commercial transfection reagents Lipofectamine and jetPEI®. Therefore, this work shows that LBL assembled CS-AuNPs are promising nanocarriers for enhanced intracellular siRNA delivery and silencing.


Assuntos
Quitosana/química , Sistemas de Liberação de Medicamentos , Ouro/química , Nanopartículas Metálicas/química , RNA Interferente Pequeno/metabolismo , Biopolímeros/química , Linhagem Celular Tumoral , Sobrevivência Celular , Endocitose , Endossomos/metabolismo , Inativação Gênica , Técnicas de Transferência de Genes , Proteínas de Fluorescência Verde/química , Humanos , Lipídeos/química , Microscopia Confocal , RNA/metabolismo
4.
Int J Mol Sci ; 22(17)2021 Aug 26.
Artigo em Inglês | MEDLINE | ID: mdl-34502144

RESUMO

Impaired wound healing in people with diabetes has multifactorial causes, with insufficient neovascularization being one of the most important. Hypoxia-inducible factor-1 (HIF-1) plays a central role in the hypoxia-induced response by activating angiogenesis factors. As its activity is under precise regulatory control of prolyl-hydroxylase domain 2 (PHD-2), downregulation of PHD-2 by small interfering RNA (siRNA) could stabilize HIF-1α and, therefore, upregulate the expression of pro-angiogenic factors as well. Intracellular delivery of siRNA can be achieved with nanocarriers that must fulfill several requirements, including high stability, low toxicity, and high transfection efficiency. Here, we designed and compared the performance of layer-by-layer self-assembled siRNA-loaded gold nanoparticles with two different outer layers-Chitosan (AuNP@CS) and Poly L-arginine (AuNP@PLA). Although both formulations have exactly the same core, we find that a PLA outer layer improves the endosomal escape of siRNA, and therefore, transfection efficiency, after endocytic uptake in NIH-3T3 cells. Furthermore, we found that endosomal escape of AuNP@PLA could be improved further when cells were additionally treated with desloratadine, thus outperforming commercial reagents such as Lipofectamine® and jetPRIME®. AuNP@PLA in combination with desloratadine was proven to induce PHD-2 silencing in fibroblasts, allowing upregulation of pro-angiogenic pathways. This finding in an in vitro context constitutes a first step towards improving diabetic wound healing with siRNA therapy.


Assuntos
Indutores da Angiogênese/metabolismo , Angiopatias Diabéticas/metabolismo , Ouro , Hipóxia/metabolismo , Lisossomos , Nanopartículas , RNA Interferente Pequeno/genética , Animais , Sobrevivência Celular , Fenômenos Químicos , Angiopatias Diabéticas/etiologia , Angiopatias Diabéticas/patologia , Composição de Medicamentos , Endossomos/metabolismo , Técnicas de Transferência de Genes , Hipóxia/genética , Loratadina/análogos & derivados , Loratadina/química , Loratadina/farmacologia , Camundongos , Células NIH 3T3 , Nanopartículas/química , RNA Interferente Pequeno/administração & dosagem
5.
Cell Tissue Res ; 375(3): 709-721, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-30338376

RESUMO

Full-thickness skin defect is one of the main clinical problems, which cannot be repaired spontaneously. The aim of this study was to evaluate the feasibility of combining nanofibers with ADM as a bilayer scaffold for treatment of full-thickness skin wounds in a single-step procedure. The nanofibrous polycaprolactone/fibrinogen scaffolds were fabricated by electrospinning. Subsequently, mesenchymal stem cells were isolated from rat adipose tissues and characterized by flow cytometry. Cell adhesion, proliferation, and the epidermal differentiation potential of adipose-derived stem cells (ADSCs) on nanofibrous scaffolds were investigated by scanning electron microscopy (SEM), alamarBlue, and real-time PCR, respectively. In animal studies, full-thickness excisional wounds were created on the back of rats and treated with following groups: ADM, ADM-ADSCs, nanofiber, nanofiber-ADSCs, bilayer, and bilayer-ADSCs. In all groups, wounds were harvested on days 14 and 21 after treatment to evaluate re-epithelialization, blood vessel density, and collagen content. The results indicated that ADSCs seeded on ADM, nanofiber, and bilayer scaffolds can promote re-epithelialization, angiogenesis, and collagen remodeling in comparison with cell-free scaffolds. In conclusion, nanofiber-ADSCs showed the best results for re-epithelialization (according to histological scoring), average blood vessel density (92.7 ± 6.8), and collagen density (87.4 ± 4.9%) when compared to the control and other experimental groups.


Assuntos
Derme Acelular/metabolismo , Células-Tronco Mesenquimais/citologia , Nanofibras/química , Pele/patologia , Alicerces Teciduais/química , Cicatrização , Derme Acelular/efeitos dos fármacos , Tecido Adiposo/citologia , Animais , Diferenciação Celular/efeitos dos fármacos , Linhagem da Célula/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Forma Celular/efeitos dos fármacos , Colágeno/metabolismo , Epiderme/efeitos dos fármacos , Epiderme/metabolismo , Fibrinogênio/farmacologia , Células-Tronco Mesenquimais/efeitos dos fármacos , Neovascularização Fisiológica/efeitos dos fármacos , Poliésteres/farmacologia , Ratos Wistar , Engenharia Tecidual , Cicatrização/efeitos dos fármacos
6.
J Mater Sci Mater Med ; 31(1): 8, 2019 Dec 14.
Artigo em Inglês | MEDLINE | ID: mdl-31838602

RESUMO

Endometriosis is a common, chronic gynecological disorder associated with ongoing pelvic pain, infertility, and adhesions in reproductive age women. Current therapeutic strategies are not effective and the recurrent nature of endometriosis makes it difficult to treat. In this study, we have designed a drug delivery system to control sustained and prolonged release of curcumin in the peritoneum and pelvic cavity of a mouse model of endometriosis. Poly ε-Caprolactone (PCL) and poly ethylene glycol (PEG) polymers were used to synthesize curcumin loaded nanofibers. After scanning electron microscopy (SEM) observation of the nanofiber's morphology, we evaluated the drug release profile and in vitro degradation rate of the curcumin-loaded nanofibers. Next, we tested these nanofibers in vivo in the peritoneum of an endometriosis mouse model to determine their anti-endometriosis effects. Histological evaluations were also performed. Curcumin loaded nanofibers were successfully synthesized in the 8 and 10 wt% polymers. The release test of the curcumin-loaded nanofibers showed that approximately 23% of the loaded curcumin was released during 30 min, 35% at 24 h, and 50% at 30 days. Endometriosis was successfully induced in Balb/c mice, as noted by the observed characteristics of endometriosis in all of the mice and confirmation of endometriosis by hematoxylin and eosin (H&E) staining. In vivo experiments showed the ability of these implanted curcumin loaded nanofibers to mitigate endometriosis. We observed a considerable reduction in the endometrial glands and stroma, along with significant reduction in infiltration of inflammatory cells. Implantable curcumin loaded nanofibers successfully mitigated intraperitoneal endometriosis.


Assuntos
Anti-Inflamatórios/uso terapêutico , Curcumina/química , Curcumina/uso terapêutico , Endometriose/tratamento farmacológico , Nanofibras/química , Animais , Anti-Inflamatórios/administração & dosagem , Curcumina/administração & dosagem , Formas de Dosagem , Sistemas de Liberação de Medicamentos , Técnicas Eletroquímicas , Feminino , Camundongos , Camundongos Endogâmicos BALB C , Estrutura Molecular
7.
Mikrochim Acta ; 186(1): 49, 2019 01 04.
Artigo em Inglês | MEDLINE | ID: mdl-30610391

RESUMO

This review (with 131 references) summarizes the progress made in the past years in the field of nanomaterial based sensing of serotonin (5-HT). An introduction summarizes the significant role of 5-HT as a biomarker for several major diseases, methods for its determination and the various kinds of nanomaterials for use in electrochemical sensing process relies principally on a precise choice of electrodes. The next main section covers nanomaterial based methods for sensing 5-HT, with subsections on electrodes modified with carbon nanotubes, graphene related materials, gold nanomaterials, and by other nanomaterials. A concluding section discusses future perspectives and current challenges of 5-HT determination. Graphical abstract Conceptual design of electrochemical sensing process of the biomarker serotonin by using nanomaterials and the role of 5-HTas biomarker in the body from preclinical to clincal.


Assuntos
Técnicas Eletroquímicas/métodos , Nanoestruturas/química , Serotonina/análise , Animais , Biomarcadores/análise , Técnicas Eletroquímicas/tendências , Eletrodos/tendências , Humanos
8.
J Cell Physiol ; 233(12): 9223-9236, 2018 12.
Artigo em Inglês | MEDLINE | ID: mdl-30078227

RESUMO

Tumor-associated macrophages (TAMs) are an important component of the leukocytic infiltrate of the tumor microenvironment. There is persuasive preclinical and clinical evidence that TAMs induce cancer inanition and malignant progression of primary tumors toward a metastatic state through a highly conserved and fundamental process known as epithelial-mesenchymal transition (EMT). Tumor cells undergoing EMT are distinguished by increased motility and invasiveness, which enable them to spread to distant sites and form metastases. In addition, besides becoming resistant to apoptosis and antitumor drugs, they also contribute to immunosuppression and get a cancer stem-cell like phenotype. Here, we will focus on selected molecular pathways underlying EMT-in particular, the role of TAMs in the induction and maintenance of EMT-and further discuss how the targeting of TAMs through the application of nanotechnology tools allows the development of a whole new range of therapeutics.


Assuntos
Transição Epitelial-Mesenquimal/genética , Macrófagos/patologia , Neoplasias/genética , Microambiente Tumoral/genética , Apoptose/genética , Resistencia a Medicamentos Antineoplásicos/genética , Humanos , Linfócitos do Interstício Tumoral/metabolismo , Linfócitos do Interstício Tumoral/patologia , Macrófagos/metabolismo , Nanotecnologia/tendências , Invasividade Neoplásica/genética , Invasividade Neoplásica/patologia , Neoplasias/tratamento farmacológico , Neoplasias/patologia , Células-Tronco Neoplásicas/patologia , Transdução de Sinais/genética
9.
J Mater Sci Mater Med ; 29(11): 168, 2018 Nov 03.
Artigo em Inglês | MEDLINE | ID: mdl-30392048

RESUMO

Electro-conductive nanocomposites have several applications in biomedical field. Development of a biocompatible electro-conductive polymeric materials is therefore of prime importance. In this study, electro-conductive nanofibrous mats of PLGA/CNT were fabricated through different methods including blend electrospinning, simultaneous PLGA electrospinning and CNT electrospraying and ultrasound-induced adsorption of CNTs on the electrospun PLGA nanofibers. The morphology and diameter of fibers were characterized by SEM and TEM, showing the lowest average diameters of 477 ± 136 nm for PLGA/MWCNT blend nanocomposites. MWCNT-sprayed PLGA specimens showed significant lower water contact angle (83°), electrical resistance (3.0 × 104 Ω) and higher mechanical properties (UTS: 5.50 ± 0.46 MPa) compared to the untreated PLGA scaffolds. Also, results of PC12 cell study demonstrated highest viability percentage on the MWCNT-sprayed PLGA nanofibers. We propose that the conductive nanocomposites have capability to use as tool for the neural regeneration and biosensors.


Assuntos
Técnicas Eletroquímicas , Nanocompostos , Nanotubos de Carbono/química , Copolímero de Ácido Poliláctico e Ácido Poliglicólico/química , Animais , Microscopia Eletrônica de Varredura , Células PC12 , Ratos
10.
Pharm Dev Technol ; 21(7): 887-893, 2016 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-26365132

RESUMO

Eugenol is the main constituent of clove oil with anti-inflammatory properties. In this work, for the first time, O/W nanoemulsion of eugenol was designed for the evaluation of anti-inflammatory effects as a topical delivery system. Topical formulations containing 1%, 2% and 4% of eugenol as well as a nanoemulsion system containing 4% eugenol and 0.5% piroxicam were prepared. Further to physicochemical examinations, such as determination of particle size, polydispersity index, zeta potential and physical stability, anti-inflammatory activity was examined in carrageenan-induced paw edema in rats. The optimum formulation was found to contain 2% eugenol (oil phase), 14% Tween 20 (surfactant) and 14% isopropyl alcohol (co-surfactant) in water. Nanoemulsion with polydispersity index of 0.3 and median droplet diameter of 24.4 nm (d50) was obtained. Animal studies revealed that the nanoemulsions exhibited significantly improved anti-inflammatory activity after 1.5 h, compared with marketed piroxicam gel. Additionally, it was shown that increasing the concentration of eugenol did not show higher inhibition of inflammation. Also, the nanoemulsion having piroxicam showed less anti-inflammatory properties compared with the nanoemulsion without piroxicam.


Assuntos
Anti-Inflamatórios/administração & dosagem , Emulsões/administração & dosagem , Eugenol/administração & dosagem , Nanopartículas/administração & dosagem , Administração Tópica , Animais , Anti-Inflamatórios/química , Carragenina/farmacologia , Química Farmacêutica/métodos , Sistemas de Liberação de Medicamentos/métodos , Estabilidade de Medicamentos , Edema/induzido quimicamente , Edema/tratamento farmacológico , Emulsões/química , Eugenol/química , Inflamação/tratamento farmacológico , Masculino , Nanopartículas/química , Tamanho da Partícula , Piroxicam/administração & dosagem , Piroxicam/química , Polissorbatos/química , Ratos , Absorção Cutânea
11.
J Mater Chem B ; 12(14): 3356-3375, 2024 Apr 03.
Artigo em Inglês | MEDLINE | ID: mdl-38505950

RESUMO

Clinical advances in genetically modified immune cell therapies, such as chimeric antigen receptor T cell therapies, have raised hope for cancer treatment. The majority of these biotechnologies are based on viral methods for ex vivo genetic modification of the immune cells, while the non-viral methods are still in the developmental phase. Nanocarriers have been emerging as materials of choice for gene delivery to immune cells. This is due to their versatile physicochemical properties such as large surface area and size that can be optimized to overcome several practical barriers to successful gene delivery. The in vivo nanocarrier-based gene delivery can revolutionize cell-based cancer immunotherapies by replacing the current expensive autologous cell manufacturing with an off-the-shelf biomaterial-based platform. The aim of this research is to review current advances and strategies to overcome the challenges in nanoparticle-based gene delivery and their impact on the efficiency, safety, and specificity of the process. The main focus is on polymeric and lipid-based nanocarriers, and their recent preclinical applications for cancer immunotherapy.


Assuntos
Terapia Genética , Imunoterapia Adotiva , Imunoterapia Adotiva/métodos , Técnicas de Transferência de Genes , Imunoterapia/métodos , Engenharia Celular
12.
Bioimpacts ; 14(3): 28854, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38938755

RESUMO

Introduction: The endothelial cells derived from the human vein cord (HUVECs) are used as in-vitro models for studying cellular and molecular pathophysiology, drug and hormones transport mechanisms, or pathways. In these studies, the proliferation and quantity of cells are important features that should be monitored and assessed regularly. So rapid, easy, noninvasive, and inexpensive methods are favorable for this purpose. Methods: In this work, a novel method based on fast Fourier transform square-wave voltammetry (FFTSWV) combined with a 3D printed electrochemical cell including two inserted platinum electrodes was developed for non-invasive and probeless rapid in-vitro monitoring and quantification of human umbilical vein endothelial cells (HUVECs). The electrochemical cell configuration, along with inverted microscope images, provided the capability of easy use, online in-vitro monitoring, and quantification of the cells during proliferation. Results: HUVECs were cultured and proliferated at defined experimental conditions, and standard cell counts in the initial range of 12 500 to 175 000 were prepared and calibrated by using a hemocytometer (Neubauer chamber) counting for electrochemical measurements. The optimum condition, for FFTSWV at a frequency of 100 Hz and 5 mV amplitude, were found to be a safe electrochemical measurement in the cell culture medium. In each run, the impedance or admittance measurement was measured in a 5 seconds time window. The total measurements were fulfilled at 5, 24, and 48 hours after the seeding of the cells, respectively. The recorded microscopic images before every electrochemical assay showed the conformity of morphology and objective counts of cells in every plate well. The proposed electrochemical method showed dynamic linearity in the range of 12 500-265 000 HUVECs 48 hours after the seeding of cells. Conclusion: The proposed electrochemical method can be used as a simple, fast, and noninvasive technique for tracing and monitoring of HUVECs population in in-vitro studies. This method is highly cheap in comparison with other traditional tools. The introduced configuration has the versatility to develop electrodes for the study of various cells and the application of other electrochemical designations.

13.
Avicenna J Med Biotechnol ; 15(2): 100-107, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37034894

RESUMO

Background: Methicillin-resistant Staphylococcus aureus (MRSA) has become a worldwide concern as an epidemic bacterium and a cause of nosocomial and community-acquired infections. One of the major problems in the prevention and treatment of infections caused by MRSA strains is their multi-drug resistant trait, which causes the spread of infections and increases the mortality rate. Therefore, a rapid and accurate method is needed to identify MRSA strains, initiate appropriate antibiotic therapy, and control its infection. The aim of this study was to develop a twin lateral flow immunoassay system to detect methicillin-resistant Staphylococcus aureus (MRSA). Methods: First, BSA blocked AuNPs-anti-peptidoglycan antibody and AuNPs-anti-BSA antibody were used to detect Staphylococcus aureus (S. aureus). Then, AuNPs-anti-PBP2a antibody was used to specifically detect MRSA. Sensitivity, specificity and limit of detection of this twin immunoassay system were assessed using MRSA, methicillin susceptible S. aureus and clinical samples. Results were compared to those of cefoxitin disc diffusion (FOX30) and Polymerase Chain Reaction (PCR) as gold standards. Results: The Limit of Detection (LOD) of this twin system were 103 and 104 CFU/ml for the first and second strips, respectively. Sensitivity and specificity of this innovative assay in detecting MRSA were 92.30 and 97.36%, compared to FOX30 and PCR, respectively. Conclusion: High rates of sensitivity and specificity of this initiative system show its high potentials for rapid and accurate detection of MRSA.

14.
Proc Inst Mech Eng H ; 237(11): 1318-1329, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37921021

RESUMO

Oxidant environment and inflammation are the leading cause of chronic wounds such as diabetic ulcers. A dressing containing antioxidants would ensure accelerated wound healing. In this study, electrospun gold nanoparticle (GNP)-embedded nanofibers were developed. GNPs (about 7 nm) were synthesized using saffron extract as a reducing and capping agent (GNP-EXT). For comparison, nanoparticles of the same size were also synthesized using citrate (GNP-CIT). Nanoparticle colloids showed a zeta potential of -27 mV. FTIR confirmed the presence of the extract molecules on the nanoparticles. DPPH assay demonstrated the significant radical scavenging properties of the GNP-EXT. The effect of nanoparticles on the viability of NIH3T3 mouse fibroblast cells was evaluated with an MTT assay that showed no significant toxicity of nanoparticles even in the highest concentration of 250 ppm. Then poly (ɛ-caprolactone) (PCL)- Collagen nanofibers containing GNPs were electrospun. By using SEM, TEM, ATR-FTIR, and contact angle measurement, the nanofibers were characterized. Proper cell adhesion and spreading was observed on nanofibers by SEM and Alamar blue assay illustrated appropriate cyto-compatibility on the obtained nanofibers after 5 days of cell seeding. Wound healing assay also confirmed the cell supporting properties and biocompatibility. The results suggest that saffron-synthesized GNP-loaded nanofibers would be considered as potential wound dressings.


Assuntos
Crocus , Nanopartículas Metálicas , Nanofibras , Camundongos , Animais , Ouro/farmacologia , Antioxidantes/farmacologia , Nanofibras/química , Células NIH 3T3 , Colágeno/química , Bandagens , Antibacterianos/química , Poliésteres/química
15.
IEEE Trans Nanobioscience ; 22(3): 685-701, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35724284

RESUMO

Recent global outbreak of COVID-19 has raised serious awareness about our abilities to protect ourselves from hazardous pathogens and volatile organic compounds. Evidence suggests that personal protection equipment such as respiratory masks can radically decrease rates of transmission and infections due to contagious pathogens. To increase filtration efficiency without compromising breathability, application of nanofibers in production of respiratory masks have been proposed. The emergence of nanofibers in the industry has since introduced a next generation of respiratory masks that promises improved filtration efficiency and breathability via nanometric pores and thin fiber thickness. In addition, the surface of nanofibers can be functionalized and enhanced to capture specific particles. In addition to conventional techniques such as melt-blown, respiratory masks by nanofibers have provided an opportunity to prevent pathogen transmission. As the surge in global demand for respiratory masks increases, herein, we reviewed recent advancement of nanofibers as an alternative technique to be used in respiratory mask production.


Assuntos
COVID-19 , Nanofibras , Humanos , COVID-19/prevenção & controle , Máscaras , Filtração
16.
Int J Biol Macromol ; 239: 124099, 2023 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-36948335

RESUMO

Wound dressing is applied to promote the healing process, wound protection, and additionally regeneration of injured skin. In this study, a bilayer scaffold composed of a hydrogel and nanofibers was fabricated to improve the regeneration of injured skin. To this end, polycaprolactone/gelatin (PCL/Gel) nanofibers were electrospun directly on the prepared collagen/alginate (Col/Alg) hydrogel. The bilayer scaffold was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), mechanical properties, and swelling/degradation time. Cytotoxicity assays were evaluated using MTT assay. Then, the nanofiber and bilayer scaffolds were seeded with Adipose-derived stem cells (ADSCs). ADSCs were isolated from rat adipose tissue and analyzed using flow cytometry, in advance. Full-thickness wounds on the backs of rats were dressed with ADSCs-seeded bilayer scaffolds and nanofibers. Histopathological evaluations were performed after 14 and 21 days using H&E (hematoxylin and eosin) staining. The results indicated that re-epithelialization, angiogenesis, and collagen remodeling were enhanced in ADSCs-seeded bilayer scaffolds and nanofibers in comparison with the control group. In conclusion, the best re-epithelialization, collagen organization, neovascularization, and low presence of inflammation in the wound area were observed in the ADSCs-seeded bilayer scaffolds.


Assuntos
Células-Tronco Mesenquimais , Nanofibras , Ratos , Animais , Gelatina , Alicerces Teciduais , Hidrogéis , Alginatos , Colágeno , Bandagens
17.
AAPS PharmSciTech ; 13(4): 1386-95, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23054990

RESUMO

Nanoemulsions are increasingly being investigated for their fascinating capability of loading both hydrophobic and hydrophilic molecules while their stability is still an issue, being affected by various factors. In this study, to evaluate the dominant factors affecting the stability of nanoemulsions, artificial neural networks (ANNs) were implemented. Nanoemulsions of almond oil in water containing oleic acid-coated superparamagnetic iron oxide nanoparticles were prepared using a mixture of Tween 80 and Span 80 as surfactant system and ethanol as a co-surfactant. The ratio of transparency of the samples at 30 min and 7 days after preparation was taken as an indication of the stability of samples. Four independent variables, namely, concentration of nanoparticle, surfactant, oil, and alcohol were investigated to find their relations with the dependent variable (i.e., transparency ratio). Using ANNs modeling, it was concluded that the stability is affected by all variables, with all variables showing reverse effect on the stability beyond an optimum amount.


Assuntos
Emulsões/química , Compostos Férricos/química , Nanopartículas/química , Redes Neurais de Computação , Estabilidade de Medicamentos , Etanol/química , Hexoses/química , Interações Hidrofóbicas e Hidrofílicas , Ácido Oleico/química , Tamanho da Partícula , Óleos de Plantas/química , Polissorbatos/química , Tensoativos/química , Água/química
18.
Environ Sci Pollut Res Int ; 29(53): 80411-80421, 2022 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-35716305

RESUMO

As the world battles with the outbreak of the novel coronavirus, it also prepares for future global pandemics that threaten our health, economy, and survivor. During the outbreak, it became evident that use of personal protective equipment (PPE), specially face masks, can significantly slow the otherwise uncontrolled spread of the virus. Nevertheless, the outbreak and its new variants have caused shortage of PPE in many regions of the world. In addition, waste management of the enormous economical and environmental footprint of single use PPE has proven to be a challenge. Therefore, this study advances the theme of decontaminating used masks. More specifically, the effect of various decontamination techniques on the integrity and functionality of nanofiber-based N95 masks (i.e. capable of at least filtering 95% of 0.3 µm aerosols) were examined. These techniques include 70% ethanol, bleaching, boiling, steaming, ironing as well as placement in autoclave, oven, and exposure to microwave (MW) and ultraviolet (UV) light. Herein, filtration efficiency (by Particle Filtration Efficiency equipment), general morphology, and microstructure of nanofibers (by Field Emission Scanning Electron microscopy) prior and after every decontamination technique were observed. The results suggest that decontamination of masks with 70% ethanol can lead to significant unfavorable changes in the microstructure and filtration efficiency (down to 57.33%) of the masks. In other techniques such as bleaching, boiling, steaming, ironing and placement in the oven, filtration efficiency dropped to only about 80% and in addition, some morphological changes in the nanofiber microstructure were seen. Expectedly, there was no significant reduction in filtration efficiency nor microstructural changes in the case of placement in autoclave and exposure to the UV light. It was concluded that, the latter methods are preferable to decontaminate nanofiber-based N95 masks.


Assuntos
COVID-19 , Nanofibras , Humanos , Respiradores N95 , Descontaminação/métodos , Aerossóis e Gotículas Respiratórios , Vapor , Etanol
19.
Mol Ther Nucleic Acids ; 29: 871-899, 2022 Sep 13.
Artigo em Inglês | MEDLINE | ID: mdl-36159590

RESUMO

Skin injuries and chronic non-healing wounds are one of the major global burdens on the healthcare systems worldwide due to their difficult-to-treat nature, associated co-morbidities, and high health care costs. Angiogenesis has a pivotal role in the wound-healing process, which becomes impaired in many chronic non-healing wounds, leading to several healing disorders and complications. Therefore, induction or promotion of angiogenesis can be considered a promising approach for healing of chronic wounds. Gene therapy is one of the most promising upcoming strategies for the treatment of chronic wounds. It can be classified into three main approaches: gene augmentation, gene silencing, and gene editing. Despite the increasing number of encouraging results obtained using nucleic acids (NAs) as active pharmaceutical ingredients of gene therapy, efficient delivery of NAs to their site of action (cytoplasm or nucleus) remains a key challenge. Selection of the right therapeutic cargo and delivery methods is crucial for a favorable prognosis of the healing process. This article presents an overview of gene therapy and non-viral delivery methods for angiogenesis induction in chronic wounds.

20.
Carbohydr Polym ; 278: 118926, 2022 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-34973744

RESUMO

Skin tissue engineering is an advanced method to repair and regenerate skin injuries. Recent research is focused on the development of scaffolds that are safe, bioactive, and cytocompatible. In this work, a new hybrid nanofibrous scaffold composed of polycaprolactone/chitosan-polyethylene oxide (PCL/Cs-PEO) incorporated with Arnebia euchroma (A. euchroma) extract were synthesized by the two-nozzle electrospinning method. Then the synthesized scaffold was characterized for morphology, sustainability, chemical structure and properties. Moreover, to verify their potential in the burn wound healing process, biodegradation rate, contact angle, swelling properties, water vapor permeability, mechanical properties, antibacterial activity and drug release profile were measured. Furthermore, cytotoxicity and biocompatibility tests were performed on human dermal fibroblasts cell line via XTT and LDH assay. It is shown that the scaffold improved and increased proliferation during in-vitro studies. Thus, results confirm the efficacy and potential of the hybrid nanofibrous scaffold for skin tissue engineering.


Assuntos
Antibacterianos/química , Materiais Biocompatíveis/química , Quitosana/química , Poliésteres/química , Polietilenoglicóis/química , Engenharia Tecidual , Antibacterianos/farmacologia , Materiais Biocompatíveis/farmacologia , Boraginaceae/química , Linhagem Celular , Proliferação de Células/efeitos dos fármacos , Quitosana/farmacologia , Escherichia coli/efeitos dos fármacos , Fibroblastos/efeitos dos fármacos , Humanos , Testes de Sensibilidade Microbiana , Extratos Vegetais/química , Extratos Vegetais/farmacologia , Poliésteres/farmacologia , Polietilenoglicóis/farmacologia , Staphylococcus aureus/efeitos dos fármacos , Alicerces Teciduais/química
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