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1.
ACS Biomater Sci Eng ; 7(1): 31-54, 2021 01 11.
Artigo em Inglês | MEDLINE | ID: mdl-33371667

RESUMO

Although extensive research is being done to combat SARS-CoV-2, we are yet far away from a robust conclusion or strategy. With an increased amount of vaccine research, nanotechnology has found its way into vaccine technology. Researchers have explored the use of various nanostructures for delivering the vaccines for enhanced efficacy. Apart from acting as delivery platforms, multiple studies have shown the application of inorganic nanoparticles in suppressing the growth as well as transmission of the virus. The present review gives a detailed description of various inorganic nanomaterials which are being explored for combating SARS-CoV-2 along with their role in suppressing the transmission of the virus either through air or by contact with inanimate surfaces. The review further discusses the use of nanoparticles for development of an antiviral coating that may decrease adhesion of SARS-CoV-2. A separate section has been included describing the role of nanostructures in biosensing and diagnosis of SARS-CoV-2. The role of nanotechnology in providing an alternative therapeutic platform along with the role of radionuclides in SARS-CoV-2 has been described briefly. Based on ongoing research and commercialization of this nanoplatform for a viral disease, the nanomaterials show the potential in therapy, biosensing, and diagnosis of SARS-CoV-2.


Assuntos
Antivirais/uso terapêutico , /tratamento farmacológico , Nanopartículas Metálicas/uso terapêutico , /efeitos dos fármacos , Animais , /terapia , Desinfetantes/farmacologia , Humanos , Compostos Radiofarmacêuticos/uso terapêutico , Dispositivos de Proteção Respiratória , /imunologia
2.
AAPS PharmSciTech ; 21(8): 298, 2020 Nov 02.
Artigo em Inglês | MEDLINE | ID: mdl-33140225

RESUMO

Rheumatoid arthritis (RA) is an autoimmune disease that is currently incurable. Inhibition of inflammation can prevent the deterioration of RA. 2-[(Aminocarbonyl)amino]-5-(4-fluorophenyl)-3-thiophenecarboxamide (TPCA-1) suppresses inflammation via the inhibition of nuclear factor-κ (NF-κB) signaling pathway. Gold-based therapies have been used to treat inflammatory arthritis since the 1940s. Hyaluronic acid (HA) is a targeting ligand for CD44 receptors overexpressed on activated macrophages. Therefore, a combined therapy based on TPCA-1, gold, and HA was explored for the treatment of RA in this study. We used gold nanocages (AuNCs) to load TPCA-1 and modified the TPCA-1 (T) loaded AuNCs with HA and peptides (P) to construct an anti-inflammatory nanoparticle (HA-AuNCs/T/P). An adjuvant-induced arthritis (AIA) mice model was used to investigate the in vivo anti-inflammatory efficacy of HA-AuNCs/T/P. In vivo distribution results showed that HA-AuNCs/T/P had increased and prolonged accumulation at the inflamed paws of AIA mice. Treatment by the HA-AuNCs/T/P suppressed joint swelling and alleviated cartilage and bone damage. By loading to HA-AuNCs/T/P, the effective concentration of TPCA-1 was greatly reduced from 20 to 0.016 mg/kg mice. This study demonstrated that HA-AuNCs/T/P could effectively suppress inflammation and alleviate the symptoms of AIA mice, suggesting a great potential of HA-AuNCs/T/P for the treatment of RA.


Assuntos
Amidas/química , Artrite Reumatoide/tratamento farmacológico , Ouro/química , Nanopartículas Metálicas/uso terapêutico , Tiofenos/química , Animais , Artrite Experimental/tratamento farmacológico , Ácido Hialurônico/administração & dosagem , Masculino , Nanopartículas Metálicas/administração & dosagem , Nanopartículas Metálicas/química , Camundongos
3.
Int J Nanomedicine ; 15: 7553-7568, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33116487

RESUMO

Background: A diabetic ulcer is one of the major causes of illness among diabetic patients that involves severe and intractable complications associated with diabetic wounds. Hence, a suitable wound-healing agent is urgently needed at this juncture. Greener nanotechnology is a very promising and emerging technology currently employed for the development of alternative medicines. Plant-mediated synthesis of metal nanoparticles has been intensively investigated and regarded as an alternative strategy for overcoming various diseases and their secondary complications like microbial infections. Hence, we are interested in developing phyto-engineered gold nanoparticles as useful therapeutic agents for the treatment of infectious diseases and wounds effectively. Methods and Results: We have synthesized phyto-engineered gold nanoparticles from the aqueous extract of Acalypha indica and characterized using advanced bio-analytical techniques. The surface plasmon resonance feature and crystalline behavior of gold nanoparticles were revealed by ultraviolet-visible spectroscopy and X-ray diffraction, respectively. High-performance liquid chromatography analysis of the extract demonstrated the presence of different constituents, while major functional groups were interpreted by the Fourier-transform infrared spectroscopy as the various stretching vibrations appeared for important O-H (3443 cm-1), C=O (1644 cm-1) and C-O (1395 cm-1) groups. Scanning electron microscopy, high-resolution transmission electron microscopy results revealed a distribution of spherical and rod-like nanostructures with 20 nm of size. The gold nanoparticle-coated cotton fabric was evaluated for the antibacterial activity against Staphylococcus epidermidis and Escherichia coli bacterial strains which revealed remarkable inhibition at the zone of inhibition of 31 mm diameter against S. epidermidis. Further, antioxidant activity was tested for their free radical scavenging property, and the maximum antioxidant activity of the extract containing gold nanoparticles was found to be 80% at 100 µg/mL. The potent free radical scavenging property of the nanoparticles is observed at IC50 value 16.25 µg/mL. Moreover, in vivo wound-healing activity was carried out using BALB/c mice model with infected diabetic wounds and observed the stained microscopic images at different time intervals (day 2, day 7 and day 15). It was noted that in 15 days, the wound area is completely re-epithelialized due to the presence of different morphologies such as spherical, needle and triangle nanoparticles. The re-epithelialization layer is fully covered by nanoparticles on the wound area and also collagen filled in the scar tissue when compared with the control group. Conclusion: The pharmacological evaluation results of the study indicated an encouraging antibacterial and antioxidant activity of the greener synthesized gold nanoparticles tethered with aqueous extract of Acalypha indica. Moreover, we demonstrated enhanced in vivo wound-healing efficiency of the synthesized gold nanoparticles through the animal model. Thus, the outcome of this work revealed that the phyto-engineered gold nanoparticles could be useful for biomedical applications, especially in the development of promising antibacterial and wound-healing agents.


Assuntos
Antibacterianos/farmacologia , Antioxidantes/farmacologia , Nanopartículas Metálicas/química , Cicatrização/efeitos dos fármacos , Acalypha/química , Animais , Antibacterianos/química , Antioxidantes/química , Fibra de Algodão , Escherichia coli/efeitos dos fármacos , Ouro/química , Química Verde/métodos , Nanopartículas Metálicas/uso terapêutico , Camundongos Endogâmicos BALB C , Testes de Sensibilidade Microbiana , Extratos Vegetais/química , Espectroscopia de Infravermelho com Transformada de Fourier , Staphylococcus epidermidis/efeitos dos fármacos , Têxteis , Difração de Raios X
4.
Int J Nanomedicine ; 15: 6247-6262, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32903812

RESUMO

Prosthesis-associated infections and aseptic loosening are major causes of implant failure. There is an urgent need to improve the antibacterial ability and osseointegration of orthopedic implants. Zinc oxide nanoparticles (ZnO-NPs) are a common type of zinc-containing metal oxide nanoparticles that have been widely studied in many fields, such as food packaging, pollution treatment, and biomedicine. The ZnO-NPs have low toxicity and good biological functions, as well as antibacterial, anticancer, and osteogenic capabilities. Furthermore, ZnO-NPs can be easily obtained through various methods. Among them, green preparation methods can improve the bioactivity of ZnO-NPs and strengthen their potential application in the biological field. This review discusses the antibacterial abilities of ZnO-NPs, including mechanisms and influencing factors. The toxicity and shortcomings of anticancer applications are summarized. Furthermore, osteogenic mechanisms and synergy with other materials are introduced. Green preparation methods are also briefly reviewed.


Assuntos
Antibacterianos/farmacologia , Nanopartículas Metálicas/química , Osteogênese/efeitos dos fármacos , Óxido de Zinco/farmacologia , Animais , Antibacterianos/química , Antineoplásicos/efeitos adversos , Antineoplásicos/química , Antineoplásicos/farmacologia , Condrogênese/efeitos dos fármacos , Química Verde , Humanos , Nanopartículas Metálicas/efeitos adversos , Nanopartículas Metálicas/uso terapêutico , Osteogênese/fisiologia , Próteses e Implantes , Óxido de Zinco/efeitos adversos , Óxido de Zinco/toxicidade
5.
Int J Nanomedicine ; 15: 6019-6032, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32848399

RESUMO

Purpose: To evaluate the antitumor efficacy of Ag3Au1Trp1:2NPs in a SCID mouse cancer model, with respect to their effect on tumor growth, on tumor's metastatic potential and the underlying molecular mechanism. Subjects and Methods: Ag3Au1Trp1:2NPs were radiolabeled with Gallium-68 and the biodistribution was studied in Swiss mice without tumors and in SCID mice bearing tumors. SCID mice received intratumoral Ag3Au1Trp1:2NPs and tumor size was measured using calipers. Lung and liver tissues were extracted and studied microscopically for the detection of any metastatic sites. Changes in the Caspase-3 and TNF-related apoptosis-inducing ligand (TRAIL) were also investigated using real-time PCR and Western blot techniques, respectively. Results: In the 4T1 tumor-bearing SCID mice, Ag3Au1Trp1:2NPs showed quick passive accumulation at tumor sites at 30 mins post-injection. Mice that received the highest dose of NPs (5.6mg/mL) demonstrated a 1.9-fold lower tumor volume compared to that of the control group at 11 days post-injection, while mice that did not receive NPs showed metastatic sites in liver and lung. Extracted tumor tissue of treated mice revealed increased Casp-3 mRNA levels as well as elevated TRAIL protein levels. Conclusion: Based on our results, Ag3Au1Trp1:2NPs express anti-tumor and anti-metastatic effects in vivo. Ag3Au1Trp1:2NPs also reach tumor site via the enhancement and retention effect which results in the apoptotic death of cancerous cells selectively via the extrinsic TRAIL-dependent pathway.


Assuntos
Antineoplásicos/química , Antineoplásicos/farmacologia , Nanopartículas Metálicas/uso terapêutico , Neoplasias Experimentais/patologia , Animais , Antineoplásicos/farmacocinética , Apoptose/efeitos dos fármacos , Caspase 3/metabolismo , Linhagem Celular Tumoral , Movimento Celular , Feminino , Radioisótopos de Gálio/química , Ouro/química , Ouro/farmacologia , Neoplasias Hepáticas/prevenção & controle , Neoplasias Hepáticas/secundário , Neoplasias Pulmonares/prevenção & controle , Neoplasias Pulmonares/secundário , Nanopartículas Metálicas/química , Camundongos SCID , Neoplasias Experimentais/tratamento farmacológico , Prata/química , Prata/farmacologia , Ligante Indutor de Apoptose Relacionado a TNF/metabolismo , Distribuição Tecidual , Carga Tumoral
6.
Sci Rep ; 10(1): 13478, 2020 08 10.
Artigo em Inglês | MEDLINE | ID: mdl-32778787

RESUMO

Spread of pathogenic microbes and antibiotic-resistant bacteria in health-care settings and public spaces is a serious public health challenge. Materials that prevent solid surface colonization or impede touch-transfer of viable microbes could provide means to decrease pathogen transfer from high-touch surfaces in critical applications. ZnO and Ag nanoparticles have shown great potential in antimicrobial applications. Less is known about nano-enabled surfaces. Here we demonstrate that surfaces coated with nano-ZnO or nano-ZnO/Ag composites are not cytotoxic to human keratinocytes and possess species-selective medium-dependent antibiofilm activity against Escherichia coli, Staphylococcus aureus and Candida albicans. Colonization of nano-ZnO and nano-ZnO/Ag surfaces by E. coli and S. aureus was decreased in static oligotrophic conditions (no planktonic growth). Moderate to no effect was observed for bacterial biofilms in growth medium (supporting exponential growth). Inversely, nano-ZnO surfaces enhanced biofilm formation by C. albicans in oligotrophic conditions. However, enhanced C. albicans biofilm formation on nano-ZnO surfaces was effectively counteracted by the addition of Ag. Possible selective enhancement of biofilm formation by the yeast C. albicans on Zn-enabled surfaces should be taken into account in antimicrobial surface development. Our results also indicated the importance of the use of application-appropriate test conditions and exposure medium in antimicrobial surface testing.


Assuntos
Biofilmes/efeitos dos fármacos , Prata/farmacologia , Óxido de Zinco/farmacologia , Antibacterianos , Anti-Infecciosos , Bactérias/efeitos dos fármacos , Bactérias/crescimento & desenvolvimento , Biofilmes/crescimento & desenvolvimento , Candida albicans/crescimento & desenvolvimento , Escherichia coli/crescimento & desenvolvimento , Nanopartículas Metálicas/uso terapêutico , Testes de Sensibilidade Microbiana , Nanocompostos/uso terapêutico , Prata/metabolismo , Staphylococcus aureus/crescimento & desenvolvimento , Óxido de Zinco/metabolismo
7.
Macromol Biosci ; 20(10): e2000196, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32783352

RESUMO

One of the challenges facing by world nowadays is the generation of new pathogens that cause public health issues. Coronavirus (CoV) is one of the severe pathogens that possess the RNA (ribonucleic acid) envelop, and extensively infect humans, birds, and other mammals. The novel strain "SARS-CoV-2" (severe acute respiratory syndrome coronavirus-2) causes deadly infection all over the world and presents a pandemic situation nowadays. The SARS-CoV-2 has 40 different strains that create a worrying situation for health authorities. The virus develops serious pneumonia in infected persons and causes severe damage to the lungs. There is no vaccine available for this virus up to present. To cure this type of infections by making vaccines and antiviral drugs is still a major challenge for researchers. Nanotechnology covering a multidisciplinary field may find the solution to this lethal infection. The interaction of nanomaterials and microorganisms is considered as a potential treatment method because the nanomaterials owe unique physicochemical properties. The aim of this review is to present an overview of previous and recent studies of nanomaterials against coronaviruses and to provide possible new strategies for upcoming research using the nanotechnology platform.


Assuntos
Antivirais/farmacologia , Infecções por Coronavirus/diagnóstico , Infecções por Coronavirus/tratamento farmacológico , Nanoestruturas/uso terapêutico , Antivirais/química , Técnicas Biossensoriais , /química , Ouro/química , Humanos , Nanopartículas Metálicas/química , Nanopartículas Metálicas/uso terapêutico , Pontos Quânticos , Prata/química
8.
ACS Nano ; 14(8): 9364-9388, 2020 08 25.
Artigo em Inglês | MEDLINE | ID: mdl-32667191

RESUMO

The SARS-Cov-2 pandemic has spread worldwide during 2020, setting up an uncertain start of this decade. The measures to contain infection taken by many governments have been extremely severe by imposing home lockdown and industrial production shutdown, making this the biggest crisis since the second world war. Additionally, the continuous colonization of wild natural lands may touch unknown virus reservoirs, causing the spread of epidemics. Apart from SARS-Cov-2, the recent history has seen the spread of several viral pandemics such as H2N2 and H3N3 flu, HIV, and SARS, while MERS and Ebola viruses are considered still in a prepandemic phase. Hard nanomaterials (HNMs) have been recently used as antimicrobial agents, potentially being next-generation drugs to fight viral infections. HNMs can block infection at early (disinfection, entrance inhibition) and middle (inside the host cells) stages and are also able to mitigate the immune response. This review is focused on the application of HNMs as antiviral agents. In particular, mechanisms of actions, biological outputs, and limitations for each HNM will be systematically presented and analyzed from a material chemistry point-of-view. The antiviral activity will be discussed in the context of the different pandemic viruses. We acknowledge that HNM antiviral research is still at its early stage, however, we believe that this field will rapidly blossom in the next period.


Assuntos
Antivirais/uso terapêutico , Betacoronavirus , Infecções por Coronavirus/terapia , Nanoestruturas/uso terapêutico , Pandemias , Pneumonia Viral/terapia , Imunidade Adaptativa , Betacoronavirus/efeitos dos fármacos , Betacoronavirus/fisiologia , Betacoronavirus/ultraestrutura , Infecções por Coronavirus/epidemiologia , Infecções por Coronavirus/virologia , Sistemas de Liberação de Medicamentos , Fulerenos/uso terapêutico , Interações entre Hospedeiro e Microrganismos/efeitos dos fármacos , Humanos , Imunidade Inata , Nanopartículas Metálicas/uso terapêutico , Modelos Biológicos , Nanotecnologia , Pneumonia Viral/epidemiologia , Pneumonia Viral/virologia , Espécies Reativas de Oxigênio/uso terapêutico , Internalização do Vírus/efeitos dos fármacos
9.
Eur J Pharm Sci ; 153: 105465, 2020 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-32668312

RESUMO

COVID-19, is a disease resulting from the SARS-CoV-2 global pandemic. Due to the current global emergency and the length of time required to develop specific antiviral agent(s) and a vaccine for SARS-CoV-2, the world health organization (WHO) adopted the strategy of repurposing existing medications to treat COVID-19. Iron oxide nanoparticles (IONPs) were previously approved by the US food and drug administration (FDA) for anemia treatment and studies have also demonstrated its antiviral activity in vitro. Therefore, we performed a docking study to explore the interaction of IONPs (Fe2O3 and Fe3O4) with the spike protein receptor binding domain (S1-RBD) of SARS-CoV-2 that is required for virus attachment to the host cell receptors. A similar docking analysis was also performed with hepatitis C virus (HCV) glycoproteins E1 and E2. These studies revealed that both Fe2O3 and Fe3O4 interacted efficiently with the SARS-CoV-2 S1-RBD and to HCV glycoproteins, E1 and E2. Fe3O4 formed a more stable complex with S1-RBD whereas Fe2O3 favored HCV E1 and E2. These interactions of IONPs are expected to be associated with viral proteins conformational changes and hence, viral inactivation. Therefore, we recommend FDA-approved-IONPs to proceed for COVID-19 treatment clinical trials.


Assuntos
Infecções por Coronavirus/tratamento farmacológico , Compostos Férricos/uso terapêutico , Nanopartículas Metálicas/uso terapêutico , Simulação de Acoplamento Molecular , Pneumonia Viral/tratamento farmacológico , Aprovação de Drogas , Reposicionamento de Medicamentos , Humanos , Pandemias , Conformação Proteica , Glicoproteína da Espícula de Coronavírus/efeitos dos fármacos , Estados Unidos , United States Food and Drug Administration , Proteínas do Envelope Viral/efeitos dos fármacos , Proteínas do Envelope Viral/metabolismo
10.
PLoS One ; 15(7): e0236245, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32706818

RESUMO

We have previously demonstrated that endothelial targeting of gold nanoparticles followed by external beam irradiation can cause specific tumor vascular disruption in mouse models of cancer. The induced vascular damage may lead to changes in tumor physiology, including tumor hypoxia, thereby compromising future therapeutic interventions. In this study, we investigate the dynamic changes in tumor hypoxia mediated by targeted gold nanoparticles and clinical radiation therapy (RT). By using noninvasive whole-body fluorescence imaging, tumor hypoxia was measured at baseline, on day 2 and day 13, post-tumor vascular disruption. A 2.5-fold increase (P<0.05) in tumor hypoxia was measured two days after combined therapy, resolving by day 13. In addition, the combination of vascular-targeted gold nanoparticles and radiation therapy resulted in a significant (P<0.05) suppression of tumor growth. This is the first study to demonstrate the tumor hypoxic physiological response and recovery after delivery of vascular-targeted gold nanoparticles followed by clinical radiation therapy in a human non-small cell lung cancer athymic Foxn1nu mouse model.


Assuntos
Carcinoma Pulmonar de Células não Pequenas , Neoplasias Pulmonares , Nanopartículas Metálicas/uso terapêutico , Hipóxia Tumoral , Células A549 , Animais , Carcinoma Pulmonar de Células não Pequenas/irrigação sanguínea , Carcinoma Pulmonar de Células não Pequenas/tratamento farmacológico , Carcinoma Pulmonar de Células não Pequenas/radioterapia , Ouro/uso terapêutico , Humanos , Neoplasias Pulmonares/irrigação sanguínea , Neoplasias Pulmonares/tratamento farmacológico , Neoplasias Pulmonares/radioterapia , Camundongos , Camundongos Nus , Imagem Óptica/métodos , Hipóxia Tumoral/efeitos dos fármacos , Hipóxia Tumoral/efeitos da radiação , Ensaios Antitumorais Modelo de Xenoenxerto
11.
Sci Rep ; 10(1): 10011, 2020 06 19.
Artigo em Inglês | MEDLINE | ID: mdl-32561796

RESUMO

Chitosan oligosaccharide functionalized silver nanoparticles with synergistic bacterial activity were constructed as a multivalent inhibitor of bacteria. Placing the chitosan oligosaccharide on silver nanoparticles can dramatically enhance the adsorption to the bacterial membrane via multivalent binding. The multicomponent nanostructures can cooperate synergistically against gram-positive and gram-negative bacteria. The antibacterial activity was increased via orthogonal array design to optimize the synthesis condition. The synergistic bacterial activity was confirmed by fractional inhibitory concentration and zone of inhibition test. Through studies of antimicrobial action mechanism, it was found that the nanocomposites interacted with the bacteria by binding to Mg2+ ions of the bacterial surface. Then, the nanocomposites disrupted bacterial membrane by increasing the permeability of the outer membrane, resulting in leakage of cytoplasm. This strategy of chitosan oligosaccharide modification can increase the antibacterial activity of silver nanoparticles and accelerate wound healing at the same time. The nanomaterial without cytotoxicity has promising applications in bacteria-infected wound healing therapy.


Assuntos
Antibacterianos/farmacologia , Infecções Bacterianas/tratamento farmacológico , Quitosana/farmacologia , Escherichia coli/efeitos dos fármacos , Nanocompostos/uso terapêutico , Oligossacarídeos/farmacologia , Staphylococcus aureus/efeitos dos fármacos , Antibacterianos/uso terapêutico , Quitosana/química , Quitosana/uso terapêutico , Humanos , Nanopartículas Metálicas/química , Nanopartículas Metálicas/uso terapêutico , Nanocompostos/química , Oligossacarídeos/química , Oligossacarídeos/uso terapêutico , Prata/química
12.
Khirurgiia (Mosk) ; (5): 81-86, 2020.
Artigo em Russo | MEDLINE | ID: mdl-32500694

RESUMO

Increase of the frequency of soft tissues pyoinflammatory diseases and purulent-septic complications against the background the antibiotic-resistance of organism dictates the necessity of search of rational new surgical technologies and preparations with the intense bactericidal effect. Period of the connective tissue (cicatrix) formation on a place of wound defect of the operated purulent abscess of soft tissue (PAST) is defined by the speed of the granulations and epithelial tissue formation. Therefore, one of the task of experimental surgery is search of new methods of the effective postoperative influence on terms of the regeneration and complete obliteration of the PAST cavity. The perspective direction in treatment of surgical infection is application of metals nanoparticles. In treatment of pyoinflammatory processes it is applied the preparation Eplan and also zinc oxide nanoparticles which have bactericidal, antiinflammatory and regenerative effects. However, till now it was not carried out experimental works on modelling and surgical treatment of PAST with local application of the laser technologies in combinations with Eplan and metals nanoparticles.


Assuntos
Abscesso/terapia , Antibacterianos/uso terapêutico , Nanopartículas Metálicas/uso terapêutico , Infecções dos Tecidos Moles/terapia , Abscesso/tratamento farmacológico , Abscesso/cirurgia , Antibacterianos/administração & dosagem , Combinação de Medicamentos , Humanos , Terapia a Laser , Nanopartículas Metálicas/administração & dosagem , Pomadas/administração & dosagem , Pomadas/uso terapêutico , Infecções dos Tecidos Moles/tratamento farmacológico , Infecções dos Tecidos Moles/cirurgia , Supuração/tratamento farmacológico , Supuração/cirurgia , Supuração/terapia , Óxido de Zinco/administração & dosagem , Óxido de Zinco/uso terapêutico
13.
Int J Nanomedicine ; 15: 3791-3801, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32547028

RESUMO

Purpose: Paclitaxel is a generic drug produced based on Taxol which is an extract of Taxus tree, well known for its anticancer and antibacterial effects. This study was aimed at building up an agent with the antibacterial and anticancer benefits of both the silver ions and Taxol, together with less cytotoxic effects. Materials and Methods: Colloidal silver nanoparticles (AgNPs) were synthesized by reducing aqueous AgNO3 with aqueous Taxus leaf extract at nonphotomediated conditions, without any catalyst, template or surfactant. The AgNP production was confirmed by ultraviolet-visible (UV-VIS) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier-transform infrared (FTI) spectroscopy. The MTT assay for human breast cancer cells as well as the DAPI fluorescent staining microscopy tested the biocompatibility and anticancer effects of AgNPs, silver nitrate, and Taxol. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) techniques were performed to determine the shape and size of the nanoparticles. MTT assay showed the best inhibitory concentration of AgNPs on cancer cells. The antibacterial activity of the three case study materials was tested for gram-positive (Staphylococcus aureus) and gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa) using well diffusion test. Results: This work proposes more anticancer effects for AgNP made by Taxus brevifolia extract, comparing Taxol solution. IC50 was observed as 3.1 mM for Taxol while 1.5 mM for new AgNP. Moreover, Taxus showed no antibacterial effects while the new AgNP showed a dose-dependent biocompatibility along with slightly more antibacterial effects (MIC: 1.6 and 6.6mM for gram-positive and -negative bacteria, respectively) comparing with silver nitrate solution (MIC: 1.5 and 6.2 mM for gram-positive and -negative bacteria, respectively). Conclusion: The production of herbal-mediated silver nanoparticles may be an efficient substitution for the silver nitrate-based medicines with less side effects.


Assuntos
Antibacterianos/farmacologia , Antineoplásicos/farmacologia , Química Verde/métodos , Nanopartículas Metálicas/uso terapêutico , Prata/farmacologia , Taxus/química , Difusão Dinâmica da Luz , Escherichia coli/efeitos dos fármacos , Humanos , Células MCF-7 , Nanopartículas Metálicas/química , Nanopartículas Metálicas/ultraestrutura , Testes de Sensibilidade Microbiana , Tamanho da Partícula , Extratos Vegetais/química , Staphylococcus aureus/efeitos dos fármacos
14.
Phys Med Biol ; 65(21): 21RM02, 2020 10 22.
Artigo em Inglês | MEDLINE | ID: mdl-32380492

RESUMO

This roadmap outlines the potential roles of metallic nanoparticles (MNPs) in the field of radiation therapy. MNPs made up of a wide range of materials (from Titanium, Z = 22, to Bismuth, Z = 83) and a similarly wide spectrum of potential clinical applications, including diagnostic, therapeutic (radiation dose enhancers, hyperthermia inducers, drug delivery vehicles, vaccine adjuvants, photosensitizers, enhancers of immunotherapy) and theranostic (combining both diagnostic and therapeutic), are being fabricated and evaluated. This roadmap covers contributions from experts in these topics summarizing their view of the current status and challenges, as well as expected advancements in technology to address these challenges.


Assuntos
Nanopartículas Metálicas/uso terapêutico , Nanomedicina Teranóstica/métodos , Humanos , Hipertermia Induzida
15.
Inorg Chem ; 59(13): 9177-9187, 2020 Jul 06.
Artigo em Inglês | MEDLINE | ID: mdl-32447953

RESUMO

By taking advantage of the efficient Förster resonance energy transfer (FRET) between near-infrared (NIR)-responsive lanthanide-doped upconversion nanoparticles (UCNPs) and Fenton reagent ferrocenyl compounds (Fc), a series of Fc-UCNPs was designed by functionalizing NaYF4:Yb,Tm nanoparticles with Fc1-Fc5 via surface-coordination chemistry. Fc-UCNP-Lipo nanosystems were then constructed by encapsulating Fc-UCNP inside liposomes for efficient delivery. Fc-UCNP can effectively release ·OH via a NIR-promoted Fenton-like reaction. In vitro and in vivo studies of Fc1-UCNP-Lipo confirmed the preferential accumulation in a tumor site followed by an enhanced uptake of cancer cells. After cellular internalization, the released Fc1-UCNP can effectively promote ·OH generation for tumor growth suppression. Such a Fc1-UCNP-Lipo nanosystem exhibits advantages such as easy fabrication, low drug dosage, and no ferrous ion release.


Assuntos
Antineoplásicos/uso terapêutico , Compostos Ferrosos/uso terapêutico , Nanopartículas Metálicas/uso terapêutico , Metalocenos/uso terapêutico , Neoplasias/tratamento farmacológico , Animais , Antineoplásicos/síntese química , Antineoplásicos/efeitos da radiação , Linhagem Celular Tumoral , Portadores de Fármacos/química , Feminino , Compostos Ferrosos/química , Compostos Ferrosos/efeitos da radiação , Humanos , Raios Infravermelhos , Lipossomos/química , Nanopartículas Metálicas/química , Nanopartículas Metálicas/efeitos da radiação , Metalocenos/química , Metalocenos/efeitos da radiação , Camundongos Endogâmicos BALB C , Neoplasias/patologia , Térbio/química , Térbio/efeitos da radiação , Ensaios Antitumorais Modelo de Xenoenxerto , Ítrio/química , Ítrio/efeitos da radiação
16.
Int J Nanomedicine ; 15: 2829-2839, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32368057

RESUMO

Objective: To investigate the remineralizing and staining effects of sodium fluoride (NaF) solution with polyethylene glycol-coated silver nanoparticles (PEG-AgNPs) on artificial dentine caries. Materials and Methods: Demineralized human dentine blocks were allocated to three groups. The blocks in group 1 underwent a topical application of a 12% silver diamine fluoride (SDF, 14,150 ppm fluoride) solution. The blocks in group 2 received a topical application of a 2.5% NaF (11,310 ppm fluoride) with PEG-AgNPs (400 ppm silver). The blocks in group 3 received deionized water. All blocks were subjected to pH cycling for 8 days. The surface morphology and cross-sectional features were investigated using scanning electron microscopy (SEM). The color parameters, crystal characteristics, lesion depth, and collagen degradation of the blocks were assessed using digital spectrophotometry, X-ray diffraction (XRD), micro-computed tomography, and spectrophotometry with a hydroxyproline assay, respectively. Results: The SEM showed that dentine collagen was exposed in group 3 but not in groups 1 and 2. The mean lesion depths in groups 1 to 3 were 118±7 µm, 121±14 µm, and 339±20 µm, respectively (groups1,2<3; p<0.001). The data indicated that fluoridated PEG-AgNPs introduced no significant color effect on dentine, but SDF caused distinct discoloration. The XRD indicated that silver chloride was formed in group 1, and fluorapatite was detected in groups 1 and 2. The concentration of hydroxyproline liberated from collagen was significantly less in groups 1 and 2 than in group 3. Conclusion: The use of NaF solution with PEG-AgNPs can remineralize artificial dentine caries and inhibit collagen degradation without causing significant tooth staining.


Assuntos
Cárie Dentária/tratamento farmacológico , Dentina/efeitos dos fármacos , Nanopartículas Metálicas/uso terapêutico , Fluoreto de Sódio/farmacologia , Remineralização Dentária/métodos , Colágeno , Cor , Dentina/metabolismo , Dentina/patologia , Fluoretos/farmacologia , Fluoretos Tópicos/química , Fluoretos Tópicos/farmacologia , Humanos , Hidroxiprolina/metabolismo , Nanopartículas Metálicas/administração & dosagem , Nanopartículas Metálicas/química , Microscopia Eletrônica de Varredura , Dente Serotino/efeitos dos fármacos , Dente Serotino/patologia , Dente Serotino/ultraestrutura , Polietilenoglicóis/química , Compostos de Amônio Quaternário/química , Compostos de Amônio Quaternário/farmacologia , Prata , Compostos de Prata/química , Compostos de Prata/farmacologia , Fluoreto de Sódio/administração & dosagem , Difração de Raios X , Microtomografia por Raio-X
17.
Exp Parasitol ; 215: 107915, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32461112

RESUMO

Acanthamoeba castellanii is an opportunistic protozoan responsible for serious human infections including Acanthamoeba keratitis and granulomatous amoebic encephalitis. Despite advances in antimicrobial therapy and supportive care, infections due to Acanthamoeba are a major public concern. Current methods of treatment are not fully effective against both the trophozoite and cyst forms of A. castellanii and are often associated with severe adverse effects, host cell cytotoxicity and recurrence of infection. Therefore, there is an urgent need to develop new therapeutic approaches for the treatment and management of Acanthamoebic infections. Repurposing of clinically approved drugs is a viable avenue for exploration and is particularly useful for neglected and rare diseases where there is limited interest by pharmaceutical companies. Nanotechnology-based drug delivery systems offer promising approaches in the biomedical field, particularly in diagnosis and drug delivery. Herein, we conjugated an antihyperglycemic drug, metformin with silver nanoparticles and assessed its anti-acanthamoebic properties. Characterization by ultraviolet-visible spectrophotometry and atomic force microscopy showed successful formation of metformin-coated silver nanoparticles. Amoebicidal and amoebistatic assays revealed that metformin-coated silver nanoparticles reduced the viability and inhibited the growth of A. castellanii significantly more than metformin and silver nanoparticles alone at both 5 and 10 µM after 24 h incubation. Metformin-coated silver nanoparticles also blocked encystation and inhibited the excystation in Acanthamoeba after 72 h incubation. Overall, the conjugation of metformin with silver nanoparticles was found to enhance its antiamoebic effects against A. castellanii. Furthermore, the pretreatment of A. castellanii with metformin and metformin-coated silver nanoparticles for 2 h also reduced the amoebae-mediated host cell cytotoxicity after 24 h incubation from 73% to 10% at 10 µM, indicating that the drug-conjugated silver nanoparticles confer protection to human cells. These findings suggest that metformin-coated silver nanoparticles hold promise in the improved treatment and management of Acanthamoeba infections.


Assuntos
Acanthamoeba castellanii/efeitos dos fármacos , Metformina/administração & dosagem , Ceratite por Acanthamoeba/tratamento farmacológico , Ceratite por Acanthamoeba/parasitologia , Anti-Infecciosos Locais/farmacologia , Infecções Protozoárias do Sistema Nervoso Central/tratamento farmacológico , Infecções Protozoárias do Sistema Nervoso Central/parasitologia , Clorexidina/farmacologia , Células HeLa , Humanos , Encefalite Infecciosa/tratamento farmacológico , Encefalite Infecciosa/parasitologia , Nanopartículas Metálicas/administração & dosagem , Nanopartículas Metálicas/uso terapêutico , Metformina/farmacologia , Metformina/uso terapêutico , Microscopia de Força Atômica , Encistamento de Parasitas/efeitos dos fármacos , Prata , Espectrofotometria Ultravioleta , Trofozoítos/efeitos dos fármacos
18.
Nanoscale ; 12(14): 7604-7621, 2020 Apr 14.
Artigo em Inglês | MEDLINE | ID: mdl-32232245

RESUMO

In recent days, vanadium complexes and nanoparticles have received sustainable attention owing to their vast applications in different fields. In the present study, we report a facile approach for the synthesis of irregular dumbbell shaped vanadium pentoxide nanoparticles (V2O5 NPs: 30-60 nm) via the polyol-induced microwave irradiation process along with calcination. The as-synthesized nanoparticles were characterized using various physico-chemical techniques (e.g. XRD, TEM, FT-IR, DLS and XPS). The cell viability assay showed that V2O5 NPs could efficiently inhibit the proliferation of different cancer cells (B16F10, A549, and PANC1), depicting their anti-proliferative activity. However, V2O5 NPs did not exert significant cytotoxicity to the normal cells (CHO, HEK-293 and NRK-49F), suggesting their biocompatible nature. Interestingly, these nanoparticles inhibited the proliferation and migration of the endothelial cells (HUVECs and EA.hy926) and disrupted the blood vasculature in a chick embryo model, indicating their anti-angiogenic properties. The mechanistic study revealed that the effective internalization of V2O5 NPs generated intracellular reactive oxygen species (ROS) which in turn up-regulated p53 protein and down-regulated survivin protein in cancer cells, leading to the apoptosis process. Furthermore, the administration of V2O5 NPs to melanoma bearing C57BL6/J mice significantly increased their survivability as compared to the control untreated tumor bearing mice, exhibiting the therapeutic potential of the nanoparticles against melanoma. Additionally, the in vivo toxicity study demonstrated no toxic effect in mice upon sub-chronic exposure to V2O5 NPs. Altogether, we strongly believe that V2O5 NPs could intrinsically provide a new direction for alternative therapeutic treatment strategies for melanoma and other cancers by employing their anti-angiogenic properties in the future.


Assuntos
Nanopartículas Metálicas/química , Neovascularização Fisiológica , Compostos de Vanádio/química , Animais , Apoptose/efeitos dos fármacos , Materiais Biocompatíveis/química , Materiais Biocompatíveis/farmacologia , Materiais Biocompatíveis/uso terapêutico , Pontos de Checagem do Ciclo Celular/efeitos dos fármacos , Linhagem Celular , Movimento Celular/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Embrião de Galinha , Eritrócitos/citologia , Eritrócitos/efeitos dos fármacos , Eritrócitos/metabolismo , Feminino , Hemólise/efeitos dos fármacos , Humanos , Melanoma Experimental/tratamento farmacológico , Melanoma Experimental/patologia , Nanopartículas Metálicas/uso terapêutico , Nanopartículas Metálicas/toxicidade , Camundongos , Camundongos Endogâmicos C57BL , Neovascularização Fisiológica/efeitos dos fármacos , Espécies Reativas de Oxigênio/metabolismo , Transplante Homólogo
19.
Carbohydr Polym ; 238: 116175, 2020 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-32299548

RESUMO

The current study is pertaining to develop a novel wound dressing, comprising natural biologically absorbable materials for wound healing In-vivo. Wound dressing is composed of Polygalacturonic acid, Hyaluronic acid embedded silver nanoparticles, which is further fabricated to form nanofibrous mat, using electrospinning. Silver nanoparticles was prepared using PGA. AgNPs in this formula will serve as an antioxidant and anti-inflammatory that protect cells from destructive effect of elevated ROS and accelerate wound healing. The physical performance and water contact angle for nanofiber was evaluated. The produced nanofiber was characterized by Fourier-transform infrared (FTIR), scanning electron microscopy and thermal analysis. Also, the embedded AgNPs was also characterized by UV-vis spectroscopy and TEM. The nanofiber mates embedded AgNPs was applied to the wounded site of albino rats in-vivo. Histopathological assessment for the wound was fully performed. Also, the antimicrobial activity for the fabricated wound dressing was evaluated against gram+ve and gram -ve bacteria.


Assuntos
Antibacterianos/farmacologia , Bactérias/efeitos dos fármacos , Bandagens , Nanopartículas Metálicas/uso terapêutico , Nanofibras/uso terapêutico , Prata/farmacologia , Cicatrização/efeitos dos fármacos , Animais , Ácido Hialurônico/química , Masculino , Pectinas/química , Ratos , Prata/química
20.
Int J Nanomedicine ; 15: 2231-2258, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32280217

RESUMO

Rapid emergence of aggressive, multidrug-resistant Mycobacteria strain represents the main cause of the current antimycobacterial-drug crisis and status of tuberculosis (TB) as a major global health problem. The relatively low-output of newly approved antibiotics contributes to the current orientation of research towards alternative antibacterial molecules such as advanced materials. Nanotechnology and nanoparticle research offers several exciting new-concepts and strategies which may prove to be valuable tools in improving the TB therapy. A new paradigm in antituberculous therapy using silver nanoparticles has the potential to overcome the medical limitations imposed in TB treatment by the drug resistance which is commonly reported for most of the current organic antibiotics. There is no doubt that AgNPs are promising future therapeutics for the medication of mycobacterial-induced diseases but the viability of this complementary strategy depends on overcoming several critical therapeutic issues as, poor delivery, variable intramacrophagic antimycobacterial efficiency, and residual toxicity. In this paper, we provide an overview of the pathology of mycobacterial-induced diseases, andhighlight the advantages and limitations of silver nanoparticles (AgNPs) in TB treatment.


Assuntos
Antituberculosos/farmacologia , Nanopartículas Metálicas/uso terapêutico , Prata/farmacologia , Tuberculose/tratamento farmacológico , Antituberculosos/química , Humanos , Nanopartículas Metálicas/química , Infecções por Mycobacterium/tratamento farmacológico , Mycobacterium tuberculosis/efeitos dos fármacos , Mycobacterium tuberculosis/patogenicidade , Prata/química , Tuberculose Resistente a Múltiplos Medicamentos/tratamento farmacológico
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