IET nanobiotechnology最新文献

A characteristic of many neurodegenerative disorders, such as Parkinson’s and Alzheimer’s, is amyloidogenic protein aggregation, for which there are currently no proven cures. Aging, mutation, and physiological stress can cause proteins to deviate from their natural folding patterns, potentially leading to the formation of hazardous protein aggregates. Noble metal nanoparticles (NPs), due to their unique physicochemical properties, have emerged as promising tools in biomedicine, with applications ranging from tissue engineering to drug delivery and diagnostics. Although concerns regarding cytotoxicity exist, small-sized silver (Ag) NPs (AgNPs) have demonstrated potential in antiviral, anticancer, and antibacterial therapies. This study investigated the development of biocompatible AgNPs using a green synthesis approach and examined their chaperone-like activity against protein aggregation, emphasizing the role of meticulous in vitro design. Human lysozyme (HLZ) served as a model protein for aggregation inhibition assays. Biogenic AgNPs exhibited a concentration-dependent effect on HLZ aggregation, demonstrating an optimal inhibitory concentration, followed by a decrease in efficacy at higher concentrations. Furthermore, astrocytes treated with AgNPs displayed reduced protein aggregation, suggesting a chaperone-like behavior. The initial phase focused on the detailed characterization of AgNPs synthesized using orange juice extract. Subsequently, this study explored the mechanistic understanding of AgNP-mediated inhibition of protein aggregation under controlled conditions. A battery of biophysical techniques, including circular dichroism (CD), 8-anilino-1-naphthalene-sulfonic acid (ANS) fluorescence, thioflavin T (ThT) fluorescence, Congo red (CR) assay, and turbidity measurements, was employed to meticulously assess the inhibitory effect on HLZ aggregation in vitro.

Herpes simplex virus type 1 (HSV-1) is responsible for the majority of cold sores, herpetic keratitis-induced blindness, profound skin lesions, and encephalitis that can be fatal. Currently, acyclovir and its derivatives are the first-line therapy for the treatment of HSV-1 infection. But there are drawbacks to these treatments: limited efficacy against drug-resistant strains of the virus. Hence, it is of critical importance to explore and develop new antiviral drugs for HSV-1. In the present study, we explored whether tungsten oxide nanoparticles (WO₃NPs) were potent inhibitors of HSV-1 infection as a new class of agent. WO₃NPs were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy, and zeta potential analysis. Cytotoxicity of Vero cells caused by WO₃NPs was determined by methyl thiazolyl tetrazolium (MTT) assay. The quantitative real-time polymerase chain reaction (qRT-PCR) assay was utilized for further verification of the action of the WO₃NPs on HSV-1. The cytotoxicity test showed low toxicity (<20%) of the rod-shaped WO₃NPs when they were assayed on Vero cells at concentrations of up to 700 μg/mL. When HSV-1 was treated with WO₃NPs at 700 µg/mL [20% cytotoxicity concentration (CC₂₀); the concentration causing 20% cytotoxicity, ~80% cell viability] and 1000 µg/mL [50% cytotoxicity concentration (CC₅₀); the concentration causing 50% cytotoxicity, ~50% cell viability] for 3 h, the viral load was significantly reduced, achieving inhibition rates of 99.4% and 99.9%, respectively. Additionally, experiments conducted after HSV-1 infection of Vero cells (post-treatment assays) indicated that WO₃NPs at concentrations of 250, 500, and 750 µg/mL significantly suppressed viral replication, with inhibition rates of 82%, 87.5%, and 96.5%, respectively. WO₃NPs have potent inhibitory effects on HSV-1. Therefore, they can be considered potential candidates for therapeutic development against infections caused by this virus.

The stem rust disease caused by obligate biotrophic fungus Puccinia graminis f. sp. tritici is a worldwide threat to the global wheat production with frequent epidemics leading to widespread reliance on chemical fungicides such as cyproconazole. To reduce fungicide risks on human health and environmental integrity, chitosan nanoparticles (CNPs) and novel chitosan–cyproconazole nanocomposite (Chi-Cyp) were synthesized. Dynamic light scattering (DLS) and Fourier transform infrared (FTIR) spectroscopy confirmed the size of 80–90 nm and surface charge and uniformity. To evaluate their efficacy against the disease, various concentrations of CNP and Chi-Cyp were applied via irrigation, foliar spray, and a combination of both methods. Wheat seedlings were treated 24 h prior to inoculation, as well as at 48- and 96-h post-inoculation with Pgt urediniospores. Phenotypic assessments conducted 2 weeks post-inoculation revealed that CNPs (100 μg/mL) and Chi-Cyp (1 μg/mL), along with the positive control cyproconazole (10 μg/mL), significantly suppressed stem rust infection. Quantitative polymerase chain reaction (qPCR) analysis corroborated these findings, demonstrating a substantial reduction in fungal biomass in treated plants. Additionally, the impact of the nanomaterials on plant growth parameters was examined. Notably, Chi-Cyp treatment at 50 μg/mL significantly enhanced seedling growth, as evidenced by increased shoot and root lengths, and elevated fresh and dry biomass accumulation. This study highlights the potential of the Chi-Cyp nanocomposite, which contains a 10-fold lower concentration of cyproconazole, to effectively control stem rust with comparable efficacy to the fungicide alone. These findings underscore the promise of nanotechnology-based strategies in sustainable plant disease management.

The study aims to fabricate eco-friendly, biogenic magnesium oxide nanoparticles (MgO NPs) mediated by ethanol-guar gum extract, which acts as both a reducing and coating/stabilizing agent. The prepared MgO NPs were first synthesized and characterized by various analytical techniques, including UV–visible, FTIR spectroscopy, SEM-energy-dispersive X-ray spectroscopy (EDS) mapping, and X-ray diffraction (XRD) crystallography. Bioactivity studies included antibacterial studies focusing on the inhibition of a dental caries-causing pathogen, Enterococcus faecalis, by MIC, MBC, well diffusion (WD) agar, antibiofilm, and time-kill (TK) assays. Furthermore, the antioxidant activity and cytotoxicity of MgO NPs were examined. A bacterial adherence study was conducted as the main aim by exposing the bacteria to human teeth in vitro. Findings demonstrated that biogenic MgO NPs were successfully synthesized with flaky morphologies, with an average size of 20–30 nm and the desired purity. FTIR showed possible functional groups, confirming the involvement of guar metabolites in NP formation. The XRD pattern elucidated the crystalline phase of MgO NPs to be a cubic (FCC) periclase structure with a crystallite size of 16.5 nm. Antibacterial experiments showed that MgO NPs had a moderate effect on Enterococcus faecalis, with MIC and MBC of 32 and 64 µg/mL, respectively. In contrast, chlorhexidine (CHX), doxycycline (Dox), and sodium hypochlorite (NaClO) were more effective, while the guar extract showed the weakest inhibition; additionally, antibiofilm assessments were followed by antibacterial outcomes. However, cytotoxicity studies exhibited the least toxicity for MgO NPs compared with other compounds. The dental adherence test also showed that MgO NPs can inhibit bacterial interactions with the dental surface without inhibiting bacterial growth at sub-MIC concentrations. Meanwhile, other groups killed them rapidly before they could adhere to teeth. Here, biocompatibility and long-term antibacterial effectiveness were advantages of biogenic MgO NPs over other compounds that have been shown to be toxic to the host over long-term consumption. Therefore, guar extract-mediated MgO NPs demonstrated that they can be a favorable alternative for biofilm control in dental health without toxicity to related tissues in the oral cavity.

This study presents an environmentally friendly and nontoxic method for the selective separation and removal of trace amounts. A magnetic nanocomposite made of Fe₃O₄/chitosan–acrylic acid was utilized to separate and remove Cu²⁺ ions using its magnetic properties. Various characterization techniques, including Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analyzer (TGA), and VSM, were employed to investigate and identify the nanocomposite. Additionally, the research discusses adsorption isotherm models related to the adsorption of Cu²⁺ ions. The maximum adsorption capacity of the biodegradable Fe₃O₄/chitosan–acrylic acid nanocomposite for Cu²⁺ ions was found to be 30.68 mg/g. The adsorption process followed the Freundlich isotherm model when using the Fe₃O₄/chitosan–acrylic acid adsorbent. The method exhibited a linear range of 10–1000 µg/L for Cu²⁺ ions, with a limit of detection (LOD) of 0.15 μg/L for the adsorption of Cu²⁺ ions by the Fe₃O₄/chitosan–acrylic acid adsorbent. These findings indicate that Fe₃O₄/chitosan–acrylic is a high-performance adsorbent for removing Cu²⁺ ions from tap, well, river, and spring water samples.

This study investigates the development of nanoparticles derived from algal polysaccharides and evaluates their physicochemical properties, antioxidant capacity, and anti-inflammatory activity in comparison to their native counterparts. Polysaccharides extracted from Sargassum (SP), Ulva (UP), and Porphyra (PP) were subjected to dry-heating at various temperatures to form nanoparticles. The prepared polysaccharides and nanoparticles were characterized by molecular weight distribution, monosaccharide composition, yield, morphology, particle size, sulfate content, and functional group profiles, respectively. The nanoparticles were spherical in form, with diameter less than 500 nm. Furthermore, their polydispersity index (PDI) was observed to be lower than 0.4, and their zeta potentials ranged from −5 to −30 mV. Dry-heating above 210°C induced notable alterations in functional groups, while temperatures above 150°C significantly enhanced DPPH radical scavenging and Fe²⁺ chelation activities. The nanoparticles showcased enhanced antioxidant and anti-inflammatory capabilities when juxtaposed with crude polysaccharides. Specifically, they led to a significant suppression of lipopolysaccharide (LPS)-induced generation of key pro-inflammatory molecules in macrophages. Importantly, the nanoparticles exhibited no cytotoxicity at concentrations below 1000 μg/mL. These findings suggest that algal polysaccharide-based nanoparticles, particularly those formed at higher temperatures, hold considerable potential as bioactive agents in therapeutic applications.

Cancer remains a major global health challenge, with radiotherapy (RT) being a cornerstone of treatment. However, the efficacy of RT is significantly hindered by hypoxic tumor microenvironments (TMEs) and nonselective toxicity to healthy tissues. Recent advancements in combining bacteria and nanoparticles have shown promise in addressing these limitations. Cyanobacteria, with their oxygen-producing capabilities, alleviate tumor hypoxia, while anaerobic bacteria selectively target hypoxic regions. Nanoparticles complement these approaches by enhancing bacterial localization and amplifying radiosensitization through reactive oxygen species (ROS) generation and other synergistic therapies. Unlike previous reviews that have mainly focused on either bacterial therapy or nanoparticle-assisted radiosensitization separately, this review provides a comparative and integrative perspective on their combined use, emphasizing the novelty of synergistic strategies. This review explores innovative bacterial–nanoparticle integrations, highlighting their roles in overcoming hypoxia and improving RT outcomes. The potential of these strategies to transform cancer treatment is discussed, alongside challenges and future directions.

Neuroprotection is well known for its strategies and interventions that help preserve the structure and function of neurons during a myriad of neurological challenges. It is fundamental in managing the complex relationship between neuroinflammation and obesity, both of which are significant factors affecting our neurological health. In the present review, we try to merge nanoparticles with artificial intelligence (AI) to tackle the neurological implications of both conditions. This review summarizes prior studies of free radical-scavenging nanoparticles: polymeric, liposomal, ceria-based, and quantum dots, and evaluates their reported efficacy in attenuating markers of neuroinflammation and neuronal dysfunction in preclinical models. We have also discussed AI applications, such as predictive modeling and real-time monitoring, stating that they present a complementary role in themselves. There is recognition that the promise of nanoparticles in mitigating neurological problems underscores the potential of AI in upgrading neuroprotection. Early-phase clinical trials of free radical-scavenging nanoparticles have highlighted the importance of patient stratification to optimize personalized treatment regimens. Furthermore, we advocate coordinated efforts in education, awareness, and research to integrate scientific findings, public policy, and technology innovation, thereby holistically addressing neuroinflammation and obesity at the individual level.

Zeolites are crystalline aluminosilicate materials known for their unique structures and small pores, making them highly suitable for various applications, including antimicrobial uses. Their porous surfaces enable them to act as carriers for metal ions, enhancing their antibacterial potential. A recent comprehensive review of the literature assessed the antibacterial activity of both natural and synthetic zeolites, with a specific focus on their performance after being modified with metal ions. The study confirmed that while unmodified zeolites possess some inherent antibacterial properties, their effectiveness is generally limited to high concentrations. In contrast, zeolites modified with metal ions, such as silver (Ag), copper (Cu), or zinc (Zn), demonstrate significantly enhanced antimicrobial effects at much lower concentrations. Among the metal-modified zeolites, Ag-treated zeolite A (ZA) emerged as the most effective, exhibiting a remarkably low minimum inhibitory concentration (MIC) of just 16 µg/mL against various bacterial strains. This heightened activity is attributed to the controlled release of Ag ions and the high ion-exchange capacity of ZA, which allows for sustained antimicrobial action. These findings suggest that metal-exchanged zeolites, particularly those with high ion-retention capabilities, hold strong potential as long-lasting and efficient antimicrobial agents. Such materials could be valuable in medical, environmental, and industrial applications, especially where bacterial resistance is a growing concern.

Platelet-derived extracellular vesicles (pEVs) are a potent fraction of platelet concentrates, enhancing their therapeutic potential in regenerative medicine. This study evaluates pEV from three platelet sources: platelet lysate (PL), fresh platelets (fPs), and aged platelets (aPs), to determine how activation and storage conditions affect pEV characteristics, functionality, and molecular content. pEV are isolated using size exclusion chromatography (SEC) and characterized by transmission electron microscopy (TEM), western blot, and nanoparticle tracking analysis (NTA). Functional assays include wound healing, metabolic activity, and cytotoxicity. Protein and miRNA profiles are obtained through LC-MS/MS and miRNA arrays, followed by bioinformatic analysis. Findings show that PL-derived pEV exhibits the highest yield and purity, containing markers CD63 and CD9. Enhanced fibroblast migration in wound healing assays suggest a critical role for PL-pEV in hemostasis, proliferation, and remodeling phases. Multiomics analysis identifies upregulated miRNAs, particularly miR-210-3p and the miR-320 family, associated with wound healing. Differential protein analysis reveals an enrichment in immune response and wound healing pathways within PL-pEV. These results demonstrate the impact of platelet preparation methods on pEV molecular cargo and efficacy, with hsa-miR-320a, hsa-miR-320b, and hsa-miR-210-3p identified as key mediators supporting the clinical potential of PL-pEV in regenerative medicine.