Toxic potential of materials at the nanolevel

Advances of functional nanomaterials as either therapeutic agents or delivery systems in the treatment of periodontitis

Periodontitis is a common chronic inflammatory disease primarily caused by pathogenic microorganisms in the oral cavity. Without appropriate treatments, it may lead to the gradual destruction of the supporting tissues of the teeth. While current treatments can alleviate symptoms, they still have limitations, particularly in eliminating pathogenic bacteria, promoting periodontal tissue regeneration, and avoiding antibiotic resistance. In recent years, functional nanomaterials have shown great potential in the treatment of periodontitis due to their unique physicochemical and biological properties. This review summarizes various functionalization strategies of nanomaterials and explores their potential applications in periodontitis treatment, including metal-based nanoparticles, carbon nanomaterials, polymeric nanoparticles, and exosomes. The mechanisms and advances in antibacterial effects, immune regulation, reactive oxygen species (ROS) scavenging, and bone tissue regeneration are discussed in detail. In addition, the challenges and future directions of applying nanomaterials in periodontitis therapy are also discussed.

Effect of nanomaterials on microbial metabolism and their applications in fermentative hydrogen production: A review

Recent developments in nanomaterial-microbe hybrid systems have combined the unique physicochemical properties of nanomaterials with the biocatalytic capabilities of microorganisms. These hybrid systems have seen extensive use in energy production, particularly in enhancing hydrogen generation. Researchers have incorporated nanomaterials into microbial cultures, achieving significant improvements in the hydrogen production efficiency of microbes across various environments and bacterial strains. However, challenges such as the biological toxicity of nanomaterials pose obstacles to their broader application in microbial energy production. This review examines the effects of nanomaterials on microorganisms, focusing on both their positive and negative effects on microbial growth and metabolism. It also summarizes the applications of nanomaterials in microbial fermentation for hydrogen production. Additionally, it highlights the importance of understanding and balancing these effects when introducing nanomaterials, offering guidance for developing more efficient nanomaterial-microbial hybrid hydrogen production systems.

Dynamic QSAR modeling for predicting in vivo genotoxicity and inflammation induced by nanoparticles and advanced materials: a time-dose-property/response approach

Predicting the health risks of nanoparticles (NPs) and advanced materials (AdMa) is a critical challenge. Due to the complexity and time-consuming nature of experimental testing, there is a reliance on in silico methods such as quantitative structure-activity relationship (QSAR), which, while effective, often fail to capture the dynamic nature of material activity over time-essential for reliable risk assessment. This study develops dynamic QSAR models using machine learning to predict toxicological responses, such as inflammation and genotoxicity, following pulmonary exposure to 39 AdMa across various post-exposure time points and dose levels. By incorporating exposure time, administered dose, and material properties as independent variables, we successfully developed time-dose-property/response models capable of predicting AdMa-induced in vivo genotoxicity in bronchoalveolar lavage fluid cells, lung and liver tissue, and inflammation in terms of neutrophil influx into the lungs of mice. Key factors driving AdMa-induced toxicity were identified, including exposure dose, post-exposure duration time, aspect ratio, surface area, reactive oxygen species generation, and metal ion release. The time-dose-property/response modeling paradigm presented here provides a practical and robust approach for predicting in vivo genotoxicity and inflammation and supports the comprehensive risk assessment of morphologically diverse AdMa.

The Intersection of Stem Cells and Nanomaterials: Implications for Tissue Engineering and Regenerative Medicine

An emerging field with great implications for therapeutics and regenerative medicine is nanomaterial in stem cell biology. The aim of this review is to explore the potential of nanomaterials in stem cell research, covering targeted delivery, differentiation and tracking. We will also present safety aspects related to the use of nanomaterials, highlighting the need to perform full toxicity, biocompatibility, and long-term assessment of their implications for tissues and stem cells in the vicinity of the scaffold.

Concurrent induction of pyroptosis and immunogenic cell death by capsaicin/graphene nanocomplex for enhanced breast cancer immunotherapy

Inducing immunogenic cell death (ICD) has emerged as a promising strategy for targeting immunologically "cold" tumors. However, most current therapies focus on a single mechanism, limiting their efficacy. In this study, we propose a nano-enabled approach that synergistically activates two complementary immunogenic killing mechanisms: pyroptosis, which elicits a potent inflammatory response, and ICD, characterized by the presentation of 'eat-me' signals and tumor antigens to the immune system. Capsaicin, a naturally occurring compound, was employed to induce pyroptosis via ROS-mediated gasdermin E (GSDME) cleavage, resulting in cell membrane blebbing and subsequent cell death. To simultaneously trigger ICD, we incorporated 2D graphene oxide (GO) engineered with optimized physicochemical properties to induce robust ICD under near-infrared irradiation. Our in vitro and in vivo experiments demonstrated that the combined treatment of capsaicin and GO not only enhanced cancer cell killing but also promoted immune cell infiltration and potentiated anti-tumor immunity, leading to significant tumor suppression. Moreover, the dual-trigger mechanism of pyroptosis and ICD yielded superior anti-tumor efficacy compared to single-modality treatments while maintaining a favorable biosafety profile. These findings highlight the potential of a synergistic nano-enabled strategy for improving cancer immunotherapy.

Biomolecular interactions of carbon nanotubes with amyloid-β proteins

Carbon nanotubes (CNTs) have attracted considerable attention due to their prominent advantages of adsorption, tensile strength, electronic conductivity, and surface functionalization using proteins or functional groups. Recent studies suggested that carbon quantum dots, graphene, and hybrid materials doped with CNTs can effectively inhibit the fibrillization of amyloid-β proteins (Aβ), which represents a significant signal of early Alzheimer's disease (AD). The investigations on the CNT-Aβ interaction can elucidate the reaction mechanism and reveal the basic reaction phenomena of CNTs in AD patients. This review systematically introduces the basic characteristics and biosafety of CNTs, the physicochemical properties of Aβ, and the CNT-Aβ interaction mechanism. We mainly summarize the mechanisms of different functional group modifications on the surface of CNTs for Aβ interactions, and even the interactions between different-diameter CNTs and Aβ. In addition, we also introduce the "protein crown" formed on the CNT surface, leading to the various CNT-Aβ interactions. Our work provides a theoretical basis for the biomedical application of CNTs and its applications in AD therapy/treatment.

A Systematic Review of Toxicity, Biodistribution, and Biosafety in Upconversion Nanomaterials: Critical Insights into Toxicity Mitigation Strategies and Future Directions for Safe Applications

Upconversion nanoparticles (UCNPs) are emerging as highly promising nanomaterials due to their exceptional optical properties, enabling diverse applications in biosensing, bioimaging, photodynamic therapy, and drug delivery. However, their potential toxicity should be comprehensively investigated for the safe utilization of UCNPs in several biomedical and environmental applications. This review systematically evaluates the current knowledge on UCNP toxicity from 2008 to 2024, focusing on key toxicological pathways, such as oxidative stress, reactive oxygen species (ROS) production, inflammatory responses, and apoptosis/necrosis, alongside their absorption, distribution, metabolism, and excretion processes and kinetics. Distinctively, this review introduces a bibliometric analysis of UCNP toxicity and biodistribution research, providing a quantitative assessment of publication trends, influential authors, leading institutions, funding agencies, and keyword occurrences. This approach offers a macroscopic perspective on the evolution and current landscape of UCNP safety research, a dimension largely unexplored in existing literature. Furthermore, the review combines mechanistic insights into UCNP toxicity with a critical evaluation of surface modifications, physicochemical properties, and administration routes, presenting a holistic framework for understanding UCNP biosafety. By combining bibliometric data with mechanistic insights, this review provides a data-driven perspective on UCNP-associated risks, actionable strategies for enhancing biosafety through surface engineering, and a forward-looking discussion on regulatory challenges and future directions for UCNP-based technologies. These findings bridge existing gaps in the literature and offer a comprehensive resource for researchers, clinicians, and policymakers, facilitating the safe development and utilization of UCNP-based technologies while establishing robust safety guidelines to mitigate adverse effects on human health and the environment.

Comparative analysis of bioaccumulation and biological impacts of cadmium sulfide (CdS) bulk versus nanoparticles in the freshwater snail Helisoma duryi

Cadmium sulfide (CdS) nanomaterials are used in photothermal therapy, drug delivery, photocatalysis, and device lasers. Due to the rise of nanotechnology, assessments of their impact on human health and ecosystems are essential. Cadmium-based nanoparticles are notable for their physicochemical properties and use in hazardous substances like pesticides. While cadmium toxicity in fish species is well-researched, little is known about how CdS nanoparticles affect other aquatic life. This study investigates the toxicological effects of CdS in bulk and nanoparticle forms on the freshwater snail Helisoma duryi, using starch as a stabilizer and various characterization techniques. Snails were exposed to different CdS concentrations to determine LC50 values, followed by a four-week sublethal exposure and a two-week recovery phase to assess biochemical, oxidative stress, and bioaccumulation responses. Results showed that CdS-NP exhibited lower toxicity than bulk CdS. CdS-NP induced significantly higher oxidative stress) Nitric oxide, Malonaldehyde), marked by reduced antioxidant markers like catalase and total antioxidant capacity (TAC). In contrast, bulk CdS caused more pronounced biochemical disruptions, increasing hepatic enzyme activities (alkaline phosphatase (ALP), alanine aminotransferase (ALT), and aspartate aminotransferase (AST)). Bioaccumulation studies indicated greater CdS retention in soft tissues, but CdS-NP showed faster clearance during recovery. This study demonstrates the extent of CdS nanoparticles' toxicity to the environment and human and animal health. These findings highlight distinct toxicological risks: CdS-NP intensifies oxidative stress, while bulk CdS leads to severe biochemical disruptions. This study demonstrates that cadmium sulfide in nanoparticles and bulk forms exerts differential toxic effects, necessitating targeted environmental monitoring and regulation.

Identification of nanoparticle infiltration in human breast milk: Chemical profiles and trajectory pathways

Breast milk is crucial for infant health, offering essential nutrients and immune protection. However, despite increasing exposure risks from nanoparticles (NPs), their potential infiltration into human breast milk remains poorly understood. This study provides a comprehensive chemical profile of NPs in human breast milk, analyzing their elemental composition, surface charge, hydrodynamic size, and crystallinity. NPs were detected in 42 out of 53 milk samples, with concentrations reaching up to 1.12 × 1011 particles/mL. These particles comprised nine elements, with O, Si, Fe, Cu, and Al being the most frequently detected across all samples. We establish a mechanistic axis for NP infiltration, involving penetration of the intestine/air-blood barriers, circulation in blood vessels, crossing the blood-milk barrier via transcytosis or immune cell-mediated transfer, and eventual accumulation in milk. Structure-activity relationship analysis reveals that smaller, neutral-charged NPs exhibit stronger infiltration capacity, offering potential for regulating NP behavior at biological barriers through engineering design. This study provides the chemical profiles of NPs in human breast milk and uncovers their infiltration pathways.

Mitigating microplastic-induced organ Damage: Mechanistic insights from the microplastic-macrophage axes

We live in a world increasingly dominated by plastic, leading to the generation of microplastic particles that pose significant global health concerns. Microplastics can enter the body via ingestion, inhalation, and direct contact, accumulating in various tissues and potentially causing harm. Despite this, the specific cellular mechanisms and signaling pathways involved remain poorly understood. Macrophages are essential in absorbing, distributing, and eliminating microplastics, playing a key role in the body's defense mechanisms. Recent evidence highlights oxidative stress signaling as a key pathway in microplastic-induced macrophage dysfunction. The accumulation of microplastics generates reactive oxygen species (ROS), disrupting normal macrophage functions and exacerbating inflammation and organ damage. This review serves as the first comprehensive examination of the interplay between microplastics, macrophages, and oxidative stress. It discusses how oxidative stress mediates macrophage responses to microplastics and explores the interactions with gut microbiota. Additionally, it reviews the organ damage resulting from alterations in macrophage function mediated by microplastics and offers a novel perspective on the defense, assessment, and treatment of microplastic-induced harm from the viewpoint of macrophages.

Machine learning-driven nanoparticle toxicity

This study presents a comprehensive machine learning-driven analysis to understand and predict the toxicity of nanoparticles (NPs), a crucial aspect in ensuring the safe application of nanotechnology in medicine, pharmaceuticals, biotechnology, and various other industries. By using a robust dataset, we deployed Random Forest (RF) and Light Gradient Boosting Machine (LightGBM) algorithms to identify key NP features that significantly influence cellular toxicity. The integration of Shapley Additive exPlanations (SHAP) values provided an interpretative insight into the predictive models, allowing for a quantitative assessment of feature impact. Our findings highlighted the inverse relationship between NP concentration and cell viability and the heightened toxicity of smaller NPs due to their larger surface-to-volume ratios. Notably, the LightGBM model's sensitivity to zeta potential elucidates the nuanced impact of surface charge on cytotoxic effects. The results from this investigation can guide the synthesis of safer NPs, emphasized the need to consider these critical features to mitigate toxicity while maintaining functional integrity. The study underlines the complexity of NP toxicity modeling and the necessity for advanced analytical methods to capture the multifaceted nature of nanomaterial interactions with biological systems. This work lays the groundwork for future research aimed at refining NP design for safer biomedical applications and consumer products, marking a significant step towards responsible nanotechnology development.

Physicochemical and Toxicological Properties of Particles Emitted from Scalmalloy During the LPBF Process

This study investigates the physicochemical and toxicological properties of Scalmalloy powder emissions generated during Laser Powder Bed Fusion (LPBF), focusing on the impact of particle morphology, oxidation, and size distribution on biological responses. Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analyses revealed significant variations in particle characteristics, with the highest oxidation levels and irregular morphologies observed in exhaust-derived powders. In vitro cytotoxicity evaluations using A549 lung epithelial cells showed significant reductions in cell viability (~60 to 69%) and increased oxidative stress (p < 0.05) upon exposure to virgin sieved (<20 µm) and exhaust powder samples. Conversely, samples from the build plate, overflow, and dispenser exhibited high cell viability (>85%). Indirect exposure through media incubation resulted in minimal cytotoxicity, suggesting that metal dissolution plays a limited role in toxicity under the studied conditions. The findings highlight the influence of particle morphology and oxidation on cytotoxic responses and underscore the need for controlled powder handling to mitigate occupational exposure risks in LPBF environments.

Impacts of environmentally persistent free radicals on the denitrification toxicity of photoaged tire wear particles in estuarine sediments

The widespread detection of tire wear particles (TWPs) in estuaries has raised concerns about their potential environmental hazards. However, knowledge of photoaging-induced environmentally persistent free radicals (EPFRs) formation on TWPs in estuarine environments and their impact on sediment denitrification remains limited. This study investigated the formation of EPFRs on TWP during photoaging in estuarine environments and evaluated their effects on sediment denitrification and nitrous oxide (N2O) accumulation. Sixty days of illumination increased EPFR concentration on TWPs by 373 %, with the generated EPFRs persisting in sediments for over 20 days. Exposure to pristine TWP (PTWP) reduced denitrification rates by 10.3 ± 5.6 % and increased N2O accumulation by 18.3 ± 4.5 %. Further exposure to photoaged TWP (ATWP) under 10-60 days of illumination expanded denitrification suppression and N2O accumulation to 28.1 ± 7.1-42.5 ± 6.6 % and 18.8 ± 4.3-31.7 ± 4.6 %, respectively. EPFRs exacerbated the accumulation of reactive nitrogen species in sediment and compromised the antioxidant systems. Structural equation modeling confirmed that EPFRs indirectly suppressed denitrification rates by directly impairing microbial processes involved in carbon metabolism and electron transfer. This study is the first to report that the formation of EPFRs enhances the negative effects of ATWP on the sediment's nitrogen cycle, offering valuable insights for assessing the ecological risks associated with TWP.

Gestational Exposure to Black Phosphorus Nanoparticles Induces Placental Trophoblast Dysfunction by Triggering Reactive Oxygen Species-Regulated Mitophagy

As a type of two-dimensional nanomaterial, black phosphorus (BP) has attracted considerable interest for applications in various fields. Despite its advantages, including biodegradability and biocompatibility, recent studies have shown that BP exhibits cytotoxicity in different types of cells. However, no studies have investigated the effects of BP exposure during pregnancy. Herein, we first investigated the effect of gestational exposure to BP nanoparticles (BPNPs) in a mouse model. Our findings indicated that BPNPs exposure restricted fetal growth and hindered placental development. In HTR8/SVneo trophoblast cells, BPNPs inhibited cell proliferation, migration, and invasion and caused apoptosis in a dose-dependent manner. Furthermore, BPNPs induced intracellular reactive oxygen species (ROS) overproduction and extensive mitochondrial damage. We further demonstrated that BPNPs promoted mitophagy via the PINK1/Parkin signaling pathway. Parkin siRNA knockdown rescued BPNPs-induced trophoblast dysfunction, while ROS inhibition attenuated BPNPs-induced cytotoxicity by reducing mitochondrial damage. Finally, treatment with mdivi-1, a mitophagy inhibitor, mitigated mitochondrial membrane potential reduction, excessive mtROS production, and the resulting trophoblast dysfunction. In vivo model investigation indicated that the application of mdivi-1 ameliorated embryonic resorption and fetal growth by alleviating placental damage. In summary, gestational exposure to BPNPs impairs fetal growth by inducing placental trophoblast dysfunction through ROS-regulated, PINK1/Parkin-dependent mitophagy.

Bioelectric and physicochemical foundations of bioelectronics in tissue regeneration

Understanding and exploiting bioelectric signaling pathways and physicochemical properties of materials that interface with living tissues is central to advancing tissue regeneration. In particular, the emerging field of bioelectronics leverages these principles to develop personalized, minimally invasive therapeutic strategies tailored to the dynamic demands of individual patients. By integrating sensing and actuation modules into flexible, biocompatible devices, clinicians can continuously monitor and modulate local electrical microenvironments, thereby guiding regenerative processes without extensive surgical interventions. This review provides a critical examination of how fundamental bioelectric cues and physicochemical considerations drive the design and engineering of next-generation bioelectronic platforms. These platforms not only promote the formation and maturation of new tissues across neural, cardiac, musculoskeletal, skin, and gastrointestinal systems but also precisely align therapies with the unique structural, functional, and electrophysiological characteristics of each tissue type. Collectively, these insights and innovations represent a convergence of biology, electronics, and materials science that holds tremendous promise for enhancing the efficacy, specificity, and long-term stability of regenerative treatments, ushering in a new era of advanced tissue engineering and patient-centered regenerative medicine.

Predicting biomolecule adsorption on nanomaterials: a hybrid framework of molecular simulations and machine learning

The adsorption of biomolecules on the surface of nanomaterials (NMs) is a critical determinant of their behavior, toxicity, and efficacy in biological systems. Experimental testing of these phenomena is often costly or complicated. Computational approaches, particularly the integrating methods of various theoretical levels, can provide essential insights into nano-bio interactions and bio-corona formation, facilitating the efficient design of nanomaterials for biomedical applications. This study presents a hybrid, meta-modeling approach that integrates physics-based molecular modeling with machine learning algorithms to predict the interaction energy between NMs and biomolecules extracted from the potential of mean force (PMF). Novel descriptors for the surface properties of NMs are developed and combined with structural descriptors of biomolecules to derive quantitative structure-property relationships (QSPRs). The developed QSPR model (training set: R2 = 0.84, RMSE = 1.52, Rcv2 = 0.83, and RMSEcv = 1.34; validation set: R2 = 0.70, RMSE = 1.94, and Rcv2 = 0.72, RMSEcv = 1.88) helps in understanding and predicting the interactions between NMs (including carbon-based materials, metals, metal oxides, metalloids, and cadmium selenide) and biomolecules (including amino acids and amino acid derivatives). The model facilitates safe and sustainable design of nanomaterials for various applications, particularly for nanomedicine, by providing insight into nano-bio interactions, identification of toxicity risk and optimizing functionalization for safety according to the risk mitigation policy of regulatory authorities. Additionally, a dedicated application has been developed and is available on GitHub, enabling researchers to analyze the surface properties of nanomaterials belonging to the above-mentioned groups of NMs.

The develop of persistent luminescence nanoparticles with excellent performances in cancer targeted bioimaging and killing: a review

The use of fluorescent nanomaterials in tumor imaging and treatment effectively avoids the original limitations of traditional tumor clinical diagnostic methods. The PLNPs emitted persistent luminescence after the end of excitation light. Owing to their superior optical properties, such as a reduced laser irradiation dose, spontaneous fluorescence interference elimination, and near-infrared imaging, PLNPs show great promise in tumor imaging. Moreover, they also achieve excellent anti-tumor therapeutic effects through surface modification and drug delivery. However, their relatively large size and limited surface modification capacity limit their ability to kill tumors effectively enough for clinical applications. Thus, this article reviews the synthesis and modification of PLNPs and the research progress in targeted tumor imaging and tumor killing. We also discuss the challenges and prospects of their future applications in these fields. This review has value for accelerating the design of PLNPs based platform for cancer diagnosis and treatment.

Alumina nanoparticles induce learning and memory impairment in a particle size-dependent and time-dependent manner

The study investigates the influence of alumina nanoparticles (Al2O3 NPs) at varying sizes on the learning and memory of adult ICR mice over different exposure durations. The mice were administered saline or Al2O3 nanoparticles of 10μm, 50 nm, and 13 nm via nasal drip. Following administration, the Morris water maze test was conducted, along with assessments of inflammation, oxidative stress, hippocampal histopathology, and cell death-related proteins. Initially, after acute exposure, a trend emerged where learning and memory gradually declined as nanoparticle size decreased, with the most significant impact observed in the 13 nm Al2O3 group. Upon chronic exposure, there was a significant decline in learning and memory within the Al2O3 NPs groups compared to other groups, accompanied by neuronal loss, swelling, light staining, and disorganization. Concurrently, levels of TNF-α and IL-1β within 7 days, MDA after 7 days, and death-related proteins such as Cathepsin-B, c-caspase3, LC3-II, Beclin1, RIP, and Cathepsin-L showed a linear increase, while SOD and GSH-PX activity steadily decreased. Over time, learning capability decreased, correlating with a sharp reduction in TNF-α and SOD activity, a gradual increase in MDA, c-caspase3, and Beclin1 levels in the Al2O3 NPs group, as well as elevated Cathepsin-L, LC3-II, and RIP levels in the 13 nm Al2O3 group. Consequently, Al2O3 NPs significantly impaired learning and memory in a particle size-dependent manner through initial inflammation and oxidative stress after acute exposure, and time-dependent impairment via escalating oxidative stress and neuronal death.

Efficiency and safety of nanopesticides, it takes two to tango. An overview of the lack of data on possible effects on human health

The use of pesticides has increased dramatically in recent decades, causing concern, particularly regarding human exposure and health effects. New strategies have been developed to limit the use of such hazardous substances. These include the development of "nanopesticides", which consist of either nanomaterials used directly as the active ingredient or nanomaterials used as carriers to encapsulate the active ingredient. These nanoformulated pesticide offer many advantages and could be more efficient and safer than their conventional counterparts. However, little is known about their potential impact on human health. The aim of this review is to provide an overview of the current studies investigating the adverse effects of nanopesticides, particularly nanoencapsulated pesticides, on human health. A literature search was conducted in the PubMed and Web of Science databases using the following keywords: (nano*) AND (pesticid* OR phytosanitar* OR herbicid* OR insecticid* OR fungicid* OR weedicid*) AND (toxi* OR inflam* OR oxidative stress) AND (human OR mammalian). Articles were excluded if: i) they were reviews, ii) no toxicity data were reported, iii) studies were conducted in non-mammalian models, iv) the nanomaterials were not developed for pesticide delivery, and v) the articles were not written in English. Of 2102 papers, only 27 were included, highlighting the lack of data on the potential effects of nanopesticides in mammalian models. In conclusion, although nanopesticides appear to be promising tools to limit the hazard of conventional pesticides, extensive studies are still necessary to ensure their safety, especially for human health, before their widespread application.

Uptake, localization and dissolution of barium sulfate nanoparticles in human lung cells explored by the combination of ICP-MS, TEM and NanoSIMS

BACKGROUND

Barium sulfate nanoparticles (BaSO4-NPs) are considered to be poorly soluble, chemically inert, and therefore relatively non-toxic. For humans, inhalative exposure represents the most significant route of uptake.

OBJECTIVE AND METHODS

Cellular effects after exposure to BaSO4-NPs for 24 and 72 have been investigated in this study on primary human lung cells. To track the fate of BaSO4-NPs in human lung cells, we used inductively coupled plasma mass spectrometry (ICP-MS) to quantify cellular uptake of NPs, as well as transmission electron microscopy (TEM) and nanoscale secondary ion mass spectrometry (NanoSIMS) to investigate subcellular distribution of NPs through high-resolution elemental imaging.

RESULTS AND CONCLUSIONS

We show that BaSO4 nanoparticles have been taken up by normal human bronchial epithelial cells (NHBEC) in a dose-dependent manner. However, no clear time-dependent uptake could be observed. The barium sulfate nanoparticles were visible in vesicles within the cytosol by TEM, which was confirmed by high-resolution NanoSIMS images. Nevertheless, no uptake of the particles into the nucleus was observed in this study. However, it was shown that BaSO4-NPs were partly dissolved, and barium ions were distributed throughout the entire cell. Toxicity of the particles was indicated by a dose- and time-dependent loss of viability in human lung cells.

Catalyst-Free Synthesis of a Mechanically Tailorable, Nitric-Oxide-Releasing Organohydrogel and Its Derived Underwater Superoleophobic Coatings

Organohydrogels are an emerging class of soft materials that mimick the mechanical durability and organic solvent affinity of organogels and the biocompatibility and water swelling ability characteristics of hydrogels for prospective biomedical applications. This work introduces a facile, catalyst-free one-step chemical approach to develop an organohydrogel with impeccable antibiofouling properties following the epoxy-amine ring-opening reaction under ambient conditions. The mechanical properties of the as-fabricated organohydrogel can be tailored depending on the concentration of the epoxy-based cross-linker, from 0.10 to 1.12 MPa (compressive modulus). The affinity of the as-developed organohydrogel to both organic solvents and water was exploited to incorporate the antimicrobial nitric oxide donor (NO) molecule, S-nitroso-N-acetylpenicillamine (SNAP) from ethanol, and subsequently, the water-sensitive NO-releasing behavior of the organohydrogels was analyzed. The SNAP-incorporated organohydrogels release physiologically active levels of NO with 3.13 ± 0.27 × 10-10 and 0.36 ± 0.14 × 10-10 mol cm-2 min-1 flux of NO release observed at 0 and 24 h, respectively. The as-reported organohydrogel demonstrated excellent antibacterial activity against Escherichia coli and Staphylococcus aureus with >99% and >87% reduction, respectively, without eliciting any cytotoxicity concerns. Moreover, the organohydrogel with remarkable water uptake capacity was extended as a coating on different medically relevant polymers to demonstrate transparent underwater superoleophobicity. Thus, the facile synthesis of the reported organohydrogel and its derived underwater antifouling coating can open avenues for utility in biomedical, energy, and environmental applications.

In Vitro Cytotoxicity Evaluation of Nanosized Hydroxyapatite and Fluorapatite on Cell Lines and Their Relevance to the Alveolar Augmentation Process

Background/Objectives: Materials with an apatite structure were investigated in vitro in dental bone augmentation procedures. This scientific study aimed to compare nanosized hydroxyapatite (nHAp) and fluorapatite (nFAp) materials in the form of tablets in in vitro studies, including cytotoxicity assessment and fluoride release. Methods: The nHAp and nFAp nanosized materials were obtained using the microwave hydrothermal method. Subsequently, the tablets were prepared from these nanosized powders as further studied materials. Cytotoxicity tests were conducted on Balb/3T3 fibroblast cells and L929 cells. Fluoride ion release was tested at 3, 24, 48, 72, and 168 h periods. Results: Both materials presented viability levels above 70%, indicating a lack of cytotoxic potential. The amount of fluoride (F-) ions released and accumulated from nFAp was greatly higher than from nHAp. The release of F- ions in both samples was the highest in the first 3 h of exposition. The accumulation of F- ions reached the highest values in the deionized water. The most significant differences in the released or cumulated fluoride ions were observed between deionized water and lower 4.5 pH AS (artificial saliva) samples. Conclusions: Both nanosized hydroxyapatite and fluorapatite materials are biocompatible, and their in vitro examination showed promising results for their future in vivo application.

Nanoparticle-mediated enhancement of DNA Vaccines: Revolutionizing immunization strategies

DNA vaccines are a novel form of vaccination that aims to harness genetic material to produce targeted immune responses. Nevertheless, their therapeutic application is hampered by low transfection efficacy, immunogenicity, and instability. Nanoparticle (NP) - based delivery systems are beneficial in enhancing DNA stability, increasing DNA uptake by antigen-presenting cells (APCs), and controlling antigen release. Some key progress includes the polymeric, lipid-based, and hybrid NPs and biocompatible carriers with inherent adjuvant effects. These systems have helped to enhance the antigen cross-presentation and T-cell activation significantly. In addition, biocompatible hybrid nanocarriers, antigen cross-presentation strategies, and next-generation sequencing (NGS) technologies are speeding up the identification of new antigens, while AI and machine learning are facilitating the development of efficient delivery systems. This review aims to assess how NPs have contributed to improving the effectiveness of DNA vaccines for treating diseases, cancer, and emerging diseases, as well as advancing the next generation of DNA vaccines.

Exopolysaccharide-selenium composite nanoparticle: Characterization, antioxidant properties and selenium release kinetics in simulated gastrointestinal conditions

An exopolysaccharide-selenium nanoparticles (EPS-SeNPs) was successfully synthesized by conjugating with Weissella confusa EPS through the reduction of SeO32-. The EPS-SeNPs composite was comprehensively characterized. These analyses confirmed that the EPS-SeNPs composite had an amorphous nature and a uniform size distribution of around 100 nm. The OH groups in EPS interacted with SeNPs, replacing intermolecular interactions in native EPS, which resulted in the stable dispersion of SeNPs within the EPS network. Furthermore, compared to native EPS, EPS-SeNPs with varying Se/EPS ratios demonstrated enhanced radical scavenging capabilities against ABTS, DPPH, superoxide anion radical (O2-), H2O2, and hydroxyl group radicals (OH·). This suggests that the conjugation of SeNP improved the antioxidant properties of EPS. Furthermore, the investigation delved into the dynamics and mechanism of selenium liberation from EPS-SeNPs under simulated gastric (SGF) and intestinal fluids (SIF). The EPS-SeNPs experienced a decrease in particle size from 223.03 ± 1.67 nm to 98.40 ± 5.57 nm. The release kinetics of selenium in SIF followed a conventional Fickian diffusion pattern. Notably, EPS-SeNPs demonstrated significant Se release following SIF digestion while exhibiting minimal release after SGF digestion, indicating their potential use as a controlled-release selenium-enriched supplement for addressing selenium deficiency.

Emerging nanocarriers as advanced delivery tools for the treatment of leukemia

The most common type of blood cancer, leukemia, presents global therapeutic challenges like heterogeneity regarding age, sex, race, and a multiple pool of oncogenes and their complex network. In the last few years, nanotechnology has become the potential solution in leukemic resistance, chemotherapeutic failure, and disease-remission risk. Interestingly, the nanocarriers alone sometimes cannot overcome leukemia's obstacles, which demands a more advanced flagship in the nanocarrier segment like modification of the nanocarrier system, external stimuli for synergistic antileukemic effect, etc. This review has highlighted the need for emerging nanocarriers like exosome-like vesicles, nanodiamonds, nanoflower, etc. and biomimetic nanocarriers that reach the bone marrow niche. Notably, the role of nanoparticle-based vaccines in a disease-remission-free life and novel technology for nanocarrier delivery (microfluidics and plasmonic nanobubbles) have been discussed. This review also focuses on the clinical transition barriers of nanocarriers from the research laboratory. The continual research on novel nanocarriers and integration of new technologies to deliver the nanocarriers in the right way is paving the path for enhanced selectivity and efficacy in leukemia. The promising results in precise drug delivery and leukemic cell destruction are showing its great clinical prospects.

Phytomediated Chitosan-Modified TiO2 NPs for Enhanced Photocatalytic and Potential Application for Breast Cancer Therapy

This work investigates the structural, photocatalytic, and biological properties of Juglans regia leaves extract mediated chitosan-modified TiO2 nanoparticles (NPs) and Juglans regia mediated TiO2 NPs. The structural and morphological analysis conducted using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and FTIR revealed that synthesizing the TiO2 NPs using both chitosan and Juglans regia leaves extract results in lower particle size and less agglomeration in comparison to TiO2 NPs synthesized using only Juglans regia leaves extract. The photocatalytic activity for the degradation of Rhodamine B using phytomediated chitosan-modified TiO2 NPs has a remarkable degradation efficacy of 95.07% when subjected to UV-visible light. Further, phytomediated chitosan-modified TiO2 NPs have ability to reduce the E2 estrogen levels and which inhibits the growth of breast cancer cells (MCF-7) which was confirmed by yeast based XenoScreen XL YES assay, [3H] thymidine incorporation, and apoptosis gene expression (Casp 3 and Casp 9) analysis.

The Impact of Carbon Nanotube Properties on Lung Pathologies and Atherosclerosis Through Acute Inflammation: a New AOP-Anchored in Silico NAM

In this study, a previously developed approach for creating a quantitative structure-activity relationship model anchored in an Adverse Outcome Pathway framework (AOP-anchored Nano-QSAR) is employed to develop a novel model capable of predicting transcriptomic responses triggered by the inhalation of multiwalled carbon nanotubes (MWCNTs). The acute phase response (AR) signaling pathway, which plays a crucial role in neutrophil influx and initiates the acute immune response is focused. This process involves recruiting pro-inflammatory cells into the lungs and can lead to lung fibrosis, as outlined in AOP33, or atherosclerosis, as per AOP237. To establish the relationship between the structural properties of a set of MWCNTs and the transcriptional benchmark dose level (BMDLAR) response of genes associated with the acute phase response signaling pathway, the locally weighted kernel linear regression algorithm is used. These findings emphasize the critical role of the aspect ratio and specific surface area of MWCNTs in initiating acute inflammation and, subsequently, lung pathologies and atherosclerosis through the inflammatory and acute phase response signaling pathways. This newly developed data-driven model extends the repertoire of transcriptomic-based, AOP-informed Nano-QSAR models, potentially serving as an in silico new approach methodology (NAM) to support the MWCNTs' safety assessment based on the weight of evidence.

Toxicity and bioaccumulation of nanoparticles of zinc oxide (ZnO) and titanium dioxide (TiO2) in Chydorus sphaericus and Cypridopsis cf. vidua (Crustacea)

Nanoparticles of titanium dioxide (TiO2) and zinc oxide (ZnO), have great demand and commercial use. Their presence in water reservoirs constitute a potential to produce adverse effects on crustaceans. We used two species of crustaceans: the cladoceran Chydorus sphaericus, and the ostracod Cypridopsis cf. vidua. Cultures were kept in a bioclimatic chamber at 20°C and 25°C respectively. Model organisms were exposed to the nanoparticles of TiO2 and ZnO. We observed presence of nanoparticles in both organisms exposed to LC50 values using X-ray diffraction. The nanoparticles of ZnO are the most toxic for both species than those of TiO2. In cladocerans toxicity of TiO2 nanoparticles decreased in the following order: anatase > anatase-rutilium > rutilium. In all cases LC50 values of cladocerans are lower than those of ostracods. Titanium was detected in both external and internal structures. Titanium was more abundant in cladocerans than ostracods. However, zinc was not detected. We found differences in the elemental composition of cladocerans and ostracods after being exposed to both TiO2 and ZnO. In ostracods we found more calcium whereas in cladocerans we found more carbon. We discussed these findings in terms of biochemical composition of both biological species and the toxicity of the nanoparticles.

Can Boron and Cobalt Nanoparticles Be Beneficial Effectors to Prevent Flooding-Induced Damage in Durum and Bread Wheat at Germination and Tillering Stage?

In this study, we investigated the possible effects of cobalt and boron nanoparticles as an inducer of the first stages of development (germination) of hard and soft wheat when simulating flooding as one of the limiting environmental factors. We also investigated the remote effect of treating wheat grains with nanoparticles when flooding was applied already at the tillering stage. To identify the effects of nanoparticles, we used morphometric, biochemical and phenotypic parameters of seedlings and plants of two wheat species differing in origin and the response of these parameters to flooding. Positive effects were found at the germination stage, increasing quantitative indicators under stress. The sensitivity of wheat species to flooding was different, which corresponds to historical and climatic aspects of cultivation. Sensitivity to stress effects associated with loss of germination, decreased growth and photosynthesis was shown for both species. Treatment with cobalt and boron nanoparticles enhanced adaptation to stress and improved photosynthetic parameters, but the encouraging results under stressful conditions were ambiguous and in the case of soft wheat could lead to deterioration of some parameters. Thus, the use of boron and cobalt nanoparticles has potential for reducing productivity under stress, but requires a detailed assessment of the cultivation protocol depending on the genotype.

Investigation of Cell Damage Induced by Silver Nanoparticles in a Model Cell System

Background/Objectives: The growing diversity of novel nanoparticle synthesis methods, particularly for silver nanoparticles (AgNP), coupled with their significant biological activity and wide range of applications across various medical fields, necessitates a comprehensive investigation into the consequences of particle-induced cellular damage. This study aimed to investigate AgNP-induced damage to macrophage plasma membranes, focusing on concentration, temperature, incubation time, and the role of pro- and antioxidant factors, using model systems based on mouse peritoneal macrophages. Methods: Mouse peritoneal macrophages were incubated with AgNP (0.1-10 μg/mL) at temperatures ranging from 4 °C to 37 °C. Membrane integrity was assessed via microfluorimetric analysis. The influence of prooxidant (UV-B) and antioxidant (serotonin) factors was also examined. A mathematical model was developed to describe the interaction between AgNP and macrophages. Results: The diameter of our synthesized silver nanoparticles, assessed via dynamic light scattering (DLS), ranged from 5 to 170 nm, with a predominant size distribution peak at 70 nm. AgNP caused dose- and temperature-dependent membrane damage, which was more pronounced at 4 °C and 37 °C than at 22 °C and increased with incubation time. UV-B enhanced membrane damage, while serotonin mitigated it. The mathematical model correlated strongly with the experimental data, emphasizing the role of ROS in membrane disruption. AgNP also dose-dependently increased ROS generation by macrophages. Conclusions: AgNP, in doses of 0.1-10 μg/mL, induces dose-dependent membrane damage in macrophages. The developed model is a useful tool for predicting nanoparticle toxicity. Together with the experimental findings, it highlights the critical role of ROS, lipid peroxidation, the lipid bilayer state, and antioxidant defenses in AgNP-induced membrane damage.

Understanding gold nanoparticles and their attributes in ovarian cancer therapy

Ovarian cancer is one the deadliest disease wherein the survival rate is very low. Despite of advances in medical sciences, researches are still at the stage of infancy where patients are succumbing to this malignancy. Multidrug resistance, toxicity, mode of treatment related issues like catheter related complication poises a number of challenges to scientists worldwide. Novel therapy is now thus being focussed to sensitive the cells more towards the treatment. Gold nanoparticles (Au NPs), known for their high biocompatibility, and strong optical and magnetic responses, have emerged as promising agents for both the diagnosis and treatment of ovarian cancer. Owing to physical characteristics, AuNPs may be used as adjuvants in bioimaging, radiotherapy and fluorescence imaging. As a result, these characteristics substantially support AuNPs in biological domains. In addition to their therapeutic potential, Au NPs exhibit strong surface plasmon resonance (SPR) properties, enhancing imaging techniques for early detection of ovarian tumors. Furthermore, chemical properties such as Magnetic Resonance and Imaging Properties, X-ray imaging property, Two-photon or multiphoton imaging, and Optical coherence tomography (OCT) imaging properties enhance the use of Au NPs in diagnosis. This paper highlights the properties, targeting potential and diagnosis and treatment of ovarian cancer by Au NPs has been discussed.

Exploring processing-structure-property relationships of chemically precipitated strontium silicate particles for medical applications

Bone regeneration in the presence of osteoporosis presents a significant challenge in dental and orthopedic surgery. To tackle this issue, researchers have developed strontium-containing biomaterials. However, preventing bacterial infection is also crucial for successful surgical treatment. In this study, we delved deep into the processing to tailor the composition and structure of new strontium silicates with unique properties to address this challenge. We used chemical precipitation to prepare various strontium silicate particles using varying ammonia concentrations and Sr/Si precursor ratios. The L929 cytotoxicity, differentiation of human mesenchymal stem cells (hMSCs), biological function of RAW 264.7 macrophages, and antibacterial activity against E. coli and S. aureus were evaluated. As a result, higher ammonia concentration led to the formation of SrSiO3 and Sr2SiO4 particles with smaller sizes and higher Sr/Si ratios. These particles exhibited increased antibacterial efficacy and radiopacity, promoting cell viability and osteogenic activity of hMSCs and modulating M1/M2 macrophage polarization. In conclusion, the developed strontium silicate demonstrated superior antibacterial activity, exceptional osteogenic properties, and clear visibility during procedures, making it a promising material for bone regeneration and osteoporosis treatment.

Allergy Treatment: A Comprehensive Review of Nanoparticle-based Allergen Immunotherapy

Allergic disorders rising in prevalence globally, affecting a substantial proportion of individuals in industrialized nations. The imbalance in the immune system, characterized by elevated allergen-specific T helper 2 (Th2) cells and immunoglobulin E (IgE) antibodies, is a key factor in allergy development. Allergen-specific immunotherapy (AIT) is the only treatment capable of alleviating allergic symptoms, preventing new sensitizations, and reducing asthma risk in allergic rhinitis patients. Traditional AIT, however, faces challenges such as frequent administration, adverse effects, and inconsistent patient outcomes. Nanoparticle-based approaches have emerged as a promising strategy to enhance AIT. This review explores the utilization of nanoparticles in AIT, highlighting their ability to interact with the immune system and improve therapeutic outcomes. Various types of nanoparticles, including polyesters, polysaccharide polymers, liposomes, protamine-based nanoparticles (NPs), and polyanhydrides, have been employed as adjuvants or carriers to enhance AIT's efficacy and safety. Nanoparticles offer advantages such as allergen protection, improved immune response modulation, targeted cell delivery, and reduced side effects. This review provides an overview of the current landscape of nanoparticle-based allergen immunotherapy, discussing its potential to revolutionize allergy treatment compared to traditional immunotherapy.

Nanotechnology-Based Therapies for Preventing Post-Surgical Adhesions

Adhesions are the body's natural response to various inflammatory causes, with surgery being the most common cause. However, the formation of postoperative adhesions can lead to significant complications, including intestinal obstruction and chronic pain. To prevent such postoperative complications associated with adhesions, developing effective strategies for adhesion prevention has been a major focus of research. Currently, several therapeutic models have been developed to achieve this objective. These include pharmaceuticals, inert polymers, functional biomaterials, and nanotherapeutics. Among the various strategies developed, nanotherapeutics, though still in its early stages, has shown promise as a potential approach. Other therapeutic models are associated with adverse side effects and complications related to their application. On the other hand, nanotherapeutic models are able to overcome the limitations of the other strategies and provide their own set of unique advantages. Hence, nanotherapeutics represents a promising area for further research. Further efforts should be made to refine existing nanotherapeutics for clinical application while also addressing associated safety and ethical concerns related to their use in medical practice. Therefore, this article aims to review the various nanotherapeutic approaches developed for the prevention of postoperative adhesions, explore their regulatory pathways, and discuss associated safety and ethical concerns.

Effects of particle size, seasonal variation, and acid aging on the oxidative potential of urban and industrial airborne PM in Isfahan metropolis, Iran

Air pollution from particulate matter (PM) presents significant global environmental and public health challenges. PM's oxidative potential (OP) is a critical indicator integrating biological and physicochemical characteristics. This study investigates the OP of PM across different size fractions (PM2.5, PM10, and total suspended particles (TSP)) in urban and industrial areas of Isfahan, Iran, focusing on the effects of acid aging and seasonal variation. The oxidative potential of 92 PM samples, comprising 54 urban and 38 industrial samples, was evaluated using the dithiothreitol assay (OPDTT). The OPDTT values (mean ± sd) for PM2.5, PM10, and TSP of urban areas were 2.4 ± 0.8, 1.8 ± 0.6, and 1.1 ± 0.2, respectively. Corresponding values for industrial areas were 2.6 ± 0.8, 1.8 ± 0.4, and 1.0 ± 0.4 nmol min-1 m-3, respectively. Following exposure to nitric acid and sulfuric acid, the OPDTT values of urban PM increased by 62% and 41%, while industrial PM showed increases of 108% and 80%, respectively. Seasonal analysis revealed higher OPDTT values during warm months compared to cold months. Fine particles (PM2.5) exhibited greater OPDTT than coarse particles, particularly after acid aging. Furthermore, PM2.5 from industrial areas displayed higher toxicity than urban areas, likely attributable to particle concentration and chemical composition differences. This study highlights the importance of PM characteristics and sources in particle toxicity enhanced by acid aging. These findings underscore the importance of addressing the chemical composition and environmental factors contributing to PM toxicity, especially during warm months.

Nickel-based nanomaterials: a comprehensive analysis of risk assessment, toxicity mechanisms, and future strategies for health risk prevention

Nickel-based nanomaterials (NBNs) have seen a surge in usage across a variety of applications. However, the widespread use of NBNs has led to increased human exposure, raising questions about their associated health risks, both in the short and long term. Additionally, the spread of NBNs in the environment has attracted considerable attention, emerging as a vital focus for research and development. This review aims to provide an in-depth assessment of the current understanding of NBNs toxicity, the mechanisms underlying their toxicological effects, and the strategies for mitigating associated health risks. We begin by examining the physicochemical properties of NBNs, such as particle size, composition and surface functionalization, which are key determinants of their biological interactions and toxicity. Then, through an extensive analysis of in vitro and in vivo studies, we highlight the adverse effects of NBNs exposure, including the generation of reactive oxygen species (ROS), oxidative stress, inflammation, cytotoxicity, genotoxicity, and immunotoxicity. To address the potential health risks associated with NBNs, we propose future strategies for risk prevention, including the development of safer nanomaterial designs, implementation of stringent regulatory guidelines, and advancement of novel toxicity testing approaches.

Characterizing applications, exposure risks, and hazard communication for engineered nanomaterials in construction

BACKGROUND

Engineered nanomaterials (ENMs) may pose health risks to workers. Objectives were to characterize ENM applications in construction, identify exposure scenarios, and evaluate the quality of safety data sheets (SDSs) for nano-enabled construction products.

METHODS

SDSs and product data were obtained from a public database of nano-enabled construction products. Descriptive statistics were calculated for affected trades, product categories, and types of ENMs. A sample of SDSs (n = 33) was evaluated using modified criteria developed by NIOSH researchers. Bulk analysis via transmission electron microscopy characterized nanoparticles in a subset of products.

RESULTS

Companies report using >50 ENMs in construction products. ENM composition could not be determined via SDSs for 38.1% of the 907 products examined. Polymers and metal oxides tied for most frequently reported ENMs (n = 87, 9.6%). Nano silica, graphene, carbon nanotubes, and silver nanoparticles were also frequently reported. Most of the products were paints and coatings (n = 483, 53.3%), followed by pre-market additives, cementitious materials, insulation, and lubricants. Workers in twenty construction trades are likely to handle nano-enabled products, these particularly encompass cement and brick masons, painters, laborers, carpenters, glaziers, and insulators. A wide range of exposure scenarios were identified. SDSs were classified as satisfactory (18%), in need of improvement (12%), or in need of significant improvement (70%). Bulk analyses revealed discrepancies between actual ENM composition and those in SDSs.

DISCUSSION AND CONCLUSION

There has been significant progress investigating risks to construction workers posed by ENMs, but SDSs need major improvements. This study provides new insights on the use of ENMs in construction, exposure risks, and hazard communication.

Trends in the sizes and carbonaceous fractions of primary emitted particulate matter in China from 1960 to 2019

The health impacts of particulate matter (PM) depend on its concentration, size and composition. Herein, we quantified the changes in the emissions of primary PM2.5, PM2.5-10 and PM>10 with aerodynamic diameters of <2.5 μm, 2.5-10 μm and >10 μm, respectively, black carbon (BC), and organic carbon (OC) to address the changes and driving factors. The temporal trends of PM emissions follow Kuznets curves, with 1995 as the peak year when the gross domestic product per capita was only US$1023, showing a late-mover advantage. The fractions of PM2.5 : PM2.5-10 : PM>10 and BC : OC : non-carbonaceous-PM2.5 from various sectors varied following different trajectories. The mass fractions of PM2.5 : PM2.5-10 : PM>10 from iron-steel production industries changed from 21% : 12% : 67% in 1960 to 50% : 13% : 37% in 2019, showing a decrease in PM size. The fractions of BC were linearly correlated with PM2.5, whereas the dependence of OC on PM2.5 differed before and after 1995, owing to changes in residential emissions. Various factors influencing the changes in size and carbonaceous fraction were explored. The major factors were the promotion of dust-removal capacity and the transition in residential energy from solid fuels to emission-free fuels, which increased the fractions of fine PM and carbonaceous fraction.

Current views and trends of nanomaterials as vectors for gene delivery since the 21st century: a bibliometric analysis

BACKGROUND

Gene therapy is garnering increasing support due to its potential for a "once-delivered, lifelong benefit." The limitations of traditional gene delivery methods have spurred the advancement of bionanomaterials. Despite this progress, a thorough analysis of the evolution, current state, key contributors, focal studies, and future directions of nanomaterials in gene delivery remains absent.

METHODS

This study scrutinizes articles from the Web of Science, spanning 1 January 2 000, to 31 December 2023, employing various online tools for analysis and visualization.

RESULTS

The 21st century has witnessed consistent growth in scholarly work in this domain globally, with notable contributions from China and the US. At the same time, the Chinese Academy of Sciences (CAS), Harvard University, and Massachusetts Institute of Technology (MIT) have emerged as the most productive institutions, with CAS's academician Weihong Tan becoming the field's leading author. While drug delivery and nanoparticles (NPs) have been central themes for two decades, the research focus has shifted from modifying NPs and ultrafine particles to exploring polymer-hybrid NPs, mRNA vaccines, immune responses, green synthesis, and CRISPR/Cas tools.

CONCLUSIONS

This shift marks the transition from nanomaterials to bionanomaterials. The insights provided by this research offer a comprehensive overview of the field and valuable guidance for future investigations.

Ultrasound-mediated nanomaterials for the treatment of inflammatory diseases

Sterile and infection-associated inflammatory diseases are becoming increasingly prevalent worldwide. Conventional drug therapies often entail significant drawbacks, such as the risk of drug overdose, the development of drug resistance in pathogens, and systemic adverse reactions, all of which can undermine the effectiveness of treatments for these conditions. Nanomaterials (NMs) have emerged as a promising tool in the treatment of inflammatory diseases due to their precise targeting capabilities, tunable characteristics, and responsiveness to external stimuli. Ultrasound (US), a non-invasive and effective treatment method, has been explored in combination with NMs to achieve enhanced therapeutic outcomes. This review provides a comprehensive overview of the recent advances in the use of US-mediated NMs for treating inflammatory diseases. A comprehensive introduction to the application and classification of US was first presented, emphasizing the advantages of US-mediated NMs and the mechanisms through which US and NMs interact to enhance anti-inflammatory therapy. Subsequently, specific applications of US-mediated NMs in sterile and infection-associated inflammation were summarized. Finally, the challenges and prospects of US-mediated NMs in clinical translation were discussed, along with an outline of future research directions. This review aims to provide insights to guide the development and improvement of US-mediated NMs for more effective therapeutic interventions in inflammatory diseases.

Photoresponsive Bio-Heterojunctions Eliciting Immunogenicity to Prevent Infection Recurrence and Accelerating Chronic Wound Regeneration

Dynamic therapy utilizes reactive oxygen species (ROS) to antibacterial and enhance the innate immune system to treat bacterial infections. If ROS levels are too low, the elimination of pathogens and the enhancement of innate immunity cannot be achieved. However, excess accumulation of ROS may impact intracellular glutathione (GSH) levels, hindering T cell maturation and the establishment of immune memory. Herein, a multifunctional nanofiber membrane is designed, consisting of a polymer scaffold, MXene/CeO2 bio-heterojunctions (MX@Ce bio-HJs), and lactate oxidase (Lox) to balance the production of ROS, for the treatment of recurrent bacterial infections. In this system, MX@Ce bio-HJs upon near-infrared ray (NIR) generate photodynamic therapy, while Lox responds to the wound microenvironment exert chemodynamic therapy, synergistically produce ROS to rapidly eradicate bacteria, amplify the ability of dendritic cells to recognize and present antigens of bacterial fragments, and enhance innate immunity. Without NIR, MX@Ce bio-HJs showcase catalase-like and superoxide dismutase-like activities, scavenging subsequent ROS accumulation, promoting T cell maturation to form acquired immune memory, and combating recurrent bacterial infection. Such work highlights the potential to combat in situ bacterial infections and recurrent bacterial infections and inspires the development of future antibacterial therapies.

Mechanistic paradigms of immunotoxicity, triggered by nanoparticles - a review

Nanoparticles (NPs) possess the ability to penetrate cells and elicit a rapid and targeted immune response, influenced by their distinct physicochemical properties. These particles can engage with both micro and macromolecules, thereby impacting various downstream signaling pathways that may lead to cell death. This review provides a comprehensive overview of the primary mechanisms contributing to the immunotoxicity of both organic and inorganic nanoparticles. The effects of carbon-based nanomaterials (CNMs), including single-walled carbon nanotubes, multi-walled carbon nanotubes, graphene, and metal oxide nanoparticles, on various immune cell types such as macrophages, neutrophils, monocytes, dendritic cells (DCs), antigen-presenting cells (APCs), and RAW 264.7 cells are examined. The immune responses discussed encompass inflammation, oxidative stress, autophagy, and apoptosis. Additionally, the roles of pro-inflammatory cytokines such as IL-1β, IL-6, TNF-α, and IFN-γ, along with JAK/STAT signaling pathways, are highlighted. The interaction of NPs with oxidative stress pathways, including MAPK signaling and Nrf2/ARE signaling, is also explored. Furthermore, the mechanisms by which nanoparticles induce damage to organelles such as lysosomes, the endoplasmic reticulum, exosomes, and Golgi bodies within the immune system are addressed. The review also emphasizes the genotoxic and epigenetic mechanisms associated with the immunotoxicity of NPs. Recent advancements regarding the immunotherapeutic potential of engineered NPs are reported. The roles of autophagy and apoptosis in the immunotoxicity of NPs merit further investigation. In conclusion, understanding how engineered nanoparticles modulate immune responses may facilitate the prevention and treatment of human diseases, including cancer and autoimmune disorders.

Nanotechnology Driven Lipid and Metalloid Based Formulations Targeting Blood-Brain Barrier (3B) for Brain Tumor

 The evolution of nanotechnology-driven lipid and metalloid-based nanoformulations has garnered significant attention for developing effective drug delivery systems with position/time precision and efficacy. This study focuses on challenges of blood-brain barrier (BBB) and their pivotal role in drug targeting in chronic diseases such as brain tumors (BTs). These formulations encapsulate therapeutic agents within lipidic matrices, enhancing drug solubility, bioavailability, and targeted delivery. The diverse lipid materials used in these nanoformulations highlight their biocompatibility and versatility, covering a wide range of drugs. Emphasis is placed on metal nanoparticles, liposomes, ethosomes, quantum dots, carbon nanotubes, nanorobots, and micelles. The analysis explores their drug loading, stability, release characteristics, and bioavailability modulation. It also delves into the enhanced-permeability and retention (EPR) effect, crucial for passive targeting of tumors. Recent nanocarrier systems enable better penetration of therapeutic compounds through the BBB, addressing treatment failures in invasive BTs.This review highlights the latest nanotechnology developments and potential therapeutic approaches, serving as a valuable resource for researchers, clinicians, and pharmaceutical scientists.

Evaluation the toxic effects of Cobalt-Zinc Ferrite nanoparticles in experimental mice

Cobalt Zinc ferrite nanoparticles (NPs) were synthesized utilizing the auto-combustion flash method, with the general formula Co1 - xZnxFe2O4 (x = 0,0.35). This study aimed to evaluate the hepato-renal and systemic toxicity of Cobalt Zinc Ferrite nanoparticles (CZF NPs). A total of eighty female mice were utilized to ascertain the median lethal dose (LD50) of CF NPs (100 mg/kg) and CZF NPs (100 mg/kg). Thirty female CD1 mice were placed into three groups, each containing ten animals. In Group 1 (Gp1), mice were administered a 200 µl injection of sterile saline intraperitoneally (i.p.). During a 6-day period, Gp2 and Gp3 received injections of CF NPs and CFZ NPs. On day 14 after injection, hematological, biochemical, and histopathological data were measured. CZF NPs were characterized using X-ray Diffraction Analysis (XRD), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). There was a significant alteration in the overall body weight of mice injected with CZF NPs. Injections of CF NPs did not significantly alter red blood cells (RBC) counts, hemoglobin concentration (Hb), hematocrit percentage (Hct%), total white blood cells (WBCs), and platelets. However, injections of CZF NPs resulted in an increase in WBC count and a decrease in platelet count. Furthermore, injection of CZF NPs altered the differential leukocyte percentages. The liver and kidney functions in mice injected with CF NPs did not show any notable changes. However, mice treated with CZF NPs had considerable increases in liver and kidney bio-markers. The administration of CF NPS did not modify the histological structure of hepatic and renal tissues; however, the hepatic and renal structures were disrupted in animals injected with CZF NPs. Overall, the findings indicated high toxicity of CZF NPs in the mice used for the experiment.

SiO2 nanoparticles as disruptors of endogenous resolution mechanisms of inflammatory responses that exacerbate pneumonia

Occupational exposure to engineered nanomaterials (ENMs) is increasing in the workplace and can impact human health. Amorphous silicon dioxide nanoparticles (SiO2 NPs) are widely produced respirable ENMs used in commercial products. We have investigated their impact on lung inflammation resolution and bacterial defense. Mice exposed to SiO2 NPs, followed by bacteria, exhibited increased lung inflammation, bacterial proliferation, and lung damage compared to mice not exposed to NPs. SiO2 NPs increased human macrophage production of pro-inflammatory mediators and disrupted phagocytosis of bacteria and efferocytosis of apoptotic neutrophils - pivotal responses for host defense and inflammation resolution. A pro-resolving mediator, resolvin D5 (RvD5), restored macrophage phagocytosis of bacteria and partially controlled excess lung inflammation after SiO2 NPs. These findings demonstrate that SiO2 NPs disrupt endogenous resolution processes to give rise to heightened lung inflammation and infection. RvD5 reduced inflammation and partially restored endogenous resolution cellular processes, suggesting that RvD5 can reduce ENP disruption of resolution.

Transcriptomic and physiological analyses reveal the toxic effects of inorganic filters (nZnO and nTiO2) on scleractinian coral Galaxea fascicularis

The effects of sunscreen on scleractinian corals have garnered widespread attention; however, the toxic effects and mechanisms remain unclear. This study investigated the toxicological effects of two common inorganic filters used in sunscreens, nano zinc oxide and titanium dioxide (nZnO and nTiO₂), on the reef-building coral Galaxea fascicularis, focusing on the phenotypic, physiological, and transcriptomic responses. The results showed that after exposure to 0.8 mg/L of nZnO and 30 mg/L of nTiO₂ for 48 h, all coral polyps exhibited retraction. Zn and Ti ions were detected in coral tissues at concentrations of 67.18 and 24.87 μg/g, respectively, indicating the accumulation of nZnO and nTiO2 in coral tissues. The zooxanthellae density, Fv/Fm, and chlorophyll-a content decreased significantly. The activity of antioxidant enzymes showed an increasing trend. Meanwhile, glutamine synthetase and glutamate dehydrogenase activities exhibited a decreasing trend. The health status of corals was impacted as a result of nZnO and nTiO2 stress. Transcriptomic analysis showed that the toxicity mechanisms of nZnO and nTiO2 differed in corals. Following exposure to nZnO, differentially expressed genes (DEGs) in corals were mainly enriched in signaling pathways related to immune response. The genes related to innate immunity, such as MASP1, MUC5AC, TLRs, and C2, were significantly upregulated, indicating that nZnO exposure induces an innate immune response in corals. Meanwhile, following nTiO2 exposure, the upregulated DEGs were mainly enriched in signaling pathways related to transporter activity. In contrast, the downregulated DEGs were mainly enriched in energy metabolism pathways, indicating that nTiO2 disrupted the energy supply of corals, thereby leading to an increased demand for nutrient transport. This study reveals the toxic effects of nZnO and nTiO2, and their mechanisms of action on scleractinian corals, providing a reference for further assessing the toxicity of sunscreen on corals.

Toxicity of copper oxide nanoparticles in barley: induction of oxidative stress, hormonal imbalance, and systemic resistances

BACKGROUND

Over the years, nanoparticles have emerged as a promising approach for improving crop growth, yield, and overall agricultural sustainability. However, there has been growing concern about the potential adverse effects of nanoparticles in the agricultural sector and the environment. The present study aimed to investigate the detrimental effects of high (1000 mg L-1) concentrations of copper oxide nanoparticles (CuO NPs) on barley seedlings. The equivalent concentrations of CuO bulk and the ionic form of copper were also used in the experiments for comparative analysis. CuO NPs were characterized by Field Emission-Scanning Electron Microscopy, Dynamic Light Scattering, Zeta Potential analysis, and X-ray Diffraction prior to the application. Barley seedlings were subjected to the foliar application of CuO NP, CuO bulk, ionic Cu, and control group. The presence of CuO NPs in barley leaves was confirmed 72 hours after treatment by energy-dispersive X-ray analysis.

RESULTS

The results showed a CuO NPs treatment led to an impairment of nutrient balance in barley leaves. An increase in hydrogen peroxide content followed by the higher specific activity of catalase and ascorbate peroxidase was also observed in response to CuO NPs, CuO bulk, and Cu2+ ions. The profile of phytohormones including auxins (IAA and IBA), Gibberellins (GA1, GA4, and GA9), abscisic acid (ABA), ethylene (ET), and jasmonic acid (JA) significantly affected by CuO NPs, CuO bulk, and Cu2+ ions. The transcripts of the PR1 gene involved in systemic acquired resistance (SAR) and LOX-1 and PAL involved in induced systemic resistance (ISR) were significantly upregulated in response to CuO NPs treatment.

CONCLUSION

Our findings suggest that the systemic resistances in barley seedlings were induced by higher accumulation of ABA, ET, and JA under CuO NPs treatment. The activation of systemic resistances indicated the involvement of both SAR and SAR pathways in the response to CuO NPs in barley.

Carbon Quantum Dot Nanoparticles Enhance the Efficacy of Spodoptera littoralis Nucleopolyhedrovirus Suspoemulsion

This study evaluates the efficacy of Spodoptera littoralis nucleopolyhedrovirus (SpliNPV) and laboratory-synthesized carbon quantum dot nanoparticles (CQDNPs) against the second instar Spodoptera littoralis larvae under laboratory and greenhouse conditions. Individually, both SpliNPV and CQDNPs exhibited substantial lethality (91.6% and 83.3% at 1 × 108 OBs/ml and 700 mg/ml, respectively) (p < 0.05). The LC50 values were 1.88 × 105 OB/ml and 434.2 mg/mL, and the LT50 values were 8.9 and 9.8 days, respectively. Four LC-based combined treatments demonstrated significant additive effects, with the SpliNPV (LC50) + CQDNPs (LC25) combination achieving the optimum effect with a mortality rate of 86.3% and an LT50 value of 6.6 days, leading to its selection for the suspoemulsion nanoparticle (SENP) formulation. The SENP formulation displayed superior performance, achieving the highest mortality rates and fastest killing times across all environments: 89.0% in laboratory conditions, 83.3% on eggplant plants, and 76.6% on pepper plants. In contrast, the suspoemulsion (SE) and unformulated (UF) formulations showed lower efficacy, emphasizing the importance of formulation in enhancing the biological activity of SpliNPV. The LT50 values further supported these findings, with the SENP formulation demonstrating the shortest LT50 values, indicating faster lethality. A significant decrease in CHS-B, IIM2, PER3, REPAT14, and CDA1 expression was observed, particularly in the combined CQDNPs + SpliNPV treatment, while API expression increased significantly. These findings highlight the potential of nanoparticle-enhanced formulations like SENP, and integrating CQDNPs with SpliNPV can significantly enhance pest control efficacy.

Knock-out mouse models and single particle ICP-MS reveal that SP-D and SP-A deficiency reduces agglomeration of inhaled gold nanoparticles in vivo without significant changes to overall lung clearance

The role of surfactant proteins A and D (SP-A and SP-D) in lung clearance and translocation to secondary organs of inhaled nanoparticles was investigated by exposing SP-A and SP-D knockout (AKO and DKO) and wild type (WT) mice nose-only for 3 hours to an aerosol of 20 nm gold nanoparticles (AuNPs). Animals were euthanised at 0-, 1-, 7- and 28-days post-exposure. Analysis by inductively coupled plasma mass spectrometry (ICP-MS) of the liver and kidneys showed that extrapulmonary translocation was below the limits of detection. Imaging of the lungs by laser ablation ICP-MS confirmed the homogenous distribution of AuNPs. Coherent anti-Stokes Raman Scattering, Second Harmonic Generation and Two-Photon Fluorescence imaging were applied for semi-quantitative analysis of the uptake of AuNPs by alveolar macrophages and found uptake increased with time post-exposure, peaking after 7 days, and with the largest increase in uptake being in WT mice. Single particle ICP-MS allowed particle counting and sizing of AuNPs in the lungs showing that particle agglomeration following deposition within the lung was greater for the wildtype than the knockout models, indicating a role for SP-A and SP-D in agglomeration, however, any effect of this on overall lung clearance was minimal. For all groups, the Au (mass) lung burden initial clearance half-time was approximately 20-25 d, however, the AuNP (particle number) lung burden clearance half-time was shorter at approximately 10 days. In general terms, differences between the results for the three models were limited, indicating the preferential clearance of smaller particles from the lung.

Effects of perfluorooctanoic acid and nano titanium dioxide on the immune response and energy allocation in Mytilus coruscus

Perfluorooctanoic acid (PFOA) functions as a surfactant, while nano-titanium dioxide (nano-TiO2) serves as an antibacterial agent. These substances are extensively utilized in industrial production and, upon release into aquatic environments, pose significant threats to the viability and development of marine organisms. However, research into the effects of PFOA and nano-TiO2 on the immune functions and cellular energy allocation (CEA) of bivalves remains limited. To investigate the impact of PFOA and nano-TiO2 on immunity and cellular energy, we exposed Mytilus coruscus individuals to different concentrations of PFOA (2 and 200 μg/L), either alone or in combination with nano-TiO2 (0.1 mg/L, particle size: 25 nm) for 14 days. We found that the co-exposure to PFOA and nano-TiO2 had significant interactive effects on multiple immune function parameters of mussels. PFOA and nano-TiO2 notably reduced the total hemocyte count (THC), esterase activity (EST), mitochondrial number (MN), lysosomal content (LYSO), and cell viability, while concurrently elevating hemocyte mortality (HM) and reactive oxygen species (ROS) levels. Some immune-related genes, such as Tumor Necrosis Factor-alpha (TNF-α) and Myeloid Differentiation Primary Response 88 (MyD88) were downregulated, while others such as Interleukin 17 (IL-17) and Transforming Growth Factor-beta (TGF-β) were upregulated after 14-day exposure to combined pollutant exposure. Furthermore, negative effects on CEA were observed under both individual and combined pollutant stress. Therefore, PFOA and nano-TiO2 regulate cellular and humoral immunity through the regulation of immune genes as mediators, while simultaneously disrupting cellular energy metabolism. The immunotoxicity of organic and particulate pollutants, and their mixtures, thus poses a significant risk to the immune defense capabilities of mussel populations in polluted coastal environments.