The protein corona and its effects on nanoparticle-based drug delivery systems

Protein corona formation on supramolecular polymer nanoparticles causes differential endosomal sorting resulting in an attenuated NLRP3 inflammasome activation

Upon introduction into biological environments, nanoparticles undergo the spontaneous formation of a dynamic protein corona, which continually evolves and significantly modifies their physicochemical properties and interactions with biological systems. This evolving protein corona can critically impact the nanoparticles' endocytic pathways and targeting efficiency, potentially altering their functional characteristics and obscuring their intended therapeutic effects. Despite considerable focus on the characterization of corona proteins and their impact on nanoparticle uptake, the intracellular processes and their effects on immunogenicity are not yet thoroughly understood. Supramolecular polymer nanoparticles (SNPs) with a highly hydrophobic core are recognized for triggering NLRP3 inflammasome activation, a key component of the innate immune system. Here, it is reported that the protein corona formation on SNPs exerts an inhibitory effect on the activation pathway of NLRP3 inflammasome. The protein corona impairs the intrinsic capacity of SNPs to induce lysosomal membrane rupture, thereby diminishing the cellular stress signals necessary for the formation of the NLRP3 inflammasome complex. Furthermore, the cells transport SNPs with an attached protein corona to recycling endosomes, where they are sorted and prepared for exocytosis. Conversely, nascent SNPs are primarily confined to late endosomes and lysosomes, leading to lysosomal rupture and inflammasome activation. This differential routing reflects the significant impact of the protein corona on the cellular handling and subsequent biological activity of nanoparticles. In summary, this study elucidates the fundamental role of the protein corona in shaping the intracellular disposition of nanoparticles, with implications for modulating their interactions with the immune system.

Self-Assembling protein nanoparticle platform for multivalent antigen delivery in vaccine development

Nanoparticle vaccines can efficiently and repeatedly display multivalent antigens, thereby improving the targeted delivery of antigens and inducing more durable immune responses, making them an important representative of novel vaccines. The global COVID-19 pandemic has accelerated the development of nanoparticle vaccines, offering a promising solution for the prevention and control of infectious diseases. Currently, the development of nanoparticle vaccines involves the use of various types of nanoparticles, including liposomes, polymers, inorganic materials, and emulsions. Protein nanoparticles candidate vaccines are attracting increasing attention because of their unique antigen presentation methods and self-assembly characteristics during their development, leading to a broad consensus on their promising future. Naturally self-assembling protein nanoparticles, such as ferritin, enhance antigen presentation, which aids in the activation of both humoral and cellular immune responses. This has led to significant advancements in the study of hepatitis B virus. Meanwhile, some synthetically engineered protein nanoparticles, such as mi3, and I53-50, can induce higher antibody titers through chemical conjugation with the SpyTag-SpyCatcher system, thereby providing better immunoprotection and showing promising prospects in the prevention of H1N1 and H3N2 influenza virus infections. This article reviews the unique advantages of protein nanoparticles as antigen delivery platforms, progress made in immunological design mechanisms, advances in the application of related adjuvants in preclinical and clinical trials, and the performance of commonly used computationally designed protein nanoparticles in preclinical trials, with a particular emphasis on the progress in the application of cationic nanoparticle vaccines. The aim is to provide future researchers with effective adjuvant strategies and high-quality selections for computationally designed protein nanoparticles, thereby promoting the clinical trial process of protein nanoparticles vaccines.

Surface-engineered nanobeads for regioselective antibody binding: A robust immunoassay platform leveraging catalytic signal amplification

Regulating protein interactions and protein corona formation of nanomaterials is crucial for advancing nanomedicine, where surface engineering of nanomaterials plays a pivotal role in precise control over biological interactions. Here, we present a surface-engineered nanoparticle-based immunoassay platform using carboxyl-enriched polystyrene nanobeads (CEPS) with regioselectively controlled antibody-binding properties. Proteomic analysis and theoretical simulation revealed that CEPS has an enhanced Fc-specific binding affinity for immunoglobulins compared to conventional carboxylated polystyrene beads, with a higher surface carboxyl density critically mediating protein interactions. This regioselective antibody binding with unique Fc-specific affinity eliminates the need for complex surface modifications, streamlining the assay process and broadening the applicability across various immunoassay formats. Additionally, incorporating a palladium catalyst within CEPS enables solvent-triggered on-demand catalytic signal amplification using a leucodye substrate, providing a more stable alternative to enzyme-based methods while significantly enhancing detection sensitivity and stability. The platform demonstrated enhanced performance in detecting clinically relevant biomarkers, including C-reactive protein, interferon-gamma, and the receptor-binding domain of SARS-CoV2, achieving lower detection limits and faster response times compared to conventional enzyme-based ELISA systems. Notably, the CEPS-based assay retained catalytic activity for over 140 days at room temperature, underscoring its potential for reliable, long-term use in diverse diagnostic applications.

Inorganic nanoparticles and blood-brain barrier modulation: Advancing targeted neurological therapies

The blood-brain barrier (BBB) is a protective barrier that complicates the treatment of neurological disorders. Pharmaceutical compounds encounter significant challenges in crossing the central nervous system (CNS). Nanoparticles (NPs) are promising candidates for treating neurological conditions as they help facilitate drug delivery. This review explores the diverse characteristics and mechanisms of inorganic NPs (INPs), including metal-based, ferric-oxide, and carbon-based nanoparticles, which facilitate their passage through the BBB. Emphasis is placed on the physicochemical properties of NPs such as size, shape, surface charge, and surface modifications and their role in enhancing drug delivery efficacy, reducing immune clearance, and improving BBB permeability. Specific synthesis approaches are demonstrated, with an emphasis on the influence of each one on NP property, biological activity and the capability of an NP for its intended application. As for the advances in the field, the review emphasizes those characterized the NP formulation and surface chemistry that conquered the BBB and tested the need for its alteration. Current findings indicate that NP therapy can in the future enable effective targeting of specific brain disorders and eventually evolve this drug delivery system, which would allow for lower doses with less side effects.

Nanodiamond-Protein hybrid Nanoparticles: LHRH receptor targeted and co-delivery of doxorubicin and dasatinib for triple negative breast cancer therapy

Triple Negative Breast Cancer (TNBC) is an aggressive type of breast cancer that is difficult to treat with conventional therapies. This study aimed to develop a novel therapeutic approach using a multifunctional protein-nanodiamond nanocomposite to co-deliver doxorubicin (DOX) and dasatinib (DAS) to cancer cells via luteinising hormone-releasing hormone receptors. Nanodiamonds help retain DOX in targeted cells, while α-lactalbumin efficiently encapsulates DAS, reducing side effects. We successfully formulated the nanocomposite with over 80 % drug loading efficiency for both drugs. The imine Schiff-base bond in the nanocomposite hydrolyzes in the acidic pH tumor environment, triggering approximately 65 % drug release after 72 h, compared to less than 20 % in neutral pH. In vitro studies showed enhanced uptake of DOX and DAS in TNBC cell lines, potentially overcoming drug resistance. The combined delivery showed enhanced synergistic cytotoxic effects in drug-resistant TNBC cell models. For example, in the MDA-MB-231 cell line, the IC50 of DOX dropped to 45.63 ng/ml, while in MDA-MB-468, DAS decreased to 35.85 ng/ml with nanoparticle therapy. In vivo experiments utilizing a TNBC mouse model demonstrated the therapeutic effectiveness of the nanocomposite, leading to a 55 % reduction in tumor growth and enhanced survival rates. All mice given the nanocomposite survived after 44 days, but most treated with the DOX/DAS mixture died by day 28. This research showcases multifunctional nanocomposites as targeted drug delivery systems for TNBC, improving drug uptake and cytotoxicity. This strategy presents a promising method for treating drug-resistant breast cancer, with potential clinical applications and synergy with other therapies.

Zein-sodium caseinate-diosmin nanoparticles as a promising anti-cancer agent with targeted efficacy against A2780 cell line

This research investigated the potential of zein-sodium caseinate-diosmin nanoparticles (ZCD-NPs) as an anti-cancer agent against the A2780 cell line. Dynamic light scattering (DLS) analysis showed that ZCD-NPs have an average size of 265.30 nm with a polydispersity index of 0.21, indicating good uniformity suitable for pharmaceutical applications. Fourier transform infrared spectroscopy (FTIR) confirmed the successful incorporation of diosmin into the NPs and highlighted the interactions between the components. Field emission scanning electron microscopy (FESEM) images showed spherical NPs with smooth surfaces, suggesting stability and high production quality. Encapsulation efficiency was remarkably high, at 93.45%. Cytotoxicity assays showed a dose-dependent effect of ZCD-NPs, with A2780 cells showing significant sensitivity compared to normal HDF cells, indicating selective targeting of cancer cells. Flow cytometry analysis confirmed that ZCD-NPs induced apoptosis and necrosis in A2780 cells, as evidenced by increased expression of apoptotic genes such as p53 and caspases 8 and 9. In addition, ZCD-NPs exhibited potent antioxidant activity, effectively scavenging free radicals. These results suggest that ZCD-NPs have promising properties for targeted cancer therapy and antioxidant applications, which warrant further exploration in clinical settings.

Development of Biocompatible, UV and NIR Excitable Nanoparticles with Multiwavelength Emission and Enhanced Colloidal Stability

The development of functional nanoprobes for biomedical applications is highly important in the field of modern nanotechnology. Due to strict requirements, such as the ability to be excited using irradiation, which allows deep tissue penetration, nonblinking behavior, and good optical and colloidal stability, the choice of nanoparticles is limited, and their synthesis is challenging. Among all of the functional nanoprobes for biomedical purposes, upconverting nanoparticles, especially those with more complex architectures (e.g., core-shell or core-shell-shell), are the most promising candidates. This study demonstrates advanced synthetic routes for constructing biocompatible nanoprobes with tunable optical properties and colloidal stability. The core-shell-shell architecture of the nanoprobes allows excitation from at least four sources, such as 272 and 394 nm of near-ultraviolet (near-UV) irradiation and 980 and 808 nm near-infrared (NIR) lasers. Furthermore, Gd-matrix-based nanoprobes doped with lanthanide ions (Nd3+, Yb3+, Tm3+, and Eu3+) are known for their paramagnetic properties for magnetic resonance imaging (MRI) imaging as well as upconversion luminescence with diverse emission bands across the entire visible spectrum. This feature is highly desirable for photodynamic therapy applications, as the upconversion emission of the proposed nanoprobes could overlap with the absorption band of commonly used photosensitizers and could potentially result in an efficient energy transfer process and enhanced generation of reactive oxygen species or singlet oxygen.

Design, current states, and challenges of nanomaterials in anti-neuroinflammation: A perspective on Alzheimer's disease

Alzheimer's disease (AD), an age-related neurodegenerative disease, brings huge damage to the society, to the whole family and even to the patient himself. However, until now, the etiological factor of AD is still unknown and there is no effective treatment for it. Massive deposition of amyloid-beta peptide(Aβ) and hyperphosphorylation of Tau proteins are acknowledged pathological features of AD. Recent studies have revealed that neuroinflammation plays a pivotal role in the pathology of AD. With the rise of nanomaterials in the biomedical field, researchers are exploring how the unique properties of these materials can be leveraged to develop effective treatments for AD. This article has summarized the influence of neuroinflammation in AD, the design of nanoplatforms, and the current research status and inadequacy of nanomaterials in improving neuroinflammation in AD.

Preparation of sodium alginate and chitosan modified curcumin liposomes and study on the formation of protein corona

Curcumin (CUR) is a polyphenolic compound extracted from plants with a wide range of pharmacological activities. However, the low stability and bioavailability limits its practical application. This work utilized the chitosan (CH) and sodium alginate (SA) to modify the surface of the liposome to improve the stability of curcumin. Studies on the adsorption of pepsin to the surface of liposomes and the formation of protein coronas (PCs) were also carried out to investigate the in vivo behavior of the sodium alginate and chitosan modified curcumin liposomes (SA-CH-LPs). The result shown that the average particle size of SA-CH-LPs was around 220.7 ± 1.68 nm. X-ray Diffractometer (XRD) and differential scanning calorimeter (DSC) confirmed the successful preparation of SA-CH-LPs and illustrated their crystalline characteristics. The cytotoxicity of SA-CH-LPs was determined by CCK-8 assay and the results showed that the cell viability was above 80 % at different concentrations. In vitro results showed that the bioaccessibility of SA-CH-LPs (87.9 %) was better than curcumin liposomes (LPs) (66.4 %), and could better resist to catabolic degradation in the gastrointestinal environment. This work could provide the feasibility for improving the stability and bioaccessibility of the curcumin liposome, as well as given the preliminary evidence for investigation of the interaction with enzyme during the in vivo digestion process for the further application in food.

Control of biomedical nanoparticle distribution and drug release in vivo by complex particle design strategies

The utilization of targeted nanoparticles as a selective drug delivery system is a powerful tool to increase the amount of active substance reaching the target site. This can increase therapeutic efficacy while reducing adverse drug effects. However, nanoparticles face several challenges: upon injection, the immediate adhesion of plasma proteins may mask targeting ligands, thereby diminishing the target cell selectivity. In addition, opsonization can lead to premature clearance and the widespread presence of receptors or enzymes limits the accuracy of target cell recognition. Nanoparticles may also suffer from endosomal entrapment, and controlled drug release can be hindered by premature burst release or insufficient particle retention at the target site. Various strategies have been developed to address these adverse events, such as the implementation of switchable particle properties, regulating the composition of the formed protein corona, or using click-chemistry based targeting approaches. This has resulted in increasingly complex particle designs, raising the question of whether this development actually improves the therapeutic efficacy in vivo. This review provides an overview of the challenges in targeted drug delivery and explores potential solutions described in the literature. Subsequently, appropriate strategies for the development of nanoparticular drug delivery concepts are discussed.

Membrane Fusion-Based Drug Delivery Liposomes Transiently Modify the Material Properties of Synthetic and Biological Membranes

Many drug targets are located in intracellular compartments of cells but they often remain inaccessible to standard imaging and therapeutic agents. To aid intracellular delivery, drug carrier nanoparticles have been used to overcome the barrier imposed by the plasma membrane. The carrier must entrap large amounts of cargo, efficiently and quickly deliver the cargo in the cytosol or other intracellular compartments, and must be inert; they should not induce cellular responses or alter the cell state in the course of delivery. This study demonstrates that cationic liposomes with high charge density efficiently fuse with synthetic membranes and the plasma membrane of living cells. Direct fusion efficiently delivers large amounts of cargo to cells and cell-like vesicles within seconds, bypassing slow and often inefficient internalization-based pathways. These effects depend on liposome charge density, concentration, and the helper lipid. However, fusion-mediated cargo delivery results in the incorporation of large amounts of foreign lipids, causing changes to the material properties of these membranes, namely modifications in membrane packing and fluidity, induction of membrane curvature, decrease in surface tension, and the formation of (short-lived) pores. Importantly, these effects are transient and liposome removal allows cells to recover their state prior to liposome interaction.

Anticancer therapeutic potential of multimodal targeting agent- "phosphorylated galactosylated chitosan coated magnetic nanoparticles" against N-nitrosodiethylamine-induced hepatocellular carcinoma

Superparamagnetic iron oxide nanoparticles (SPIONs) are extensively used as carriers in targeted drug delivery and has several advantages in the field of magnetic hyperthermia, chemodynamic therapy and magnet assisted radionuclide therapy. The characteristics of SPIONs can be tailored to deliver drugs into tumor via "passive targeting" and they can also be coated with tissue-specific agents to enhance tumor uptake via "active targeting". In our earlier studies, we developed HCC specific targeting agent- "phosphorylated galactosylated chitosan"(PGC) for targeting asialoglycoprotein receptors. Considering their encouraging results, in this study we developed a multifunctional targeting system- "phosphorylated galactosylated chitosan-coated magnetic nanoparticles"(PGCMNPs) for targeting HCC. PGCMNPs were synthesized by co-precipitation method and characterized by DLS, XRD, TEM, VSM, elemental analysis and FT-IR spectroscopy. PGCMNPs were evaluated for in vitro antioxidant properties, uptake in HepG2 cells, biodistribution, in vivo toxicity and were also evaluated for anticancer therapeutic potential against NDEA-induced HCC in mice model in terms of tumor status, electrical properties, antioxidant defense status and apoptosis. The characterization studies confirmed successful formation of PGCMNPs with superparamagnetic properties. The internalization studies demonstrated (99-100)% uptake of PGCMNPs in HepG2 cells. These results were also supported by biodistribution studies in which increased iron content (296%) was noted inside the hepatocytes. Further, PGCMNPs exhibited no in vivo toxicity. The anticancer therapeutic potential was evident from observation that PGCMNPs treatment decreased tumor bearing animals (41.6%) and significantly (p ≤ 0.05) lowered tumor multiplicity. Overall, this study indicated that PGCMNPs with improved properties are efficiently taken-up by hepatoma cells and has therapeutic potential against HCC. Further, this agent can be tagged with 32P and hence can offer multimodal cancer treatment options via radiation ablation as well as magnetic hyperthermia.

Phytoactive-Loaded Lipid Nanocarriers for Simvastatin Delivery: A Drug Repositioning Strategy Against Lung Cancer

Background/Objectives: Drug repurposing explores new applications for approved medications, such as simvastatin (SV), a lipid-lowering drug that has shown anticancer potential but is limited by solubility and side effects. This study aims to enhance SV delivery and efficacy against lung cancer cells using bioactive lipid nanoparticles formulated with plant-derived monoterpenes as both nanostructuring agents and anticancer molecules. Methods: Lipid nanoparticles were produced by ultrasonication and characterized for morphology, size, zeta potential, and polydispersity index (PDI). Monoterpenes (linalool-LN-, limonene, 1,8-cineole) or Crodamol® were used as liquid lipids. Encapsulation efficiency (EE), release profiles, stability, biocompatibility, protein adsorption, cytotoxicity, and anticancer effects were evaluated. Results: The nanoparticles exhibited high stability, size: 94.2 ± 0.9-144.0 ± 2.6 nm, PDI < 0.3, and zeta potential: -4.5 ± 0.7 to -16.3 ± 0.8 mV. Encapsulation of SV in all formulations enhanced cytotoxicity against A549 lung cancer cells, with NLC/LN/SV showing the highest activity and being chosen for further investigation. Sustained SV release over 72 h and EE > 95% was observed for NLC/LN/SV. SAXS/WAXS analysis revealed that LN altered the crystallographic structure of nanoparticles. NLC/LN/SV demonstrated excellent biocompatibility and developed a thin serum protein corona in vitro. Cellular studies showed efficient uptake by A549 cells, G0/G1 arrest, mitochondrial hyperpolarization, reactive oxygen species production, and enhanced cell death compared to free SV. NLC/LN/SV more effectively inhibited cancer cell migration than free SV. Conclusions: NLC/LN/SV represents a promising nanocarrier for SV repurposing, combining enhanced anticancer activity, biocompatibility, and sustained stability for potential lung cancer therapy.

Interaction of zinc oxide nanoparticles and nanorods with immunoglobulin G and underlying effects on MCF-7 breast cancer cells

Protein corona formation is significantly impacted by the physicochemical characteristics of nanomaterials. The interaction of zinc oxide nanoparticles (ZnO NPs) and nanorods (NRs) with human immunoglobulin G (IgG) was investigated. Additionally, the anticancer effects of ZnO NPs and ZnO NRs in the forms of pristine or combined with protein coronas were evaluated in MCF-7 breast cancer cells. The results demonstrated that following the interaction with IgG, ZnO NPs with a hydrodynamic diameter (nm), zeta potential (mV), and UV-visible maximum wavelength (λmax, nm) of 9.75 ± 1.77, -21.89 ± 1.02, and 368 ± 0.32, respectively, showed a significant increase in size and λmax while decreasing in zeta potential. After ZnO NRs [hydrodynamic diameter (nm) of 68.45 ± 5.49, zeta potential (mV) of -33.04 ± 4.87, and λmax (nm) of 371 ± 0.48] interacted with IgG, these effects varied differently than those of ZnO NPs with IgG. The higher ΔG° value of the ZnO NR-IgG complex relative to the ZnO NP-IgG complex suggested greater stability of the formed complex in the presence of NRs than NPs. Additionally, in silico investigations demonstrated that the predominance of electrostatic forces promoted interactions between IgG and ZnO NPs or ZnO NRs. When interacting with ZnO NRs, the IgG conformation was more disrupted relative to ZnO NPs. Cellular studies showed that ZnO NPs, ZnO NRs, ZnO NP-IgG corona, and ZnO NR-IgG corona had IC50 values (μg/mL) of 161, 114, 118, and 62 μg/mL, respectively, in MCF-7 breast cancer cells. Additionally, qPCR and LDH assays demonstrated that, of all the examined groups, the ZnO NR-IgG corona caused the highest amount of cytotoxicity in MCF-7 breast cancer cells by altering the expression of Bax and Bcl-2 mRNA and triggering membrane damage.

Transforming Medicine: Cutting-Edge Applications of Nanoscale Materials in Drug Delivery

Since their inception in the early 1960s, the development and use of nanoscale materials have progressed tremendously, and their roles in diverse fields ranging from human health to energy and electronics are undeniable. The application of nanotechnology inventions has revolutionized many aspects of everyday life including various medical applications and specifically drug delivery systems, maximizing the therapeutic efficacy of the contained drugs by means of bioavailability enhancement or minimization of adverse effects. In this review, we utilize the CAS Content Collection, a vast repository of scientific information extracted from journal and patent publications, to analyze trends in nanoscience research relevant to drug delivery in an effort to provide a comprehensive and detailed picture of the use of nanotechnology in this field. We examine the publication landscape in the area to provide insights into current knowledge advances and developments. We review the major classes of nanosized drug delivery systems, their delivery routes, and targeted diseases. We outline the most discussed concepts and assess the advantages of various nanocarriers. The objective of this review is to provide a broad overview of the evolving landscape of current knowledge regarding nanosized drug delivery systems, to outline challenges, and to evaluate growth opportunities. The merit of the review stems from the extensive, wide-ranging coverage of the most up-to-date scientific information, allowing unmatched breadth of landscape analysis and in-depth insights.

MSCs biomimetic ultrasonic phase change nanoparticles promotes cardiac functional recovery after acute myocardial infarction

Acute Myocardial Infarction (AMI) has seen rising cases, particularly in younger people, leading to public health concerns. Standard treatments, like coronary artery recanalization, often don't fully repair the heart's microvasculature, risking heart failure. Advances show that Mesenchymal Stromal Cells (MSCs) transplantation improves cardiac function after AMI, but the harsh microenvironment post-AMI impacts cell survival and therapeutic results. MSCs aid heart repair via their membrane proteins and paracrine extracellular vesicles that carry microRNA-125b, which regulates multiple targets, preventing cardiomyocyte death, limiting fibroblast growth, and combating myocardial remodeling after AMI. This study introduces ultrasound-responsive phase-change bionic nanoparticles, leveraging MSCs' natural properties. These particles contain MSC membrane and microRNA-125b, with added macrophage membrane for stability. Using Ultrasound Targeted Microbubble Destruction (UTMD), this method targets the delivery of MSC membrane proteins and microRNA-125b to AMI's inflamed areas. This aims to enhance cardiac function recovery and provide precise, targeted AMI therapy.

ROS Regulation in CNS Disorder Therapy: Unveiling the Dual Roles of Nanomedicine

The treatment of brain diseases has always been the focus of attention. Due to the presence of the blood-brain barrier (BBB), most small molecule drugs are difficult to reach the brain, leading to undesirable therapeutic outcomes. Recently, nanomedicines that can cross the BBB and precisely target lesion sites have emerged as thrilling tools to enhance the early diagnosis and treat various intractable brain disorders. Extensive research has shown that reactive oxygen species (ROS) play a crucial role in the occurrence and progression of brain diseases, including brain tumors and neurodegenerative diseases (NDDs) such as Alzheimer's disease, Parkinson's disease, stroke, or traumatic brain injury, making ROS a potential therapeutic target. In this review, on the structure and function of BBB as well as the mechanisms are first elaborated through which nanomedicine traverses it. Then, recent studies on ROS production are summarized through photodynamic therapy (PDT), chemodynamic therapy (CDT), and sonodynamic therapy (SDT) for treating brain tumors, and ROS depletion for treating NDDs. This provides valuable guidance for the future design of ROS-targeted nanomedicines for brain disease treatment. The ongoing challenges and future perspectives in developing nanomedicine-based ROS management for brain diseases are also discussed and outlined.

Therapeutic Advantages of Nanoparticle-Impregnated Lysozyme Conjugates toward Amyloid-β Fibrillation and Antimicrobial Activity

The interaction of protein with nanoparticles (NPs) of varying shape and/or size boosts our understanding on their bioreactivity and establishes a comprehensive database for use in medicine, diagnosis, and therapeutic applications. The present study explores the interaction between lysozyme (LYZ) and different NPs like graphene oxide (GO) and zinc oxide (ZnO) having various shapes (spherical, 's', and rod-shaped, 'r') and sizes, focusing on their binding dynamics and subsequent effects on both the protein fibrillation and antimicrobial properties. Typically, GO is considered a promising medium due to its apparent inhibition and prolonged lag phase for LYZ fibrillation. However, the present results showed that spherical ZnO NPs (sZnO) offer superior efficacy in modulating fibrillation with an extended lag time of about 158.70 h, further emphasizing the importance of detailed investigation on the nanomaterial characteristics and fibril formation kinetics beyond initial observations. The experimental findings further confirmed a strong correlation between the binding affinity of NPs to the native protein and their effective inhibition of protein denaturation, ultimately preventing fibril formation. Interestingly, the lysozyme nanoconjugates showed intriguing bactericidal effects, as confirmed through the agar plate assay and SEM imaging, over the native protein. Overall, this study shows that appropriate bionanomaterials can exhibit multifunctional properties, which paves the way for a deeper investigation of NP characteristics, ultimately benefiting a wide array of intriguing research.

Evaluating the In Situ Effects of Whole Protein Coronas on the Biosensing of Antibody-Immobilized Nanoparticles Using Two-Color Fluorescence Nanoparticle Tracking Analysis

The formation of protein coronas around engineered nanoparticles (ENPs) in biological environments is critical in nanomedicine, as these coronas significantly influence the biological behavior of ENPs. Despite extensive research on protein coronas, understanding the in situ influence of whole (soft plus hard) protein coronas has remained challenging. In this study, we demonstrate a strategy to assess the in situ effects of whole coronas on the model biosensing of anti-IgG using IgG-conjugated gold nanoparticles (IgG-AuNPs) through fluorescence nanoparticle tracking analysis (F-NTA), which enables the selective tracking of fluorescent particles within complex media. In our approach, anti-IgG and IgG-AuNPs were labeled with distinct fluorescent dyes. The accordance in hydrodynamic diameter distributions observed at two different wavelengths verifies the successful capture of anti-IgG on the IgG-AuNPs. The counting of fluorescent anti-IgG within the size distribution allows for a quantitative assessment of biosensing efficiency. This method was applied to evaluate the effects of four protein coronas-human serum albumin, high-density lipoproteins, immunoglobulin G, and fibrinogen-as well as their mixture across varying incubation times and concentrations. The results suggest that the physical presence of whole protein coronas surrounding the IgG-AuNPs may assist the biosensing interaction in situ rather than screening it.

Impact of Glycosylation of Apolipoprotein D on Its Interaction with Gold Nanoparticles: Insights from Molecular Dynamics Simulations

Efficient delivery of nanoparticles (NPs) as carriers for biochemical substances is crucial in various biomedical applications. In this study, we systematically investigate the interactions between glycosylated and nonglycosylated forms of Apolipoprotein D (ApoD) with gold nanoparticles (AuNPs) functionalized with different polymer coatings, including polyethylene glycol (PEG) and zwitterionic polymers. Using all-atom molecular dynamics simulations, we demonstrate that glycosylation significantly enhances the adsorption behavior of ApoD on AuNP surfaces, with the extent of this enhancement being dependent on the type (especially the charge property) of the polymer coatings. Notably, while zwitterionic polymers exhibit strong resistance to protein adsorption in their nonglycosylated form, this antifouling capability is diminished when glycosylation is present. Further, our findings reveal that glycosylation not only strengthens the binding energy of proteins but also alters the hydration dynamics at the NP-protein interface. Overall, this study provides a deeper understanding of the role of glycosylation in modulating protein-nanoparticle interactions, which is essential for the design of more effective nanomaterials for precision medicine.

An investigation of the effect of the protein corona on the cellular uptake of nanoliposomes under flow conditions using quartz crystal microgravimetry with dissipation

When nanoparticle delivery systems are immersed in biological fluids, a complex assembly of proteins forms on their surface, creating a protein corona. The protein corona alters the physicochemical properties, toxicity, biodistribution, cellular uptake, and immune response of the nanoparticles, and consequently, their therapeutic efficacy. Currently, there is a lack of in vitro methods to assess the effects of the protein corona on nanoparticle uptake under dynamic flow and assess their binding kinetics in real-time. Here, we introduce quartz crystal microbalance with dissipation (QCM-D) as an in vitro technique, capable of incorporating dynamic flow, to study the effect of the protein corona on the binding of nanoliposome (NLP) formulations to cell surfaces as a first step in their cellular uptake. The interactions of four NLP formulations (low PEGylated, high PEGylated, negatively charged and positively charged NLPs) with A375 melanoma and THP1 cell lines were assessed by QCM-D, before and after the formation of a protein corona. Through real-time recording of the frequency and dissipation shifts (Δf and ΔD, respectively), the QCM-D results provided strong evidence of the role of the protein corona in the cellular interaction of these NLP formulations, with a variation in their adsorption kinetics depending on their initial composition. NLP's attachment to the cell surface was the lowest for PEGylated NLPs (<5%), while the positively charged NLPs showed the highest cellular attachment (≈100%), regardless of the presence of the protein corona or cell type. The effect of the protein corona was more pronounced for the negatively charged NLPs, where a significant reduction in the NLP attachment was observed. To complement the QCM-D data on the NLP attachment and to determine whether the NLP attachment leads to cellular uptake, confocal microscopy and flow cytometry were used to confirm NLP uptake by A375 and THP1 cells. Proteomic analysis revealed a differential composition of the protein corona on the various NLPs with possible implications for their sequestration and cellular uptake. Collectively, the findings suggest that QCM-D can be an important tool to study the binding of NLP formulations or other nanoparticles with cell membranes under dynamic flow, which very often differs from nanoparticle uptake under static conditions.

Lactoferrin as a Versatile Agent in Nanoparticle Applications: From Therapeutics to Agriculture

Nanoparticles (NPs) have emerged as a potent choice for various applications, from drug delivery to agricultural studies, serving as an alternative and promising methodology for future advancements. They have been widely explored in delivery systems, demonstrating immense promise and high efficiency for the delivery of numerous biomolecules such as proteins and anticancer agents, either solely or modified with other compounds to enhance their capabilities. In addition, the utilization of NPs extends to antimicrobial studies, where they are used to develop novel antibacterial, antifungal, and antiviral formulations with advanced characteristics. Lactoferrin (Lf) is a glycoprotein recognized for its significant multifunctional properties, such as antimicrobial, antioxidant, anti-inflammatory, anticancer, and neuroprotective effects. Its activity has a broad distribution in the human body, with Lf receptors present in multiple regions. Current research shows that Lf is utilized in NP technology as a surface material, encapsulated biomolecule, and even as an NP itself. Due to the abundance of Lf receptors in various regions, Lf can be employed as a surface material in NPs for targeted delivery strategies, particularly in crossing the BBB and targeting specific cancers. Furthermore, Lf can be synthesized in an NP structure, positioning it as a strong candidate in future NP-related applications. In this article, we explore the highlighted and underexplored areas of Lf applications in NPs research.

Surface saturation of drug-loaded hollow manganese dioxide nanoparticles with human serum albumin for treating rheumatoid arthritis

Rheumatoid arthritis (RA) is a chronic inflammatory joint disease accompanied by energy depletion and accumulation of reactive oxygen species (ROS). Inorganic nanoparticles (NPs) offer great promise for the treatment of RA because they mostly have functions beyond being drug carriers. However, conventional nanomaterials become coated with a protein corona (PC) or lose their cargo prematurely in vivo, reducing their therapeutic efficacy. To avoid these problems, we loaded methotrexate (MTX) into hollow structured manganese dioxide nanoparticles (H-MnO2 NPs), then coated them with a 'pseudo-corona' of human serum albumin (HSA) at physiological concentrations to obtain HSA-MnO2@MTX NPs. Efficacy of MTX, MnO2@MTX, and HSA-MnO2@MTX NPs was compared in vitro and in vivo. Compared to MnO2@MTX, HSA-coated NPs were taken up better by lipopolysaccharide-activated RAW264.7 and were more effective at lowering levels of pro-inflammatory cytokines and preventing ROS accumulation. HSA-MnO2@MTX NPs were also more efficient at blocking the proliferation and migration of fibroblast-like synoviocytes from rats with collagen-induced arthritis. In this rat model, HSA-MnO2@MTX NPs showed better biodistribution than other treatments, specifically targeting the ankle joint. Furthermore, HSA-MnO2@MTX NPs reduced swelling in the paw, regulated pro-inflammatory cytokine production, and limited cartilage degradation and signs of inflammation. These results establish the therapeutic potential of HSA-MnO2@MTX NPs against RA.

The "gut" corona at the surface of nanoparticles is dependent on exposure to bile salts and phospholipids

HYPOTHESIS

The formation of a biomolecular corona on nanoparticle surfaces significantly influences their biological behaviour, particularly in drug delivery applications. Despite the prevalence of ingestion of particles (e.g, during oral drug delivery), our understanding of corona formation within the gastrointestinal (GI) tract remains limited, especially for non-protein components. The hypothesis of this work is that the exposure of nanoparticles to bile components will form a "corona" structure and protein corona will represent proteomes different from the original bile fluid. Two major aspects of biomolecular corona formed in GI fluid (hereby termed "gut corona), which ultimately dictate the fate of particle-based carriers, include the composition and the surface structure of nanoparticle-corona complex.

EXPERIMENTS

The structure and composition of the biomolecular corona formed on model SiO2 nanoparticles within simulated and extracted bile fluids were determined using small-angle scattering, quantification assays, and liquid chromatography with tandem mass spectrometry (LC-MS/MS) techniques.

FINDINGS

The formation of raspberry-like structures was identified, with bile micelles adopting ellipsoidal shapes around the nanoparticles, as opposed to a surface covered with a uniform corona (i.e., core-shell structure). Assay quantification and proteomics experiments revealed a notable increase in the ratio of protein to bile salt within the corona compared to the original bile fluid. The composition of the proteome differed between the bovine bile and the protein corona with only 34 proteins associated with the nanoparticles from the top 100 identified in bovine bile. Despite the differences in protein types identified between bovine bile and gut corona, the proportions of protein between different functional classes, such as enzymes and structural proteins, show little variation. This work elucidates the intricate interactions between nanoparticles and gut molecules, offering insights crucial for designing nanoparticle formulations for optimized oral drug delivery and understanding nanoparticle behaviour within the GI tract.

Physicochemical and biological characterization of the lipid particles with bovine serum albumin corona

Diacylglycerol-based nanoparticles are promising bioactive delivery systems. However, limited understanding of their interaction with biological entities restricts their clinical use. This study investigated the protein corona formed on medium and long chain diacylglycerol (MLCD)-based solid lipid nanoparticles (NPs) modified by Polyoxethylene stearate (PEG) and compared to glyceryl tristearate (TG) and cetyl palmitate (CP) nanoparticles. Bovine serum albumin (BSA) formed corona with MLCD NPs through hydrophobic interactions and hydrogen bonding, contributing to a decrease in α-helix, an increase in β-sheet and a change in the microenvironment of Tyr residues. Owing to higher lipid hydrophilicity, MLCD NPs showed a much lower affinity for BSA than TG and CP NPs, and the binding constant with BSA was increased for larger NPs. PEG modification and the protein corona reduced the uptake of NPs by macrophages but exerted little influence on B16 cell. Among the NPs with different lipid core, the MLCD NPs showed a lower macrophages cell uptake but higher B16 cell uptake, suggesting a longer circulation time in blood but higher cancer cell internalization. This work shed light on the interactions between MLCD NPs and proteins, which is significant for application as nanocarriers with improved biological efficacy.

Graphene Oxide Quantum Dots-Preactivated Dental Pulp Stem Cells/GelMA Facilitates Mitophagy-Regulated Bone Regeneration

Background

In bone tissue engineering (BTE), cell-laden scaffolds offer a promising strategy for repairing bone defects, particularly when host cell regeneration is insufficient due to age or disease. Exogenous stem cell-based BTE requires bioactive factors to activate these cells. Graphene oxide quantum dots (GOQDs), zero-dimensional derivatives of graphene oxide, have emerged as potential osteogenic nanomedicines. However, constructing biological scaffolds with GOQDs and elucidating their biological mechanisms remain critical challenges.

Methods

We utilized GOQDs with a particle size of 10 nm, characterized by a surface rich in C-O-H and C-O-C functional groups. We developed a gelatin methacryloyl (GelMA) hydrogel incorporated with GOQDs-treated dental pulp stem cells (DPSCs). These constructs were transplanted into rat calvarial bone defects to estimate the effectiveness of GOQDs-induced DPSCs in repairing bone defects while also investigating the molecular mechanism underlying GOQDs-induced osteogenesis in DPSCs.

Results

GOQDs at 5 μg/mL significantly enhanced the osteogenic differentiation of DPSCs without toxicity. The GOQDs-induced DPSCs showed active osteogenic potential in three-dimensional cell culture system. In vivo, transplantation of GOQDs-preactivated DPSCs/GelMA composite effectively facilitated calvarial bone regeneration. Mechanistically, GOQDs stimulated mitophagy flux through the phosphatase-and-tensin homolog-induced putative kinase 1 (PINK1)/Parkin E3 ubiquitin ligase (PRKN) pathway. Notably, inhibiting mitophagy with cyclosporin A prevented the osteogenic activity of GOQDs.

Conclusion

This research presents a well-designed bionic GOQDs/DPSCs/GelMA composite scaffold and demonstrated its ability to promote bone regeneration by enhancing mitophagy. These findings highlight the significant potential of this composite for application in BTE and underscore the crucial role of mitophagy in promoting the osteogenic differentiation of GOQDs-induced stem cells.

Sterile inflammation induced by respirable micro and nano polystyrene particles in the pathogenesis of pulmonary diseases

Sterile inflammation is involved in the lung pathogenesis induced by respirable particles, including micro- and nanoplastics. Their increasing amounts in the ambient and in indoor air pose a risk to human health. In two human cell lines (A549 and THP-1) we assessed the proinflammatory behavior of polystyrene nanoplastics (nPS) and microplastics (mPS) (Ø 0.1 and 1 μm). Reproducing environmental aging, in addition to virgin, the cells were exposed to oxidized nPS/mPS. To study the response of the monocytes to the inflammatory signal transmitted by the A549 through the release of soluble factors (e.g. alarmins and cytokines), THP-1 cells were also exposed to the supernatants of previously nPS/mPS-treated A549. After dynamic-light-scattering (DLS) analysis and protein measurements for the assessment of protein corona in nPS/mPS, real-time PCR and enzyme-linked-immunosorbent (ELISA) assays were performed in exposed cells. The pro-inflammatory effects of v- and ox-nPS/mPS were attested by the imbalance of the Bax/Bcl-2 ratio in A549, which was able to trigger the inflammatory cascade, inhibiting the immunologically silent apoptosis. The involvement of NFkB was confirmed by the overexpression of p65 after exposure to ox-nPS and v- and ox-mPS. The fast and higher levels of IL-1β, only in THP-1 cells, underlined the NLPR3 inflammasome activation.

Serum-derived protein coronas affect nanoparticle interactions with brain cells

Neuronanomedicine is an emerging field bridging the gap between neuromedicine and novel nanotherapeutics. Despite promise, clinical translation of neuronanomedicine remains elusive, possibly due to a dearth of information regarding the effect of the protein corona on these neuronanomedicines. The protein corona, a layer of proteins adsorbed to nanoparticles following exposure to biological fluids, ultimately determines the fate of nanoparticles in biological systems, dictating nanoparticle-cell interactions. To date, few studies have investigated the effect of the protein corona on interactions with brain-derived cells, an important consideration for the development of neuronanomedicines. Here, two polymeric nanoparticles, poly(lactic-co-glycolic acid) (PLGA) and PLGA-polyethylene glycol (PLGA-PEG), were used to obtain serum-derived protein coronas. Protein corona characterization and liquid chromatography mass spectrometry analysis revealed distinct differences in biophysical properties and protein composition. PLGA protein coronas contained high abundance of globins (60%) and apolipoproteins (21%), while PLGA-PEG protein coronas contained fewer globins (42%) and high abundance of protease inhibitors (28%). Corona coated PLGA nanoparticles were readily internalized into microglia and neuronal cells, but not into astrocytes. Internalization of nanoparticles was associated with pro-inflammatory cytokine release and decreased neuronal cell viability, however, viability was rescued in cells treated with corona coated nanoparticles. These results showcase the importance of the protein corona in mediating nanoparticle-cell interactions.

Topical Delivery of Dual Loaded Nano-Transfersomes Mediated Chemo-Photodynamic Therapy against Melanoma via Inducing Cell Cycle Arrest and Apoptosis

Melanoma is a malignant skin cancer associated with high mortality rates and drug resistance, posing a significant threat to human health. The combination of chemotherapy and photodynamic therapy (PDT) represents a promising strategy to enhance antitumor efficacy through synergistic anti-cancer effects. Topical delivery of chemotherapeutic drugs and photosensitizers (PS) offers a non-invasive and safe way to treat melanoma. However, the effectiveness of these treatments is often hindered by challenges such as limited skin permeability and instability of the PS. In this study, transfersomes (TFS) were designed to facilitate transdermal delivery of the chemotherapeutic drug 5-Fluorouracil (5-FU) and the PS Imperatorin (IMP) for combined chemo-photodynamic therapy for melanoma. The cytotoxic and phototoxic effects of TFS-mediated PDT (TFS-UVA) were investigated in A375 cells and nude mice. The study also demonstrated that TFS-UVA generated intracellular ROS, induced G2/ M phase cell cycle arrest, and promoted cell apoptosis. In conclusion, this study indicated that 5-FU/ IMP-TFS serves as an effective transdermal therapeutic strategy for chemo-PDT in treating melanoma.

Transepithelial transport of nanoparticles in oral drug delivery: From the perspective of surface and holistic property modulation

Despite the promising prospects of nanoparticles in oral drug delivery, the process of oral administration involves a complex transportation pathway that includes cellular uptake, intracellular trafficking, and exocytosis by intestinal epithelial cells, which are necessary steps for nanoparticles to enter the bloodstream and exert therapeutic effects. Current researchers have identified several crucial factors that regulate the interaction between nanoparticles and intestinal epithelial cells, including surface properties such as ligand modification, surface charge, hydrophilicity/hydrophobicity, intestinal protein corona formation, as well as holistic properties like particle size, shape, and rigidity. Understanding these properties is essential for enhancing transepithelial transport efficiency and designing effective oral drug delivery systems. Therefore, this review provides a comprehensive overview of the surface and holistic properties that influence the transepithelial transport of nanoparticles, elucidating the underlying principles governing their impact on transepithelial transport. The review also outlines the chosen of parameters to be considered for the subsequent design of oral drug delivery systems.

Hemostatic Dressing Immobilized with ε-poly-L-lysine and Alginate Coated Mesoporous Bioactive Glass Prevents Blood Permeation by Pseudo-Dewetting Behavior

The integration of hemostats with cotton fabrics is recognized as an effective approach to improve the hemostatic performance of dressings. However, concerns regarding the uncontrollable absorption of blood by hydrophilic dressings and the risk of distal thrombosis from shed hemostatic agents are increasingly scrutinized. To address these issues, this work develops an advanced dressing (AQG) with immobilized nano-scale mesoporous bioactive glass (MBG) to safely and durably augment hemostasis. The doubly immobilized MBGs, pre-coated with ε-poly-L-lysine and alginate, demonstrate less than 1% detachment after ultrasonic washing. Notably, this MBG layer significantly promotes the adhesion, aggregation, and activation of red blood cells and platelets, adhered five times more red blood cells and 29 times more platelets than raw dressing, respectively. Specially, with the rapid formation of protein corona and amplification of thrombin, dense fibrin network is built on MBG layer and then blocked blood permeation transversely and longitudinally, showing an autophobic pseudo-dewetting behavior and allowing AQG to concentrate blood in situ and culminate in faster hemostasis with lower blood loss. Furthermore, the potent antibacterial properties of AQG extend its potential for broader application in daily care and clinical setting.

Nanoparticle Targeting Strategies for Lipid and Polymer-Based Gene Delivery to Immune Cells In Vivo

Lipid nanoparticles and polymeric nanoparticles are promising biomaterial platforms for robust intracellular DNA and mRNA delivery, highlighted by the widespread use of nanoparticle- (NP) based mRNA vaccines to help end the COVID-19 pandemic. Recent research has sought to adapt this nanotechnology to transfect and engineer immune cells in vivo. The immune system is an especially appealing target due to its involvement in many different diseases, and ex vivo-engineered immune cell therapies like chimeric antigen receptor (CAR) T therapy have already demonstrated remarkable clinical success in certain blood cancers. Although gene delivery can potentially address some of the cost and manufacturing concerns associated with current autologous immune cell therapies, transfecting immune cells in vivo is challenging. Not only is extrahepatic NP delivery to lymphoid organs difficult, but immune cells like T cells have demonstrated particular resistance to transfection. Despite these challenges, the modular nature of NPs allows researchers to examine critical structure-function relationships between a particle's properties and its ability to specifically engineer immune cells in vivo. Herein, several nanomaterial components are outlined, including targeting ligands, nucleic acid cargo, chemical properties, physical properties, and the route of administration to specifically target NPs to immune cells for optimal in vivo transfection.

The menace of severe adverse events and deaths associated with viral gene therapy and its potential solution

Over the past decade, in vivo gene replacement therapy has significantly advanced, resulting in market approval of numerous therapeutics predominantly relying on adeno-associated viral vectors (AAV). While viral vectors have undeniably addressed several critical healthcare challenges, their clinical application has unveiled a range of limitations and safety concerns. This review highlights the emerging challenges in the field of gene therapy. At first, we discuss both the role of biological barriers in viral gene therapy with a focus on AAVs, and review current landscape of in vivo human gene therapy. We delineate advantages and disadvantages of AAVs as gene delivery vehicles, mostly from the safety perspective (hepatotoxicity, cardiotoxicity, neurotoxicity, inflammatory responses etc.), and outline the mechanisms of adverse events in response to AAV. Contribution of every aspect of AAV vectors (genomic structure, capsid proteins) and host responses to injected AAV is considered and substantiated by basic, translational and clinical studies. The updated evaluation of recent AAV clinical trials and current medical experience clearly shows the risks of AAVs that sometimes overshadow the hopes for curing a hereditary disease. At last, a set of established and new molecular and nanotechnology tools and approaches are provided as potential solutions for mitigating or eliminating side effects. The increasing number of severe adverse reactions and, sadly deaths, demands decisive actions to resolve the issue of immune responses and extremely high doses of viral vectors used for gene therapy. In response to these challenges, various strategies are under development, including approaches aimed at augmenting characteristics of viral vectors and others focused on creating secure and efficacious non-viral vectors. This comprehensive review offers an overarching perspective on the present state of gene therapy utilizing both viral and non-viral vectors.

Polyester nanoparticles delivering chemotherapeutics: Learning from the past and looking to the future to enhance their clinical impact in tumor therapy

Polymeric nanoparticles (NPs), specifically those comprised of biodegradable and biocompatible polyesters, have been heralded as a game-changing drug delivery platform. In fact, poly(α-hydroxy acids) such as polylactide (PLA), poly(lactide-co-glycolide) (PLGA), and poly(ε-caprolactone) (PCL) have been heavily researched in the past three decades as the material basis of polymeric NPs for drug delivery applications. As materials, these polymers have found success in resorbable sutures, biodegradable implants, and even monolithic, biodegradable platforms for sustained release of therapeutics (e.g., proteins and small molecules) and diagnostics. Few fields have gained more attention in drug delivery through polymeric NPs than cancer therapy. However, the clinical translational of polymeric nanomedicines for treating solid tumors has not been congruent with the fervor or funding in this particular field of research. Here, we attempt to provide a comprehensive snapshot of polyester NPs in the context of chemotherapeutic delivery. This includes a preliminary exploration of the polymeric nanomedicine in the cancer research space. We examine the various processes for producing polyester NPs, including methods for surface-functionalization, and related challenges. After a detailed overview of the multiple factors involved with the delivery of NPs to solid tumors, the crosstalk between particle design and interactions with biological systems is discussed. Finally, we report state-of-the-art approaches toward effective delivery of NPs to tumors, aiming at identifying new research areas and re-evaluating the reasons why some research avenues have underdelivered. We hope our effort will contribute to a better understanding of the gap to fill and delineate the future research work needed to bring polyester-based NPs closer to clinical application. This article is categorized under: Therapeutic Approaches and Drug Discovery > Nanomedicine for Oncologic Disease Nanotechnology Approaches to Biology > Nanoscale Systems in Biology Therapeutic Approaches and Drug Discovery > Emerging Technologies.

Brain-targeted drug delivery by in vivo functionalized liposome with stable D-peptide ligand

Brain-targeted drug delivery poses a great challenge due to the blood-brain barrier (BBB). In a previous study, we have developed a peptide-modified stealth liposome (SP-sLip) to enhance BBB penetration via the adsorption of apolipoproteins in plasma. SP is an 11-amino acid peptide derived from 25 to 35 of the Amyloid β peptide (Aβ1-42), which is a nature ligand of apolipoproteins. Although freshly prepared SP-sLip exhibited efficient brain targeting performance, it occured self-aggregation and instability in storage. In this study, we developed a D-peptide ligand according to the reverse sequence of SP with D-amino acids, known as DSP, to improve the stability in storage. Notably, DSP exhibited a reduced tendency for self-aggregation and improved stability in comparison to the SP peptide. Furthermore, compared to SP-sLip, DSP-modified sLip (DSP-sLip) demonstrated enhanced stability (>2 weeks), prolonged blood circulation (AUC increased 44.4%), reduced liver and spleen accumulation (reduced by 2.23 times and 1.86 times) with comparable brain-targeting efficiency. Similar to SP-sLip, DSP-sLip selectively adsorbed apolipoprotein A1, E, and J in the blood to form functionalized protein corona, thus crossing BBB via apolipoprotein receptor-mediated transcytosis. These findings underscored the importance of ligand stability in the in vitro and in vivo performance of brain-targeted liposomes, therefore paving the way for the design and optimization of efficient and stable nanocarriers.

Temperature Self-Limited Intelligent Thermo-chemotherapeutic Lipid Nanosystem for P-gp Reversal Time Window Matched Pulse Treatment of MDR Tumor

Mild photothermal therapy (PTT) shows the potential for chemosensitization by tumor-localized P-glycoprotein (P-gp) modulation. However, conventional mild PTT struggles with real-time uniform temperature control, obscuring the temperature-performance relationship and resulting in thermal damage. Besides, the time-performance relationship and the underlying mechanism of mild PTT-mediated P-gp reversal remains elusive. Herein, we developed a temperature self-limiting lipid nanosystem (RFE@PD) that integrated a reversible organic heat generator (metal-phenolic complexes) and metal chelator (deferiprone, DFP) encapsulated phase change material. Upon NIR irradiation, RFE@PD released DFP for blocking ligand-metal charge transfer to self-limit temperature below 45 °C, and rapidly reduced P-gp within 3 h via Ubiquitin-proteasome degradation. Consequently, the DOX·HCl-loaded thermo-chemotherapeutic lipid nanosystem (RFE@PD-DOX) led to dramatically improved drug accumulation and 5-fold chemosensitization in MCF-7/ADR tumor models by synchronizing P-gp reversal and drug pulse liberation, achieving a tumor inhibition ratio of 82.42%. This lipid nanosystem integrated with "intrinsic temperature-control" and "temperature-responsive pulse release" casts new light on MDR tumor therapy.

Spiky tubular nanoparticles with low protein corona can realize efficient and non-destructive penetration through endothelial barrier

Upon intravascular applications, i.e., cancer treatment, nanoparticles (NPs) are required to deliver through blood circulation, sustain serum protein interactions, before they penetrate the blood vessels and reach targeted sites for payload drug release. For a delivery process as such, it is elusive and difficult to comprehend the morphological change of NP surface and evaluate associated effects on its targeted delivery. Herein, we used silica NPs with different surface modifications to demonstrate the morphological impact of NPs during the application of the NP-blood protein interaction, vascular endothelial cell penetration, subsequent targeted delivery and photodynamic therapy efficacy, and pursue high drug-load NPs with surface designs. Compared to solid and mesoporous NPs, we found the spiky tubular NPs reserved the NPs' antifouling properties (or shedding of "protein corona"), promoted better endothelial penetration and less destruction in vitro and in vivo. Such effects could be attributed to their spiky surface structures, which can limit the NP-protein interaction area and promote the NP-protein steric hindrance. Further in molecular simulations, we determined that the spiky tubular morphological modification on NPs enhanced the interaction free energy and lowered the amino acids number and the subsequent frequency in contacting with VE-cadherin of vascular endothelia. As a result, the spiky tubular NPs demonstrated its advantages in mitigating damages to VE-cadherin stability and endothelial cell integrity. Exploiting such spiky tubular surface modification, we can improve the NP delivery efficiency and prohibit the leakiness of vascular endothelia, helping address challenges faced by tumor migration in nanomedicine applications for cancer therapy.

Small Scale, Big Impact: Nanotechnology-Enhanced Drug Delivery for Brain Diseases

Central nervous system (CNS) diseases, ranging from brain cancers to neurodegenerative disorders like dementia and acute conditions such as strokes, have been heavily burdening healthcare and have a direct impact on patient quality of life. A significant hurdle in developing effective treatments is the presence of the blood-brain barrier (BBB), a highly selective barrier that prevents most drugs from reaching the brain. The tight junctions and adherens junctions between the endothelial cells and various receptors expressed on the cells make the BBB form a nonfenestrated and highly selective structure that is crucial for brain homeostasis but complicates drug delivery. Nanotechnology offers a novel pathway to circumvent this barrier, with nanoparticles engineered to ferry drugs across the BBB, protect drugs from degradation, and deliver medications to the designated area. After years of development, nanoparticle optimization, including sizes, shapes, surface modifications, and targeting ligands, can enable nanomaterials tailored to specific brain drug delivery settings. Moreover, smart nano drug delivery systems can respond to endogenous and exogenous stimuli that control subsequent drug release. Here, we address the importance of the BBB in brain disease treatment, summarize different delivery routes for brain drug delivery, discuss the cutting-edge nanotechnology-based strategies for brain drug delivery, and further offer valuable insights into how these innovations in nanoparticle technology could revolutionize the treatment of CNS diseases, presenting a promising avenue for noninvasive, targeted therapeutic interventions.

Cancer Nanovaccines: Nanomaterials and Clinical Perspectives

Cancer nanovaccines represent a promising frontier in cancer immunotherapy, utilizing nanotechnology to augment traditional vaccine efficacy. This review comprehensively examines the current state-of-the-art in cancer nanovaccine development, elucidating innovative strategies and technologies employed in their design. It explores both preclinical and clinical advancements, emphasizing key studies demonstrating their potential to elicit robust anti-tumor immune responses. The study encompasses various facets, including integrating biomaterial-based nanocarriers for antigen delivery, adjuvant selection, and the impact of nanoscale properties on vaccine performance. Detailed insights into the complex interplay between the tumor microenvironment and nanovaccine responses are provided, highlighting challenges and opportunities in optimizing therapeutic outcomes. Additionally, the study presents a thorough analysis of ongoing clinical trials, presenting a snapshot of the current clinical landscape. By curating the latest scientific findings and clinical developments, this study aims to serve as a comprehensive resource for researchers and clinicians engaged in advancing cancer immunotherapy. Integrating nanotechnology into vaccine design holds immense promise for revolutionizing cancer treatment paradigms, and this review provides a timely update on the evolving landscape of cancer nanovaccines.

Deposition of Human-Serum-Albumin-Functionalized Spheroidal Particles on Abiotic Surfaces: Reference Kinetic Results for Bioparticles

Human serum albumin (HSA) corona formation on polymer microparticles of a spheroidal shape was studied using dynamic light scattering and Laser Doppler Velocimetry (LDV). Physicochemical characteristics of the albumin comprising the zeta potential and the isoelectric point were determined as a function of pH for various ionic strengths. Analogous characteristics of the polymer particles were analyzed. The adsorption of albumin on the particles was in situ monitored by LDV. The stability of the HSA-functionalized particle suspensions under various pHs and their electrokinetic properties were also determined. The deposition kinetics of the particles on mica, silica and gold sensors were investigated by optical microscopy, AFM and quartz microbalance (QCM) under diffusion and flow conditions. The obtained results were interpreted in terms of the random sequential adsorption model that allowed to estimate the range of applicability of QCM for determining the deposition kinetics of viruses and bacteria at abiotic surfaces.

Looking back, moving forward: protein corona of lipid nanoparticles

Lipid nanoparticles (LNPs) are commonly employed for drug delivery owing to their considerable drug-loading capacity, low toxicity, and excellent biocompatibility. Nevertheless, the formation of protein corona (PC) on their surfaces significantly influences the drug's in vivo fate (such as absorption, distribution, metabolism, and elimination) upon administration. PC denotes the phenomenon wherein one or multiple strata of proteins adhere to the external interface of nanoparticles (NPs) or microparticles within the biological milieu, encompassing ex vivo fluids (e.g., serum-containing culture media) and in vivo fluids (such as blood and tissue fluids). Hence, it is essential to claim the PC formation behaviors and mechanisms on the surface of LNPs. This overview provided a comprehensive examination of crucial aspects related to such issues, encompassing time evolution, controllability, and their subsequent impacts on LNPs. Classical studies of PC generation on the surface of LNPs were additionally integrated, and its decisive role in shaping the in vivo fate of LNPs was explored. The mechanisms underlying PC formation, including the adsorption theory and alteration theory, were introduced to delve into the formation process. Subsequently, the existing experimental outcomes were synthesized to offer insights into the research and application facets of PC, and it was concluded that the manipulation of PC held substantial promise in the realm of targeted delivery.

Glycan-based scaffolds and nanoparticles as drug delivery system in cancer therapy

Glycan-based scaffolds are unique in their high specificity, versatility, low immunogenicity, and ability to mimic natural carbohydrates, making them attractive candidates for use in cancer treatment. These scaffolds are made up of glycans, which are biopolymers with well biocompatibility in the human body that can be used for drug delivery. The versatility of glycan-based scaffolds allows for the modulation of drug activity and targeted delivery to specific cells or tissues, which increases the potency of drugs and reduces side effects. Despite their promise, there are still technical challenges in the design and production of glycan-based scaffolds, as well as limitations in their therapeutic efficacy and specificity.

A Review for Uncovering the "Protein-Nanoparticle Alliance": Implications of the Protein Corona for Biomedical Applications

Understanding both the physicochemical and biological interactions of nanoparticles is mandatory for the biomedical application of nanomaterials. By binding proteins, nanoparticles acquire new surface identities in biological fluids, the protein corona. Various studies have revealed the dynamic structure and nano-bio interactions of the protein corona. The binding of proteins not only imparts new surface identities to nanoparticles in biological fluids but also significantly influences their bioactivity, stability, and targeting specificity. Interestingly, recent endeavors have been undertaken to harness the potential of the protein corona instead of evading its presence. Exploitation of this 'protein-nanoparticle alliance' has significant potential to change the field of nanomedicine. Here, we present a thorough examination of the latest research on protein corona, encompassing its formation, dynamics, recent developments, and diverse bioapplications. Furthermore, we also aim to explore the interactions at the nano-bio interface, paving the way for innovative strategies to advance the application potential of the protein corona. By addressing challenges and promises in controlling protein corona formation, this review provides insights into the evolving landscape of the 'protein-nanoparticle alliance' and highlights emerging.

Functional nanomaterials as photosensitizers or delivery systems for antibacterial photodynamic therapy

Bacterial infection is a global health problem that closely related to various diseases threatening human life. Although antibiotic therapy has been the mainstream treatment method for various bacterial infectious diseases for decades, the increasing emergence of bacterial drug resistance has brought enormous challenges to the application of antibiotics. Therefore, developing novel antibacterial strategies is of great importance. By producing reactive oxygen species (ROS) with photosensitizers (PSs) under light irradiation, antibacterial photodynamic therapy (aPDT) has emerged as a non-invasive and promising approach for treating bacterial infections without causing drug resistance. However, the insufficient therapeutic penetration, poor hydrophilicity, and poor biocompatibility of traditional PSs greatly limit the efficacy of aPDT. Recently, studies have found that nanomaterials with characteristics of favorable photocatalytic activity, surface plasmonic resonance, easy modification, and high drug loading capacity can improve the therapeutic efficacy of aPDT. In this review, we aim to provide a comprehensive understanding of the mechanism of nanomaterials-mediated aPDT and summarize the representative nanomaterials in aPDT, either as PSs or carriers for PSs. In addition, the combination of advanced nanomaterials-mediated aPDT with other therapies, including targeted therapy, gas therapy, and multidrug resistance (MDR) therapy, is reviewed. Also, the concerns and possible solutions of nanomaterials-based aPDT are discussed. Overall, this review may provide theoretical basis and inspiration for the development of nanomaterials-based aPDT.

Recent Advancements and Unexplored Biomedical Applications of Green Synthesized Ag and Au Nanoparticles: A Review

Green synthesis of silver (Ag) and gold (Au) nanoparticles (NPs) has acquired huge popularity owing to their potential applications in various fields. A large number of research articles exist in the literature describing the green synthesis of Ag and Au NPs for biomedical applications. However, these findings are scattered, making it time-consuming for researchers to locate promising advancements in Ag and Au NPs synthesis and their unexplored biomedical applications. Unlike other review articles, this systematic study not only highlights recent advancements in the green synthesis of Ag and Au NPs but also explores their potential unexplored biomedical applications. The article discusses the various synthesis approaches for the green synthesis of Ag and Au NPs highlighting the emerging developments and novel strategies. Then, the article reviews the important biomedical applications of green synthesized Ag and Au NPs by critically evaluating the expected advantages. To expose future research direction in the field, the article describes the unexplored biomedical applications of the NPs. Finally, the articles discuss the challenges and limitations in the green synthesis of Ag and Au NPs and their biomedical applications. This article will serve as a valuable reference for researchers, working on green synthesis of Ag and Au NPs for biomedical applications.

Overcoming the Low-Stability Bottleneck in the Clinical Translation of Liposomal Pressurized Metered-Dose Inhalers: A Shell Stabilization Strategy Inspired by Biomineralization

Currently, several types of inhalable liposomes have been developed. Among them, liposomal pressurized metered-dose inhalers (pMDIs) have gained much attention due to their cost-effectiveness, patient compliance, and accurate dosages. However, the clinical application of liposomal pMDIs has been hindered by the low stability, i.e., the tendency of the aggregation of the liposome lipid bilayer in hydrophobic propellant medium and brittleness under high mechanical forces. Biomineralization is an evolutionary mechanism that organisms use to resist harsh external environments in nature, providing mechanical support and protection effects. Inspired by such a concept, this paper proposes a shell stabilization strategy (SSS) to solve the problem of the low stability of liposomal pMDIs. Depending on the shell material used, the SSS can be classified into biomineralization (biomineralized using calcium, silicon, manganese, titanium, gadolinium, etc.) biomineralization-like (composite with protein), and layer-by-layer (LbL) assembly (multiple shells structured with diverse materials). This work evaluated the potential of this strategy by reviewing studies on the formation of shells deposited on liposomes or similar structures. It also covered useful synthesis strategies and active molecules/functional groups for modification. We aimed to put forward new insights to promote the stability of liposomal pMDIs and shed some light on the clinical translation of relevant products.

Genome editing of PAR2 through targeted delivery of CRISPR-Cas9 system for alleviating acute lung inflammation via ERK/NLRP3/IL-1β and NO/iNOS signalling

Excessive and uncontrollable inflammatory responses in alveoli can dramatically exacerbate pulmonary disease progressions through vigorous cytokine releases, immune cell infiltration and protease-driven tissue damages. It is an urgent need to explore potential drug strategies for mitigating lung inflammation. Protease-activated receptor 2 (PAR2) as a vital molecular target principally participates in various inflammatory diseases via intracellular signal transduction. However, it has been rarely reported about the role of PAR2 in lung inflammation. This study applied CRISPR-Cas9 system encoding Cas9 and sgRNA (pCas9-PAR2) for PAR2 knockout and fabricated an anionic human serum albumin-based nanoparticles to deliver pCas9-PAR2 with superior inflammation-targeting efficiency and stability (TAP/pCas9-PAR2). TAP/pCas9-PAR2 robustly facilitated pCas9-PAR2 to enter and transfect inflammatory cells, eliciting precise gene editing of PAR2 in vitro and in vivo. Importantly, PAR2 deficiency by TAP/pCas9-PAR2 effectively and safely promoted macrophage polarization, suppressed pro-inflammatory cytokine releases and alleviated acute lung inflammation, uncovering a novel value of PAR2. It also revealed that PAR2-mediated pulmonary inflammation prevented by TAP/pCas9-PAR2 was mainly dependent on ERK-mediated NLRP3/IL-1β and NO/iNOS signalling. Therefore, this work indicated PAR2 as a novel target for lung inflammation and provided a potential nanodrug strategy for PAR2 deficiency in treating inflammatory diseases.

Charge-Reversible Nanoparticles: Advanced Delivery Systems for Therapy and Diagnosis

The past two decades have witnessed a rapid progress in the development of surface charge-reversible nanoparticles (NPs) for drug delivery and diagnosis. These NPs are able to elegantly address the polycation dilemma. Converting their surface charge from negative/neutral to positive at the target site, they can substantially improve delivery of drugs and diagnostic agents. By specific stimuli like a shift in pH and redox potential, enzymes, or exogenous stimuli such as light or heat, charge reversal of NP surface can be achieved at the target site. The activated positive surface charge enhances the adhesion of NPs to target cells and facilitates cellular uptake, endosomal escape, and mitochondrial targeting. Because of these properties, the efficacy of incorporated drugs as well as the sensitivity of diagnostic agents can be essentially enhanced. Furthermore, charge-reversible NPs are shown to overcome the biofilm formed by pathogenic bacteria and to shuttle antibiotics directly to the cell membrane of these microorganisms. In this review, the up-to-date design of charge-reversible NPs and their emerging applications in drug delivery and diagnosis are highlighted.

Intratumor delivery of amino-modified graphene oxide as a multifunctional photothermal agent for efficient antitumor phototherapy

Due to the high selectivity and non-invasive property, phototherapy has attracted increasing attention in the treatment of cancer. Targeted delivery and retention of photoactive agents in tumor tissue is of great significance and importance for safe and efficient phototherapy. Herein, we report a multifunctional nanomaterial photothermal agent, namely amino-modified graphene oxide (AGO) for anti-oral cancer photothermal therapy (PTT). Compared to the parental graphene oxide (GO) which has a negative charge and weak photothermal effect, AGO possesses a positive charge (∼+50 mV) and the significantly enhanced photothermal effect. Positive charge allows AGO to efficiently interact with tumor cells and retain in tumor tissue after intratumor injection. The enhanced photothermal effect allows AGO to achieve the tunable and efficient PTT. In vitro results show that AGO (15 μg/mL) reduces the viability of HSC-3 cells (oral squamous cell carcinoma cell line) to 5% under near infrared (NIR) irradiation (temperature increased to 58.4 °C). In vivo antitumor study shows that intratumor delivery of AGO (200 μg/mouse) has no inhibition effects on tumor growth (454% of initial tumor size) without NIR. With a single dose of NIR irradiation, however, AGO significantly reduces the tumor size to 25% of initial size in 1 of 4 mice, and even induces the complete tumor ablation in 3 of 4 mice. Furthermore, the injected AGO falls off along with the scab after PTT. Our findings indicate that AGO is a potential nano-photothermal agent for tunable, convenient and efficient anticancer PTT.