Antimicrobial, Oxidant, Cytotoxic, and Eco-Safety Properties of Sol-Gel-Prepared Silica-Copper Nanocomposite Materials.

The present work is devoted to the biological effects of sol-gel-derived silica (Si)-copper (Cu) nanomaterials. Tetraethyl orthosilane (TEOS) was used as a silica precursor; copper was introduced as a solution in ethanol with Cu(OH). The obtained samples were denoted as Si/Cu (gel) and Si/Cu/500 (500 °C heat-treated).

Neutrophils shape the therapeutic efficacy of sirtuin 1 activity modulators in murine influenza virus infection.

Sirtuin 1 (Sirt1), a class III histone deacetylase, is a key regulator of gene expression in various immune cell types, including neutrophils, during infection and acute inflammation. Herein, we studied the effect of the Sirt1 activator (SRT2183) and inhibitor (EX527) on the neutrophil pools in the bronchoalveolar lavage fluid (BAL), lung, blood and bone marrow (BM) in mild and severe influenza A virus (IAV) infection. We defined the correlation between parameters characteristic for neutrophil migration, their functional state and the infection-induced lung injury.

Antimicrobial and Antiherpetic Properties of Nanoencapsulated Extract.

This study aims to gain insights into the antimicrobial and antiherpetic activity of hyperforin-rich L. (HP) extract using nanostructured lipid carriers (NLCs) as delivery platforms. : Two established NLC specimens, comprising glyceryl behenate and almond oil or borage oil, and their extract-loaded counterparts (HP-NLCs) were utilized.

Lactobacilli-Derived Postmetabolites Are Broad-Spectrum Inhibitors of Herpes Viruses In Vitro.

Herpes viruses are highly contagious agents affecting all classes of vertebrates, thus causing serious health, social, and economic losses. Within the One Health concept, novel therapeutics are extensively studied for both veterinary and human control and management of the infection, but the optimal strategy has not been invented yet. Lactic acid bacteria are key components of the microbiome that are known to play a protective role against pathogens as one of the proposed mechanisms involves compounds released from their metabolic activity.

Anti-Coronavirus Activity of Chitosan-Stabilized Liposomal Nanocarriers Loaded with Natural Extracts from Bulgarian Flora.

Disease's severity, mortality rates, and common failures to achieve clinical improvement during the unprecedented COVID-19 pandemic exposed the emergency need for new antiviral therapeutics with higher efficacy and fewer adverse effects. This study explores the potential to encapsulate multi-component plant extracts in liposomes as optimized delivery systems and to verify if they exert inhibitory effects against human seasonal betacoronavirus OC43 (HCoV-OC43) in vitro. The selection of , , , , and L.

In Situ Gelling Behavior and Biopharmaceutical Characterization of Nano-Silver-Loaded Poloxamer Matrices Designed for Nasal Drug Delivery.

A combination of Poloxamer 407 (P407) and hydroxypropyl methylcellulose (HPMC) hydrosols is proposed as an in situ thermo-gelling vehicle for the nasal drug delivery of chlorhexidine-silver nanoparticles conjugates (SN-CX). Optimization of the formulation was carried out by applying varying ratios of P407 and HPMC in the presence and absence of SN-CX so that gelation would occur in the temperature range of the nasal cavity (30-34 °C). Mechanisms for the observed gelation phenomena were suggested based on viscosimetry, texture analysis, and dynamic light scattering.

Chlorhexidine-Silver Nanoparticle Conjugation Leading to Antimicrobial Synergism but Enhanced Cytotoxicity.

This study explored the potential synergism within chlorhexidine-silver nanoparticle conjugates against Influenza type A, , , and . Silver nanoparticles (SN) were obtained by the reduction of silver ions with green tea total phenolic extract and conjugated with chlorhexidine (Cx). The particles were characterized by UV-Vis and FTIR spectroscopies, dynamic light scattering, X-ray diffraction, and transmission electron microscopy.

Protective and Therapeutic Capacities of Lactic Acid Bacteria Postmetabolites against Koi Herpesvirus Infection In Vitro.

Background: The accumulation of data on beneficial biological effects of probiotics and their metabolic products favors their potential use in the prevention and treatment of various malaises.

Methods: Nine postmetabolites from Lactic acid bacteria (LAB) of human or dairy origin and their antiviral activity were studied using the cytopathic effect inhibition test. The virucidal capacity, their influence on the adsorption stage of Koi herpes virus (KHV) and their preventive role against subsequent viral challenge on intact Common carp brain (CCB) cells were also determined by titration assay.

Anti-herpes virus activity of postbiotics.

Background: Recently various lactic acid bacteria (LAB) and their post-metabolites have shown many positive effects on human and animal welfare. They appear to be beneficial in different disorders and pathological conditions, including in a broad-spectrum of infectious diseases.

Aim: To estimate the anti-herpes simplex activity of 11 postbiotic samples (lysates or cell-free supernatants - CFS) produced during the fermentation of six candidate-probiotic strains isolated from Bulgarian fermented milk products.

Antiviral, Cytotoxic and Antioxidant Effects of L. Crude Extract In Vitro.

Introduction: Due to the high prevalence of viral infections having no specific treatment and the constant emergence of resistant viral strains, searching for effective antiviral compounds is crucial. The present study explores in vitro the antiviral activity of ethanolic extract from aerial parts of.

Aim: The aim of the current study was to evaluate antiviral activity of ethanolic extract from herbaceous plant.

Comparative study on the antioxidant capacities of synthetic influenza inhibitors and ellagic acid in model systems.

This study compares the antioxidant capacities in vitro of several synthetic and natural compounds applied and researched for influenza treatment - oseltamivir, isoprinosine, ellagic acid, vitamin E and vitamin C. Three chemical systems are utilized for the generation of reactive oxygen species (ROS) at pH 7.4 and pH 8.

Combination activity of neuraminidase inhibitor oseltamivir and α-tocopherol in influenza virus A (H3N2) infection in mice.

Background: Influenza is a highly contagious viral infection of the respiratory system. To attack two processes involved in flu pathogenesis-viral replication in the infected body and oxidative damages, we studied the combination effect of neuraminidase inhibitor oseltamivir and antioxidant α-tocopherol in experimental model of influenza.

Methods: After inoculation of albino mice with 10 MLD50 (50% mouse lethal dose) of influenza virus A/Aichi/2/68 (H3N2), oseltamivir was applied orally at three doses, 2.

Prophylactic and therapeutic combination effects of rimantadine and oseltamivir against influenza virus A (H3N2) infection in mice.

The combined effect of rimantadine and oseltamivir in a prophylactic context (therapy beginning 4 h pre-virus infection) and therapeutic context (therapy started at 24 h post-viral inoculation) course on influenza H3N2 virus infection in mice was studied. In the prophylactic course 5 and 10 mg/kg/day rimantadine with 0.2 and 0.

Rimantadine and oseltamivir demonstrate synergistic combination effect in an experimental infection with type A (H3N2) influenza virus in mice.

We studied the combination effect of rimantadine hydrochloride and oseltamivir phosphate on mice infected with influenza A/Aichi/2/68 (H3N2) virus. Compounds were simultaneously administered in a 5-day-treatment course, starting 4 h before intranasal infection with 10 or 20 viral 50% mouse lethal doses. Initially, we tested combinations of oseltamivir (0.