Reduced Lung Inflammation Research Articles

Immunomodulatory activity of omadacycline in vitro and in a murine model of acute lung injury.

Cystic fibrosis (CF) is characterized by chronic airway obstruction, infection, and inflammation leading to progressive loss of lung function and eventual respiratory failure. Omadacycline, a tetracycline antibiotic, demonstrates in vitro activity against key CF pathogens, substantial lung penetration, and increasing clinical evidence for the treatment of lung infections in people with CF (PwCF). Preliminary in vitro data demonstrate that omadacycline exhibits anti-inflammatory activity. This study aims to determine the anti-inflammatory effects of omadacycline in vitro and in a murine model of lipopolysaccharide (LPS)-induced lung neutrophilia. In vitro, THP-1-derived macrophages were treated with omadacycline (20-100 µg/mL) 30 minutes prior to LPS stimulation. Pro-inflammatory cytokine (TNF-α, IL-1β/6), chemokine (CXCL-1/2), and MMP-9 levels were analyzed after 24 hours by ELISA. Omadacycline's effects on IL-8-induced human neutrophil chemotaxis were also investigated. In vivo, omadacycline (2.5-30 mg/kg), comparators dexamethasone (1 mg/kg), and azithromycin (30 mg/kg) were administered 1 hour before and 6 hours after intranasal LPS challenge, respectively. Leukocyte counts and differentials in bronchoalveolar lavage fluid (BALF), inflammatory mediator levels in BALF and lung homogenates, pulmonary edema markers, and the severity of lung injury were evaluated 24 hours or 48 hours post-challenge. Treatment with omadacycline in vitro resulted in significant, dose-dependent reductions in IL-6, CXCL-1, and MMP-9 expression and inhibition of IL-8-induced neutrophil chemotaxis. In vivo, omadacycline yielded protective and therapeutic effects by reducing the production of proinflammatory cytokines and chemokines and neutrophil infiltration into the lungs, along with modestly improving lung injury severity. These preclinical results suggest that omadacycline may provide dual anti-bacterial and anti-inflammatory activities relevant to chronic lung infection treatment in PwCF.IMPORTANCENontuberculous mycobacteria, particularly Mycobacterium abscessus complex (MABSC), are a major concern for people with cystic fibrosis (PwCF) due to their association with deteriorating lung function. A substantial barrier to effective treatment is the limited number of safe and effective antibiotics. Omadacycline offers a potential advancement in managing MABSC infections in cystic fibrosis due to its activity, effective penetration into pulmonary secretions, improved tolerability, and good oral bioavailability as shown in healthy volunteers. Our study is the first to explore omadacycline's effects in a model of sterile lung inflammation and acute lung injury. We found that omadacycline not only has potent anti-bacterial properties but also exhibits anti-inflammatory effects, reducing lung inflammation and injury in our preclinical models. These findings underscore omadacycline's potential as a dual-action therapy for lung infections in PwCF, indicating significant potential to improve patient outcomes and guide more effective antimicrobial therapy decisions.

Prim-O-glucosylcimifugin alleviates influenza virus-induced pneumonia in mice by inhibiting the TGF-β1/PI3KCD/MSK2/RELA signalling pathway.

Prim-O-glucosylcimifugin (POG) is a chromone derived primarily from Saposhnikovia divaricata (Turcz) Schischk and Cimicifuga simplex. Previous research has shown that POG possesses antibacterial, anticancer, anti-inflammatory, antioxidant, anticonvulsant, antipyretic, and analgesic properties. However, the specific impact of POG on influenza-virus-induced pneumonia is not well understood. In this study, we investigated the protective effects and underlying mechanisms of POG in pneumonia caused by influenza A virus (IAV). In vitro, POG was found to have a protective effect against infections caused by the respiratory viruses respiratory syncytial virus (RSV), human coronavirus OC43, and influenza A virus. POG inhibited A/FM/1/1947(H1N1) infection with an EC50 ranging from 3.01 to 10.43 in vitro. Intraperitoneal infection of mice with POG at a dose of 5 or 10 mg/kg resulted in a reduction in IAV-induced pneumonia, as evidenced by decreased pulmonary edema, improved lung histopathology, and reduced inflammatory cell accumulation. At the higher dose (10 mg/kg), POG treatment significantly increased survival rates, decreased viral titres in the lungs, improved lung histology, and reduced lung inflammation in IAV-infected mice. POG also effectively alleviated pulmonary fibrosis by reducing the levels of fibrotic markers (hydroxyproline [Hyp] and transforming growth factor β1 [TGF-β1]) and suppressing the expression of alpha smooth muscle actin (α-SMA), p focal adhesion kinase (p-FAK), and TGF-β1 in lung tissues. In addition, POG inhibited the expression of the RELA proto-oncogene (RELA), phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit delta (PIK3CD), and mitogen- and stress-activated protein kinase 2 (MSK2) in lung tissues. These results indicate that POG may have a protective effect against IAV-induced pneumonia by downregulating the TGF-β1/PI3KCD/MSK2/RELA signalling pathway in the lungs.

The Antifungal Effects of Berberine and Its Proposed Mechanism of Action Through CYP51 Inhibition, as Predicted by Molecular Docking and Binding Analysis

Fungal infections present a significant health risk, particularly in immunocompromised individuals. Berberine, a natural isoquinoline alkaloid, has demonstrated broad-spectrum antimicrobial activity, though its antifungal potential and underlying mechanisms against both yeast-like and filamentous fungi are not fully understood. This study investigates the antifungal efficacy of berberine against Candida albicans, Cryptococcus neoformans, Trichophyton rubrum, and Trichophyton mentagrophytes in vitro, as well as its therapeutic potential in a murine model of cryptococcal infection. Berberine showed strong antifungal activity, with MIC values ranging from 64 to 128 µg/mL. SEM and TEM analyses revealed that berberine induced notable disruptions to the cell wall and membrane in C. neoformans. No signs of cell necrosis or apoptosis were observed in fungal cells treated with 2 × MIC berberine, and it did not increase intracellular ROS levels or affect mitochondrial membrane potential. Molecular docking and binding affinity assays demonstrated a strong interaction between berberine and the fungal enzyme CYP51, with a dissociation constant (KD) of less than 1 × 10−12 M, suggesting potent inhibition of ergosterol biosynthesis. In vivo studies further showed that berberine promoted healing in guinea pigs infected with T. mentagrophytes, and in a murine cryptococcal infection model, it prolonged survival and reduced lung inflammation, showing comparable efficacy to fluconazole. These findings indicate that berberine exerts broad-spectrum antifungal effects through membrane disruption and CYP51 inhibition, highlighting its potential as a promising therapeutic option for fungal infections.

6813 Des-Ciclesonide: A Novel Selective Glucocorticoid Receptor Modulator With Therapeutic Potential for Bronchopulmonary Dysplasia, a Chronic Lung Disease of Prematurity

Abstract Disclosure: N. El Khoury: None. J. Jaumotte: None. C. Min: None. C. Madigan: None. J. Wang: None. U. Chandran: None. V. Sampath: None. T.J. Cole: None. P. Monaghan-Nichols: None. R. Houtman: None. K.W. Nettles: None. D.B. DeFranco: None. Infants born before 30 weeks gestation are at risk of developing bronchopulmonary dysplasia (BPD), a prevalent chronic lung disease of prematurity. Glucocorticoids (GCs) such as dexamethasone (DEX) have been a mainstay of BPD prevention as they reduce lung inflammation and injury. However, their use is encumbered with several adverse effects including hyperglycemia, impaired somatic and brain growth and cerebral palsy. These major concerns have resulted in the AAP recommending caution in GC use in preterm infants.Ciclesonide (CIC), an inhaled GC prodrug approved for the treatment of asthma and allergic rhinitis in children, is converted to the potent glucocorticoid receptor (GR) agonist des-ciclesonide (DES) by enzymes enriched in the airways. We previously reported that s.c. delivery of CIC in neonatal rats activated GR transcriptional responses in lung but did not trigger the adverse effects on somatic growth, brain weight or cerebral white matter loss caused by DEX leading us to propose CIC as a potential new pharmacotherapy for BPD. To determine whether limited systemic metabolism of CIC in neonatal rats was solely responsible for its enhanced safety profile, we assessed various outcomes in neonatal rats followed s.c. delivery of its active metabolite DES. Consistent with previous studies, five daily s.c. injections of DEX led to a reduction in body and brain weight as well as reduced serum levels of insulin-like growth factor-1 and chronic hyperglycemia. Surprisingly, analogous s.c. injection of neonatal rats with DES, which has a higher binding affinity for GR than DEX, did not trigger any of these adverse effects. However, DES is as effective as DEX in reducing the expression of various proinflammatory cytokine mRNAs in neonatal rat lung induced by an 11-day systemic treatment with bleomycin. Bulk RNAseq analyses revealed transcriptional responses of neonatal lung and liver to DES, although less robust than that observed to DEX (i.e., 25% and 13% in lung and liver, respectively). Nonetheless, a NAPing assay for coregulator peptide binding showed increased binding of all the DES responsive peptide interactions relative to DEX and cortisol. All-atom molecular dynamics simulations revealed site-specific H-bonding changes within the GR ligand binding domain (LBD) caused by the bulky C16/C17substitution within DES, which was translated into broader changes in LBD structure, specifically revealed as differences in RMSF in helix 7/8 and the surfaces interacting with the NCOA2 peptide. Furthermore, network pathway analysis illustrated that DES mobility at helix 7/8 uniquely generated a meaningful allosteric signaling pathway between Q642 and NCOA2 peptide. In conclusion, the pharmacokinetic properties of the GR prodrug CIC coupled with the tissue-selective pharmacodynamic properties of its active metabolite DES make this FDA approved drug a potential new therapeutic agent for BPD. Presentation: 6/3/2024

Forsythoside B, the active component of Frosythiae fructuse water extract, alleviates Streptococcus pneumoniae virulence by targeting pneumolysin.

To explore the therapeutic potential of Forsythoside B in treating Streptococcus pneumoniae (S. pneumoniae) infections, focusing on its ability to inhibit pneumolysin activity and protect cells from damage. Hemolysis tests were used to evaluate Forsythoside B's inhibitory effect on pneumolysin activity, while growth curve analysis assessed its impact on S. pneumoniae growth. Western blotting and oligomerization analysis were conducted to examine its influence on pneumolysin oligomerization. Cytotoxicity assays, including LDH release and live/dead cell staining, evaluated the protective effects of Forsythoside B against pneumolysin-induced damage in A549 cells. Additionally, a mouse model was employed to test the effects on survival rates, lung bacterial load, and inflammation. The results showed that Forsythoside B significantly inhibited pneumolysin activity, reduced its oligomerization, and protected A549 cells from damage without affecting bacterial growth. In the mouse model, it improved survival rates and reduced lung inflammation, indicating its potential as a therapeutic agent against S. pneumoniae infections. Forsythoside B shows potential as a therapeutic agent for treating pneumonia, particularly in infections caused by S. pneumoniae.

Anti-inflammatory activity and underlying mechanism against sepsis-induced acute lung injury of a low-molecular-weight polysaccharide from the root of Stemona tuberosa Lour

The root of Stemona tuberosa Lour has been used to treat tuberculosis, scabies, and eczema. Polysaccharides are among its main bioactive ingredients. A low-molecular-weight (1819 Da) polysaccharide (SPS2-A) was obtained from the root of S. tuberosa Lour by optimizing three-phase partitioning, purified using an ion chromatography column, and its effects and mechanisms were investigated. Structural analysis revealed that SPS2-A contained arabinose, galactose (Gal), glucose (Glc), xylose, and mannose. The SPS2-A backbone structure comprised sugar residues →4)-α-D-Glcp-(1→, →4)-α-D-Galp-(1→, and →4,6)-β-D-Galp-(1→, while the side chain primarily comprised α-D-Glcp-(1 → connected to the O-6 position of the residue →4,6)-β-D-Galp-(1→. In vitro, SPS2-A downregulated the expression of interleukin-6 in lipopolysaccharide-induced RAW264.7 macrophages. In vivo, SPS2-A significantly downregulated the expression of myeloperoxidase, interleukin-6, interleukin-1β, and tumor necrosis factor-α in bronchoalveolar lavage fluid and lung tissue. Western blotting analysis indicated that SPS2-A reduced lung inflammation in mice with sepsis-induced acute lung injury by activating the nuclear factor κB pathway. These results suggest that SPS2-A is a potential anti-inflammatory candidate for the treatment of sepsis-induced acute lung injury.

Glycyrrhetinic acid reduces lung inflammation caused by pneumococcal infection by reducing the toxicity of pneumolysin

ObjectiveIn this study, to provide new methods for the treatment of Streptococcus pneumoniae infection, we aimed to describe the anti-inflammatory and antibacterial value of glycyrrhetinic acid on the basis of its inhibitory effect on bacterial growth (without killing the bacteria) and its reduction of the toxicity of S. pneumoniae. MethodsA mouse model was established via intranasal administration of Streptococcus pneumoniae D39, and glycyrrhetinic acid was subcutaneously injected for treatment. The wet‒dry ratio, bacterial flora content and inflammatory factor levels in the mouse lungs were determined. Cell experiments were used to evaluate glycyrrhetinic acid-mediated inhibition of PLY hemolysis and A549 cell death, and WB was used to measure glycyrrhetinic acid-mediated inhibition of PLY oligomerization. ResultsGlycyrrhetinic acid reduced the levels of inflammatory factors, the dry‒wet ratio, the abundance of S. pneumoniae in the lungs of infected mice, pneumolysin-mediated A549 cell death, erythrocyte hemolysis and PLY oligoplasia. ConclusionGlycyrrhetinic acid can reduce the virulence of S. pneumoniae by preventing the oligomerization of PLY.

Targeting mast cell activation alleviates anti-MHC I antibody and LPS-induced TRALI in mice by pharmacologically blocking the TLR3 and MAPK pathway

Transfusion-related lung injury (TRALI) poses a significant risk following blood transfusion and remains the primary cause of transfusion-related morbidity and mortality, primarily driven by the activation of immune cells through anti-major histocompatibility complex class I (anti-MHC I) antibody. However, it remains to be defined how immune microenvironmental cue contributes to TRALI. Here, we uncover that activated mast cells within the immune microenvironment promote lung inflammation and injury in antibody-mediated TRALI, both in vitro and in vivo. This was demonstrated by co-culturing lipopolysaccharide (LPS)-pretreated mast cell line with anti-MHC I antibody and establishing a “two-hit” TRALI mouse model through intratracheal injection of LPS followed by tail-vein injection of anti-MHC I antibody. Importantly, mast cell-deficient KitW-sh/W-sh mice exhibited markedly reduced lung inflammation and injury responses in antibody-mediated TRALI compared with wild-type mice. Mechanistically, activation of toll-like receptor 3 (TLR3)/mitogen-activated protein kinase (MAPK) signaling pathway in mast cells contributes to the enhanced production of proinflammatory factors. These excessive proinflammatory factors produced by activated mast cells contribute to lung inflammation and injury in antibody-mediated TRALI. Pharmacologically targeting the TLR3/MAPK pathway to inhibit mast cell activation normalizes the proinflammatory microenvironment and alleviates lung inflammation and injury in the preclinical TRALI mouse model. Overall, we find that activation of mast cells via the TLR3/MAPK pathway contributes to lung inflammation and injury in antibody-mediated TRALI, providing novel insights into its underlying mechanisms. Furthermore, targeting activated mast cells and the associated pathway offers potential therapeutic strategies for antibody-mediated TRALI.

Combating paediatric pneumonia: the dynamic duo of cinnamon-clove steam and physiotherapy

IntroductionPaediatric community-acquired pneumonia (CAP) is a prevailing respiratory infection that impacts children in non-medical settings, giving rise to substantial morbidity and mortality, especially in less developed areas. The current study was aimed at finding a holistic approach for improving the management and treatment of paediatric CAP. For that purpose, a comparative interventional study was conducted to investigate the effectiveness of chest physiotherapy (CPT) combining with Cinnamon varum and Syzygium aromaticum steam therapy in paediatric CAP. MethodsA total of 60 paediatric patient hospitalised with CAP were assessed. The study included both male and female participants aged between three and 14 years. The study was conducted at Children Hospital and Institute of Child Health in Faisalabad, Pakistan. The subjects were divided into three equal groups: group 1 received CPT, group 2 underwent CPT accompanied with nebulization, and group 3 received CPT along with steam therapy using C. varum and S. aromaticum. Each participant received the assigned therapy twice a day for seven consecutive days. The study was approved and registered by Ethics Review Committee, Government College University, Faisalabad, Pakistan (Reference number GCUF/ERC/214). ResultsAmong the three groups studied, those who received the combined therapy exhibited improved outcome by improving the complete blood count (CBC), spirometer index, arterial blood gases (ABGs) and Systolic blood pressure, Multilobar infiltrates, Albumin, Respiratory rate, Tachycardia, Confusion, Oxygen and pH severity score for pneumonia. ConclusionsThe antimicrobial, anti-inflammatory and mucolytic properties of cinnamon and clove, along with the positive effects of CPT, resulted in reduced lung inflammation, enhanced respiratory performance, and improved vital signs.

VEGFR1 TK signaling protects the lungs against LPS-induced injury by suppressing the activity of alveolar macrophages and enhancing the anti-inflammatory function of monocyte-derived macrophages

Acute lung injury (ALI) is characterized by hyperinflammation followed by vascular leakage and respiratory failure. Vascular endothelial growth factor (VEGF)-A is critical for capillary permeability; however, the role of VEGF receptor 1 (VEGFR1) signaling in ALI progression remains unclear. Here, we show that deletion of VEGFR1 tyrosine kinase (TK) signaling in mice exacerbates lipopolysaccharide (LPS)-induced ALI as evidenced by excessive pro-inflammatory cytokine production and interleukin(IL)-1β-producing neutrophil recruitment to inflamed lung tissues. ALI development involves reduced alveolar macrophage (AM) levels and recruitment of monocyte-derived macrophages (MDMs) in a VEGFR1 TK-dependent manner. VEGFR1 TK signaling reduced pro-inflammatory cytokine levels in cultured AMs. VEGFR1 TK-expressing MDMs displayed an anti-inflammatory macrophage phenotype. Additionally, the transplantation of VEGFR1 TK-expressing bone marrow (BM)-derived macrophages into VEGFR1 TK-deficient mice reduced lung inflammation. Treatment with placental growth factor (PlGF), an agonist for VEGFR1, protected the lung against LPS-induced ALI associated with increased MDMs. These results suggest that VEGFR1 TK signaling prevents LPS-induced ALI by suppressing the pro-inflammatory activity of AMs and enhancing the anti-inflammatory function of MDMs.

Zangsiwei prevents particulate matter-induced lung inflammation and fibrosis by inhibiting the TGF-β/SMAD pathway

Ethnopharmacological relevanceZangsiwei(ZSW) is a traditional Tibetan medicine from China consisting of extracts of Rhododendron anthopogonoides Maxim, Gentiana Tourn, Corydalis hendersonii Hemsl and Berberis kansuensis C.K.Schneid. Traditionally, ZSW has been used by Tibetan physicians to treat chronic respiratory diseases. The role of ZSW in particulate matter-induced lung inflammation and fibrosis remains unclear. Aim of the studyCombining non-targeted metabolomics, network pharmacology, and molecular docking to explore the mechanism of ZSW in the treatment of particulate matter-induced lung inflammation and fibrosis, and validated by in vivo and in vitro experiments. Materials and methodsThe serum metabolite profile post-ZSW administration was first identified utilizing non-targeted metabolomics. Network pharmacology and molecular docking were employed to predict potential bioactive components and their corresponding targets. The in silico predictions were subsequently validated through in vivo studies in mice exposed to PM2.5 and silica dust, as well as in vitro studies utilizing human lung epithelial cells (A549) and lung fibroblasts (MRC5). ResultsMetabolomic analysis identified specific serum metabolites that were associated with ZSW treatment. Network pharmacology and molecular docking identified key targets involved in the Transforming growth factor-β (TGF-β)/SMAD pathway, which were subsequently validated through in vivo experiments demonstrating a reduction in lung inflammation and fibrosis in ZSW-treated mice. In vitro studies demonstrated that ZSW exerts protective effects against PM2.5-induced cytotoxicity and modulates fibrotic markers in a dose-dependent manner. This is consistent with the inhibition of the TGF-β/SMAD pathway. ConclusionOur integrated approach, which combines non-targeted metabolomics, network pharmacology, and molecular docking, followed by rigorous in vivo and in vitro validation, establishes ZSW as a potential therapeutic agent for particulate matter-induced lung inflammation and fibrosis.

Calprotectin is regulated by IL-17A and induces steroid hyporesponsiveness in asthma.

Calprotectin, a calcium-binding protein, plays a crucial role in inflammation and has been associated with various inflammatory diseases, including asthma. However, its regulation and impact on steroid hyporesponsiveness, especially in severe asthma, remain poorly understood. This study investigated the regulation of calprotectin proteins (S100A8 and S100A9) by IL-17 and its role in steroid hyporesponsiveness using in vitro and in vivo models. Calprotectin expression was assessed in primary bronchial fibroblasts from healthy controls and severe asthmatic patients, as well as in mouse models of steroid hyporesponsive lung inflammation induced by house dust mite (HDM) allergen and cyclic-di-GMP (cdiGMP) adjuvant. The effects of IL-17A stimulation on calprotectin expression and steroid response markers in bronchial epithelial and fibroblast cells were examined. Additionally, the therapeutic potential of paquinimod, a calprotectin inhibitor, in mitigating airway inflammation and restoring steroid response signatures in the mouse model was evaluated. The results demonstrated upregulation of calprotectin expression in asthmatic bronchial fibroblasts compared to healthy controls, as well as in refractory asthma samples compared to non-refractory asthma. IL-17 stimulation induced calprotectin expression and dysregulated glucocorticoid response signatures in lung epithelial and fibroblast cells. Treatment with paquinimod reversed IL-17-induced dysregulation of steroid signatures, indicating the involvement of calprotectin in this process. In the HDM/cdiGMP mouse model, paquinimod significantly attenuated airway inflammation and hyperresponsiveness, and restored steroid response signatures, whereas dexamethasone showed limited efficacy. Mechanistically, paquinimod inhibited MAPK/ERK and NF-κB pathways downstream of calprotectin, leading to reduced lung inflammation. These findings highlight calprotectin as a potential therapeutic target regulated by IL-17 in steroid hyporesponsive asthma. Targeting calprotectin may offer a promising approach to alleviate airway inflammation and restore steroid responsiveness in severe asthma. Further investigations are warranted to explore its therapeutic potential in clinical settings and elucidate its broader implications in steroid mechanisms of action.

L-ascorbate Alleviates Chronic Obstructive Pulmonary Disease through the EGF/PI3K/AKT Signaling Axis.

In this study, the molecular mechanisms through which Lascorbate (Vitamin C) potentially treats Chronic Obstructive Pulmonary Disease (COPD) were identified. A non-targeted metabolomics analysis revealed metabolic disorders and significantly reduced levels of L-ascorbate in COPD patients compared to healthy subjects. The COPD rat model was established by exposing them to Cigarette Smoke (CS). The L-ascorbate intervention reduced lung inflammation and histological damage in COPD rat models. Network pharmacology analysis revealed 280 common targets between L-ascorbic acid (drug) and COPD (disease), of which seven core targets were MMP3, MME, PCNA, GCLC, SOD2, EDN1, and EGF. According to molecular docking prediction, L-ascorbate had the highest affinity with EGF. Molecular dynamics simulation indicated relatively stable EGF and L-ascorbate complexes. The PI3K/AKT signaling pathway was significantly enriched in the Kyoto Encyclopedia of Genes and Genomes (KEGG) functional analysis. Finally, the in vivo and in vitro experiments confirmed that L-ascorbate affected COPD by regulating the EGF/PI3K/AKT pathway. In summary, based on network pharmacology and molecular docking analyses, this study revealed that L-ascorbate affects COPD development by regulating the PI3K/AKT signaling pathway through EGF, and thus contributes to the understanding and clinical application of Lascorbate in the treatment of COPD.

Coronavirus nucleocapsid-based vaccine provides partial protection against hetero-species coronavirus in murine models

Most coronavirus vaccines focus on the spike (S) antigen, but the frequent mutations in S raise concerns about the vaccine efficacy against new variants. Although additional antigens with conserved sequences are have been tested, the extent to which these vaccines can provide immunity against different coronavirus species remains unclear. In this study, we assessed the potential of nucleocapsid (N) as a coronavirus vaccine antigen. Immunization with MERS-CoV N induced robust immune responses, providing significant protection against MERS-CoV. Notably, MERS-CoV N elicited cross-reactive T cell responses to SARS-CoV-2 N and significantly reduced lung inflammation following a SARS-CoV-2 challenge in the transient hACE2 mouse model. However, in K18-hACE transgenic mice, the vaccine showed limited protection. Collectively, our findings suggest that coronavirus N can be an effective vaccine antigen against homologous viruses, but its efficacy may vary across different coronaviruses, highlighting the need for further research on pan-coronavirus vaccines using conserved antigens.

IL-35 promotes IL-35+IL-10+ Bregs and Conventional LAG3+ Tregs in the lung tissue of OVA-Induced Asthmatic Mice.

This study aimed to investigate the effect of interleukin-35 (IL-35) on inflamed lung tissue in a murine model of asthma. IL-35 was examined for its potential to induce regulatory lymphocytes during ovalbumin (OVA)-induced acute lung injury. Female BALB/c mice sensitized with OVA and were treated with recombinant IL-35 (rIL-35) via intranasal or intraperitoneal routes and were administered 4h before OVA challenge. The effects of rIL-35 treatment on the lung and blood levels of regulatory B cells (Bregs) and regulatory T cells (Tregs), as well as their production of immunosuppressive cytokines, were determined using flow cytometry and enzyme-linked immunosorbent assay (ELISA), respectively. Treatment of OVA-sensitized asthmatic mice with rIL-35, whether administered intranasally or intraperitoneally, resulted in reduced lung inflammation and injury. This reduction was accompanied by an increase in the frequency of IL-35 producing Bregs, IL-35 and IL-10 producing Bregs, and conventional LAG3+ Tregs in the lung tissues and blood. This increase was more pronounced with intranasal rIL-35. Furthermore, there was a positive correlation between the levels of these regulatory cells and lung gene expression of IL-35 and IL-10, and an inverse correlation with both lung gene expression and plasma level of IL-17. The results of this study suggest that IL-35, through its ability to increase Bregs and Tregs, is effective in reversing lung inflammation in the context of asthma. Since the increase was more pronounced with intranasal administration, this highlights the therapeutic potential of its local intrapulmonary application in managing asthma-related inflammation.

Visualized and pH-responsive hydrogel antibacterial coating for ventilator-associated pneumonia

Ventilator-associated pneumonia (VAP) is a common healthcare-acquired infection often arising during artificial ventilation using endotracheal intubation (ETT), which offers a platform for bacterial colonization and biofilm development. In particular, the effects of prolonged COVID-19 on the respiratory system. Herein, we developed an antimicrobial coating (FK-MEM@CMCO-CS) capable of visualizing pH changes based on bacterial infection and releasing meropenem (MEM) and FK13-a1 in a controlled manner. Using a simple dip-coating process with controlled loading, chitosan was cross-linked with sodium carboxymethyl cellulose oxidation (CMCO) and coated onto PVC-based ETT to form a hydrogel coating. Subsequently, the coated segments were immersed in an indicator solution containing bromothymol blue (BTB), MEM, and FK13-a1 to fabricate the FK-MEM@CMCO-CS coating. In vitro studies have shown that MEM and FK13-a1 can be released from coatings in a pH-responsive manner. Moreover, anti-biofilm and antibacterial adhesion results showed that FK-MEM@CMCO-CS coating significantly inhibited biofilm formation and prevented their colonization of the coating surface. In the VAP rat model, the coating inhibited bacterial growth, reduced lung inflammation, and had good biocompatibility. The coating can be applied to the entire ETT and has the potential for industrial production.

Peritoneal Infusion of Oxygen Microbubbles Alters the Metabolomic Profile of the Lung and Spleen in Acute Hypoxic Exposure.

Administration of oxygen microbubbles (OMBs) has been shown to increase oxygen and decrease carbon dioxide in systemic circulation, as well as reduce lung inflammation and promote survival in preclinical models of hypoxia caused by lung injury. However, their impact on microenvironmental oxygenation remains unexplored. Herein, we investigated the effects of intraperitoneal administration of OMBs in anesthetized rats exposed to hypoxic ventilation (FiO2 = 0.14). Blood oxygenation and hemodynamics were evaluated over a 2 h time frame, and then organ and tissue samples were collected for hypoxic and metabolic analyses. Data showed that OMBs improved blood SaO2 (~14%) and alleviated tissue hypoxia within the microenvironment of the kidney and intestine at 2 h of hypoxia. Metabolomic analysis revealed OMBs induced metabolic differences in the cecum, liver, kidney, heart, red blood cells and plasma. Within the spleen and lung, principal component analysis showed a metabolic phenotype more comparable to the normoxic group than the hypoxic group. In the spleen, this shift was characterized by reduced levels of fatty acids and 2-hydroxygluterate, alongside increased expression of antioxidant enzymes such as glutathione and hypoxanthine. Interestingly, there was also a shuttle effect within the metabolism of the spleen from the tricarboxylic acid cycle to the glycolysis and pentose phosphate pathways. In the lung, metabolomic analysis revealed upregulation of phosphatidylethanolamine and phosphatidylcholine synthesis, indicating a potential indirect mechanism through which OMB administration may improve lung surfactant secretion and prevent alveolar collapse. In addition, cell-protective purine salvage was increased within the lung. In summary, oxygenation with intraperitoneal OMBs improves systemic blood and local tissue oxygenation, thereby shifting metabolomic profiles of the lung and spleen toward a healthier normoxic state.

Herb-CMap: a multimodal fusion framework for deciphering the mechanisms of action in traditional Chinese medicine using Suhuang antitussive capsule as a case study.

Herbal medicines, particularly traditional Chinese medicines (TCMs), are a rich source of natural products with significant therapeutic potential. However, understanding their mechanisms of action is challenging due to the complexity of their multi-ingredient compositions. We introduced Herb-CMap, a multimodal fusion framework leveraging protein-protein interactions and herb-perturbed gene expression signatures. Utilizing a network-based heat diffusion algorithm, Herb-CMap creates a connectivity map linking herb perturbations to their therapeutic targets, thereby facilitating the prioritization of active ingredients. As a case study, we applied Herb-CMap to Suhuang antitussive capsule (Suhuang), a TCM formula used for treating cough variant asthma (CVA). Using in vivo rat models, our analysis established the transcriptomic signatures of Suhuang and identified its key compounds, such as quercetin and luteolin, and their target genes, including IL17A, PIK3CB, PIK3CD, AKT1, and TNF. These drug-target interactions inhibit the IL-17 signaling pathway and deactivate PI3K, AKT, and NF-κB, effectively reducing lung inflammation and alleviating CVA. The study demonstrates the efficacy of Herb-CMap in elucidating the molecular mechanisms of herbal medicines, offering valuable insights for advancing drug discovery in TCM.

Comparative single-cell analysis reveals IFN-γ as a driver of respiratory sequelae after acute COVID-19.

Postacute sequelae of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection (PASC) represent an urgent public health challenge and are estimated to affect more than 60 million individuals globally. Although a growing body of evidence suggests that dysregulated immune reactions may be linked with PASC symptoms, most investigations have primarily centered around blood-based studies, with few focusing on samples derived from affected tissues. Furthermore, clinical studies alone often provide correlative insights rather than causal mechanisms. Thus, it is essential to compare clinical samples with relevant animal models and conduct functional experiments to understand the etiology of PASC. In this study, we comprehensively compared bronchoalveolar lavage fluid single-cell RNA sequencing data derived from clinical PASC samples and a mouse model of PASC. This revealed a pro-fibrotic monocyte-derived macrophage response in respiratory PASC, as well as abnormal interactions between pulmonary macrophages and respiratory resident T cells, in both humans and mice. Interferon-γ (IFN-γ) emerged as a key node mediating the immune anomalies in respiratory PASC. Neutralizing IFN-γ after the resolution of acute SARS-CoV-2 infection reduced lung inflammation and tissue fibrosis in mice. Together, our study underscores the importance of performing comparative analysis to understand the cause of PASC and suggests that the IFN-γ signaling axis might represent a therapeutic target.

Isothiocyanate-Corticosteroid Conjugates against asthma: Unity makes strength

Asthma is a major noncommunicable disease, affecting both children and adults, and represents one of the major causes leading to high health care costs due to the need for chronic pharmacological treatments. The standard gold therapy of inflammation in asthmatic patients involves the use of glucocorticoids even if their chronic use is often related to serious adverse effects. Growing evidence suggests the biological relevance of hydrogen sulfide (H2S) in the pathogenesis of airway diseases. Hence, aiming to associate the beneficial effects of steroidal anti-inflammatory drugs (SAIDs) to H2S biological activity, we designed and synthesized novel multi-target molecules by chemically combining a group of glucocorticoids, usually employed in asthma treatment, with an isothiocyanate moiety, well-known for its H2S releasing properties. Firstly, the synthesized compounds have been screened for their H2S-releasing profile using an amperometric approach and for their in vitro effects on the degranulation process, using RBL-2H3 cell line. The physicochemical profile, in terms of solubility, chemical and enzymatic stability of the newly hybrid molecules, has been assessed at different physiological pH values and in esterase-rich medium (bovine serum albumin, BSA). The selected compound 5c, through both its corticosteroid and H2S releasing component, has been evaluated in vivo in experimental model of asthma. The compound 5c inhibited in vivo all asthma features with a significative effect on the restoration of pulmonary structure and reduction of lung inflammation.