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16 pages, 2544 KB  
Communication
Sequential [11C]Acetate and [18F]FDG PET/CT Assessment of Systemic Chronic Active Epstein–Barr Virus Disease: An Exploratory Retrospective Study
by Momo Wakui, Shuichi Yanai, Junichi Tsuchiya, Masahide Yamamoto, Hirofumi Yamada, Kota Yokoyama, Shinichi Taura, Tatsuhiko Anzai, Ayako Arai and Ukihide Tateishi
Diagnostics 2026, 16(13), 2071; https://doi.org/10.3390/diagnostics16132071 - 2 Jul 2026
Viewed by 389
Abstract
Systemic chronic active Epstein–Barr virus disease (sCAEBV) is a rare and potentially fatal disorder characterized by inflammatory manifestations and organ infiltration by EBV-infected T- or NK-cells. Although [18F]FDG PET/CT has limited utility for assessing the disease activity of sCAEBV, [11 [...] Read more.
Systemic chronic active Epstein–Barr virus disease (sCAEBV) is a rare and potentially fatal disorder characterized by inflammatory manifestations and organ infiltration by EBV-infected T- or NK-cells. Although [18F]FDG PET/CT has limited utility for assessing the disease activity of sCAEBV, [11C]acetate PET/CT has not previously been evaluated in this setting. We therefore conducted this exploratory retrospective study to assess the utility of sequentially performed [11C]acetate and [18F]FDG PET/CT in sCAEBV. Five patients diagnosed with sCAEBV according to the criteria of the Research Group on Measures against Intractable Diseases, Ministry of Health, Labour and Welfare of Japan (consistent with the 2017 WHO classification) and assessed between July 2017 and December 2018 were included; patients younger than 20 years were excluded. Each patient underwent both [11C]acetate and 2-deoxy-2-[18F]fluoro-D-glucose ([18F]FDG) positron emission tomography/computed tomography (PET/CT) on the same day. The maximum and mean standardized uptake values (SUVmax and SUVmean) of the liver and spleen and the liver-to-spleen ratio (LSR) were correlated with laboratory parameters, including alanine aminotransferase (ALT) and lactate dehydrogenase (LDH), using Spearman’s rank correlation coefficient. The LSR was compared between active and inactive cases using the Mann–Whitney U test. Twenty-one lymph node regions were assessed in each patient, and the SUVmax of detected lesions was measured. The detection rate of lymph node lesions between the two tracers was compared using McNemar’s test, and the SUVmax of lymph node lesions was compared between the two tracers and between active and inactive cases using the Mann–Whitney U test. All statistical analyses were performed using R version 4.5.3 (R Foundation for Statistical Computing, Vienna, Austria), and a p-value < 0.05 was considered statistically significant. Five patients (three men and two women; mean age 31.8 years, range 21–39 years) were included. [11C]acetate PET/CT showed significant negative correlations between spleen SUV and liver enzymes (AST, ALT, and LDH), and significant positive correlations between the LSR and all five liver enzymes tested (AST, ALT, LDH, γGTP, and ALP) (Spearman’s rank correlation coefficient; p < 0.05 for all). No significant correlations were observed with [18F]FDG PET/CT. The LSR on [11C]acetate PET/CT was numerically higher in active cases than in inactive cases, though this difference was not statistically significant (0.88 ± 0.02 vs. 0.61 ± 0.02; p = 0.20, Mann–Whitney U test). Lymph node lesion detectability did not differ significantly between the two tracers (16 vs. 12 regions; p = 0.13, McNemar’s test). In this pilot study, [11C]acetate PET/CT spleen SUV showed significant negative correlations with liver enzymes (AST, ALT, and LDH), and the LSR showed significant positive correlations with all measured liver enzymes, suggesting that [11C]acetate PET/CT reflects both hepatic and splenic involvement in sCAEBV. [11C]acetate PET/CT may therefore serve as a novel imaging biomarker for assessing disease activity in sCAEBV, warranting further investigation in larger cohorts. Full article
(This article belongs to the Section Medical Imaging and Theranostics)
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13 pages, 1831 KB  
Article
Nomogram-Based Prediction Model for Postherpetic Neuralgia in Immunosuppressive Patients
by Xiao-Yuan Pan, Li-Na Lu, Jing Wang, Li-Hong Mei and Gao Yang
J. Clin. Med. 2026, 15(9), 3435; https://doi.org/10.3390/jcm15093435 - 30 Apr 2026
Viewed by 446
Abstract
Background/Objectives: Herpes zoster is caused by varicella-zoster virus reactivation, which often leads to a chronic pain condition named postherpetic neuralgia (PHN). Patients with immunosuppressive conditions face a heightened risk of developing PHN. This study aims to identify factors contributing to PHN development [...] Read more.
Background/Objectives: Herpes zoster is caused by varicella-zoster virus reactivation, which often leads to a chronic pain condition named postherpetic neuralgia (PHN). Patients with immunosuppressive conditions face a heightened risk of developing PHN. This study aims to identify factors contributing to PHN development in immunosuppressive patients. Methods: This retrospective cohort study was conducted involving 219 immunosuppressive patients from two centers and split into training and test cohorts. Participants were divided into PHN (n = 88) and acute phase pain (ACP, n = 131) groups. Univariate and multivariate logistic regression analyses were used to identify clinical predictors of PHN. A nomogram was constructed to predict PHN risk by integrating significant predictors. The discrimination, calibration and clinical usefulness of the nomogram were evaluated. Results: Multivariate analysis revealed metabolic syndrome, older age, higher lactate dehydrogenase (LDH), and higher neutrophil-to-lymphocyte ratio (NLR) as significant PHN predictors. The nomogram showed good discrimination in both training (AUC of 0.83 [95% CI 0.77–0.90] with a specificity of 0.78, sensitivity of 0.87, NPV of 0.90, and PPV of 0.73) and test cohorts (AUC of 0.85 [95% CI 0.75–0.96] with a specificity of 0.82, sensitivity of 0.85, NPV of 0.89, and PPV of 0.76). Clinical decision curve analysis confirmed the practical utility of the nomogram. Conclusions: The nomogram incorporating age, metabolic syndrome, LDH, and NLR are useful in estimating PHN risk among immunosuppressed patients. Full article
(This article belongs to the Special Issue Skin Disease and Inflammation)
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8 pages, 762 KB  
Case Report
Double Trouble: The First Reported Case of Evans Syndrome Following RSV Vaccination
by Mohammad Abu-Tineh, Deepika Beereddy, Ilse Ivonne Saldivar Ruiz and Divya Samat
Hematol. Rep. 2025, 17(6), 68; https://doi.org/10.3390/hematolrep17060068 - 1 Dec 2025
Cited by 1 | Viewed by 1759
Abstract
Background: Evans syndrome is a rare autoimmune disease characterized by immune thrombocytopenia (ITP), autoimmune hemolytic anemia (AIHA), and autoimmune neutropenia, typically triggered by an episode of immune dysregulation or multiple other factors. We present what appears to be the first reported case of [...] Read more.
Background: Evans syndrome is a rare autoimmune disease characterized by immune thrombocytopenia (ITP), autoimmune hemolytic anemia (AIHA), and autoimmune neutropenia, typically triggered by an episode of immune dysregulation or multiple other factors. We present what appears to be the first reported case of Evans syndrome developing in a 66-year-old female following respiratory syncytial virus (RSV) vaccination. Case Presentation: A 66-year-old female presented with a petechial rash on her arms, legs, and face. Laboratory tests revealed a platelet count of 1 × 109/L, significantly lower than her historical baseline of >200 × 109/L. On hospital day 4, her hemoglobin declined from 14.3 g/dL to 9.9 g/dL, with laboratory evidence of hemolysis, including elevated bilirubin, low haptoglobin, and increased lactate dehydrogenase (LDH). Bone marrow biopsy revealed megakaryocytic hyperplasia consistent with ITP, along with a small polyclonal B-cell population lacking CD20 expression. Imaging was unremarkable, showing no interval changes aside from stable pre-existing pulmonary nodules and no lymphadenopathy. These findings supported a diagnosis of Evans syndrome. Initial therapy with dexamethasone and intravenous immunoglobulin (IVIG) for presumed ITP was ineffective. Due to refractory thrombocytopenia, the patient initially received one dose of rituximab, followed by one dose of romiplostim. Subsequently, the patient received rituximab infusions every week at a rate of 375 mg/m2 for four doses, as well as prednisone at a dose of 1 mg/kg/day. Within five weeks, her blood count returned to normal. Conclusions: This case raises concern for a potential temporal association between RSV vaccination and the onset of Evans syndrome. It underscores the need for heightened clinical awareness and further investigation into immune-mediated hematologic complications following RSV immunization. Full article
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17 pages, 10659 KB  
Article
Epstein–Barr Virus Silences GSDME and Pyroptosis in Gastric Cancer
by Min-Hyeok Lee, Ju Yeon Lee, Jun Yeob Kim, Yea Rim An and Suk Kyeong Lee
Microorganisms 2025, 13(12), 2704; https://doi.org/10.3390/microorganisms13122704 - 27 Nov 2025
Cited by 3 | Viewed by 1276
Abstract
Epstein–Barr virus (EBV)-associated gastric carcinoma (EBVaGC) represents a distinct molecular subtype characterized by extensive DNA methylation and altered cell death signaling. This study investigated the regulation and function of gasdermin E (GSDME), a key mediator of pyroptosis, in EBVaGC. Transcriptomic analysis of The [...] Read more.
Epstein–Barr virus (EBV)-associated gastric carcinoma (EBVaGC) represents a distinct molecular subtype characterized by extensive DNA methylation and altered cell death signaling. This study investigated the regulation and function of gasdermin E (GSDME), a key mediator of pyroptosis, in EBVaGC. Transcriptomic analysis of The Cancer Genome Atlas (TCGA) data revealed that GSDME expression was selectively suppressed in EBV-positive gastric cancer, while other gasdermin family members were upregulated. Validation in multiple cell lines confirmed that EBV infection markedly reduced GSDME expression through promoter hypermethylation, which was reversed by treatment with the DNA methyltransferase inhibitor 5-azacytidine. EBV-positive cells exhibited enhanced caspase-3 activation and increased GSDME cleavage upon paclitaxel (PTX) exposure, leading to elevated lactate dehydrogenase (LDH) release and pyroptotic morphology. Overexpression of GSDME amplified, whereas siRNA-mediated knockdown or caspase-3 inhibition suppressed, PTX-induced pyroptosis without significantly altering overall cell viability. These findings demonstrate that EBV-induced epigenetic silencing of GSDME contributes to the modulation of chemotherapy-induced cell death, and that GSDME acts as a critical effector converting apoptosis to pyroptosis through caspase-3 activation. Collectively, our results reveal a novel link between EBV-driven DNA methylation and pyroptotic cell death, suggesting that restoration of GSDME expression may enhance therapeutic responses in EBV-associated gastric cancer. Full article
(This article belongs to the Section Virology)
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15 pages, 2570 KB  
Article
Antibody-Dependent Cellular Cytotoxicity Elicited by the Antibodies Against the E120R Protein of African Swine Fever Virus
by Shengmei Chen, Jing Lan, Zhanhao Lu, Jia Li, Caoyuan Ma, Rui Luo, Qiang Fu, Yuan Sun, Tao Wang and Hua-Ji Qiu
Vaccines 2025, 13(9), 934; https://doi.org/10.3390/vaccines13090934 - 1 Sep 2025
Cited by 3 | Viewed by 1966
Abstract
Background/Objectives: African swine fever (ASF) is a disease of domestic pigs and wild boar caused by African swine fever virus (ASFV), in which infection often leads to high morbidity and mortality. Although subunit and mRNA vaccines based on protective antigens have been explored [...] Read more.
Background/Objectives: African swine fever (ASF) is a disease of domestic pigs and wild boar caused by African swine fever virus (ASFV), in which infection often leads to high morbidity and mortality. Although subunit and mRNA vaccines based on protective antigens have been explored for ASFV, their protective efficacy remains insufficient for practical ASF control, highlighting the need to identify new potential antigens capable of inducing more potent and broadly protective immune responses. Previously, we found that the antibodies against the ASFV E120R protein (pE120R) could significantly inhibit virus replication in primary porcine alveolar macrophages (PAMs). However, it is not yet known whether anti-pE120R antibodies can induce antibody-dependent cellular cytotoxicity (ADCC). Methods: In this study, we analyzed the conservation and immunogenic features of pE120R and established an HEK293T cell line with stable expression of pE120R as target cells (HEK293T-pE120R). Additionally, a co-culture system comprising target cells and peripheral blood mononuclear cells (PBMCs) was established to evaluate the ability of the anti-pE120R antibodies to induce ADCC as measured by lactate dehydrogenase (LDH) release assays. Results: The results showed that pE120R is highly conserved among different ASFV genotypes and contains multiple B-cell and T-cell epitopes. Importantly, LDH release assays demonstrated that anti-pE120R antibodies triggered NK cell-mediated ADCC. Notably, ASFV replication in HEK293T-pE120R cells was not promoted. Conclusions: In summary, pE120R was associated with antibody production in a cytotoxicity assay. The ability of this antigen to induce protective immunity, if any, requires further evaluation in vivo. Full article
(This article belongs to the Special Issue Swine Vaccines and Vaccination)
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13 pages, 1335 KB  
Article
Retrospective Review of Children Hospitalized for Epstein–Barr Virus-Related Infectious Mononucleosis
by Shufeng Tian, Jinjun Zheng, Zhe Zhou, Qingluan Yang, Biao Sun, Yuxi Li, Zengrui Lin, Yuchun Long, Song Guan, Sen Wang, Jiexin Zhuang, Wenhong Zhang, Lingyun Shao and Jikui Deng
Pathogens 2025, 14(7), 702; https://doi.org/10.3390/pathogens14070702 - 16 Jul 2025
Cited by 3 | Viewed by 4960
Abstract
Objectives: Our objective was to investigate the clinical characteristics, complications, and treatment outcomes of Epstein–Barr virus (EBV)-related infectious mononucleosis (IM) in children and to identify risk factors associated with prolonged fever and abnormal liver function. Methods: This retrospective study included 3006 children admitted [...] Read more.
Objectives: Our objective was to investigate the clinical characteristics, complications, and treatment outcomes of Epstein–Barr virus (EBV)-related infectious mononucleosis (IM) in children and to identify risk factors associated with prolonged fever and abnormal liver function. Methods: This retrospective study included 3006 children admitted to Shenzhen Children’s Hospital from May 2009 to April 2024 with suspected EBV-related IM. After excluding cases without etiological evidence and those with underlying diseases, 2660 cases were analyzed. Data on demographics, clinical manifestations, laboratory findings, complications, and treatment outcomes were collected. Logistic regression was used to identify risk factors for prolonged fever and abnormal liver function. Results: Among the 2660 confirmed cases, patients ranged from 8 months to 17 years of age, with a median age of 4 years and a male-to-female ratio of 1.46:1. Co-infections were identified in 369 (13.9%) patients, predominantly with Group A Streptococcus. Complications occurred in 560 (24.46%) of the 2289 patients without co-infections, with bronchitis being the most common (42.68%). Elevated ferritin and atypical lymphocyte percentage were associated with prolonged fever (p < 0.001), while elevated lactate dehydrogenase (LDH) and a lower CD4% predicted abnormal liver function (p < 0.001). Antiviral therapy did not shorten fever duration or hospital stay but prolonged both when combined with corticosteroids or intravenous immunoglobulin (IVIG) (p < 0.001). Conclusions: Specific laboratory markers such as ferritin, atypical lymphocyte percentage, LDH, and CD4% are important predictors of prolonged fever or liver dysfunction in EBV-IM. Our findings suggest that antiviral therapy may not be beneficial in uncomplicated cases and highlight the need for tailored treatment strategies to optimize patient outcomes. Full article
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13 pages, 2774 KB  
Article
Combined Antiviral and Cytoprotective Action of Rosmarinic Acid Against EV-A71 Infection: A Potential Therapeutic Strategy
by Junping Lv, Weishi Lin, Siqi Chao, Jing Xie, Yue Cao, Jinfeng Tie, Yuehua Ke, Binan Lu and Zongran Pang
Pathogens 2025, 14(7), 622; https://doi.org/10.3390/pathogens14070622 - 23 Jun 2025
Cited by 1 | Viewed by 1533
Abstract
Enterovirus A71 (EV-A71), a major etiological agent of hand-foot-mouth disease, can cause severe neurological complications. However, the mechanisms underlying EV-A71-induced cell damage and potential therapeutic strategies remain inadequately understood. Here, we investigated EV-A71 replication dynamics and associated cytopathic effects in nine distinct cell [...] Read more.
Enterovirus A71 (EV-A71), a major etiological agent of hand-foot-mouth disease, can cause severe neurological complications. However, the mechanisms underlying EV-A71-induced cell damage and potential therapeutic strategies remain inadequately understood. Here, we investigated EV-A71 replication dynamics and associated cytopathic effects in nine distinct cell lines, including epithelial, neuronal, immune, and other cell types. Cell viability, membrane integrity, and energy metabolism were assessed using Cell Counting Kit-8 (CCK-8), lactate dehydrogenase (LDH), and adenosine triphosphate (ATP) assays. The antiviral activity of rosmarinic acid (RA), a natural polyphenol, was evaluated by plaque reduction, qPCR, and Western blot. EV-A71 exhibited cell-type-specific replication and cytotoxicity patterns. RA significantly preserved cell viability, reduced LDH release, maintained ATP levels, and suppressed IL-6 expression. Mechanistically, RA inhibited viral replication by downregulating VP1 expression and viral RNA levels. Molecular docking indicated strong binding of RA to the hydrophobic pocket of VP1, potentially disrupting virus-host interactions. Collectively, these findings highlight RA’s combined antiviral and cytoprotective potential, supporting its candidacy as a therapeutic agent against EV-A71 infection. Full article
(This article belongs to the Section Viral Pathogens)
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16 pages, 5263 KB  
Article
Colonizing Bacteria Aggravate Inflammation, Cytotoxicity and Immune Defense During Influenza A Virus Infection
by Liane Giebeler, Christina Ehrhardt, Antje Häder, Thurid Lauf, Stefanie Deinhardt-Emmer and Bettina Löffler
Int. J. Mol. Sci. 2025, 26(11), 5364; https://doi.org/10.3390/ijms26115364 - 3 Jun 2025
Cited by 3 | Viewed by 1529
Abstract
A diverse bacterial community colonizes the respiratory system, including commensals such as Staphylococcus epidermidis (S. epidermidis) and Streptococcus salivarius (S. salivarius), as well as facultative pathogens like Staphylococcus aureus (S. aureus). This study aimed to establish a colonized cell culture model [...] Read more.
A diverse bacterial community colonizes the respiratory system, including commensals such as Staphylococcus epidermidis (S. epidermidis) and Streptococcus salivarius (S. salivarius), as well as facultative pathogens like Staphylococcus aureus (S. aureus). This study aimed to establish a colonized cell culture model to investigate the impact of these bacteria on influenza A virus (IAV) infection. Respiratory epithelial cells were exposed to S. epidermidis, S. salivarius, or S. aureus, using either live or heat-inactivated bacteria, followed by IAV infection. Cell integrity was assessed microscopically, cytotoxicity was measured via LDH assay, and inflammatory responses were analyzed through cytokine expression. Additionally, macrophage function was examined in response to bacterial colonization and IAV infection. While commensals maintained epithelial integrity for 48 h, S. aureus induced severe cell damage and death. The most pronounced epithelial destruction was caused by coinfection with S. aureus and IAV. Notably, commensals did not confer protection against IAV but instead enhanced epithelial inflammation. These effects were dependent on live bacteria, as inactivated bacteria had no impact. However, prior exposure to S. epidermidis and S. salivarius improved macrophage-mediated immune responses against IAV. These findings suggest that while individual commensals do not directly protect epithelial cells, they may contribute to immune training and enhance lung defense mechanisms. Full article
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15 pages, 10062 KB  
Article
A Practical Framework for ASFV Disinfectant Evaluation: Differentiating Cytopathic Effects from Cytotoxicity via Integrated Analytical Methods
by Sok Song, Kyu-Sik Shin, Su-Jeong Kim, Yong Yi Joo, Bokhee Han, So-Hee Park, Hyun-Ok Ku, Wooseog Jeong and Choi-Kyu Park
Pathogens 2025, 14(5), 451; https://doi.org/10.3390/pathogens14050451 - 4 May 2025
Cited by 1 | Viewed by 2431
Abstract
African swine fever virus (ASFV) is a highly virulent DNA virus that has spread globally since its introduction into Georgia in 2007, causing substantial economic losses in the swine industry. In the absence of an effective vaccine, chemical disinfection remains a key strategy [...] Read more.
African swine fever virus (ASFV) is a highly virulent DNA virus that has spread globally since its introduction into Georgia in 2007, causing substantial economic losses in the swine industry. In the absence of an effective vaccine, chemical disinfection remains a key strategy for disease control. However, in cell-based disinfectant efficacy testing, distinguishing between disinfectant-induced cytotoxicity and virus-induced cytopathic effects (CPEs) remains a major challenge, leading to the potential misinterpretation of results. To address this, we developed a multi-step analytical framework to differentiate CPEs from cytotoxicity using a Vero cell-adapted ASFV strain. Virkon® S was tested at three dilutions—375×, 275× (manufacturer-recommended), and 175×—and evaluated through CPE observation, lactate dehydrogenase (LDH) and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays, and antigen detection via lateral flow immunoassay (p30) and immunofluorescence (p54). Notably, the 375× dilution achieved effective viral inactivation with significantly lower cytotoxicity, demonstrating that this framework can facilitate a more refined determination of disinfectant working dilutions. Furthermore, increased p30 signals after disinfection and the observation of lower cytotoxicity in virus-plus-disinfectant groups compared to disinfectant-only groups highlight the complexity of virus-disinfectant interactions and the potential for misinterpretation. This study provides a standardized and interpretable strategy for assessing ASFV disinfectant efficacy and offers a practical basis for evaluating other enveloped viruses in future disinfection studies. Full article
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19 pages, 2409 KB  
Brief Report
Anti-Influenza Activity of 6BIGOE: Improved Pharmacological Profile After Encapsulation in PLGA Nanoparticles
by Josefine Schroeder, Jan Westhoff, Ivan Vilotijević, Oliver Werz, Stephanie Hoeppener, Bettina Löffler, Dagmar Fischer and Christina Ehrhardt
Int. J. Mol. Sci. 2025, 26(9), 4235; https://doi.org/10.3390/ijms26094235 - 29 Apr 2025
Cited by 3 | Viewed by 1916
Abstract
Influenza A virus (IAV) infections continue to threaten public health. Current strategies, such as vaccines and antiviral drugs, are limited due to their time-consuming development and drug-resistant strains. Therefore, new effective treatments are needed. Here, virus-supportive cellular factors are promising drug targets, and [...] Read more.
Influenza A virus (IAV) infections continue to threaten public health. Current strategies, such as vaccines and antiviral drugs, are limited due to their time-consuming development and drug-resistant strains. Therefore, new effective treatments are needed. Here, virus-supportive cellular factors are promising drug targets, and the encapsulation of candidate substances in poly(D,L-lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) is intended to improve their bioavailability. This study investigates the potential of the indirubin derivative 6-bromoindirubin-3′-glycerol-oxime ether (6BIGOE), a glycogen synthase kinase 3 (GSK-3)β inhibitor, for its potential to regulate IAV replication in vitro. The effects of 6BIGOE-loaded PLGA NPs on cell metabolism were assessed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and lactate dehydrogenase (LDH) assays in A549 and Calu-3 cells. Viral replication and spread were monitored in various IAV-infected cell lines in the absence and presence of free and 6BIGOE-loaded PLGA NPs via plaque assays and Western blot analysis. The encapsulation of 6BIGOE in PLGA NPs resulted in reduced negative side effects on cell viability while maintaining antiviral efficacy. Both encapsulated and free 6BIGOE exhibited antiviral activity, potentially through GSK-3β inhibition and the disruption of key signaling pathways required for viral replication. The data indicate 6BIGOE, particularly after encapsulation in NPs, as a potential candidate for further investigation and development as an antiviral agent to treat IAV infections. Full article
(This article belongs to the Section Molecular Nanoscience)
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14 pages, 3234 KB  
Article
Establishment and Evaluation of Fatigue Mice Model in the Convalescence Phase of Influenza A
by Xiaoke Zeng, Cheng Zhang, Jianing Shi, Xuan Ji, Keying Wang, Ling Li and Qinghu He
Viruses 2025, 17(5), 593; https://doi.org/10.3390/v17050593 - 22 Apr 2025
Cited by 2 | Viewed by 1986
Abstract
Certain strains of Influenza A virus (IAV), a primary cause of influenza, can lead to pneumonia. Patients recovering from influenza pneumonia may experience physical discomfort akin to post-acute sequelae of COVID-19 (PASC). Despite extensive clinical research on viral pneumonia during convalescence, animal model [...] Read more.
Certain strains of Influenza A virus (IAV), a primary cause of influenza, can lead to pneumonia. Patients recovering from influenza pneumonia may experience physical discomfort akin to post-acute sequelae of COVID-19 (PASC). Despite extensive clinical research on viral pneumonia during convalescence, animal model studies are scarce, highlighting the need for a reliable model for pharmaceutical research. In this study, BALB/c mice were divided into three groups: NC (control), MC (infected with IAV), and Model (treated with oseltamivir post-infection for five days). A fatigue model was then induced in the Model group through diet restriction and weight-bearing swimming. The results showed the MC group had a 75% survival rate, while the NC and Model groups had 100%. Both the MC and Model groups experienced rapid weight loss followed by gradual recovery, differing significantly from the NC group. From dpi (days post-inoculation) 6 to dpi9, the MC group lost more weight than the NC group. The MC group had the highest pulmonary index, but there was no significant difference in IAV Nucleoprotein (NP) expression across groups. The Model group had higher IL-10 levels than the NC and MC groups, while the MC group had the highest TNF-α expression. Hematoxylin and eosin (H&E) staining revealed pathological changes in the MC and Model groups, with severe damage and pulmonary fibrosis in the MC group. Oxidative stress markers showed the MC group had the highest lactate dehydrogenase (LDH) and malondialdehyde (MDA) levels and lowest superoxide dismutase (SOD) activity. Electron microscopy indicated mitochondrial damage in both the MC and Model groups. The Model group had the lowest splenic and thymic indices, with histological findings showing larger splenic nodules in the MC group and poor thymocyte density and atrophy in the Model group. The successful creation of this mouse model of influenza pneumonia convalescence phase fatigue, exhibiting fatigue syndrome with various symptoms, holds significance for PASC and other viral pneumonia convalescence phase animal model research. Full article
(This article belongs to the Section Human Virology and Viral Diseases)
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13 pages, 2025 KB  
Article
Immune Cell Profiles of Patients with Sickle Cell Disease during Parvovirus B19–Induced Transient Red Cell Aplasia
by E. Kaitlynn Allen, Rhiannon R. Penkert, Jane S. Hankins, Sherri L. Surman, Lee-Ann Van de Velde, Alyssa Cotton, Randall T. Hayden, Li Tang, Xiaomeng Yuan, Ying Zheng, Paul G. Thomas and Julia L. Hurwitz
Vaccines 2024, 12(9), 984; https://doi.org/10.3390/vaccines12090984 - 29 Aug 2024
Cited by 1 | Viewed by 3475
Abstract
Parvovirus B19 frequently infects children and targets cells of the erythroid lineage. Although healthy children rarely suffer severe disease, children with sickle cell disease (SCD) can experience transient red cell aplasia (TRCA), hospitalization, and life-threatening anemia upon first virus exposure. Given that children [...] Read more.
Parvovirus B19 frequently infects children and targets cells of the erythroid lineage. Although healthy children rarely suffer severe disease, children with sickle cell disease (SCD) can experience transient red cell aplasia (TRCA), hospitalization, and life-threatening anemia upon first virus exposure. Given that children with SCD can also suffer chronic inflammation and that parvovirus B19 has been associated with autoimmune disease in other patient populations, we asked if parvovirus B19 infections contributed to acute and chronic immune abnormalities in children with SCD. Nineteen hospitalized patients with SCD and parvovirus B19–induced TRCA were evaluated. Blood tests included CBC, flow cytometry, and total antibody isotype analyses. Cytokine/chemokine analyses were performed on nasal wash (NW) samples, representing a common site of viral entry. Unusually high white blood cell count (WBC) and absolute neutrophil count (ANC) values were observed in some patients. A correlation matrix with Day 0 values from the 19 patients then identified two mutually exclusive phenotype clusters. Cluster 1 included WBC, ANC, absolute reticulocyte count (ARC), absolute lymphocyte count (ALC), lactate dehydrogenase (LDH), NW cytokines/chemokines, % naïve cells among B cell and T cell populations, and parvovirus-specific IgG. This cluster was negatively associated with virus load, suggesting a signature of successful adaptive immunity and virus control. Cluster 2 included virus load, % CD38+CD24 cells among CD19+ B cells (termed ‘plasmablasts’ for simplicity), % HLA-DRlow cells among CD19+ B cells, IgG4, and % memory phenotypes among B cell and T cell populations. Plasmablast percentages correlated negatively with parvovirus-specific IgG, possibly reflecting a non-specific trigger of cell activation. All patients were released from the hospital within 1 week after admission, and the highest WBC and ANC values were eventually reduced. Nonetheless, a concern remained that the acutely abnormal immune profiles caused by parvovirus B19 infections could exacerbate chronic inflammation in some patients. To avoid the numerous sequelae known to affect patients with SCD following hospitalizations with parvovirus B19, rapid development of a parvovirus B19 vaccine is warranted. Full article
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15 pages, 1621 KB  
Article
Layered Double Hydroxides (LDH) as Delivery Vehicles of a Chimeric Protein Carrying Epitopes from the Porcine Reproductive and Respiratory Syndrome Virus
by María José Alonso-Cerda, Mariano J. García-Soto, Arleth Miranda-López, René Segura-Velázquez, José Ivan Sánchez-Betancourt, Omar González-Ortega and Sergio Rosales-Mendoza
Pharmaceutics 2024, 16(7), 841; https://doi.org/10.3390/pharmaceutics16070841 - 21 Jun 2024
Cited by 5 | Viewed by 2972
Abstract
The Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) causes reproductive failure and respiratory symptoms, leading to huge economic losses for the pig farming industry. Although several vaccines against PRRSV are available in the market; they show an overall low efficacy, and several countries [...] Read more.
The Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) causes reproductive failure and respiratory symptoms, leading to huge economic losses for the pig farming industry. Although several vaccines against PRRSV are available in the market; they show an overall low efficacy, and several countries have the need for vaccines covering the local, circulating variants. This project aims at developing a new chimeric antigen targeting specific epitopes from PRRSV and evaluating two test adjuvants to formulate a vaccine candidate. The test antigen was called LTB–PRRSV, which was produced recombinantly in Escherichia coli and consisted of the heat labile enterotoxin B subunit from E. coli (LTB) and four epitopes from PRRSV. LTB–PRRSV was rescued as inclusion bodies and methods for its solubilization, IMAC-based purification, and refolding were standardized, leading to mean yields of 18 mg of pure protein per liter culture. Layered double hydroxides (LDH) have been used as vaccine adjuvants given their biocompatibility, low cost, and positive surface charge that allows an efficient adsorption of negatively charged biomolecules. Therefore, LDH were selected as delivery vehicles of LTB–PRRSV. Pure LTB–PRRSV was adsorbed onto LDH by incubation at different LDH:LTB–PRRSV mass ratios (1:0.25, 1:0.5, 1:1, and 1:2) and at pH 9.5. The best adsorption occurred with a 1:2 mass ratio, and in a sucrose-tween solution. The conjugates obtained had a polydispersity index of 0.26, a hydrodynamic diameter of 192 nm, and a final antigen concentration of 64.2 μg/mL. An immunogenicity assessment was performed by injecting mice with LDH:LTB–PRRSV, Alum/LTB–PRRSV, or LTB–PRRSV in a scheme comprising three immunizations at two-week intervals and two dose levels (1 and 5 μg). LTB–PRRSV was capable of inducing strong humoral responses, which lasted for a longer period when LDH was used as the delivery vehicle/adjuvant. The potential of LDH to serve as an attractive carrier for veterinary vaccines is discussed. Full article
(This article belongs to the Special Issue Transport of Drugs through Biological Barriers—an Asset or Risk)
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11 pages, 8631 KB  
Case Report
Pathogenesis of Hemophagocytic Lymphohistiocytosis/Macrophage Activation Syndrome: A Case Report and Review of the Literature
by Chiara Gioia, Marino Paroli, Raffaella Izzo, Lorenzo Di Sanzo, Elisabetta Rossi, Pasquale Pignatelli and Daniele Accapezzato
Int. J. Mol. Sci. 2024, 25(11), 5921; https://doi.org/10.3390/ijms25115921 - 29 May 2024
Cited by 20 | Viewed by 8332
Abstract
Hemophagocytic lymphohistiocytosis (HLH) is a life-threatening condition characterized by the uncontrolled activation of cytotoxic T lymphocytes, NK cells, and macrophages, resulting in an overproduction of pro-inflammatory cytokines. A primary and a secondary form are distinguished depending on whether or not it is associated [...] Read more.
Hemophagocytic lymphohistiocytosis (HLH) is a life-threatening condition characterized by the uncontrolled activation of cytotoxic T lymphocytes, NK cells, and macrophages, resulting in an overproduction of pro-inflammatory cytokines. A primary and a secondary form are distinguished depending on whether or not it is associated with hematologic, infectious, or immune-mediated disease. Clinical manifestations include fever, splenomegaly, neurological changes, coagulopathy, hepatic dysfunction, cytopenia, hypertriglyceridemia, hyperferritinemia, and hemophagocytosis. In adults, therapy, although aggressive, is often unsuccessful. We report the case of a 41-year-old man with no apparent history of previous disease and an acute onset characterized by fever, fatigue, and weight loss. The man was from Burkina Faso and had made trips to his home country in the previous five months. On admission, leukopenia, thrombocytopenia, increased creatinine and transaminases, LDH, and CRP with a normal ESR were found. The patient also presented with hypertriglyceridemia and hyperferritinemia. An infectious or autoimmune etiology was ruled out. A total body CT scan showed bilateral pleural effusion and hilar mesenterial, abdominal, and paratracheal lymphadenopathy. Lymphoproliferative disease with HLH complication was therefore suspected. High doses of glucocorticoids were then administered. A cytologic analysis of the pleural effusion showed anaplastic lymphoma cells and bone marrow aspirate showed hemophagocytosis. An Epstein–Barr Virus (EBV) DNA load of more than 90000 copies/mL was found. Bone marrow biopsy showed a marrow localization of peripheral T lymphoma. The course was rapidly progressive until the patient died. HLH is a rare but usually fatal complication in adults of hematologic, autoimmune, and malignant diseases. Very early diagnosis and treatment are critical but not always sufficient to save patients. Full article
(This article belongs to the Special Issue Advanced Research on Immune Cells and Cytokines)
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17 pages, 4183 KB  
Article
Enhanced Immunomodulatory Effects of Thymosin-Alpha-1 in Combination with Polyanionic Carbosilane Dendrimers against HCMV Infection
by María de la Sierra Espinar-Buitrago, Esmeralda Magro-López, Elena Vázquez-Alejo and María Ángeles Muñoz-Fernández
Int. J. Mol. Sci. 2024, 25(4), 1952; https://doi.org/10.3390/ijms25041952 - 6 Feb 2024
Cited by 3 | Viewed by 6700
Abstract
Resistance and toxicity associated with current treatments for human cytomegalovirus (HCMV) infection highlight the need for alternatives and immunotherapy has emerged as a promising strategy. This study examined the in vitro immunological effects of co-administration of Thymosin-alpha-1 (Tα1) and polyanionic carbosilane dendrimers (PCDs) [...] Read more.
Resistance and toxicity associated with current treatments for human cytomegalovirus (HCMV) infection highlight the need for alternatives and immunotherapy has emerged as a promising strategy. This study examined the in vitro immunological effects of co-administration of Thymosin-alpha-1 (Tα1) and polyanionic carbosilane dendrimers (PCDs) on peripheral blood mononuclear cells (PBMCs) during HCMV infection. The biocompatibility of PCDs was assessed via MTT and LDH assays. PBMCs were pre-treated with the co-administered compounds and then exposed to HCMV for 48 h. Morphological alterations in PBMCs were observed using optical microscopy and total dendritic cells (tDCs), myeloid dendritic cells (mDCs), and plasmacytoid dendritic cells (pDCs), along with CD4+/CD8+ T cells and regulatory T cells (Treg), and were characterized using multiparametric flow cytometry. The findings revealed that Tα1 + PCDs treatments increased DC activation and maturation. Furthermore, increased co-receptor expression, intracellular IFNγ production in T cells and elevated Treg functionality and reduced senescence were evident with Tα1 + G2-S24P treatment. Conversely, reduced co-receptor expression, intracellular cytokine production in T cells, lower functionality and higher senescence in Treg were observed with Tα1 + G2S16 treatment. In summary, Tα1 + PCDs treatments demonstrate synergistic effects during early HCMV infection, suggesting their use as an alternative therapeutic for preventing virus infection. Full article
(This article belongs to the Section Molecular Immunology)
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