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1.
Cell Rep Med ; 5(5): 101573, 2024 May 21.
Artigo em Inglês | MEDLINE | ID: mdl-38776874

RESUMO

Epstein-Barr virus (EBV) is linked to various malignancies and autoimmune diseases, posing a significant global health challenge due to the lack of specific treatments or vaccines. Despite its crucial role in EBV infection in B cells, the mechanisms of the glycoprotein gp42 remain elusive. In this study, we construct an antibody phage library from 100 EBV-positive individuals, leading to the identification of two human monoclonal antibodies, 2B7 and 2C1. These antibodies effectively neutralize EBV infection in vitro and in vivo while preserving gp42's interaction with the human leukocyte antigen class II (HLA-II) receptor. Structural analysis unveils their distinct binding epitopes on gp42, different from the HLA-II binding site. Furthermore, both 2B7 and 2C1 demonstrate potent neutralization of EBV infection in HLA-II-positive epithelial cells, expanding our understanding of gp42's role. Overall, this study introduces two human anti-gp42 antibodies with potential implications for developing EBV vaccines targeting gp42 epitopes, addressing a critical gap in EBV research.


Assuntos
Anticorpos Monoclonais , Epitopos , Infecções por Vírus Epstein-Barr , Herpesvirus Humano 4 , Humanos , Herpesvirus Humano 4/imunologia , Infecções por Vírus Epstein-Barr/imunologia , Infecções por Vírus Epstein-Barr/virologia , Anticorpos Monoclonais/imunologia , Epitopos/imunologia , Animais , Anticorpos Neutralizantes/imunologia , Anticorpos Antivirais/imunologia , Camundongos , Antígenos de Histocompatibilidade Classe II/imunologia , Antígenos de Histocompatibilidade Classe II/metabolismo , Proteínas Virais/imunologia , Linfócitos B/imunologia
2.
Exp Mol Med ; 56(5): 1137-1149, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38689087

RESUMO

Osimertinib, a selective third-generation epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI), effectively targets the EGFR T790M mutant in non-small cell lung cancer (NSCLC). However, the newly identified EGFR C797S mutation confers resistance to osimertinib. In this study, we explored the role of pyruvate dehydrogenase kinase 1 (PDK1) in osimertinib resistance. Patients exhibiting osimertinib resistance initially displayed elevated PDK1 expression. Osimertinib-resistant cell lines with the EGFR C797S mutation were established using A549, NCI-H292, PC-9, and NCI-H1975 NSCLC cells for both in vitro and in vivo investigations. These EGFR C797S mutant cells exhibited heightened phosphorylation of EGFR, leading to the activation of downstream oncogenic pathways. The EGFR C797S mutation appeared to increase PDK1-driven glycolysis through the EGFR/AKT/HIF-1α axis. Combining osimertinib with the PDK1 inhibitor leelamine helped successfully overcome osimertinib resistance in allograft models. CRISPR-mediated PDK1 knockout effectively inhibited tumor formation in xenograft models. Our study established a clear link between the EGFR C797S mutation and elevated PDK1 expression, opening new avenues for the discovery of targeted therapies and improving our understanding of the roles of EGFR mutations in cancer progression.


Assuntos
Acrilamidas , Compostos de Anilina , Carcinoma Pulmonar de Células não Pequenas , Resistencia a Medicamentos Antineoplásicos , Receptores ErbB , Neoplasias Pulmonares , Mutação , Piruvato Desidrogenase Quinase de Transferência de Acetil , Humanos , Acrilamidas/farmacologia , Acrilamidas/uso terapêutico , Receptores ErbB/genética , Receptores ErbB/metabolismo , Resistencia a Medicamentos Antineoplásicos/genética , Carcinoma Pulmonar de Células não Pequenas/tratamento farmacológico , Carcinoma Pulmonar de Células não Pequenas/genética , Carcinoma Pulmonar de Células não Pequenas/patologia , Carcinoma Pulmonar de Células não Pequenas/metabolismo , Compostos de Anilina/farmacologia , Compostos de Anilina/uso terapêutico , Neoplasias Pulmonares/tratamento farmacológico , Neoplasias Pulmonares/genética , Neoplasias Pulmonares/patologia , Neoplasias Pulmonares/metabolismo , Piruvato Desidrogenase Quinase de Transferência de Acetil/metabolismo , Piruvato Desidrogenase Quinase de Transferência de Acetil/genética , Animais , Linhagem Celular Tumoral , Camundongos , Ensaios Antitumorais Modelo de Xenoenxerto , Inibidores de Proteínas Quinases/farmacologia , Inibidores de Proteínas Quinases/uso terapêutico , Feminino , Masculino , Indóis , Pirimidinas
3.
J Cardiothorac Surg ; 19(1): 155, 2024 Mar 26.
Artigo em Inglês | MEDLINE | ID: mdl-38532497

RESUMO

BACKGROUND: To demonstrate the effectiveness and feasibility of robotic portal resection (RPR) for mediastinal tumour using a prospectively collected database. METHODS: Data from 73 consecutive patients with mediastinal tumours who underwent RPRs were prospectively collected from August 2018 to April 2023. All patients underwent chest and abdominal enhanced computed tomography (CT) and preoperative multidisciplinary team (MDT) discussion. The patients were stratified into two groups based on tumour size: Group A (tumour size < 4 cm) and Group B (tumour size ≥ 4 cm). General clinical characteristics, surgical procedures, and short outcomes were promptly recorded. RESULTS: All of the cases were scheduled for RPRs. One patient (1/73, 1.4%) was switched to a small utility incision approach because of extensive pleural adhesion. Two patients (2.8%) converted to sternotomy, however, no perioperative deaths occurred. Most of the tumours were located in the anterior mediastinum (51/73, 69.9%). Thymoma (27/73, 37.0%) and thymic cyst (16/73, 21.9%) were the most common diagnoses. The median diameter of tumours was 3.2 cm (IQR, 2.4-4.5 cm). The median total operative time was 61.0 min (IQR, 50.0-90.0 min). The median intraoperative blood loss was 20 mL (IQR, 5.0-30.0 ml), and only one patient (1.4%) experienced an intraoperative complication. The median length of hospital stay was 3 days (IQR, 2-4 days). Compared with Group A, the median total operative time and console time of Group B were significantly longer (P = 0.006 and P = 0.003, respectively). The volume of drainage on the first postoperative day was greater in group B than in group A (P = 0.013). CONCLUSION: RPR is a safe and effective technique for mediastinal tumour treatment, which can expand the application of minimally invasive surgery for the removal of complicated mediastinal tumours.


Assuntos
Neoplasias do Mediastino , Procedimentos Cirúrgicos Robóticos , Robótica , Timoma , Neoplasias do Timo , Humanos , Neoplasias do Mediastino/cirurgia , Robótica/métodos , Neoplasias do Timo/cirurgia , Timoma/cirurgia , Resultado do Tratamento , Estudos Retrospectivos
5.
Cell Host Microbe ; 31(11): 1882-1897.e10, 2023 11 08.
Artigo em Inglês | MEDLINE | ID: mdl-37848029

RESUMO

Epstein-Barr virus (EBV) is a global public health concern, as it is known to cause multiple diseases while also being etiologically associated with a wide range of epithelial and lymphoid malignancies. Currently, there is no available prophylactic vaccine against EBV. gB is the EBV fusion protein that mediates viral membrane fusion and participates in host recognition, making it critical for EBV infection in both B cells and epithelial cells. Here, we present a gB nanoparticle, gB-I53-50 NP, that displays multiple copies of gB. Compared with the gB trimer, gB-I53-50 NP shows improved structural integrity and stability, as well as enhanced immunogenicity in mice and non-human primate (NHP) preclinical models. Immunization and passive transfer demonstrate a robust and durable protective antibody response that protects humanized mice against lethal EBV challenge. This vaccine candidate demonstrates significant potential in preventing EBV infection, providing a possible platform for developing prophylactic vaccines for EBV.


Assuntos
Infecções por Vírus Epstein-Barr , Vacinas , Cricetinae , Animais , Camundongos , Herpesvirus Humano 4 , Infecções por Vírus Epstein-Barr/prevenção & controle , Formação de Anticorpos , Células CHO , Anticorpos Neutralizantes , Anticorpos Antivirais
7.
Thorac Cancer ; 14(16): 1512-1519, 2023 06.
Artigo em Inglês | MEDLINE | ID: mdl-37128686

RESUMO

BACKGROUND: To explore whether robotic lobectomy (RL) is superior to video-assisted lobectomy (VAL) in terms of short-term outcomes in patients with pulmonary neoplasms. METHODS: From January 30, 2019 to February 28, 2022, a series of consecutive minimally invasive lobectomies were performed for patients with pulmonary neoplasms. Perioperative outcomes such as operation time, blood loss, dissected lymph nodes (LNs), surgical complications, postoperative pain control, length of postoperative stay in hospital, and total cost of hospitalization were compared. RESULTS: A total of 336 cases including 173 RLs and 163 VALs were enrolled. Baseline characteristics were comparable between groups. RLs were associated with shorter operation time (median [interquadrant range, IQR], 107 min [90-130] vs. 120 min [100-149], p < 0.001), less blood loss (median [IQR], 50 mL [30-60] vs. 50 mL [50-80], p = 0.02), and lower blood transfusion rate (3.5% vs. 9.8%, p = 0.02) compared with VALs. More LNs were harvested by the robotic approach (median [IQR], 29 [20-41] vs. 22 [15-45], p = 0.04). The incidences of conversion, major postoperative complications, extra analgesic usage, and postoperative length of stay were all comparable between the RL and VAL groups. As predicted, the total cost of hospitalization was greater in the RL group (median [IQR], $16728.35 [15682.16-17872.15] vs. $10713.47 [9662.13-11742.15], p < 0.001). CONCLUSION: RL improved surgical efficacy with shortened operative time, less blood loss, and more thorough LN dissection compared with VAL, compromised by higher cost.


Assuntos
Neoplasias Pulmonares , Procedimentos Cirúrgicos Robóticos , Humanos , Resultado do Tratamento , Estudos Retrospectivos , Pneumonectomia/efeitos adversos , Neoplasias Pulmonares/patologia , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/cirurgia , Tempo de Internação , Cirurgia Torácica Vídeoassistida/efeitos adversos
8.
J Med Virol ; 95(5): e28793, 2023 05.
Artigo em Inglês | MEDLINE | ID: mdl-37212266

RESUMO

Epstein-Barr virus (EBV) infection is prevalent in global population and associated with multiple malignancies and autoimmune diseases. During the infection, EBV-harbored or infected cell-expressing antigen could elicit a variety of antibodies with significant role in viral host response and pathogenesis. These antibodies have been extensively evaluated and found to be valuable in predicting disease diagnosis and prognosis, exploring disease mechanisms, and developing antiviral agents. In this review, we discuss the versatile roles of EBV antibodies as important biomarkers for EBV-related diseases, potential driving factors of autoimmunity, and promising therapeutic agents for viral infection and pathogenesis.


Assuntos
Doenças Autoimunes , Infecções por Vírus Epstein-Barr , Esclerose Múltipla , Humanos , Infecções por Vírus Epstein-Barr/diagnóstico , Infecções por Vírus Epstein-Barr/tratamento farmacológico , Infecções por Vírus Epstein-Barr/complicações , Herpesvirus Humano 4 , Anticorpos Antivirais , Doenças Autoimunes/complicações , Antivirais/uso terapêutico
9.
Food Funct ; 14(6): 2857-2869, 2023 Mar 20.
Artigo em Inglês | MEDLINE | ID: mdl-36880662

RESUMO

Immunoglobulin (Ig)E-associated mast cell (MC) activation triggers pro-inflammatory signals that underlie type I allergic diseases. Here, we examined the effects of the natural isoflavone formononetin (FNT) on IgE-mediated MC activation and associated mechanisms of high-affinity IgE receptor (FcεRI) signal inhibition. The effects of FNT on the mRNA expression of inflammatory factors, release of histamine and ß-hexosaminidase (ß-hex), and expression of signaling proteins and ubiquitin (Ub)-specific proteases (USPs) were analyzed in two sensitized/stimulated MC lines. FcεRIγ-USP interactions were detected by co-immunoprecipitation (IP). FNT dose-dependently inhibited ß-hex activity, histamine release, and inflammatory cytokine expression in FcεRI-activated MCs. FNT suppressed IgE-induced NF-κB and MAPK activity in MCs. The oral administration of FNT attenuated passive cutaneous anaphylaxis (PCA) reactions and ovalbumin (OVA)-induced active systemic anaphylaxis (ASA) reactions in mice. FNT reduced the FcεRIγ chain expression, via increased proteasome-mediated degradation, and induced FcεRIγ ubiquitination by inhibiting USP5 and/or USP13. FNT and USP inhibition may be useful for suppressing IgE-mediated allergic diseases.


Assuntos
Anafilaxia , Isoflavonas , Camundongos , Animais , Receptores de IgE/genética , Receptores de IgE/metabolismo , Mastócitos , Transdução de Sinais , Anafilaxia/tratamento farmacológico , Imunoglobulina E/metabolismo , Isoflavonas/farmacologia , Isoflavonas/metabolismo , Inflamação/tratamento farmacológico , Inflamação/metabolismo , Degranulação Celular
10.
Ann Surg Oncol ; 30(5): 2757-2764, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-36774436

RESUMO

BACKGROUND: Our study aimed to compare the short-term outcomes between robot-assisted segmentectomy (RAS) and video-assisted segmentectomy (VAS) for small pulmonary nodules. METHODS: The study included of 299 segmentectomies (132 RAS and 167 VAS procedures) for small pulmonary nodules between June 2018 and November 2021. The patients were divided into two groups: the RAS group and the VAS group. Propensity score-matching (PSM) analysis was performed to minimize bias. A logistic regression model was performed to identify the independent risk factors associated with complications. RESULTS: Before PSM, the following clinical variables were not balanced: age (P = 0.004), tumor size (P < 0.001), forced expiratory volume for 1 s (FEV1), and FEV1 percentage (P < 0.001). The patients with RAS had a shorter operative time (P = 0.014), less blood loss, a shorter postoperative hospital stay, less use of strong opioids, less drainage on postoperative day 1, and less postoperative total drainage, but more cost (all P < 0.001). Conversion to open surgery was performed for two patients in the VAS group but none in the RAS group. After PSM, 53 pairs were successfully matched. The data again suggested that the patients with RAS had less blood loss, a shorter postoperative hospital stay, and less use of strong opioids, but more cost (all P < 0.001). The operation time also was shorter in the RAS group, with a borderline statistically significant P value (0.053). CONCLUSIONS: In our study, RAS had better short-term outcomes than VAS, indicating a safer and more efficient technique than VAS.


Assuntos
Nódulos Pulmonares Múltiplos , Robótica , Humanos , Pneumonectomia/métodos , Pontuação de Propensão , Mastectomia Segmentar , Cirurgia Torácica Vídeoassistida/efeitos adversos , Estudos Retrospectivos
12.
J Robot Surg ; 17(4): 1477-1484, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-36787021

RESUMO

Although robotic segmentectomy has been applied for the treatment of small pulmonary lesions for many years, studies on the learning curve of robotic segmentectomy are quite limited. Thus, we aim to investigate the learning curve of robotic portal segmentectomy with 4 arms (RPS-4) using prospectively collected data in patients with small pulmonary lesions. One hundred consecutive patients with small pulmonary lesions who underwent RPS-4 between June 2018 and April 2021 were included in the study. Da Vinci Si/Xi systems were used to perform RPS-4. The mean operative time, console time, and docking time for the entire cohort were 119.2 ± 41.6, 85.0 ± 39.6, and 6.6 ± 2.8 min, respectively. The learning curve of RPS-4 can be divided into three different phases: 1-37 cases (learning phase), 38-78 cases (plateau phase), and > 78 cases (mastery phase). Moreover, 64 cases were required to ensure acceptable surgical outcomes. The total operative time (P < 0.001), console time (P < 0.001), blood loss (P < 0.001), and chest tube duration (P = 0.014) were reduced as experience increased. In conclusion, the learning curve of RPS-4 could be divided into three phases. 37 cases were required to pass the learning phase, and 78 cases were needed to truly master this technique.


Assuntos
Procedimentos Cirúrgicos Robóticos , Robótica , Humanos , Procedimentos Cirúrgicos Robóticos/métodos , Pneumonectomia , Curva de Aprendizado , Estudos Retrospectivos , Duração da Cirurgia
13.
World J Clin Cases ; 10(35): 13044-13051, 2022 Dec 16.
Artigo em Inglês | MEDLINE | ID: mdl-36568994

RESUMO

BACKGROUND: Whipple's disease is a rare systemic infection caused by Tropheryma whipplei. Most patients present with nonspecific symptoms, and routine laboratory and imaging examination results also lack specificity. The diagnosis often relies on invasive manipulation, pathological examination, and molecular techniques. These difficulties in diagnosing Whipple's disease often result in misdiagnosis and inappropriate treatments. CASE SUMMARY: This paper reports on the case of a 58-year-old male patient who complained of fatigue and decreased exercise capacity. The results of routine blood tests indicated hypochromic microcytic anemia. Results of gastroscopy and capsule endoscopy showed multiple polypoid bulges distributed in the duodenal and proximal jejunum. A diagnosis of small intestinal adenomatosis was initially considered; hence, the Whipple procedure, a pylorus-preserving pancreaticoduodenectomy, was performed. Pathological manifestations showed many periodic acid-Schiff-positive macrophages aggregated in the intestinal mucosa of the duodenum, upper jejunum, and surrounding lymph nodes. Based on comprehensive analysis of symptoms, laboratory findings, and pathological manifestations, the patient was finally diagnosed with Whipple's disease. After receiving 1 mo of antibiotic treatment, the fatigue and anemia were significantly improved. CONCLUSION: This case presented with atypical gastrointestinal manifestations and small intestinal polypoid bulges, which provided new insight on the diagnosis of Whipple's disease.

14.
Viruses ; 14(11)2022 10 27.
Artigo em Inglês | MEDLINE | ID: mdl-36366470

RESUMO

The Epstein-Barr virus (EBV) is associated with a variety of human malignancies, including Burkitt's lymphoma, Hodgkin's disease, nasopharyngeal carcinoma and gastric cancers. EBV infection is crucial for the oncogenesis of its host cells. The prerequisite for the establishment of infection is the virus entry. Interactions of viral membrane glycoproteins and host membrane receptors play important roles in the process of virus entry into host cells. Current studies have shown that the main tropism for EBV are B cells and epithelial cells and that EBV is also found in the tumor cells derived from NK/T cells and leiomyosarcoma. However, the process of EBV infecting B cells and epithelial cells significantly differs, relying on heterogenous glycoprotein-receptor interactions. This review focuses on the tropism and molecular mechanism of EBV infection. We systematically summarize the key molecular events that mediate EBV cell tropism and its entry into target cells and provide a comprehensive overview.


Assuntos
Infecções por Vírus Epstein-Barr , Doença de Hodgkin , Humanos , Herpesvirus Humano 4 , Linfócitos B , Glicoproteínas , Tropismo
15.
J Virol ; 96(13): e0038322, 2022 07 13.
Artigo em Inglês | MEDLINE | ID: mdl-35699445

RESUMO

Despite the rapid deployment of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccines, the emergence of SARS-CoV-2 variants and reports of their immune evasion characteristics have led to an urgent need for novel vaccines that confer potent cross-protective immunity. In this study, we constructed three different SARS-CoV-2 spike S1-conjugated nanoparticle vaccine candidates that exhibited high structural homogeneity and stability. Notably, these vaccines elicited up to 50-times-higher neutralizing antibody titers than the S1 monomer in mice. Crucially, it was found that the S1-conjugated nanoparticle vaccine could elicit comparable levels of neutralizing antibodies against wild-type or emerging variant SARS-CoV-2, with cross-reactivity to SARS-CoV and Middle East respiratory syndrome coronavirus (MERS-CoV), the effect of which could be further enhanced using our designed nanoparticles. Our results indicate that the S1-conjugated nanoparticles are promising vaccine candidates with the potential to elicit potent and cross-reactive immunity against not only wild-type SARS-CoV-2, but also its variants of concern, variants of interest, and even other pathogenic betacoronaviruses. IMPORTANCE The emergence of SARS-CoV-2 variants led to an urgent demand for a broadly effective vaccine against the threat of variant infection. The spike protein S1-based nanoparticle designed in our study could elicit a comprehensive humoral response toward different SARS-CoV-2 variants of concern and variants of interest and will be helpful to combat COVID-19 globally.


Assuntos
Formação de Anticorpos , Vacinas contra COVID-19 , COVID-19 , Nanopartículas , SARS-CoV-2 , Glicoproteína da Espícula de Coronavírus , Animais , Anticorpos Neutralizantes/sangue , Anticorpos Antivirais/sangue , Formação de Anticorpos/imunologia , COVID-19/prevenção & controle , Vacinas contra COVID-19/imunologia , Humanos , Camundongos , SARS-CoV-2/genética , SARS-CoV-2/imunologia , Glicoproteína da Espícula de Coronavírus/imunologia
16.
Signal Transduct Target Ther ; 7(1): 202, 2022 06 28.
Artigo em Inglês | MEDLINE | ID: mdl-35764603

RESUMO

The persistent COVID-19 pandemic since 2020 has brought an enormous public health burden to the global society and is accompanied by various evolution of the virus genome. The consistently emerging SARS-CoV-2 variants harboring critical mutations impact the molecular characteristics of viral proteins and display heterogeneous behaviors in immune evasion, transmissibility, and the clinical manifestation during infection, which differ each strain and endow them with distinguished features during populational spread. Several SARS-CoV-2 variants, identified as Variants of Concern (VOC) by the World Health Organization, challenged global efforts on COVID-19 control due to the rapid worldwide spread and enhanced immune evasion from current antibodies and vaccines. Moreover, the recent Omicron variant even exacerbated the global anxiety in the continuous pandemic. Its significant evasion from current medical treatment and disease control even highlights the necessity of combinatory investigation of the mutational pattern and influence of the mutations on viral dynamics against populational immunity, which would greatly facilitate drug and vaccine development and benefit the global public health policymaking. Hence in this review, we summarized the molecular characteristics, immune evasion, and impacts of the SARS-CoV-2 variants and focused on the parallel comparison of different variants in mutational profile, transmissibility and tropism alteration, treatment effectiveness, and clinical manifestations, in order to provide a comprehensive landscape for SARS-CoV-2 variant research.


Assuntos
COVID-19 , SARS-CoV-2 , COVID-19/genética , Humanos , Evasão da Resposta Imune/genética , Pandemias , SARS-CoV-2/genética
17.
Nat Commun ; 13(1): 2674, 2022 05 13.
Artigo em Inglês | MEDLINE | ID: mdl-35562337

RESUMO

Emerging SARS-CoV-2 variants of concern (VOCs) harboring multiple mutations in the spike protein raise concerns on effectiveness of current vaccines that rely on the ancestral spike protein. Here, we design a quadrivalent mosaic nanoparticle vaccine displaying spike proteins from the SARS-CoV-2 prototype and 3 different VOCs. The mosaic nanoparticle elicits equivalent or superior neutralizing antibodies against variant strains in mice and non-human primates with only small reduction in neutralization titers against the ancestral strain. Notably, it provides protection against infection with prototype and B.1.351 strains in mice. These results provide a proof of principle for the development of multivalent vaccines against pandemic and potential pre-emergent SARS-CoV-2 variants.


Assuntos
COVID-19 , Nanopartículas , Animais , Anticorpos Neutralizantes , Anticorpos Antivirais , COVID-19/prevenção & controle , Vacinas contra COVID-19 , Camundongos , SARS-CoV-2/genética , Glicoproteína da Espícula de Coronavírus/genética , Vacinas Combinadas
18.
Food Funct ; 13(6): 3621-3631, 2022 Mar 21.
Artigo em Inglês | MEDLINE | ID: mdl-35262138

RESUMO

Mast cells (MCs) are the main effector cells in the onset of high-affinity receptor for IgE (FcεRI)-mediated allergic diseases. The aim of this study was to test whether dihydrocoumarin (DHC), a food flavoring agent derived from Melilotus officinalis, can block IgE-induced MC activation effects and to examine the potential molecular mechanisms by which DHC affects MC activation. Rat basophilic leukemia cells (RBLs) and mouse bone marrow-derived mast cells (BMMCs) were sensitized with anti-dinitrophenol (DNP) immunoglobulin (Ig)E antibodies, stimulated with DNP-human serum albumin antigen, and treated with DHC. Western blot analyses were performed to detect the expression of signaling proteins. Murine IgE-mediated passive cutaneous anaphylaxis (PCA) and ovalbumin (OVA)-induced active systemic anaphylaxis (ASA) models were used to examine DHC effects on allergic reactions in vivo. DHC inhibited MC degranulation, as evidenced by reduced ß-hexosaminidase activity and histamine levels, and reduced morphological changes associated with MC activation, namely cellular elongation and F-actin reorganization. DHC inhibited the activation of MAPK, NF-κB, and AP-1 pathways in IgE-activated MCs. Additionally, DHC could attenuate IgE/Ag-induced allergic reactions (dye extravasation and ear thickening) in PCA as well as OVA challenge-induced reactions in ASA mice (body temperature, serum histamine and IL-4 secretion changes). In conclusion, DHC suppressed MC activation. DHC may represent a new MC-suppressing treatment strategy for the treatment of IgE-mediated allergic diseases.


Assuntos
Anafilaxia , Mastócitos , Anafilaxia/tratamento farmacológico , Animais , Degranulação Celular , Aromatizantes/metabolismo , Imunoglobulina E/metabolismo , Inflamação/metabolismo , Camundongos , Anafilaxia Cutânea Passiva , Ratos
19.
Healthcare (Basel) ; 10(2)2022 Jan 25.
Artigo em Inglês | MEDLINE | ID: mdl-35206839

RESUMO

Although many studies on mental health have been conducted among various populations during the COVID-19 pandemic, few studies have focused on post-traumatic growth (PTG) in the general population. The current study aimed to explore whether perceived social support, personality, and coping strategies are associated with PTG in the COVID-19 pandemic period. The study also investigated whether coping strategies mediate the relations between perceived social support, personality, and PTG. A total of 181 participants (Mage = 24) completed the self-report questionnaire online, which was distributed via various online channels, mainly in China and Sweden. The relations between the study variables were examined with correlation analyses and a multiple mediation analysis. Results showed that more than half of the participants (60.8%) reported experiences of PTG during the pandemic. Additionally, perceived social support, personality traits (extraversion, emotional stability, agreeableness, and conscientiousness) and coping strategies (problem-focused coping, emotion-focused coping, and social support coping) were positively correlated with PTG. In addition, coping strategies (problem-focused coping, emotion-focused coping, and avoidance coping) mediated the relations between perceived social support, personality traits and PTG. Theoretical and practical implications of this study are discussed, concluding that the findings of this study have the potential to guide intervention efforts to promote positive change during the pandemic.

20.
Signal Transduct Target Ther ; 7(1): 42, 2022 02 08.
Artigo em Inglês | MEDLINE | ID: mdl-35136040

RESUMO

SARS-CoV-2 variants have evolved a variety of critical mutations, leading to antigenicity changes and immune escape. The recent emerging SARS-CoV-2 Omicron variant attracted global attention due to its significant resistance to current antibody therapies and vaccines. Here, we profiled the mutations of Omicron and other various circulating SARS-CoV-2 variants in parallel by computational interface analysis and in vitro experimental assays. We identified critical mutations that lead to antigenicity changes and diminished neutralization efficiency of a panel of 14 antibodies due to diverse molecular mechanisms influencing the antigen-antibody interaction. Our study identified that Omicron exhibited extraordinary potency in immune escape compared to the other variants of concern, and explores the application of computational interface analysis in SARS-CoV-2 mutation surveillance and demonstrates its potential for the early identification of concerning variants, providing preliminary guidance for neutralizing antibody therapy.


Assuntos
Anticorpos Neutralizantes/imunologia , Anticorpos Antivirais/imunologia , Antígenos Virais , COVID-19 , Evasão da Resposta Imune , SARS-CoV-2 , Antígenos Virais/genética , Antígenos Virais/imunologia , COVID-19/genética , COVID-19/imunologia , Células HEK293 , Humanos , SARS-CoV-2/genética , SARS-CoV-2/imunologia
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