RESUMO
BACKGROUND AND AIMS: Influenza viruses cause respiratory infection in humans and result in substantial illness, death, and economic burden. To date, however, the mechanisms by which these viruses cause disease are not fully understood. METHODS: To investigate the proteomic profile of children infected with seasonal influenza A virus, nasal aspirates derived from children (n = 12) experiencing flu symptoms caused by seasonal influenza A virus were analyzed using two-dimensional electrophoresis (2-DE). Control nasal samples were taken from the same group of children 8-10 weeks later when they were symptom free. RESULTS: Analysis of the 2-DE gels revealed eight spots differentially expressed, which were further analyzed using mass spectrometry. Ten proteins were found to be differentially upregulated in the infected children including PLUNC, cystatin S, cystatin SA, S100A9, lipocalin 1 fragments (n = 2), truncated lactotransferrin, two immunoglobulin (Ig) kappa fragments and one immunoglobulin (Ig) lambda fragment. CONCLUSIONS: Our findings reveal that the composition of nasal secretions in influenza virus respiratory infections is different from that when children are healthy and may provide further insights into the pathogenesis of respiratory infections caused by seasonal influenza A viruses.
Assuntos
Vírus da Influenza A/imunologia , Influenza Humana/imunologia , Proteômica , Estações do Ano , Criança , Eletroforese em Gel Bidimensional , Ensaio de Imunoadsorção Enzimática , Humanos , Vírus da Influenza A/isolamento & purificação , Influenza Humana/metabolismo , Influenza Humana/virologia , Espectrometria de MassasRESUMO
The aim of this work was to determine the presence of galectin-10 in nasal lavage fluid (NLF) of patients with aspirin-sensitive respiratory disease (ASRD) before and after challenge with L-ASA (aspirin) by ELISA. Fifteen ASRD patients, ten aspirin-tolerant asthmatics (ATA), and fifteen healthy controls (HC) were studied. The baseline presence of Galectin-10 in PBMC was determined using real time PCR. Galectin-10 was evaluated in tissue of nasal polyps by western blot. Our results showed a lower expression in PBMC of ASRD patients than in ATA and healthy controls. However, a higher concentration of galectin-10 in NLF was found in ASRD patients before and after L-ASA challenge; western blot confirmed a high expression of galectin-10 in tissue from nasal polyps obtained from ASRD patients. Our results suggest a probable role of galectin-10 in the inflammatory response observed in ASRD patients; however, confirmatory studies are needed.