Table_1_Lung Neutrophilic Recruitment and IL-8/IL-17A Tissue Expression in COVID-19.docx (33.35 kB)
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Table_1_Lung Neutrophilic Recruitment and IL-8/IL-17A Tissue Expression in COVID-19.docx

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posted on 31.03.2021, 07:13 authored by Marina Luise Viola Azevedo, Aline Cristina Zanchettin, Caroline Busatta Vaz de Paula, Jarbas da Silva Motta Júnior, Mineia Alessandra Scaranello Malaquias, Sonia Mara Raboni, Plínio Cezar Neto, Rafaela Chiuco Zeni, Amanda Prokopenko, Nícolas Henrique Borges, Thiago Mateus Godoy, Ana Paula Kubaski Benevides, Daiane Gavlik de Souza, Cristina Pellegrino Baena, Cleber Machado-Souza, Lucia de Noronha

The new SARS-CoV-2 virus differs from the pandemic Influenza A virus H1N1 subtype (H1N1pmd09) how it induces a pro-inflammatory response in infected patients. This study aims to evaluate the involvement of SNPs and tissue expression of IL-17A and the neutrophils recruitment in post-mortem lung samples from patients who died of severe forms of COVID-19 comparing to those who died by H1N1pdm09. Twenty lung samples from patients SARS-CoV-2 infected (COVID-19 group) and 10 lung samples from adults who died from a severe respiratory H1N1pdm09 infection (H1N1 group) were tested. The tissue expression of IL-8/IL-17A was identified by immunohistochemistry, and hematoxylin and eosin (H&E) stain slides were used for neutrophil scoring. DNA was extracted from paraffin blocks, and genotyping was done in real time-PCR for two IL17A target polymorphisms. Tissue expression increasing of IL-8/IL-17A and a higher number of neutrophils were identified in samples from the H1N1 group compared to the COVID-19 group. The distribution of genotype frequencies in the IL17A gene was not statistically significant between groups. However, the G allele (GG and GA) of rs3819025 was correlated with higher tissue expression of IL-17A in the COVID-19 group. SARS-CoV-2 virus evokes an exacerbated response of the host’s immune system but differs from that observed in the H1N1pdm09 infection since the IL-8/IL-17A tissue expression, and lung neutrophilic recruitment may be decreased. In SNP rs3819025 (G/A), the G allele may be considered a risk allele in the patients who died for COVID-19.