Abstract

ACE2 and TMPRSS2 are key players on SARS-CoV-2 entry into host cells. However, it is still unclear whether expression levels of these factors could reflect disease severity. Here, a case–control study was conducted with 213 SARS-CoV-2 positive individuals where cases were defined as COVID-19 patients with respiratory distress requiring oxygen support (N = 38) and controls were those with mild to moderate symptoms of the disease who did not need oxygen therapy along the entire clinical course (N = 175). ACE2 and TMPRSS2 mRNA levels were evaluated in nasopharyngeal swab samples by RT-qPCR and logistic regression analyzes were applied to estimate associations with respiratory outcomes. ACE2 and TMPRSS2 levels positively correlated with age, which was also strongly associated with respiratory distress. Increased nasopharyngeal ACE2 levels showed a protective effect against this outcome (adjOR = 0.30; 95% CI 0.09–0.91), while TMPRSS2/ACE2 ratio was associated with risk (adjOR = 4.28; 95% CI 1.36–13.48). On stepwise regression, TMPRSS2/ACE2 ratio outperformed ACE2 to model COVID-19 severity. When nasopharyngeal swabs were compared to bronchoalveolar lavages in an independent cohort of COVID-19 patients under mechanical ventilation, similar expression levels of these genes were observed. These data suggest nasopharyngeal TMPRSS2/ACE2 as a promising candidate for further prediction models on COVID-19.

Highlights

  • angiotensin-converting enzyme 2 (ACE2) and TMPRSS2 are key players on SARS-CoV-2 entry into host cells

  • ACE2 and TMPRSS2 are associated with respiratory distress susceptibility on COVID-19 patients, 213 SARSCoV-2 RT-quantitative PCR (qPCR) positive individuals were enrolled in this case–control study

  • Cases were defined as COVID-19 patients who required oxygen support over the course of SARS-CoV-2 infection while controls were COVID19 patients that presented only mild symptoms of the disease

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Summary

Introduction

ACE2 and TMPRSS2 are key players on SARS-CoV-2 entry into host cells. it is still unclear whether expression levels of these factors could reflect disease severity. When nasopharyngeal swabs were compared to bronchoalveolar lavages in an independent cohort of COVID-19 patients under mechanical ventilation, similar expression levels of these genes were observed. These data suggest nasopharyngeal TMPRSS2/ACE2 as a promising candidate for further prediction models on COVID-19. Some infected individuals may develop intense respiratory distress, pulmonary infiltrates, and secondary bacterial ­pneumonia[2] This scenario can evolve to an even more critical condition of respiratory failure, septic shock and multi-organ ­disfunction[2]. ACE2 deficiency has been linked to exacerbation of adipose tissue inflammation upon high calorie diet induced obesity in mice, reinforcing its potential anti-inflammatory e­ ffects[13]

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