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  • Yoshiji, Satoshi, et al. (författare)
  • Proteome-wide Mendelian randomization implicates nephronectin as an actionable mediator of the effect of obesity on COVID-19 severity
  • 2023
  • Ingår i: Nature Metabolism. - : Springer Nature. - 2522-5812. ; 5, s. 248-264
  • Tidskriftsartikel (refereegranskat)abstract
    • How obesity contributes to COVID-19 severity is not fully understood. In this study, Yoshiji et al. found that the plasma protein nephronectin partially mediates the effect of obesity on the risk of COVID-19 severity using a two-step Mendelian randomization approach and omics analyses. Obesity is a major risk factor for Coronavirus disease (COVID-19) severity; however, the mechanisms underlying this relationship are not fully understood. As obesity influences the plasma proteome, we sought to identify circulating proteins mediating the effects of obesity on COVID-19 severity in humans. Here, we screened 4,907 plasma proteins to identify proteins influenced by body mass index using Mendelian randomization. This yielded 1,216 proteins, whose effect on COVID-19 severity was assessed, again using Mendelian randomization. We found that an s.d. increase in nephronectin (NPNT) was associated with increased odds of critically ill COVID-19 (OR = 1.71, P = 1.63 x 10(-10)). The effect was driven by an NPNT splice isoform. Mediation analyses supported NPNT as a mediator. In single-cell RNA-sequencing, NPNT was expressed in alveolar cells and fibroblasts of the lung in individuals who died of COVID-19. Finally, decreasing body fat mass and increasing fat-free mass were found to lower NPNT levels. These findings provide actionable insights into how obesity influences COVID-19 severity.
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