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10.1007/s00210-022-02210-w

http://scihub22266oqcxt.onion/10.1007/s00210-022-02210-w
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35099571!8802291!35099571
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suck abstract from ncbi


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pmid35099571      Naunyn+Schmiedebergs+Arch+Pharmacol 2022 ; 395 (4): 487-494
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  • Vitamin D can reduce severity in COVID-19 through regulation of PD-L1 #MMPMID35099571
  • Aygun H
  • Naunyn Schmiedebergs Arch Pharmacol 2022[Apr]; 395 (4): 487-494 PMID35099571show ga
  • COVID-19 is a highly contagious viral infection that has killed millions of people around the world. The most important diagnostic feature of COVID-19 is lymphocyte depletion, particularly the depletion of T cells. In COVID-19 infections, there is a link between destruction of T cells and increased expression of inhibitory immune checkpoint molecules (PD-1/PD-L1) on T cell surfaces. It was shown that PD-1/PD-L1 levels increase in severely COVID-19 infected individuals. Higher proinflammatory cytokine levels cause increased PD-1/PD-L1 expression. In severe COVID-19, higher proinflammatory cytokine levels may increase PD-1/PD-L1. Vitamin-D is an important immune regulator. It is known that the numbers of CD4(+) and CD8(+) T lymphocytes decrease in vitamin D deficiency while vitamin D supplementation increases CD + 4 lymphocytes. Vitamin D can increase regulatory T cell (Treg) activity. Vitamin D also has a diminishing effect on proinflammatory cytokines. In severe COVID-19 cases, vitamin D supplementation may inhibit the increase of PD-L1 expression through reducing proinflammatory cytokine levels. Thus, vitamin D supplementation could eliminate the suppressive effect of PD-L1 on CD4(+) and CD8(+) T cells, preventing lymphopenia and reducing disease severity and mortality in patients infected with COVID-19. Besides, vitamin D supplementation can reduce inflammation by increasing Treg activity. The aim of this letter is to discuss the functions of inhibitory immune checkpoint molecules and their effects on dysfunction and depletion of T-cells as well as to explain the possible modulatory effect of vitamin D on these checkpoints and T cells.
  • |*COVID-19 Drug Treatment[MESH]
  • |Animals[MESH]
  • |B7-H1 Antigen/drug effects/*metabolism[MESH]
  • |COVID-19/immunology[MESH]
  • |Cytokines/metabolism[MESH]
  • |Humans[MESH]


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