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10.1007/s10875-020-00920-5

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33387156!7775842!33387156
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suck abstract from ncbi


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pmid33387156      J+Clin+Immunol 2021 ; 41 (3): 515-525
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  • SARS-CoV-2-Induced ARDS Associates with MDSC Expansion, Lymphocyte Dysfunction, and Arginine Shortage #MMPMID33387156
  • Reizine F; Lesouhaitier M; Gregoire M; Pinceaux K; Gacouin A; Maamar A; Painvin B; Camus C; Le Tulzo Y; Tattevin P; Revest M; Le Bot A; Ballerie A; Cador-Rousseau B; Lederlin M; Lebouvier T; Launey Y; Latour M; Verdy C; Rossille D; Le Gallou S; Dulong J; Moreau C; Bendavid C; Roussel M; Cogne M; Tarte K; Tadie JM
  • J Clin Immunol 2021[Apr]; 41 (3): 515-525 PMID33387156show ga
  • PURPOSE: The SARS-CoV-2 infection can lead to a severe acute respiratory distress syndrome (ARDS) with prolonged mechanical ventilation and high mortality rate. Interestingly, COVID-19-associated ARDS share biological and clinical features with sepsis-associated immunosuppression since lymphopenia and acquired infections associated with late mortality are frequently encountered. Mechanisms responsible for COVID-19-associated lymphopenia need to be explored since they could be responsible for delayed virus clearance and increased mortality rate among intensive care unit (ICU) patients. METHODS: A series of 26 clinically annotated COVID-19 patients were analyzed by thorough phenotypic and functional investigations at days 0, 4, and 7 after ICU admission. RESULTS: We revealed that, in the absence of any difference in demographic parameters nor medical history between the two groups, ARDS patients presented with an increased number of myeloid-derived suppressor cells (MDSC) and a decreased number of CD8(pos) effector memory cell compared to patients hospitalized for COVID-19 moderate pneumonia. Interestingly, COVID-19-related MDSC expansion was directly correlated to lymphopenia and enhanced arginase activity. Lastly, T cell proliferative capacity in vitro was significantly reduced among COVID-19 patients and could be restored through arginine supplementation. CONCLUSIONS: The present study reports a critical role for MDSC in COVID-19-associated ARDS. Our findings open the possibility of arginine supplementation as an adjuvant therapy for these ICU patients, aiming to reduce immunosuppression and help virus clearance, thereby decreasing the duration of mechanical ventilation, nosocomial infection acquisition, and mortality.
  • |*SARS-CoV-2[MESH]
  • |Aged[MESH]
  • |Arginine/*metabolism[MESH]
  • |COVID-19/*complications[MESH]
  • |Cross Infection/etiology[MESH]
  • |Female[MESH]
  • |Humans[MESH]
  • |Lymphopenia/*etiology[MESH]
  • |Male[MESH]
  • |Middle Aged[MESH]
  • |Myeloid-Derived Suppressor Cells/*physiology[MESH]
  • |Prospective Studies[MESH]
  • |Respiratory Distress Syndrome/etiology/*immunology/metabolism[MESH]


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