Bracing NK cell based therapy to relegate pulmonary inflammation in COVID-19

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A2 Katsausartikkeli tieteellisessä aikakauslehdessä
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Heliyon, Volume 7, issue 7
The contagiosity of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has startled mankind and has brought our lives to a standstill. The treatment focused mainly on repurposed immunomodulatory and antiviral agents along with the availability of a few vaccines for prophylaxis to vanquish COVID-19. This seemingly mandates a deeper understanding of the disease pathogenesis. This necessitates a plausible extrapolation of cell-based therapy to COVID-19 and is regarded equivalently significant. Recently, correlative pieces of clinical evidence reported a robust decline in lymphocyte count in severe COVID-19 patients that suggest dysregulated immune responses as a key element contributing to the pathophysiological alterations. The large granular lymphocytes also known as natural killer (NK) cells play a heterogeneous role in biological functioning wherein their frontline action defends the body against a wide array of infections and tumors. They prominently play a critical role in viral clearance and executing immuno-modulatory activities. Accumulated clinical evidence demonstrate a decrease in the number of NK cells in circulation with or without phenotypical exhaustion. These plausibly contribute to the progression of pulmonary inflammation in COVID-19 pneumonia and result in acute lung injury. In this review, we have outlined the present understanding of the immunological response of NK cells in COVID-19 infection. We have also discussed the possible use of these powerful biological cells as a therapeutic agent in view of preventing immunological harms of SARS-CoV-2 and the current challenges in advocating NK cell therapy for the same.
Funding Information: We thank Dr. Prajwal GS, Junior Resident of Orthopedics, JJM Medical College, Davangere, Karnataka, India for the literature search regarding COVID-19. Publisher Copyright: © 2021
COVID-19, Cytokines, Natural killer cells, Pulmonary inflammation, SARS-CoV-2
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Jeyaraman , M , Muthu , S , Bapat , A , Jain , R , Sushmitha , E S , Gulati , A , Channaiah Anudeep , T , Dilip , S J , Jha , N K , Kumar , D , Kesari , K K , Ojha , S , Dholpuria , S , Gupta , G , Dureja , H , Chellappan , D K , Singh , S K , Dua , K & Jha , S K 2021 , ' Bracing NK cell based therapy to relegate pulmonary inflammation in COVID-19 ' , Heliyon , vol. 7 , no. 7 , 07635 .