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All Studies   Meta Analysis       

Chloroquine Inhibits the Release of Inflammatory Cytokines by Human Lung Explants

Grassin-Delyle et al., Clinical Infectious Diseases, doi:10.1093/cid/ciaa546
May 2020  
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HCQ for COVID-19
1st treatment shown to reduce risk in March 2020, now with p < 0.00000000001 from 419 studies, recognized in 46 countries.
No treatment is 100% effective. Protocols combine treatments.
5,100+ studies for 112 treatments. c19hcq.org
On human lung parenchymal explants, CQ concentration clinically achievable in the lung (100µM) inhibited the lipopolysaccharide-induced release of TNF-ɑ (by 76%), IL-6 (by 68%), CCL2 (by 72%), and CCL3 (by 67%). In addition to antiviral activity, CQ may also mitigate the cytokine storm associated with severe pneumonia caused by coronaviruses.
Grassin-Delyle et al., 8 May 2020, peer-reviewed, 8 authors.
Ex Vivo studies are an important part of preclinical research, however results may be very different in vivo.
This PaperHCQAll
Stanislas Grassin-Delyle, Hélène Salvator, Marion Brollo, Emilie Catherinot, Edouard Sage, Louis-Jean Couderc, Emmanuel Naline, Professor Philippe Devillier
doi:10.1093/cid/ciaa546/5831983
On human lung parenchymal explants, chloroquine concentration clinically achievable in the lung (100 M) inhibited the lipopolysaccharide-induced release of TNF-by 76%), IL-6 (by 68%), CCL2 (by 72%) and CCL3 (by 67%). Beside its antiviral activity, chloroquine might also mitigate the cytokine storm associated with severe pneumonia caused by coronaviruses.
A c c e p t e d M a n u s c r i p t 8 of 100 µM according to the lung-to-blood ratio in the pharmacokinetic model [12] . Hence, chloroquine treatment would preferably be initiated in the first days of lung symptoms caused by SARS-CoVs; first to reduce viral replication and then to mitigate the cytokine storm that typically occurs a few days later in last-stage disease. Given that chloroquine and hydroxychloroquine both appear to affect cytokine production by human monocytes and to accumulate in the lung in a similar way, they might exert the same effect on the cytokine storm [9, 12] . Although the in vitro effects on
References
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Channappanavar, Perlman, Pathogenic human coronavirus infections: causes and consequences of cytokine storm and immunopathology, Semin Immunopathol
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Huang, Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China, Lancet
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