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Inhibition of the SARS-CoV-2 3CLpro main protease by plant polyphenols

Bahun et al., Food Chemistry, doi:10.1016/j.foodchem.2021.131594
Nov 2021  
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Quercetin for COVID-19
24th treatment shown to reduce risk in July 2021
*, now known with p = 0.0031 from 11 studies.
No treatment is 100% effective. Protocols combine complementary and synergistic treatments. * >10% efficacy in meta analysis with ≥3 clinical studies.
3,800+ studies for 60+ treatments.
In Silico and In Vitro study of plant polyphenols identifying quercetin, curcumin, ellagic acid, epigallocatechin gallate, and resveratrol as SARS-CoV-2 3CLpro inhibitors with IC50 between 11.8µM and 23.4µM. Real-time binding was analyzed with surface plasmon resonance spectroscopy.
In Silico studies predict inhibition of SARS-CoV-2, or minimization of side effects, with quercetin or metabolites via binding to the spike Note A, Alavi, Azmi (B), Chandran, Kandeil, Mandal, Moschovou, Nguyen, Pan, Thapa (B), Şimşek, Mpro Note B, Akinwumi, Alanzi, Ibeh, Kandeil, Mandal, Moschovou, Nguyen, Qin, Rehman, Sekiou (B), Singh, Thapa (B), Wang, Zhang, RNA-dependent RNA polymerase Note C, Corbo, PLpro Note D, Ibeh, Zhang, ACE2 Note E, Chandran, Ibeh, Qin, Thapa (B), Şimşek, Alkafaas, TMPRSS2 Note F, Chandran, helicase Note G, Alanzi, Singh (B), endoribonuclease Note H, Alavi, cathepsin L Note I, Ahmed, Wnt-3 Note J, Chandran, FZD Note K, Chandran, LRP6 Note L, Chandran, ezrin Note M, Chellasamy, ADRP Note N, Nguyen, NRP1 Note O, Şimşek, PTGS2 Note P, Qin, HSP90AA1 Note Q, Qin, matrix metalloproteinase 9 Note R, Sai Ramesh, IL-6 Note S, Yang, Yang (B), IL-10 Note T, Yang, VEGFA Note U, Yang (B), and RELA Note V, Yang (B) proteins. In Vitro studies demonstrate efficacy in Calu-3 Note W, DiGuilio, A549 Note X, Yang, HEK293-ACE2+ Note Y, Singh (C), Huh-7 Note Z, Pan, Caco-2 Note AA, Roy, Vero E6 Note AB, Kandeil, El-Megharbel, Roy, mTEC Note AC, Wu, and RAW264.7 Note AD, Wu cells. Animal studies demonstrate efficacy in K18-hACE2 mice Note AE, Aguado, db/db mice Note AF, Wu, Wu (B), BALB/c mice Note AG, Shaker, and rats El-Megharbel (B). Quercetin reduced proinflammatory cytokines and protected lung and kidney tissue against LPS-induced damage in mice Shaker.
Study covers quercetin and curcumin.
Bahun et al., 14 Nov 2021, peer-reviewed, 10 authors.
In Vitro studies are an important part of preclinical research, however results may be very different in vivo.
This PaperQuercetinAll
Inhibition of the SARS-CoV-2 3CLpro main protease by plant polyphenols
Miha Bahun, Marko Jukić, Domen Oblak, Luka Kranjc, Gregor Bajc, Matej Butala, Krištof Bozovičar, Tomaž Bratkovič, Črtomir Podlipnik, Nataša Poklar Ulrih
Food Chemistry, doi:10.1016/j.foodchem.2021.131594
This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Conflicts of interest: The authors declare that they have no conflicts of interest. Appendix A. Supplementary material
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