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Assessing multi-target antiviral and antioxidant activities of natural compounds against SARS-CoV-2: an integrated in vitro and in silico study

Al balawi et al., Bioresources and Bioprocessing, doi:10.1186/s40643-024-00822-z
Nov 2024  
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Curcumin for COVID-19
15th treatment shown to reduce risk in February 2021, now with p = 0.0000000096 from 27 studies.
No treatment is 100% effective. Protocols combine treatments.
5,100+ studies for 110 treatments. c19early.org
In Vitro and In Silico study showing that propolis, curcumin, quercetin, and ginseng compounds inhibit SARS-CoV-2 infection and bind to key viral proteins. In Vero CCL-81 cells, propolis and curcumin significantly reduced SARS-CoV-2 viral titer, while quercetin and ginseng required higher concentrations for antiviral effects. Molecular docking predicted that the compounds bind to the SARS-CoV-2 main protease, spike protein, and RNA-directed RNA polymerase. Propolis also reduced inflammatory cytokines TNF-α, IL-1β, and IL-10 in infected cells. The compounds demonstrated strong antioxidant activity, with propolis showing the highest potency.
51 preclinical studies support the efficacy of curcumin for COVID-19:
In Silico studies predict inhibition of SARS-CoV-2 with curcumin or metabolites via binding to the spikeA,2,7,12,14,20,23,44 (and specifically the receptor binding domainB,10,13,16), MproC,2,7,9,11-13,15,16,18,21,23,24,26,40,44, RNA-dependent RNA polymeraseD,2,13,22,44, PLproE,2, ACE2F,14,15,17, nucleocapsidG,8,25, nsp10H,25, and helicaseI,29 proteins. In Vitro studies demonstrate inhibition of the spikeA,34 (and specifically the receptor binding domainB,43), MproC,19,34,40,42, ACE2F,43, and TMPRSS2J,43 proteins, and inhibition of spike-ACE2 interactionK,27. In Vitro studies demonstrate efficacy in Calu-3L,41, A549M,34, 293TN,3, HEK293-hACE2O,19,32, 293T/hACE2/TMPRSS2P,33, Vero E6Q,9,13,23,32,34,36,37,39,41, and SH-SY5YR,31 cells. Curcumin is predicted to inhibit the interaction between the SARS-CoV-2 spike protein receptor binding domain and the human ACE2 receptor for the delta and omicron variants10, decreases pro-inflammatory cytokines induced by SARS-CoV-2 in peripheral blood mononuclear cells39, alleviates SARS-CoV-2 spike protein-induced mitochondrial membrane damage and oxidative stress3, may limit COVID-19 induced cardiac damage by inhibiting the NF-κB signaling pathway which mediates the profibrotic effects of the SARS-CoV-2 spike protein on cardiac fibroblasts45, and inhibits SARS-CoV-2 ORF3a ion channel activity, which contributes to viral pathogenicity and cytotoxicity35.
Study covers propolis, quercetin, and curcumin.
Al balawi et al., 27 Nov 2024, peer-reviewed, 5 authors. Contact: an.albalawi@ut.edu.sa, dr.prof2011@gmail.com.
In Vitro studies are an important part of preclinical research, however results may be very different in vivo.
This PaperCurcuminAll
Assessing multi-target antiviral and antioxidant activities of natural compounds against SARS-CoV-2: an integrated in vitro and in silico study
Aisha Nawaf Al Balawi, Jayda G Eldiasty, Sahar Abd-El Razik Mosallam, Alaa R El-Alosey, Alaa Elmetwalli
Bioresources and Bioprocessing, doi:10.1186/s40643-024-00822-z
There is an urgent need for preventive and therapeutic drugs to effectively treat and prevent viral diseases from resurfacing as they emerge during the COVID-19 pandemic. This study aims to assess the antiviral effects of four natural compounds commonly used in traditional medicine to treat SARS-CoV-2 infection. A cytotoxicity, dose-dependent, and plaque reduction assay was performed on Vero CCL-81 cells to figure out their effects on the cells. Quantification of cytokines was assessed. In silico analysis for the selected compound was also evaluated. Results revealed that the compounds could disrupt the viral replication cycle through direct inhibition of the virus or immune system stimulation. The cytotoxicity assay results revealed that the compounds were well tolerated by the cells, indicating that the compounds were not toxic to the cells. This study evaluated the antioxidant capacities of propolis, curcumin, quercetin, and ginseng using ABTS, FRAP, and CUPRAC assays, revealing that propolis exhibited the highest antioxidant activity of ABTS with 1250.40 ± 17.10 μmol Trolox eq/g, with FRAP values reaching 1200.55 ± 15.90 μmol Fe 2 ⁺ eq/g and CUPRAC values of 1150.80 ± 14.20 μmol Trolox eq/g at 1000 µg/mL, highlighting its potential as a potent natural antioxidant. The results of the plaque reduction assay revealed that the compounds could reduce the size and number of plaques, indicating that the compounds could inhibit the virus replication cycle. Subsequently, using molecular docking to analyze the effect of propolis, curcumin, quercetin, and ginseng as inhibitors, it was unveiled that the four compounds are likely to have the potential to inhibit the protease activity, spike protein S1, and RNA polymerase of SARS-CoV-2 and the virus titer was reduced by 100% after post-infection using propolis as an inhibitor control.
Author contributions Conceptualization, Aisha Nawaf Al balawi, Alaa Elmetwalli, Jayda G. Eldiasty; formal analysis, Alaa Elmetwalli, Sahar Abd-El Razik Mosallam, Alaa R. El-Alosey; investigation, Alaa Elmetwalli, Aisha Nawaf Al balawi, Jayda G. Eldiasty, Sahar Abd-El Razik Mosallam; project administration, Alaa Elmetwalli, Aisha Nawaf Al balawi, Jayda G. Eldiasty, Sahar Abd-El Razik Mosallam, Alaa R. El-Alosey; Software, Alaa Elmetwalli, Jayda G. Eldiasty; validation Alaa Elmetwalli, Aisha Nawaf Al balawi; Visualization, Alaa Elmetwalli; writing-original draft, Alaa Elmetwalli; writing-review, editing, and provided critical feedback to help shape the research, analysis, and manuscript, Alaa Elmetwalli; All authors have read and agreed to the published version of the manuscript. Declarations Ethics approval consent to participate Not applicable. Consent for publication Not applicable. Competing interests The authors declare no competing interests. Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
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