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Inhibition of SARS-CoV-2 Mpro with Vitamin C, L-Arginine and a Vitamin C/L-Arginine Combination

Đukić et al., Frontiers in Bioscience-Landmark, doi:10.31083/j.fbl2801008

Jan 2023

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Vitamin C for COVID-19

6th treatment shown to reduce risk in September 2020

^*, now known with p = 0.000000087 from 70 studies, recognized in 11 countries.

Lower risk for mortality, ICU admission, hospitalization, and recovery.

No treatment is 100% effective. Protocols combine complementary and synergistic treatments. ^* >10% efficacy in meta analysis with ≥3 clinical studies.

4,100+ studies for 60+ treatments. c19early.org

In Vitro study showing inhibition of SARS-CoV-2 M^pro with vitamin C, L-arginine, and improved inhibition with the combination of both.

12 preclinical studies support the efficacy of vitamin C for COVID-19:

5 In Silico studies Alkafaas, Kumar, Malla, Morales-Bayuelo, Pandya

6 In Vitro studies Goc, Hajdrik, Malla, Moatasim, Zuo, Đukić

1 In Vivo animal study Zuo

Vitamin C has been identified by the European Food Safety Authority (EFSA) as having sufficient evidence for a causal relationship between intake and optimal immune system function EFSA, Galmés, Galmés (B). Vitamin C plays a key role in the immune system, supporting the production and function of leukocytes, or white blood cells, which defend against infection and disease, including the production of lymphocytes, which make antibodies, and enhancing phagocytosis, the process by which immune system cells ingest and destroy viruses and infected cells. Vitamin C is an antioxidant, protecting cells from damage caused by free radicals. Vitamin C inhibits SARS-CoV-2 3CL^pro Malla, Đukić and inhibits SARS-CoV-2 infection by reducing ACE2 levels in a dose-dependent manner Zuo. Intracellular levels of vitamin C decline during COVID-19 hospitalization suggesting ongoing utilization and depletion of vitamin C Boerenkamp. Threonic acid, a metabolite of vitamin C, is lower in mild and severe cases, consistent with increased need for and metabolization of vitamin C with moderate infection, but more limited ability to produce threonic acid in severe infection due to depletion or existing lower levels of vitamin C Albóniga. Symptomatic COVID-19 is associated with a lower frequency of natural killer (NK) cells, and vitamin C has been shown to improve NK cell numbers and functioning Graydon, Vojdani.

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1. Albóniga et al., Differential abundance of lipids and metabolites related to SARS-CoV-2 infection and susceptibility, Scientific Reports, doi:10.1038/s41598-023-40999-5.nature.com, doi.org.

2. Alkafaas et al., A study on the effect of natural products against the transmission of B.1.1.529 Omicron, Virology Journal, doi:10.1186/s12985-023-02160-6.biomedcentral.com, doi.org.

3. Boerenkamp et al., Low Levels of Serum and Intracellular Vitamin C in Hospitalized COVID-19 Patients, Nutrients, doi:10.3390/nu15163653.mdpi.com, doi.org.

4. Đukić et al., Inhibition of SARS-CoV-2 Mpro with Vitamin C, L-Arginine and a Vitamin C/L-Arginine Combination, Frontiers in Bioscience-Landmark, doi:10.31083/j.fbl2801008.imrpress.com, doi.org.

5. EFSA, Scientific Opinion on the substantiation of health claims related to vitamin C and protection of DNA, proteins and lipids from oxidative damage (ID 129, 138, 143, 148), antioxidant function of lutein (ID 146), maintenance of vision (ID 141, 142), collagen formation (ID 130, 131, 136, 137, 149), function of the nervous system (ID 133), function of the immune system (ID 134), function of the immune system during and after extreme physical exercise (ID 144), non-haem iron absorption (ID 132, 147), energy-yielding metabolism (ID 135), and relief in case of irritation in the upper respiratory tract (ID 1714, 1715) pursuant to Article 13(1) of Regulation (EC) No 1924/2006, EFSA Journal, doi:10.2903/j.efsa.2009.1226.europa.eu, doi.org.

6. Galmés et al., Suboptimal Consumption of Relevant Immune System Micronutrients Is Associated with a Worse Impact of COVID-19 in Spanish Populations, Nutrients, doi:10.3390/nu14112254.mdpi.com, doi.org.

7. Galmés (B) et al., Current State of Evidence: Influence of Nutritional and Nutrigenetic Factors on Immunity in the COVID-19 Pandemic Framework, Nutrients, doi:10.3390/nu12092738.mdpi.com, doi.org.

8. Goc et al., Inhibitory effects of specific combination of natural compounds against SARS-CoV-2 and its Alpha, Beta, Gamma, Delta, Kappa, and Mu variants, European Journal of Microbiology and Immunology, doi:10.1556/1886.2021.00022.akjournals.com, doi.org.

9. Graydon et al., High baseline frequencies of natural killer cells are associated with asymptomatic SARS-CoV-2 infection, Current Research in Immunology, doi:10.1016/j.crimmu.2023.100064.sciencedirect.com, doi.org.

10. Hajdrik et al., In Vitro Determination of Inhibitory Effects of Humic Substances Complexing Zn and Se on SARS-CoV-2 Virus Replication, Foods, doi:10.3390/foods11050694.mdpi.com, doi.org.

11. Kumar et al., In silico virtual screening-based study of nutraceuticals predicts the therapeutic potentials of folic acid and its derivatives against COVID-19, VirusDisease, doi:10.1007/s13337-020-00643-6.springer.com, doi.org.

12. Malla et al., Vitamin C inhibits SARS coronavirus-2 main protease essential for viral replication, bioRxiv, doi:10.1101/2021.05.02.442358.biorxiv.org, doi.org.

13. Moatasim et al., Potent Antiviral Activity of Vitamin B12 against Severe Acute Respiratory Syndrome Coronavirus 2, Middle East Respiratory Syndrome Coronavirus, and Human Coronavirus 229E, Microorganisms, doi:10.3390/microorganisms11112777.mdpi.com, doi.org.

14. Morales-Bayuelo et al., New findings on ligand series used as SARS-CoV-2 virus inhibitors within the frameworks of molecular docking, molecular quantum similarity and chemical reactivity indices, F1000Research, doi:10.12688/f1000research.123550.3.f1000research.com, doi.org.

15. Pandya et al., Unravelling Vitamin B12 as a potential inhibitor against SARS-CoV-2: A computational approach, Informatics in Medicine Unlocked, doi:10.1016/j.imu.2022.100951.sciencedirect.com, doi.org.

16. Vojdani et al., In vivo effect of ascorbic acid on enhancement of human natural killer cell activity, Nutrition Research, doi:10.1016/S0271-5317(05)80799-7.sciencedirect.com, doi.org.

17. Zuo et al., Vitamin C promotes ACE2 degradation and protects against SARS‐CoV‐2 infection, EMBO reports, doi:10.15252/embr.202256374.wiley.com, doi.org.

Đukić et al., 13 Jan 2023, peer-reviewed, 9 authors. Contact: sanja@vinca.rs (corresponding author).

In Vitro studies are an important part of preclinical research, however results may be very different in vivo.

This Paper Vitamin C All

Inhibition of SARS-CoV-2 Mpro with Vitamin C, L-Arginine and a Vitamin C/L-Arginine Combination

Ivana Đukić, Nevena Kaličanin, Milan Sencanski, Snezana B Pajovic, Jelena Milicevic, Jelena Prljic, Slobodan Paessler, Radivoje Prodanović, Sanja Glisic

Frontiers in Bioscience-Landmark, doi:10.31083/j.fbl2801008

Background: Drug resistance is a critical problem in health care that affects therapy outcomes and requires new approaches to drug design. SARS-CoV-2 M pro mutations are of concern as they can potentially reduce therapeutic efficacy. Viral infections are amongst the many disorders for which nutraceuticals have been employed as an adjunct therapy. The aim of this study was to examine the potential in vitro activity of L-arginine and vitamin C against SARS-CoV-2 M pro . Methods: The M pro inhibition assay was developed by cloning, expression, purification, and characterization of M pro . Selected compounds were then screened for protease inhibition. Results: Larginine was found to be active against SARS-CoV-2 M pro , while a vitamin C/L-arginine combination had a synergistic antiviral action against M pro . These findings confirm the results of our previous in silico repurposing study that showed L-arginine and vitamin C were potential M pro inhibitors. Moreover, they suggest a possible molecular mechanism to explain the beneficial effect of arginine in COVID patients. Conclusions: The findings of the current study are important because they help to identify COVID-19 treatments that are efficient, inexpensive, and have a favorable safety profile. The results of this study also suggest a possible adjuvant nutritional strategy for COVID-19 that could be used in conjunction with pharmacological agents.

Author Contributions Conceptualization-RP, SP and SG; performed the experiments-RP, NK, and IĐ; validation-NK, and RP; analyzed the data-NK, IĐ, MS, and RP; investigation-NK, IĐ, and MS; resources-RP; writing, original draft preparation-RP, SG, MS, SBP, JM and JP; writing, review and editing-SG, SBP, MS, SP and RP; visualization-IĐ, NK, RP; supervision-RP; project administration-RP, SG, JM, and MS. All authors contributed to editorial changes in the manuscript. All authors read and approved the final manuscript. Ethics Approval and Consent to Participate Not applicable. Conflict of Interest The authors declare no conflict of interest.

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