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Retinoic Acid-Mediated Inhibition of Mouse Coronavirus Replication Is Dependent on IRF3 and CaMKK

Franco et al., Viruses, doi:10.3390/v16010140

Jan 2024

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Vitamin A for COVID-19

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Mouse study showing inhibition of mouse coronavirus replication with all-trans retinoic acid (RA), a metabolite of vitamin A. Authors find that RA confers protection against infection by activating interferon responses in an IRF3-dependent manner, with reduced viral titers and nucleocapsid expression. RA induction of antiviral genes also relies on calcium/calmodulin kinase kinase (CaMKK) activity. The results demonstrate RA's potential as an antiviral therapeutic against coronaviruses through stimulation of innate immunity.

10 preclinical studies support the efficacy of vitamin A for COVID-19:

4 In Silico studies Chakraborty, Huang, Li, Pandya

5 In Vitro studies DiGuilio, Huang, Moatasim, Morita, Tong

1 In Vivo animal study Franco

Vitamin A 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 A has potent antiviral activity against SARS-CoV-2 in both human cell lines and human organoids of the lower respiratory tract (active metabolite all-trans retinoic acid, ATRA) Tong, is predicted to bind critical host and viral proteins for SARS-CoV-2 and may compensate for gene expression changes related to SARS-CoV-2 Chakraborty, Huang, Pandya, may be beneficial for COVID-19 via antiviral, anti-inflammatory, and immunomodulatory effects according to network pharmacology analysis Li, reduces barrier compromise caused by TNF-α in Calu-3 cells DiGuilio, inhibits mouse coronavirus replication Franco, may stimulate innate immunity by activating interferon responses in an IRF3-dependent manner (ATRA) Franco, may reduce excessive inflammation induced by SARS-CoV-2 Huang, shows SARS-CoV-2 antiviral activity In Vitro Huang, Moatasim, Morita, is effective against multiple SARS-CoV-2 variants in Calu-3 cells Morita, and inhibits the entry and replication of SARS-CoV-2 via binding to ACE2 / 3CLpro / RdRp / helicase / 3′-to-5′ exonuclease Huang.

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1. Chakraborty et al., In-silico screening and in-vitro assay show the antiviral effect of Indomethacin against SARS-CoV-2, Computers in Biology and Medicine, doi:10.1016/j.compbiomed.2022.105788.sciencedirect.com, doi.org.

2. DiGuilio et al., The multiphasic TNF-α-induced compromise of Calu-3 airway epithelial barrier function, Experimental Lung Research, doi:10.1080/01902148.2023.2193637.tandfonline.com, doi.org.

3. EFSA, Scientific Opinion on the substantiation of health claims related to vitamin A and cell differentiation (ID 14), function of the immune system (ID 14), maintenance of skin and mucous membranes (ID 15, 17), maintenance of vision (ID 16), maintenance of bone (ID 13, 17), maintenance of teeth (ID 13, 17), maintenance of hair (ID 17), maintenance of nails (ID 17), metabolism of iron (ID 206), and protection of DNA, proteins and lipids from oxidative damage (ID 209) pursuant to Article 13(1) of Regulation (EC) No 1924/2006, EFSA Journal, doi:10.2903/j.efsa.2009.1221.europa.eu, doi.org.

4. Franco et al., Retinoic Acid-Mediated Inhibition of Mouse Coronavirus Replication Is Dependent on IRF3 and CaMKK, Viruses, doi:10.3390/v16010140.mdpi.com, doi.org.

5. 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.

6. 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.

7. Huang et al., All-trans retinoic acid acts as a dual-purpose inhibitor of SARS-CoV-2 infection and inflammation, Computers in Biology and Medicine, doi:10.1016/j.compbiomed.2024.107942.sciencedirect.com, doi.org.

8. Li et al., Revealing the targets and mechanisms of vitamin A in the treatment of COVID-19, Aging, doi:10.18632/aging.103888.aging-us.com, doi.org.

9. 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.

10. Morita et al., All-Trans Retinoic Acid Exhibits Antiviral Effect against SARS-CoV-2 by Inhibiting 3CLpro Activity, Viruses, doi:10.3390/v13081669.mdpi.com, doi.org.

11. 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.

12. Tong et al., A Retinol Derivative Inhibits SARS-CoV-2 Infection by Interrupting Spike-Mediated Cellular Entry, mBio, doi:10.1128/mbio.01485-22.asm.org, doi.org.

Franco et al., 18 Jan 2024, USA, peer-reviewed, 7 authors. Contact: justin.franco@rockets.utoledo.edu (corresponding author), saurabh.chattopadhyay@uky.edu, kevin.pan@utoledo.edu.

This Paper Vitamin A All

Retinoic Acid-Mediated Inhibition of Mouse Coronavirus Replication Is Dependent on IRF3 and CaMKK

Justin H Franco, Ryan A Harris, William G Ryan, Roger Travis Taylor, Robert E Mccullumsmith, Saurabh Chattopadhyay, Zhixing K Pan

Viruses, doi:10.3390/v16010140

The ongoing COVID-19 pandemic has revealed the shortfalls in our understanding of how to treat coronavirus infections. With almost 7 million case fatalities of COVID-19 globally, the catalog of FDA-approved antiviral therapeutics is limited compared to other medications, such as antibiotics. All-trans retinoic acid (RA), or activated vitamin A, has been studied as a potential therapeutic against coronavirus infection because of its antiviral properties. Due to its impact on different signaling pathways, RA's mechanism of action during coronavirus infection has not been thoroughly described. To determine RA's mechanism of action, we examined its effect against a mouse coronavirus, mouse hepatitis virus strain A59 (MHV). We demonstrated that RA significantly decreased viral titers in infected mouse L929 fibroblasts and RAW 264.7 macrophages. The reduced viral titers were associated with a corresponding decrease in MHV nucleocapsid protein expression. Using interferon regulatory factor 3 (IRF3) knockout RAW 264.7 cells, we demonstrated that RA-induced suppression of MHV required IRF3 activity. RNA-seq analysis of wildtype and IRF3 knockout RAW cells showed that RA upregulated calcium/calmodulin (CaM) signaling proteins, such as CaM kinase kinase 1 (CaMKK1). When treated with a CaMKK inhibitor, RA was unable to upregulate IRF activation during MHV infection. In conclusion, our results demonstrate that RA-induced protection against coronavirus infection depends on IRF3 and CaMKK.

Supplementary Materials: The following supporting information can be downloaded at: https: //www.mdpi.com/article/10.3390/v16010140/s1, Figure S1 : 100 µM is non-toxic to mouse L929 cells, Figure S2 Conflicts of Interest: The authors declare no conflicts of interest.

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