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Potential In Vitro Inhibition of Selected Plant Extracts against SARS-CoV-2 Chymotripsin-Like Protease (3CLPro) Activity

Guijarro-Real et al., Foods, doi:10.3390/foods10071503
Jun 2021  
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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 112 treatments. c19early.org
In Vitro study of several plant extracts, showing strong inhibition of SARS-CoV-2 3CLpro activity by turmeric rhizomes. Commercial curcumin also inhibited 3CLpro activity, but did not fully account for the inhibitory effect of turmeric rhizomes extracts, suggesting that other components of the turmeric extract also play a main role in inhibiting 3CLpro activity.
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.
a. The trimeric spike (S) protein is a glycoprotein that mediates viral entry by binding to the host ACE2 receptor, is critical for SARS-CoV-2's ability to infect host cells, and is a target of neutralizing antibodies. Inhibition of the spike protein prevents viral attachment, halting infection at the earliest stage.
b. The receptor binding domain is a specific region of the spike protein that binds ACE2 and is a major target of neutralizing antibodies. Focusing on the precise binding site allows highly specific disruption of viral attachment with reduced potential for off-target effects.
c. The main protease or Mpro, also known as 3CLpro or nsp5, is a cysteine protease that cleaves viral polyproteins into functional units needed for replication. Inhibiting Mpro disrupts the SARS-CoV-2 lifecycle within the host cell, preventing the creation of new copies.
d. RNA-dependent RNA polymerase (RdRp), also called nsp12, is the core enzyme of the viral replicase-transcriptase complex that copies the positive-sense viral RNA genome into negative-sense templates for progeny RNA synthesis. Inhibiting RdRp blocks viral genome replication and transcription.
e. The papain-like protease (PLpro) has multiple functions including cleaving viral polyproteins and suppressing the host immune response by deubiquitination and deISGylation of host proteins. Inhibiting PLpro may block viral replication and help restore normal immune responses.
f. The angiotensin converting enzyme 2 (ACE2) protein is a host cell transmembrane protein that serves as the cellular receptor for the SARS-CoV-2 spike protein. ACE2 is expressed on many cell types, including epithelial cells in the lungs, and allows the virus to enter and infect host cells. Inhibition may affect ACE2's physiological function in blood pressure control.
g. The nucleocapsid (N) protein binds and encapsulates the viral genome by coating the viral RNA. N enables formation and release of infectious virions and plays additional roles in viral replication and pathogenesis. N is also an immunodominant antigen used in diagnostic assays.
h. Non-structural protein 10 (nsp10) serves as an RNA chaperone and stabilizes conformations of nsp12 and nsp14 in the replicase-transcriptase complex, which synthesizes new viral RNAs. Nsp10 disruption may destabilize replicase-transcriptase complex activity.
i. The helicase, or nsp13, protein unwinds the double-stranded viral RNA, a crucial step in replication and transcription. Inhibition may prevent viral genome replication and the creation of new virus components.
j. Transmembrane protease serine 2 (TMPRSS2) is a host cell protease that primes the spike protein, facilitating cellular entry. TMPRSS2 activity helps enable cleavage of the spike protein required for membrane fusion and virus entry. Inhibition may especially protect respiratory epithelial cells, buy may have physiological effects.
k. The interaction between the SARS-CoV-2 spike protein and the human ACE2 receptor is a primary method of viral entry, inhibiting this interaction can prevent the virus from attaching to and entering host cells, halting infection at an early stage.
l. Calu-3 is a human lung adenocarcinoma cell line with moderate ACE2 and TMPRSS2 expression and SARS-CoV-2 susceptibility. It provides a model of the human respiratory epithelium, but many not be ideal for modeling early stages of infection due to the moderate expression levels of ACE2 and TMPRSS2.
m. A549 is a human lung carcinoma cell line with low ACE2 expression and SARS-CoV-2 susceptibility. Viral entry/replication can be studied but the cells may not replicate all aspects of lung infection.
n. 293T is a human embryonic kidney cell line that can be engineered for high ACE2 expression and SARS-CoV-2 susceptibility. 293T cells are easily transfected and support high protein expression.
o. HEK293-hACE2 is a human embryonic kidney cell line with high ACE2 expression and SARS-CoV-2 susceptibility. Cells have been transfected with a plasmid to express the human ACE2 (hACE2) protein.
p. 293T/hACE2/TMPRSS2 is a human embryonic kidney cell line engineered for high ACE2 and TMPRSS2 expression, which mimics key aspects of human infection. 293T/hACE2/TMPRSS2 cells are very susceptible to SARS-CoV-2 infection.
q. Vero E6 is an African green monkey kidney cell line with low/no ACE2 expression and high SARS-CoV-2 susceptibility. The cell line is easy to maintain and supports robust viral replication, however the monkey origin may not accurately represent human responses.
r. SH-SY5Y is a human neuroblastoma cell line that exhibits neuronal phenotypes. It is commonly used as an in vitro model for studying neurotoxicity, neurodegenerative diseases, and neuronal differentiation.
Guijarro-Real et al., 29 Jun 2021, peer-reviewed, 5 authors.
In Vitro studies are an important part of preclinical research, however results may be very different in vivo.
This PaperCurcuminAll
Potential In Vitro Inhibition of Selected Plant Extracts against SARS-CoV-2 Chymotripsin-Like Protease (3CLPro) Activity
Carla Guijarro-Real, Mariola Plazas, Adrián Rodríguez-Burruezo, Jaime Prohens, Ana Fita
Foods, doi:10.3390/foods10071503
Antiviral treatments inhibiting Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) replication may represent a strategy complementary to vaccination to fight the ongoing Coronavirus disease 19 (COVID-19) pandemic. Molecules or extracts inhibiting the SARS-CoV-2 chymotripsin-like protease (3CL Pro ) could contribute to reducing or suppressing SARS-CoV-2 replication. Using a targeted approach, we identified 17 plant products that are included in current and traditional cuisines as promising inhibitors of SARS-CoV-2 3CL Pro activity. Methanolic extracts were evaluated in vitro for inhibition of SARS-CoV-2 3CL Pro activity using a quenched fluorescence resonance energy transfer (FRET) assay. Extracts from turmeric (Curcuma longa) rhizomes, mustard (Brassica nigra) seeds, and wall rocket (Diplotaxis erucoides subsp. erucoides) at 500 µg mL −1 displayed significant inhibition of the 3CL Pro activity, resulting in residual protease activities of 0.0%, 9.4%, and 14.9%, respectively. Using different extract concentrations, an IC 50 value of 15.74 µg mL −1 was calculated for turmeric extract. Commercial curcumin inhibited the 3CL Pro activity, but did not fully account for the inhibitory effect of turmeric rhizomes extracts, suggesting that other components of the turmeric extract must also play a main role in inhibiting the 3CL Pro activity. Sinigrin, a major glucosinolate present in mustard seeds and wall rocket, did not have relevant 3CL Pro inhibitory activity; however, its hydrolysis product allyl isothiocyanate had an IC 50 value of 41.43 µg mL −1 . The current study identifies plant extracts and molecules that can be of interest in the search for treatments against COVID-19, acting as a basis for future chemical, in vivo, and clinical trials.
This work is a first targeted approach for the evaluation of plant extracts and containing natural compounds for the development of prophylaxis, adjuvant therapies, and drug treatments aimed at inhibiting the activity of SARS-CoV-2 3CL Pro . Extracts of turmeric have been identified as a candidate plant extract for reducing SARS-CoV-2 3CL Pro activity, which could eventually affect the viral replication. In addition, other plant extracts, such as those of cruciferous plants containing sinigrin, which, after consumption, is degraded to allyl isothiocyanate, might be considered as well for their inhibition of SARS-CoV-2 3CL Pro activity. The current study provides information that can help in the search for treatments against COVID-19, acting as a basis for future chemical, in vivo, and clinical trials. Thus, further studies following the results of this work should be addressed: (1) to chemically characterize the plant extracts with high potential inhibitory activity and to re-evaluate this capacity after the fractionation of the extracts, thus allowing the identification of the biomolecules responsible of such activity and possible synergistic effects; and (2) to evaluate this potential inhibition in cell-based studies where the virus, host cell, and plant extract interact, also determining the toxicity limit prior to conducting other pre-clinical and clinical trials. Supplementary Materials: The following are available online at https://www.mdpi.com/article/..
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{ 'indexed': {'date-parts': [[2024, 5, 7]], 'date-time': '2024-05-07T11:18:14Z', 'timestamp': 1715080694558}, 'reference-count': 87, 'publisher': 'MDPI AG', 'issue': '7', 'license': [ { 'start': { 'date-parts': [[2021, 6, 29]], 'date-time': '2021-06-29T00:00:00Z', 'timestamp': 1624924800000}, 'content-version': 'vor', 'delay-in-days': 0, 'URL': 'https://creativecommons.org/licenses/by/4.0/'}], 'content-domain': {'domain': [], 'crossmark-restriction': False}, 'abstract': '<jats:p>Antiviral treatments inhibiting Severe acute respiratory syndrome coronavirus 2 ' '(SARS-CoV-2) replication may represent a strategy complementary to vaccination to fight the ' 'ongoing Coronavirus disease 19 (COVID-19) pandemic. Molecules or extracts inhibiting the ' 'SARS-CoV-2 chymotripsin-like protease (3CLPro) could contribute to reducing or suppressing ' 'SARS-CoV-2 replication. Using a targeted approach, we identified 17 plant products that are ' 'included in current and traditional cuisines as promising inhibitors of SARS-CoV-2 3CLPro ' 'activity. Methanolic extracts were evaluated in vitro for inhibition of SARS-CoV-2 3CLPro ' 'activity using a quenched fluorescence resonance energy transfer (FRET) assay. Extracts from ' 'turmeric (Curcuma longa) rhizomes, mustard (Brassica nigra) seeds, and wall rocket ' '(Diplotaxis erucoides subsp. erucoides) at 500 µg mL−1 displayed significant inhibition of ' 'the 3CLPro activity, resulting in residual protease activities of 0.0%, 9.4%, and 14.9%, ' 'respectively. Using different extract concentrations, an IC50 value of 15.74 µg mL−1 was ' 'calculated for turmeric extract. Commercial curcumin inhibited the 3CLPro activity, but did ' 'not fully account for the inhibitory effect of turmeric rhizomes extracts, suggesting that ' 'other components of the turmeric extract must also play a main role in inhibiting the 3CLPro ' 'activity. Sinigrin, a major glucosinolate present in mustard seeds and wall rocket, did not ' 'have relevant 3CLPro inhibitory activity; however, its hydrolysis product allyl ' 'isothiocyanate had an IC50 value of 41.43 µg mL−1. The current study identifies plant ' 'extracts and molecules that can be of interest in the search for treatments against COVID-19, ' 'acting as a basis for future chemical, in vivo, and clinical trials.</jats:p>', 'DOI': '10.3390/foods10071503', 'type': 'journal-article', 'created': {'date-parts': [[2021, 6, 29]], 'date-time': '2021-06-29T14:52:46Z', 'timestamp': 1624978366000}, 'page': '1503', 'source': 'Crossref', 'is-referenced-by-count': 28, 'title': 'Potential In Vitro Inhibition of Selected Plant Extracts against SARS-CoV-2 Chymotripsin-Like ' 'Protease (3CLPro) Activity', 'prefix': '10.3390', 'volume': '10', 'author': [ { 'ORCID': 'http://orcid.org/0000-0002-8015-1559', 'authenticated-orcid': False, 'given': 'Carla', 'family': 'Guijarro-Real', 'sequence': 'first', 'affiliation': []}, { 'ORCID': 'http://orcid.org/0000-0001-8090-7312', 'authenticated-orcid': False, 'given': 'Mariola', 'family': 'Plazas', 'sequence': 'additional', 'affiliation': []}, { 'given': 'Adrián', 'family': 'Rodríguez-Burruezo', 'sequence': 'additional', 'affiliation': []}, { 'ORCID': 'http://orcid.org/0000-0003-1181-9065', 'authenticated-orcid': False, 'given': 'Jaime', 'family': 'Prohens', 'sequence': 'additional', 'affiliation': []}, { 'ORCID': 'http://orcid.org/0000-0002-8637-5852', 'authenticated-orcid': False, 'given': 'Ana', 'family': 'Fita', 'sequence': 'additional', 'affiliation': []}], 'member': '1968', 'published-online': {'date-parts': [[2021, 6, 29]]}, 'reference': [ {'key': 'ref1', 'doi-asserted-by': 'publisher', 'DOI': '10.1021/acs.molpharmaceut.0c00608'}, { 'key': 'ref2', 'unstructured': 'Coronavirus Disease (COVID-19) Weekly Epidemiological Update and Weekly ' 'Operational Update. 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