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Niclosamide as a chemical probe for analyzing SARS-CoV-2 modulation of host cell lipid metabolism

Garrett et al., Frontiers in Microbiology, doi:10.3389/fmicb.2023.1251065
Oct 2023  
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In Vitro study showing that niclosamide modulates host lipid metabolism and reduces infectious SARS-CoV-2 virion production in Vero E6 cells. Authors observed reorganization of the lipid profile in infected cells, with increased triglycerides early and increased plasmalogens later during virus replication. Niclosamide treatment reduced plasmalogens, diacylglycerides, and ceramides that were elevated by infection, significantly reducing infectious virion production, though not affecting virus entry. At higher viral loads, niclosamide unexpectedly increased triglyceride levels and induced significant changes in phospholipid metabolism.
8 preclinical studies support the efficacy of niclosamide for COVID-19:
Garrett et al., 11 Oct 2023, peer-reviewed, 10 authors. Contact: tgarrett@ufl.edu, rdinglasan@epi.ufl.edu.
In Vitro studies are an important part of preclinical research, however results may be very different in vivo.
This PaperNiclosamideAll
Niclosamide as a chemical probe for analyzing SARS-CoV-2 modulation of host cell lipid metabolism
Timothy J Garrett, Heather Coatsworth, Iqbal Mahmud, Timothy Hamerly, Caroline J Stephenson, Jasmine B Ayers, Hoda S Yazd, Megan R Miller, John A Lednicky, Rhoel R Dinglasan
Frontiers in Microbiology, doi:10.3389/fmicb.2023.1251065
Introduction: SARS-CoV-2 subverts host cell processes to facilitate rapid replication and dissemination, and this leads to pathological inflammation. Methods: We used niclosamide (NIC), a poorly soluble anti-helminth drug identified initially for repurposed treatment of COVID-19, which activates the cells' autophagic and lipophagic processes as a chemical probe to determine if it can modulate the host cell's total lipid profile that would otherwise be either amplified or reduced during SARS-CoV-2 infection. Results: Through parallel lipidomic and transcriptomic analyses we observed massive reorganization of lipid profiles of SARS-CoV-2 infected Vero E6 cells, especially with triglycerides, which were elevated early during virus replication, but decreased thereafter, as well as plasmalogens, which were elevated at later timepoints during virus replication, but were also elevated under normal cell growth. These findings suggested a complex interplay of lipid profile reorganization involving plasmalogen metabolism. We also observed that NIC treatment of both low and high viral loads does not affect virus entry. Instead, NIC treatment reduced the abundance of plasmalogens, diacylglycerides, and ceramides, which we found elevated during virus infection in the absence of NIC, resulting in a significant reduction in the production of infectious virions. Unexpectedly, at higher viral loads, NIC treatment also resulted in elevated triglyceride levels, and induced significant changes in phospholipid metabolism. Discussion: We posit that future screens of approved or new partner drugs should prioritize compounds that effectively counter SARS-CoV-2 subversion of lipid metabolism, thereby reducing virus replication, egress, and the subsequent regulation of key lipid mediators of pathological inflammation.
Author contributions RD, TG, and JL conceptualized the study. IM, HC, TH, CS, MM, and JA conducted the study and generated samples and data. IM, HC, TH, MM, JA, HY, RD, and TG analyzed the data. IM, HC, TH, MM, JA, JL, RD, and TG wrote and edited the manuscript. All authors contributed to the article and approved the submitted version. Conflict of interest The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Publisher's note All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher. Supplementary material The Supplementary material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fmicb.2023.1251065/ full#supplementary-material
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{ 'indexed': { 'date-parts': [[2023, 10, 12]], 'date-time': '2023-10-12T05:23:59Z', 'timestamp': 1697088239345}, 'reference-count': 98, 'publisher': 'Frontiers Media SA', 'license': [ { 'start': { 'date-parts': [[2023, 10, 11]], 'date-time': '2023-10-11T00:00:00Z', 'timestamp': 1696982400000}, 'content-version': 'vor', 'delay-in-days': 0, 'URL': 'https://creativecommons.org/licenses/by/4.0/'}], 'content-domain': {'domain': ['frontiersin.org'], 'crossmark-restriction': True}, 'abstract': '<jats:sec><jats:title>Introduction</jats:title><jats:p>SARS-CoV-2 subverts host cell ' 'processes to facilitate rapid replication and dissemination, and this leads to pathological ' 'inflammation.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>We used ' 'niclosamide (NIC), a poorly soluble anti-helminth drug identified initially for repurposed ' 'treatment of COVID-19, which activates the cells’ autophagic and lipophagic processes as a ' 'chemical probe to determine if it can modulate the host cell’s total lipid profile that would ' 'otherwise be either amplified or reduced during SARS-CoV-2 ' 'infection.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>Through ' 'parallel lipidomic and transcriptomic analyses we observed massive reorganization of lipid ' 'profiles of SARS-CoV-2 infected Vero E6 cells, especially with triglycerides, which were ' 'elevated early during virus replication, but decreased thereafter, as well as plasmalogens, ' 'which were elevated at later timepoints during virus replication, but were also elevated ' 'under normal cell growth. These findings suggested a complex interplay of lipid profile ' 'reorganization involving plasmalogen metabolism. We also observed that NIC treatment of both ' 'low and high viral loads does not affect virus entry. Instead, NIC treatment reduced the ' 'abundance of plasmalogens, diacylglycerides, and ceramides, which we found elevated during ' 'virus infection in the absence of NIC, resulting in a significant reduction in the production ' 'of infectious virions. Unexpectedly, at higher viral loads, NIC treatment also resulted in ' 'elevated triglyceride levels, and induced significant changes in phospholipid ' 'metabolism.</jats:p></jats:sec><jats:sec><jats:title>Discussion</jats:title><jats:p>We posit ' 'that future screens of approved or new partner drugs should prioritize compounds that ' 'effectively counter SARS-CoV-2 subversion of lipid metabolism, thereby reducing virus ' 'replication, egress, and the subsequent regulation of key lipid mediators of pathological ' 'inflammation.</jats:p></jats:sec>', 'DOI': '10.3389/fmicb.2023.1251065', 'type': 'journal-article', 'created': { 'date-parts': [[2023, 10, 11]], 'date-time': '2023-10-11T07:28:44Z', 'timestamp': 1697009324000}, 'update-policy': 'http://dx.doi.org/10.3389/crossmark-policy', 'source': 'Crossref', 'is-referenced-by-count': 0, 'title': 'Niclosamide as a chemical probe for analyzing SARS-CoV-2 modulation of host cell lipid ' 'metabolism', 'prefix': '10.3389', 'volume': '14', 'author': [ {'given': 'Timothy J.', 'family': 'Garrett', 'sequence': 'first', 'affiliation': []}, {'given': 'Heather', 'family': 'Coatsworth', 'sequence': 'additional', 'affiliation': []}, {'given': 'Iqbal', 'family': 'Mahmud', 'sequence': 'additional', 'affiliation': []}, {'given': 'Timothy', 'family': 'Hamerly', 'sequence': 'additional', 'affiliation': []}, {'given': 'Caroline J.', 'family': 'Stephenson', 'sequence': 'additional', 'affiliation': []}, {'given': 'Jasmine B.', 'family': 'Ayers', 'sequence': 'additional', 'affiliation': []}, {'given': 'Hoda S.', 'family': 'Yazd', 'sequence': 'additional', 'affiliation': []}, {'given': 'Megan R.', 'family': 'Miller', 'sequence': 'additional', 'affiliation': []}, {'given': 'John A.', 'family': 'Lednicky', 'sequence': 'additional', 'affiliation': []}, {'given': 'Rhoel R.', 'family': 'Dinglasan', 'sequence': 'additional', 'affiliation': []}], 'member': '1965', 'published-online': {'date-parts': [[2023, 10, 11]]}, 'reference': [ { 'key': 'ref13', 'doi-asserted-by': 'publisher', 'first-page': 'e2830', 'DOI': '10.21769/BioProtoc.2830', 'article-title': 'Time-of-addition and Temperature-shift Assays to Determine Particular ' 'Step(s) in the Viral Life Cycle that is Blocked by Antiviral ' 'Substance(s)', 'volume': '8', 'author': 'Aoki-Utsubo', 'year': '2018', 'journal-title': 'Bio Protoc.'}, { 'key': 'ref1', 'doi-asserted-by': 'publisher', 'first-page': '339', 'DOI': '10.1007/s40519-017-0373-1', 'article-title': 'Niclosamide as an anti-obesity drug: an ex-perimental study', 'volume': '22', 'author': 'Al-Gareeb', 'year': '2017', 'journal-title': 'Eat. 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