SARS-CoV-2 infection induces functional impairment of vitamin D receptor signaling to drive interleukin 6-dependent hyperinflammation in mononuclear phagocytes

Valdés-López et al., PLOS One, doi:10.1371/journal.pone.0357030, Sep 2026

Vitamin D for COVID-19

8th treatment shown to reduce risk in October 2020, now with p < 0.0000000001 from 138 studies, recognized in 18 countries.

No treatment is 100% effective.
Protocols combine treatments.

In silico and in vitro study showing benefit with calcitriol (active vitamin D) against SARS-CoV-2-related IL-6 hyperinflammation in mononuclear phagocytes.
29 preclinical studies support the efficacy of vitamin D for COVID-19:
Vitamin D has been identified by the European Food Safety Authority (EFSA) as having sufficient evidence for a causal relationship between intake and optimal immune system function27-30. Vitamin D inhibits SARS-CoV-2 replication in vitro17,24, mitigates lung inflammation, damage, and lethality in mice with an MHV-3 model for β-CoV respiratory infections17,24, reduces SARS-CoV-2 replication in nasal epithelial cells via increased type I interferon expression20, downregulates proinflammatory cytokines IL-1β and TNF-α in SARS-CoV-2 spike protein-stimulated cells16, attenuates nucleocapsid protein-induced hyperinflammation by inactivating the NLRP3 inflammasome through the VDR-BRCC3 signaling pathway21, may be neuroprotective by protecting the blood-brain barrier, reducing neuroinflammation, and via immunomodulatory effects31, may mitigate hyperinflammation and cytokine storm by upregulating TLR10 expression which downregulates proinflammatory cytokines13, downregulates ACE2 and TMPRSS2 in human trophoblasts and minimizes spike protein-induced inflammation19, may minimize cytokine storm by dampening excessive cytokine production2, may suppress viral entry and replication via LL-37 induction11,12, and minimizes platelet aggregation mediated by SARS-CoV-2 spike protein via inhibiting integrin αIIbβ3 outside-in signaling15. Cholecalciferol and calcifediol directly bind two allosteric pockets on the SARS-CoV-2 Spike RBD, bias the trimer toward a closed state, weaken ACE2 engagement, and reduce viral entry in cell models1. Calcitriol may destabilize the Spike protein architecture and inhibit IL-17R dimerization, blocking viral entry and mitigating hyperinflammatory cytokine storm32. Vitamin D improves regulatory immune cell levels and control of proinflammatory cytokines in severe COVID-1933. Calcifediol inhibits SARS-CoV-2 papain-like protease (PLpro), a critical enzyme for viral replication14. Symptomatic COVID-19 is associated with a lower frequency of natural killer (NK) cells and vitamin D has been shown to improve NK cell activity34,35.
Valdés-López et al., 11 Sep 2026, USA, peer-reviewed, 9 authors. Contact: maria.navas@udea.edu.co.
In vitro studies are an important part of preclinical research, however results may be very different in vivo.
Abstract: Citation: Valdés-López JF, di Filippo D, Penagos S, Hernández-Sarmiento LJ, Arroyave-Ospina JC, Rojas M, et al. (2026) SARS-CoV-2 infection induces functional impairment of vitamin D receptor signaling to drive interleukin 6-dependent hyperinflammation in mononuclear phagocytes. PLoS One 21(9): e0357030. https://doi.org/10.1371/journal. pone.0357030 Editor: Muhammad Iqhrammullah, Universitas Muhammadiyah Aceh, INDONESIA Received: April 15, 2026 Accepted: August 11, 2026 Published: September 11, 2026 Peer Review History: PLOS recognizes the benefits of transparency in the peer review process; therefore, we enable the publication of all of the content of peer review and author responses alongside final, published articles. The editorial history of this article is available here: https://doi.org/10.1371/journal. pone.0357030 Copyright: © 2026 Valdés-López et al. This is an open access article distributed under the RESEARCH ARTICLE SARS-CoV-2 infection induces functional impairment of vitamin D receptor signaling to drive interleukin 6-dependent hyperinflammation in mononuclear phagocytes Juan Felipe Valdés-López 1,2 , Diana di Filippo 1 , Sharon Penagos 1 , Lady Johana Hernández-Sarmiento 2 , Johanna C. Arroyave-Ospina 1 , Mauricio Rojas 3 , Silvio Urcuqui-Inchima 2 , Wbeimar Aguilar-Jiménez 2 , Maria-Cristina Navas 1 * - 1 Grupo Gastrohepatología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia, - 2 Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia, 3 Grupo de Inmunología Celular e Inmunogenética (GICIG), Facultad de Medicina y Unidad de Citometría, Sede de Investigación Universitaria, Universidad de Antioquia , Medellín, Colombia [* maria.navas@udea.edu.co](mailto:maria.navas@udea.edu.co) Abstract The dysregulated inflammatory response, particularly the interleukin 6 (IL-6)-driven cytokine storm, is a hallmark of severe COVID-19. Mononuclear phagocytes are key cellular populations in the pathogenesis of SARS-CoV-2 infection, but the underlying regulatory mechanisms remain incompletely defined. Based on existing evidence of vitamin D immunomodulatory properties in viral infections, we investigated its role during SARS-CoV-2 infection. We integrated transcriptional profiling of monocytes and myeloid dendritic cells (mDCs) from healthy individuals and COVID-19 patients (moderate/severe, with/without viremia) with an in vitro model of SARS-CoV-2-infected monocyte-derived macrophages (MDMs). Additionally, a functional assay using U937-derived monocytes and macrophages challenged with inactivated SARS-CoV-2 particles was used to assess the immunomodulatory effect of calcitriol (vitamin D) treatment. We found that SARS-CoV-2 infection triggers an NFκ B-dependent inflammatory signature associated with disease severity, both in monocytes from COVID-19 patients and in MDMs infected in vitro . This signature is characterized by hyperproduction of IL-6 and upregulation of its signaling components, including IL6R, JAK1/2, STAT3, and SOCS3. Moreover, we found some evidence of a novel viral-dependent suppression of the Vitamin D Receptor (VDR) pathway, demonstrated by downregulation of both VDR expression and its target genes, including CAMP, LYZ, and IRF5, in monocytes from patients with COVID-19 and in vitro SARS-CoV-2-infected MDMs. This resulted in functional impairment of VDR signaling. Importantly, calcitriol treatment potently suppressed SARS-CoV-2induced IL-6..
DOI record: { "DOI": "10.1371/journal.pone.0357030", "ISSN": [ "1932-6203" ], "URL": "http://dx.doi.org/10.1371/journal.pone.0357030", "abstract": "<jats:p>\n The dysregulated inflammatory response, particularly the interleukin 6 (IL-6)-driven cytokine storm, is a hallmark of severe COVID-19. Mononuclear phagocytes are key cellular populations in the pathogenesis of SARS-CoV-2 infection, but the underlying regulatory mechanisms remain incompletely defined. Based on existing evidence of vitamin D immunomodulatory properties in viral infections, we investigated its role during SARS-CoV-2 infection. We integrated transcriptional profiling of monocytes and myeloid dendritic cells (mDCs) from healthy individuals and COVID-19 patients (moderate/severe, with/without viremia) with an\n <jats:italic>in vitro</jats:italic>\n model of SARS-CoV-2-infected monocyte-derived macrophages (MDMs). Additionally, a functional assay using U937-derived monocytes and macrophages challenged with inactivated SARS-CoV-2 particles was used to assess the immunomodulatory effect of calcitriol (vitamin D) treatment. We found that SARS-CoV-2 infection triggers an NF-κB-dependent inflammatory signature associated with disease severity, both in monocytes from COVID-19 patients and in MDMs infected\n <jats:italic>in vitro</jats:italic>\n . This signature is characterized by hyperproduction of IL-6 and upregulation of its signaling components, including IL6R, JAK1/2, STAT3, and SOCS3. Moreover, we found some evidence of a novel viral-dependent suppression of the Vitamin D Receptor (VDR) pathway, demonstrated by downregulation of both VDR expression and its target genes, including CAMP, LYZ, and IRF5, in monocytes from patients with COVID-19 and\n <jats:italic>in vitro</jats:italic>\n SARS-CoV-2-infected MDMs. This resulted in functional impairment of VDR signaling. Importantly, calcitriol treatment potently suppressed SARS-CoV-2-induced IL-6 production in our model of U937 cell line, suggesting that restoration of VDR signaling could temper this key inflammatory axis. Our findings reveal a dual-hit mechanism in severe COVID-19, in which SARS-CoV-2 infection simultaneously hyperactivates the pro-inflammatory pattern-recognition receptors/NF-κB/IL-6 axis and suppresses the anti-inflammatory VDR pathway in mononuclear phagocytes. The effective inhibition of IL-6 by calcitriol provides a potential role of vitamin D in mitigating pathological inflammation, positioning it as a plausible immunomodulatory strategy for severe COVID-19.\n </jats:p>", "author": [ { "ORCID": "https://orcid.org/0000-0003-3691-4501", "affiliation": [ { "department": [ "Grupo Gastrohepatología, Facultad de Medicina" ], "name": "Universidad de Antioquia", "place": [ "Medellín, Colombia" ] }, { "department": [ "Grupo Inmunovirología, Facultad de Medicina" ], "name": "Universidad de Antioquia", "place": [ "Medellín, Colombia" ] } ], "authenticated-orcid": true, "family": "Valdés-López", "given": "Juan Felipe", "role": [ { "role": "author", "vocabulary": "crossref" } ], "sequence": "first" }, { "affiliation": [ { "department": [ "Grupo Gastrohepatología, Facultad de Medicina" ], "name": "Universidad de Antioquia", "place": [ "Medellín, Colombia" ] } ], "family": "di Filippo", "given": "Diana", "role": [ { "role": "author", "vocabulary": "crossref" } ], "sequence": "additional" }, { "affiliation": [ { "department": [ "Grupo Gastrohepatología, Facultad de Medicina" ], "name": "Universidad de Antioquia", "place": [ "Medellín, Colombia" ] } ], "family": "Penagos", "given": "Sharon", "role": [ { "role": "author", "vocabulary": "crossref" } ], "sequence": "additional" }, { "ORCID": "https://orcid.org/0000-0002-3733-3488", "affiliation": [ { "department": [ "Grupo Inmunovirología, Facultad de Medicina" ], "name": "Universidad de Antioquia", "place": [ "Medellín, Colombia" ] } ], "authenticated-orcid": true, "family": "Hernández-Sarmiento", "given": "Lady Johana", "role": [ { "role": "author", "vocabulary": "crossref" } ], "sequence": "additional" }, { "affiliation": [ { "department": [ "Grupo Gastrohepatología, Facultad de Medicina" ], "name": "Universidad de Antioquia", "place": [ "Medellín, Colombia" ] } ], "family": "Arroyave-Ospina", "given": "Johanna C.", "role": [ { "role": "author", "vocabulary": "crossref" } ], 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