Longitudinal Analysis of Inflammatory Response to SARS-CoV-2 in the Upper Respiratory Tract Reveals an Association with Viral Load, Independent of Symptoms.


Journal

Journal of clinical immunology
ISSN: 1573-2592
Titre abrégé: J Clin Immunol
Pays: Netherlands
ID NLM: 8102137

Informations de publication

Date de publication:
11 2021
Historique:
received: 03 02 2021
accepted: 05 09 2021
pubmed: 29 9 2021
medline: 1 12 2021
entrez: 28 9 2021
Statut: ppublish

Résumé

SARS-CoV-2 infection leads to high viral loads in the upper respiratory tract that may be determinant in virus dissemination. The extent of intranasal antiviral response in relation to symptoms is unknown. Understanding how local innate responses control virus is key in the development of therapeutic approaches. SARS-CoV-2-infected patients were enrolled in an observational study conducted at the Geneva University Hospitals, Switzerland, investigating virological and immunological characteristics. Nasal wash and serum specimens from a subset of patients were collected to measure viral load, IgA specific for the S1 domain of the spike protein, and a cytokine panel at different time points after infection; cytokine levels were analyzed in relation to symptoms. Samples from 13 SARS-CoV-2-infected patients and six controls were analyzed. We found an increase in CXCL10 and IL-6, whose levels remained elevated for up to 3 weeks after symptom onset. SARS-CoV-2 infection also induced CCL2 and GM-CSF, suggesting local recruitment and activation of myeloid cells. Local cytokine levels correlated with viral load but not with serum cytokine levels, nor with specific symptoms, including anosmia. Some patients had S1-specific IgA in the nasal cavity while almost none had IgG. The nasal epithelium is an active site of cytokine response against SARS-CoV-2 that can last more than 2 weeks; in this mild COVID-19 cohort, anosmia was not associated with increases in any locally produced cytokines.

Sections du résumé

BACKGROUND
SARS-CoV-2 infection leads to high viral loads in the upper respiratory tract that may be determinant in virus dissemination. The extent of intranasal antiviral response in relation to symptoms is unknown. Understanding how local innate responses control virus is key in the development of therapeutic approaches.
METHODS
SARS-CoV-2-infected patients were enrolled in an observational study conducted at the Geneva University Hospitals, Switzerland, investigating virological and immunological characteristics. Nasal wash and serum specimens from a subset of patients were collected to measure viral load, IgA specific for the S1 domain of the spike protein, and a cytokine panel at different time points after infection; cytokine levels were analyzed in relation to symptoms.
RESULTS
Samples from 13 SARS-CoV-2-infected patients and six controls were analyzed. We found an increase in CXCL10 and IL-6, whose levels remained elevated for up to 3 weeks after symptom onset. SARS-CoV-2 infection also induced CCL2 and GM-CSF, suggesting local recruitment and activation of myeloid cells. Local cytokine levels correlated with viral load but not with serum cytokine levels, nor with specific symptoms, including anosmia. Some patients had S1-specific IgA in the nasal cavity while almost none had IgG.
CONCLUSION
The nasal epithelium is an active site of cytokine response against SARS-CoV-2 that can last more than 2 weeks; in this mild COVID-19 cohort, anosmia was not associated with increases in any locally produced cytokines.

Identifiants

pubmed: 34581925
doi: 10.1007/s10875-021-01134-z
pii: 10.1007/s10875-021-01134-z
pmc: PMC8476983
doi:

Substances chimiques

Antibodies, Viral 0
Cytokines 0

Types de publication

Journal Article Observational Study Research Support, Non-U.S. Gov't

Langues

eng

Sous-ensembles de citation

IM

Pagination

1723-1732

Subventions

Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
ID : 31CA30_196732 / 1

Informations de copyright

© 2021. The Author(s).

Références

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Auteurs

Diem-Lan Vu (DL)

Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland. Diem-Lan.Vu@hcuge.ch.
Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland. Diem-Lan.Vu@hcuge.ch.
University of Geneva Medical School, Geneva, Switzerland. Diem-Lan.Vu@hcuge.ch.

Paola Martinez-Murillo (P)

Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland.

Fiona Pigny (F)

Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland.
University of Geneva Medical School, Geneva, Switzerland.

Maria Vono (M)

Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland.

Benjamin Meyer (B)

Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland.

Christiane S Eberhardt (CS)

University of Geneva Medical School, Geneva, Switzerland.
Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland.

Sylvain Lemeille (S)

Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland.

Elodie Von Dach (E)

Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland.
University of Geneva Medical School, Geneva, Switzerland.

Géraldine Blanchard-Rohner (G)

Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland.
Unit of Immunology and Vaccinology, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland.

Isabella Eckerle (I)

Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland.
Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland.
Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland.
Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland.

Angela Huttner (A)

Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland.
University of Geneva Medical School, Geneva, Switzerland.
Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland.

Claire-Anne Siegrist (CA)

University of Geneva Medical School, Geneva, Switzerland.
Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland.

Laurent Kaiser (L)

Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland.
Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland.
University of Geneva Medical School, Geneva, Switzerland.
Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland.

Arnaud M Didierlaurent (AM)

Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland. Arnaud.Didierlaurent@unige.ch.
Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland. Arnaud.Didierlaurent@unige.ch.

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