Characterizing T cell subsets in the nasal mucosa of children with acute respiratory symptoms.

Abstract:

BACKGROUND:In infants admitted to an ICU with respiratory failure, there is an association between the ratio of CD8+ to CD4+ T cells within the upper respiratory tract and disease severity. Whether this ratio is associated with respiratory disease severity within children presenting to a pediatric emergency department is not known. METHODS:We studied a convenience sample of 63 children presenting to a pediatric emergency department with respiratory symptoms. T cell subsets in the nasal mucosa were analyzed by flow cytometry. We compared CD4+ and CD8+ T cells subsets in these samples and analyzed the proportion of these subsets that expressed markers associated with tissue residency. RESULTS:We were able to identify major subsets of CD8 and CD4 T cells within the nasal mucosa using flocked swabs. We found no difference in the ratio CD8+ to CD4+ T cells in children with upper or lower respiratory illness. A positive association between tissue-resident memory T cell frequency and patient age was identified. CONCLUSIONS:In our patient populations, the CD8+:CD4+ ratio was not associated with disease severity. The majority of T cells collected on nasal swabs are antigen experienced, and there is an association between the frequency of tissue-resident T cells and age. IMPACT:Immune cell populations from the nasal mucosa can be captured using flocked nasal swabs and analyzed by flow cytometry. Nasal CD8+:CD4+ ratio does not predict respiratory illness severity in children presenting to the emergency department. The frequency of CD8+ and CD4+ resident memory T cells within the nasal mucosa increases with age.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Cosgrove PR,Redhu NS,Tang Y,Monuteaux MC,Horwitz BH

doi

10.1038/s41390-021-01364-2

subject

Has Abstract

pub_date

2021-01-27 00:00:00

eissn

0031-3998

issn

1530-0447

pii

10.1038/s41390-021-01364-2

pub_type

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