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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Allergy+Clin+Immunol
2016 ; 138
(3
): 814-824.e11
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Respiratory syncytial virus infection activates IL-13-producing group 2 innate
lymphoid cells through thymic stromal lymphopoietin
#MMPMID27156176
Stier MT
; Bloodworth MH
; Toki S
; Newcomb DC
; Goleniewska K
; Boyd KL
; Quitalig M
; Hotard AL
; Moore ML
; Hartert TV
; Zhou B
; McKenzie AN
; Peebles RS Jr
J Allergy Clin Immunol
2016[Sep]; 138
(3
): 814-824.e11
PMID27156176
show ga
BACKGROUND: Respiratory syncytial virus (RSV) is a major health care burden with
a particularly high worldwide morbidity and mortality rate among infants. Data
suggest that severe RSV-associated illness is in part caused by immunopathology
associated with a robust type 2 response. OBJECTIVE: We sought to determine the
capacity of RSV infection to stimulate group 2 innate lymphoid cells (ILC2s) and
the associated mechanism in a murine model. METHODS: Wild-type (WT) BALB/c,
thymic stromal lymphopoietin receptor (TSLPR) knockout (KO), or WT mice receiving
an anti-TSLP neutralizing antibody were infected with the RSV strain 01/2-20.
During the first 4 to 6 days of infection, lungs were collected for evaluation of
viral load, protein concentration, airway mucus, airway reactivity, or ILC2
numbers. Results were confirmed with 2 additional RSV clinical isolates, 12/11-19
and 12/12-6, with known human pathogenic potential. RESULTS: RSV induced a 3-fold
increase in the number of IL-13-producing ILC2s at day 4 after infection, with a
concurrent increase in total lung IL-13 levels. Both thymic stromal lymphopoietin
(TSLP) and IL-33 levels were increased 12 hours after infection. TSLPR KO mice
did not mount an IL-13-producing ILC2 response to RSV infection. Additionally,
neutralization of TSLP significantly attenuated the RSV-induced IL-13-producing
ILC2 response. TSLPR KO mice displayed reduced lung IL-13 protein levels,
decreased airway mucus and reactivity, attenuated weight loss, and similar viral
loads as WT mice. Both 12/11-19 and 12/12-6 similarly induced IL-13-producing
ILC2s through a TSLP-dependent mechanism. CONCLUSION: These data demonstrate that
multiple pathogenic strains of RSV induce IL-13-producing ILC2 proliferation and
activation through a TSLP-dependent mechanism in a murine model and suggest the
potential therapeutic targeting of TSLP during severe RSV infection.