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2014 ; 15
(5
): 320-32
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
An ENU-induced splicing mutation reveals a role for Unc93b1 in early immune cell
activation following influenza A H1N1 infection
#MMPMID24848930
Lafferty EI
; Flaczyk A
; Angers I
; Homer R
; d'Hennezel E
; Malo D
; Piccirillo CA
; Vidal SM
; Qureshi ST
Genes Immun
2014[Jul]; 15
(5
): 320-32
PMID24848930
show ga
Genetic and immunological analysis of host-pathogen interactions can reveal
fundamental mechanisms of susceptibility and resistance to infection. Modeling
human infectious diseases among inbred mouse strains is a proven approach but is
limited by naturally occurring genetic diversity. Using N-ethyl-N-nitrosourea
mutagenesis, we created a recessive loss-of-function point mutation in Unc93b1
(unc-93 homolog B1 (C. elegans)), a chaperone for endosomal Toll-like receptors
(TLR)3, TLR7 and TLR9, which we termed Letr for 'loss of endosomal TLR response'.
We used Unc93b1(Letr/Letr) mice to study the role of Unc93b1 in the immune
response to influenza A/PR/8/34 (H1N1), an important global respiratory pathogen.
During the early phase of infection, Unc93b1(Letr/Letr) mice had fewer activated
exudate macrophages and decreased expression of CXCL10, interferon (IFN)-? and
type I IFN. Mutation of Unc93b1 also led to reduced expression of the CD69
activation marker and a concomitant increase in the CD62L naive marker on CD4(+)
and CD8(+) T cells in infected lungs. Finally, loss of endosomal TLR signaling
resulted in delayed viral clearance that coincided with increased tissue
pathology during infection. Taken together, these findings establish a role for
Unc93b1 and endosomal TLRs in the activation of both myeloid and lymphoid cells
during the innate immune response to influenza.
|*Lymphocyte Activation
[MESH]
|*Macrophage Activation
[MESH]
|*Mutation
[MESH]
|Alternative Splicing
[MESH]
|Animals
[MESH]
|CD8-Positive T-Lymphocytes/metabolism
[MESH]
|Chemokine CXCL10/genetics/metabolism
[MESH]
|Endosomes/metabolism
[MESH]
|Ethylnitrosourea
[MESH]
|Immunity, Innate
[MESH]
|Influenza A Virus, H1N1 Subtype/pathogenicity
[MESH]
|Interferon Type I/genetics/metabolism
[MESH]
|Interferon-gamma/genetics/metabolism
[MESH]
|L-Selectin/genetics/metabolism
[MESH]
|Lung/metabolism/pathology
[MESH]
|Membrane Transport Proteins/*genetics/metabolism
[MESH]