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2017 ; 127
(4
): 1271-1283
Nephropedia Template TP
gab.com Text
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CD11b activation suppresses TLR-dependent inflammation and autoimmunity in
systemic lupus erythematosus
#MMPMID28263189
Faridi MH
; Khan SQ
; Zhao W
; Lee HW
; Altintas MM
; Zhang K
; Kumar V
; Armstrong AR
; Carmona-Rivera C
; Dorschner JM
; Schnaith AM
; Li X
; Ghodke-Puranik Y
; Moore E
; Purmalek M
; Irizarry-Caro J
; Zhang T
; Day R
; Stoub D
; Hoffmann V
; Khaliqdina SJ
; Bhargava P
; Santander AM
; Torroella-Kouri M
; Issac B
; Cimbaluk DJ
; Zloza A
; Prabhakar R
; Deep S
; Jolly M
; Koh KH
; Reichner JS
; Bradshaw EM
; Chen J
; Moita LF
; Yuen PS
; Li Tsai W
; Singh B
; Reiser J
; Nath SK
; Niewold TB
; Vazquez-Padron RI
; Kaplan MJ
; Gupta V
J Clin Invest
2017[Apr]; 127
(4
): 1271-1283
PMID28263189
show ga
Genetic variations in the ITGAM gene (encoding CD11b) strongly associate with
risk for systemic lupus erythematosus (SLE). Here we have shown that 3
nonsynonymous ITGAM variants that produce defective CD11b associate with elevated
levels of type I interferon (IFN-I) in lupus, suggesting a direct link between
reduced CD11b activity and the chronically increased inflammatory status in
patients. Treatment with the small-molecule CD11b agonist LA1 led to partial
integrin activation, reduced IFN-I responses in WT but not CD11b-deficient mice,
and protected lupus-prone MRL/Lpr mice from end-organ injury. CD11b activation
reduced TLR-dependent proinflammatory signaling in leukocytes and suppressed
IFN-I signaling via an AKT/FOXO3/IFN regulatory factor 3/7 pathway.
TLR-stimulated macrophages from CD11B SNP carriers showed increased basal
expression of IFN regulatory factor 7 (IRF7) and IFN-?, as well as increased
nuclear exclusion of FOXO3, which was suppressed by LA1-dependent activation of
CD11b. This suggests that pharmacologic activation of CD11b could be a potential
mechanism for developing SLE therapeutics.
|Animals
[MESH]
|CD11b Antigen/genetics/*immunology
[MESH]
|Female
[MESH]
|Forkhead Box Protein O3/genetics/immunology
[MESH]