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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 PLoS+Pathog
2017 ; 13
(2
): e1006155
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gab.com Text
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English Wikipedia
RNA-Seq analysis of chikungunya virus infection and identification of granzyme A
as a major promoter of arthritic inflammation
#MMPMID28207896
Wilson JA
; Prow NA
; Schroder WA
; Ellis JJ
; Cumming HE
; Gearing LJ
; Poo YS
; Taylor A
; Hertzog PJ
; Di Giallonardo F
; Hueston L
; Le Grand R
; Tang B
; Le TT
; Gardner J
; Mahalingam S
; Roques P
; Bird PI
; Suhrbier A
PLoS Pathog
2017[Feb]; 13
(2
): e1006155
PMID28207896
show ga
Chikungunya virus (CHIKV) is an arthritogenic alphavirus causing epidemics of
acute and chronic arthritic disease. Herein we describe a comprehensive RNA-Seq
analysis of feet and lymph nodes at peak viraemia (day 2 post infection), acute
arthritis (day 7) and chronic disease (day 30) in the CHIKV adult wild-type mouse
model. Genes previously shown to be up-regulated in CHIKV patients were also
up-regulated in the mouse model. CHIKV sequence information was also obtained
with up to ?8% of the reads mapping to the viral genome; however, no adaptive
viral genome changes were apparent. Although day 2, 7 and 30 represent distinct
stages of infection and disease, there was a pronounced overlap in up-regulated
host genes and pathways. Type I interferon response genes (IRGs) represented up
to ?50% of up-regulated genes, even after loss of type I interferon induction on
days 7 and 30. Bioinformatic analyses suggested a number of interferon response
factors were primarily responsible for maintaining type I IRG induction. A group
of genes prominent in the RNA-Seq analysis and hitherto unexplored in viral
arthropathies were granzymes A, B and K. Granzyme A-/- and to a lesser extent
granzyme K-/-, but not granzyme B-/-, mice showed a pronounced reduction in foot
swelling and arthritis, with analysis of granzyme A-/- mice showing no reductions
in viral loads but reduced NK and T cell infiltrates post CHIKV infection.
Treatment with Serpinb6b, a granzyme A inhibitor, also reduced arthritic
inflammation in wild-type mice. In non-human primates circulating granzyme A
levels were elevated after CHIKV infection, with the increase correlating with
viral load. Elevated granzyme A levels were also seen in a small cohort of human
CHIKV patients. Taken together these results suggest granzyme A is an important
driver of arthritic inflammation and a potential target for therapy. TRIAL
REGISTRATION: ClinicalTrials.gov NCT00281294.