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2017 ; 9
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gab.com Text
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English Wikipedia
Influenza A Virus Infection Damages Zebrafish Skeletal Muscle and Exacerbates
Disease in Zebrafish Modeling Duchenne Muscular Dystrophy
#MMPMID29188128
Goody M
; Jurczyszak D
; Kim C
; Henry C
PLoS Curr
2017[Oct]; 9
(ä): ä PMID29188128
show ga
INTRODUCTION: Both genetic and infectious diseases can result in skeletal muscle
degeneration, inflammation, pain, and/or weakness. Duchenne muscular dystrophy
(DMD) is the most common congenital muscle disease. DMD causes progressive muscle
wasting due to mutations in Dystrophin. Influenza A and B viruses are frequently
associated with muscle complications, especially in children. Infections activate
an immune response and immunosuppressant drugs reduce DMD symptoms. These data
suggest that the immune system may contribute to muscle pathology. However, roles
of the immune response in DMD and Influenza muscle complications are not well
understood. Zebrafish with dmd mutations are a well-characterized model in which
to study the molecular and cellular mechanisms of DMD pathology. We recently
showed that zebrafish can be infected by human Influenza A virus (IAV). Thus, the
zebrafish is a powerful system with which to ask questions about the etiology and
mechanisms of muscle damage due to genetic and/or infectious diseases. METHODS:
We infected zebrafish with IAV and assayed muscle tissue structure, sarcolemma
integrity, cell-extracellular matrix (ECM) attachment, and molecular and cellular
markers of inflammation in response to IAV infection alone or in the context of
DMD. RESULTS: We find that IAV-infected zebrafish display mild muscle
degeneration with sarcolemma damage and compromised ECM adhesion. An innate
immune response is elicited in muscle in IAV-infected zebrafish: NFkB signaling
is activated, pro-inflammatory cytokine expression is upregulated, and
neutrophils localize to sites of muscle damage. IAV-infected dmd mutants display
more severe muscle damage than would be expected from an additive effect of
dmd mutation and IAV infection, suggesting that muscle damage caused by
Dystrophin-deficiency and IAV infection is synergistic. DISCUSSION: These data
demonstrate the importance of preventing IAV infections in individuals with
genetic muscle diseases. Elucidating the mechanisms of immune-mediated muscle
damage will not only apply to DMD and IAV, but also to other conditions where the
immune system, inflammation, and muscle tissue are known to be affected, such as
autoimmune diseases, cancer, and aging.