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2015 ; 212
(11
): 1851-68
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Critical role of phospholipase A2 group IID in age-related susceptibility to
severe acute respiratory syndrome-CoV infection
#MMPMID26392224
Vijay R
; Hua X
; Meyerholz DK
; Miki Y
; Yamamoto K
; Gelb M
; Murakami M
; Perlman S
J Exp Med
2015[Oct]; 212
(11
): 1851-68
PMID26392224
show ga
Oxidative stress and chronic low-grade inflammation in the lungs are associated
with aging and may contribute to age-related immune dysfunction. To maintain lung
homeostasis, chronic inflammation is countered by enhanced expression of
proresolving/antiinflammatory factors. Here, we show that age-dependent increases
of one such factor in the lungs, a phospholipase A2 (PLA2) group IID (PLA2G2D)
with antiinflammatory properties, contributed to worse outcomes in mice infected
with severe acute respiratory syndrome-coronavirus (SARS-CoV). Strikingly,
infection of mice lacking PLA2G2D expression (Pla2g2d(-/-) mice) converted a
uniformly lethal infection to a nonlethal one (>80% survival), subsequent to
development of enhanced respiratory DC migration to the draining lymph nodes,
augmented antivirus T cell responses, and diminished lung damage. We also
observed similar effects in influenza A virus-infected middle-aged Pla2g2d(-/-)
mice. Furthermore, oxidative stress, probably via lipid peroxidation, was found
to induce PLA2G2D expression in mice and in human monocyte-derived macrophages.
Thus, our results suggest that directed inhibition of a single inducible
phospholipase, PLA2G2D, in the lungs of older patients with severe respiratory
infections is potentially an attractive therapeutic intervention to restore
immune function.