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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 Biochim+Biophys+Acta
2015 ; 1852
(11
): 2362-71
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Blockade of exosome generation with GW4869 dampens the sepsis-induced
inflammation and cardiac dysfunction
#MMPMID26300484
Essandoh K
; Yang L
; Wang X
; Huang W
; Qin D
; Hao J
; Wang Y
; Zingarelli B
; Peng T
; Fan GC
Biochim Biophys Acta
2015[Nov]; 1852
(11
): 2362-71
PMID26300484
show ga
Sepsis is an infection-induced severe inflammatory disorder that leads to
multiple organ failure. Amongst organs affected, myocardial depression is
believed to be a major contributor to septic death. While it has been identified
that large amounts of circulating pro-inflammatory cytokines are culprit for
triggering cardiac dysfunction in sepsis, the underlying mechanisms remain
obscure. Additionally, recent studies have shown that exosomes released from
bacteria-infected macrophages are pro-inflammatory. Hence, we examined in this
study whether blocking the generation of exosomes would be protective against
sepsis-induced inflammatory response and cardiac dysfunction. To this end, we
pre-treated RAW264.7 macrophages with GW4869, an inhibitor of exosome
biogenesis/release, followed by endotoxin (LPS) challenge. In vivo, we injected
wild-type (WT) mice with GW4869 for 1h prior to endotoxin treatment or cecal
ligation/puncture (CLP) surgery. We observed that pre-treatment with GW4869
significantly impaired release of both exosomes and pro-inflammatory cytokines
(TNF-?, IL-1?, IL-6) in RAW264.7 macrophages. At 12h after LPS treatment or CLP
surgery, WT mice pre-treated with GW4869 displayed lower amounts of exosomes and
pro-inflammatory cytokines in the serum than control PBS-injected mice.
Accordingly, GW4869 treatment diminished the sepsis-induced cardiac inflammation,
attenuated myocardial depression and prolonged survival. Together, our findings
indicate that blockade of exosome generation in sepsis dampens the
sepsis-triggered inflammatory response and thereby, improves cardiac function and
survival.