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2018 ; 2
(6
): 638-648
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Platelet HMGB1 is required for efficient bacterial clearance in intra-abdominal
bacterial sepsis in mice
#MMPMID29563120
Zhou H
; Deng M
; Liu Y
; Yang C
; Hoffman R
; Zhou J
; Loughran PA
; Scott MJ
; Neal MD
; Billiar TR
Blood Adv
2018[Mar]; 2
(6
): 638-648
PMID29563120
show ga
Thrombocytopenia impairs host defense and hemostasis in sepsis. However, the
mechanisms of how platelets regulate host defense are not fully understood.
High-mobility group box 1 (HMGB1), a danger-associated molecular pattern protein,
is released during infection and contributes to the pathogenesis of sepsis.
Platelets express HMGB1, which is released on activation and has been shown to
play a critical role in thrombosis, monocyte recruitment, and neutrophil
extracellular trap (NET) production. However, the contribution of platelet HMGB1
to host defense is unknown. To determine the role of platelet HMGB1 in
polymicrobial sepsis, platelet-specific HMGB1 knockout (HMGB1 platelet factor 4
[PF4]) mice were generated and were subjected to cecal ligation and puncture
(CLP), a clinically relevant intra-abdominal sepsis model. Compared with HMGB1
Flox mice and wild-type (WT) mice, HMGB1 PF4 mice showed significantly higher
bacterial loads in the peritoneum and blood, an exaggerated systemic inflammation
response, and significantly greater mortality after CLP. Deletion of HMGB1 in
platelets was associated with lower platelet-derived chemokines (PF4 and RANTES)
in the peritoneal cavity, and a decrease of platelet-neutrophil interaction in
the lung after CLP. In vitro, neutrophils cocultured with activated HMGB1
knockout platelets showed fewer platelet-neutrophil aggregates, reduced reactive
oxygen species (ROS) burst as compared with control. Taken together, these data
reveal an unrecognized role of platelet HMGB1 in the regulation of neutrophil
recruitment and activation via modulation of platelet activation during sepsis.