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2016 ; 10
(ä): 43
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English Wikipedia
Mechanical Injury Induces Brain Endothelial-Derived Microvesicle Release:
Implications for Cerebral Vascular Injury during Traumatic Brain Injury
#MMPMID26973460
Andrews AM
; Lutton EM
; Merkel SF
; Razmpour R
; Ramirez SH
Front Cell Neurosci
2016[]; 10
(ä): 43
PMID26973460
show ga
It is well established that the endothelium responds to mechanical forces induced
by changes in shear stress and strain. However, our understanding of vascular
remodeling following traumatic brain injury (TBI) remains incomplete. Recently
published studies have revealed that lung and umbilical endothelial cells produce
extracellular microvesicles (eMVs), such as microparticles, in response to
changes in mechanical forces (blood flow and mechanical injury). Yet, to date, no
studies have shown whether brain endothelial cells produce eMVs following TBI.
The brain endothelium is highly specialized and forms the blood-brain barrier
(BBB), which regulates diffusion and transport of solutes into the brain. This
specialization is largely due to the presence of tight junction proteins (TJPs)
between neighboring endothelial cells. Following TBI, a breakdown in tight
junction complexes at the BBB leads to increased permeability, which greatly
contributes to the secondary phase of injury. We have therefore tested the
hypothesis that brain endothelium responds to mechanical injury, by producing
eMVs that contain brain endothelial proteins, specifically TJPs. In our study,
primary human adult brain microvascular endothelial cells (BMVEC) were subjected
to rapid mechanical injury to simulate the abrupt endothelial disruption that can
occur in the primary injury phase of TBI. eMVs were isolated from the media
following injury at 2, 6, 24, and 48 h. Western blot analysis of eMVs
demonstrated a time-dependent increase in TJP occludin, PECAM-1 and ICAM-1
following mechanical injury. In addition, activation of ARF6, a small GTPase
linked to extracellular vesicle production, was increased after injury. To
confirm these results in vivo, mice were subjected to sham surgery or TBI and
blood plasma was collected 24 h post-injury. Isolation and analysis of eMVs from
blood plasma using cryo-EM and flow cytometry revealed elevated levels of
vesicles containing occludin following brain trauma. These results indicate that
following TBI, the cerebral endothelium undergoes vascular remodeling through
shedding of eMVs containing TJPs and endothelial markers. The detection of this
shedding potentially allows for a novel methodology for real-time monitoring of
cerebral vascular health (remodeling), BBB status and neuroinflammation following
a TBI event.