http://scholar.google.com/scholar_url?hl=en&q=http://uknowledge.uky.edu/cgi/viewcontent.cgi%3Farticle%3D1007%26context%3Dnutrisci_etds&sa=X&scisig=AAGBfm1eancpAqIHcifp9WcodG2cd6A3rg&oi=scholaralrt
The blood brain barrier (BBB) is a dynamic interface, mainly consisting of highly
specialized brain microvascular endothelial cells (BMECs) that segregate the
central nervous system (CNS) from the peripheral circulation. Impairment of the BBB, due to
disruption of tight junction (TJ) proteins and inflammatory responses, may initiate and/or
contribute to the progress of CNS disorders, including stroke. Stroke is the second
leading cause of death worldwide. It has been shown that aging and environmental
pollutants can induce brain endothelium dysfunction, and are considered as risk factors
for stroke.
Deficiency of telomerase is highly linked with aging associated vascular diseases.
Evidence indicates that patients with shorter telomere length are at higher risk of heart
disease or stroke. Results in this dissertation address the influence of telomerase reverse
transcriptase (TERT), a key component of telomerase, on the BBB integrity in
the context of ischemic stroke induced brain injury. Our results indicate that aging related
BBB alterations aggregate the stroke outcomes by inducing oxidative stress and
stimulating proinflammatory responses on the brain microvessels.
The ability of the BBB to protect the brain from harmful compounds indicates
that the BBB may be targeted by chemical toxicants in the peripheral circulation.
Polychlorinated biphenyls (PCBs) are persistent organic pollutants that
frequently bind to nanoparticles (NPs) in the environment
. Our results demonstrate that binding PCB153, one of the most abundant PCB congeners in the environment, to silica nanoparticles (PCB153 - NPs) potentiates
cerebrovascular toxicity and stroke outcomes via stimulation
of inflammatory responses and disruption of BBB integrity. These events are mediated by
activation of toll like receptor 4 (TLR4), which subsequently recruits tumor necrosis
factor associated factor 6 (TRAF6) and initiates the production of multiple inflammatory
mediators
No comments:
Post a Comment