Tissue plasminogen activator disrupts the blood-brain barrier through increasing the inflammatory response mediated by pericytes after cerebral ischemia.
Aging (Albany NY)
; 11(22): 10167-10182, 2019 11 18.
Article
in En
| MEDLINE
| ID: mdl-31740626
ABSTRACT
Pericytes, important elements of the blood-brain barrier (BBB), play critical roles in maintaining BBB integrity and modulating hemostasis, angiogenesis, inflammation and phagocytic function. We investigated whether pericytes are involved in the recombinant tissue plasminogen activator (rt-PA)-induced inflammatory response, which disrupts the BBB, and investigated the potential mechanisms. Middle cerebral artery occlusion (MCAO) and oxygen-glucose deprivation (OGD) were employed to mimic hypoxic-ischemic conditions. Rt-PA was intravenously injected into mice 1 h after 1 h MCAO, and Rt-PA was added to the culture medium after 4 h OGD. Rt-PA treatment aggravated the disruption of the BBB compared with hypoxia treatment, and etanercept (TNF-α inhibitor) combined with rt-PA alleviated the rt-PA-induced BBB disruption in vivo and in vitro. Rt-PA treatment increased the TNF-α and MCP-1 levels and decreased the TGF-ß, p-Smad2/3 and PDGFR-ß levels compared with hypoxia treatment in vivo and vitro. TGF-ß combined with rt-PA decreased TNF-α and MCP-1 secretion and alleviated BBB disruption compared with rt-PA; these changes were abrogated by TPO427736 HCL (a TGF-ß/p-Smad2/3 pathway inhibitor) cotreatment in vitro. Rt-PA did not decrease TGF-ß and p-Smad2/3 expression in PDGFR-ß-overexpressing pericytes after OGD. These findings identify PDGFR-ß/TGF-ß/p-Smad2/3 signaling in pericytes as a new therapeutic target for the treatment of rt-PA-induced BBB damage.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Blood-Brain Barrier
/
Tissue Plasminogen Activator
/
Pericytes
/
Fibrinolytic Agents
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Tumor Necrosis Factor Inhibitors
/
Inflammation
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Aging (Albany NY)
Journal subject:
GERIATRIA
Year:
2019
Document type:
Article
Affiliation country: