Journal
BRAIN RESEARCH
Volume 1746, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.brainres.2020.147005
Keywords
Radiation-induced brain injury; Vascular damage; EPC transplantation; Blood-brain barrier
Categories
Funding
- National Natural Science Foundation of China [81971166]
- Science and Technology Planning Project of Guangdong Province [2016A020215040]
- Southern China International Cooperation Base for Early Intervention and Functional Rehabilitation of Neurological Diseases [2015B050501003]
- Guangdong Provincial Engineering Center For Major Neurological Disease Treatment
- Guangdong Provincial Translational Medicine Innovation Platform for Diagnosis and Treatment of Major Neurological Disease
- Guangdong Provincial Clinical Research Center for Neurological Diseases
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Vascular damage plays an important role in the pathogenesis of radiation-induced brain injury (RBI). Endothelial progenitor cells (EPCs) are responsible for maintaining and repairing endothelial function, and have become a promising method for the treatment of cerebrovascular diseases. However, whether EPC transplantation plays a protective role in RBI has not been fully elucidated. Therefore, the present study investigated the effects of bone marrow-derived EPC transplantation in a whole-brain irradiation (WBI) mouse model. Mice were divided into the three groups: control group, irradiation group and EPCs group. Phosphate buffered saline or EPCs were intravenously injected into mice one week after irradiation, and brains were analyzed eight weeks after injection. Flow cytometry demonstrated that irradiation led to a significant reduction in the peripheral blood EPC count; however, EPC transplantation led to a significant increase in the circulating EPCs. Intravital two-photon imaging and western blotting demonstrated that EPC transplantation reversed the effects of irradiation by decreasing blood-brain barrier permeability and increasing the expression of tight junction proteins in the brain. Additionally, immunofluorescence staining revealed that the brain microvascular density was higher in the EPCs group than the irradiation group. Therefore, EPC transplantation may restore damage caused by WBI to the blood-brain barrier, tight junctions, and cerebral capillary density. These results highlight the potential beneficial effects of EPC transplantation on vascular damage induced by RBI.
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