Endothelial progenitor cell transplantation restores vascular injury in mice after whole-brain irradiation
Male
0301 basic medicine
0303 health sciences
Hematopoietic Stem Cell Transplantation
Brain
3. Good health
Capillary Permeability
Mice, Inbred C57BL
Mice
03 medical and health sciences
Blood-Brain Barrier
Animals
Cranial Irradiation
Bone Marrow Transplantation
Endothelial Progenitor Cells
DOI:
10.1016/j.brainres.2020.147005
Publication Date:
2020-07-02T15:11:33Z
AUTHORS (6)
ABSTRACT
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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