Insights into remote ischemic conditioning miRNA effects on brain
endothelial cells in an oxygen-glucose deprivation stroke model
Abstract
Acute ischemic stroke (AIS) is one of the leading causes of death and
disabilities, and as such, it is of utmost importance to identify novel
treatment options. Current acute treatments for AIS are limited to
either thrombectomy or thrombolysis, both of which must be initiated
within 4.5-6 hours of symptom onset. Remote ischemic conditioning (RIC)
is a promising non-invasive treatment that is thought to activate the
body’s own protective mechanisms against damaging ischemia through
circulating microRNAs (miRNAs). Here, we investigate the transcriptional
changes in human brain microvascular endothelial cells (HBMECs)
transfected with four selected RIC-upregulated miRNAs (RIC-miRNAs),
miR-16-5p, miR-144-3p, miR-182-5p, and miR-451a, under oxygen and
glucose deprivation (OGD) - mimicking the initial stages of AIS.
Pronounced transcriptional changes were present after RIC-miRNA
transfection, with 149 unique downregulated and 212 upregulated
differentially expressed genes in HBMECs after OGD and RIC-miRNA
transfection compared to all other conditions. These genes were involved
in cell cycle regulation, DNA replication and pathways of energy
metabolism. However, we saw no direct effect on cell viability after
RIC-miRNA transfection and OGD. In conclusion, our study suggests that
the selected RIC-miRNAs regulate pathways that may facilitate
endothelial cell recovery and remodeling events from ischemic damage,
offering new therapeutic avenues for AIS.