Abstract
MicroRNAs (miRNAs) play important roles in various biological processes. Our previous study showed that inhibition of MTOR with rapamycin treatment suppressed human endothelial cell tube formation, concomitant with the down-regulation of miR-107. Similarly, inhibition of Ztor by rapamycin also suppressed vascular development in zebrafish embryos. To gain a better understanding of the role of miR-107 and MTOR in vascular development, the present study sought to validate its function by over-expressing miR-107 in zebrafish embryos via microinjection with mimic miR-107 duplexes. Alkaline phosphatase (ALP) staining was used to visualise blood vessels in the zebrafish embryo, and expressions of Pten, Ztor and Rap1 were investigated by immunoblotting. Over-expression of miR-107 in zebrafish embryos inhibited the sprouting of intersegmental vessels (ISVs) with concomitant down-regulation of phosphorylated Rps6 expression, which confirmed the inhibition of Ztor signalling. As expected, pten, which is the target of miR-107, was down-regulated. Interestingly, Rap1, a small GTPase protein that is involved in intersomitic vessels sprouting during angiogenesis, was also down-regulated when miR-107 was over-expressed. Overall, our findings suggest that miR-107 and Ztor-mediated suppression of vascular development in zebrafish embryo involves Rap1.
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Abbreviations
- ALP:
-
Alkaline phosphatase
- ISVs:
-
Intersegmental vessels
- miRNAs:
-
MicroRNAs
- 3′ UTRs:
-
3′-Untranslated regions
- HIF-1:
-
Hypoxia inducible factor-1
- MTOR:
-
Mammalian target of rapamycin
- PI3K:
-
Phosphatidylinositol-3-OH kinase
- Rps6:
-
Ribosomal protein S6
- Pten:
-
Phosphatase and tensin homolog deleted on chromosome 10
- HUVECs:
-
Human umbilical vein endothelial cells
- Dpf:
-
Day post-fertilisation
- Dpi:
-
Day post-injection
- VEGF:
-
Vascular endothelial growth factor
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This study was supported by the University of Malaya Research Grant (RG500-13HTM) and the Postgraduate Research Grant (PPP) (PG306-2016A).
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KES performed experiments, data analyses and drafted the manuscript.
SMN and WPF conceived and designed the study.
WPF revised the manuscript. SMN provided critical review of the manuscript.
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Animal work was performed in accordance with established European Commission regulation. European Commission Direction (2020) does not regulate earliest animal life-stages as animal studies. Embryos used in this study were all below 5 dpf.
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Khor, ES., Noor, S.M. & Wong, PF. MiR-107 inhibits the sprouting of intersegmental vessels of zebrafish embryos. Protoplasma 259, 691–702 (2022). https://doi.org/10.1007/s00709-021-01695-1
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DOI: https://doi.org/10.1007/s00709-021-01695-1