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MiR-107 inhibits the sprouting of intersegmental vessels of zebrafish embryos

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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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Funding

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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Authors and Affiliations

Authors

Contributions

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.

All authors read and approved the final manuscript.

Corresponding author

Correspondence to Pooi-Fong Wong.

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Ethics approval

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.

Conflict of interest

The authors declare no competing interests.

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Handling Editor: Jörn Bullerdiek

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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

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