Role of Protrudin in endothelial cell function

Amita Arora, Annukka M. Kivelä, Juuso H Taskinen, Camilla Raiborg, Vesa Olkkonen

Forskningsoutput: TidskriftsbidragMötesabstraktPeer review


Background and Aims : During angiogenesis, endothelial cells form protrusive sprouts and migrate towards the angiogenic stimulus. Protrudin/ZFYVE27, an endoplasmic reticulum (ER)-anchored protein, is essential for neurite outgrowth. It also promotes invadopodia formation and invasion of breast cancer cells. However, the role of Protrudin in endothelial cell function is not known. In the present study we investigate the role of Protrudin in endothelial cell migration and angiogenesis.
Methods: Various methodologies like in vitro tube formation assay, RNA sequencing, western immunoblotting and confocal imaging were adopted to elucidate the role of Protrudin in endothelial cells.
Results: Our results demonstrate that Protrudin promotes angiogenic tube formation in primary endothelial cells, Human umbilical vein endothelial cells (HUVECs). Analysis and validation of RNA sequencing data revealed cell migration as a prominent cellular function affected in HUVECs upon Protrudin knockdown. Furthermore, knockdown of Protrudin inhibits focal adhesion kinase (FAK) activation in HUVECs and human aortic endothelial cells (HAECs). This is associated with loss of polarized FAK distribution. Protrudin inhibition results in perinuclear accumulation of mTOR and inhibits S6K activation. Furthermore, C57Bl/6J mice with global deletion of Protrudin demonstrate reduced retinal vascular progression at post-natal day 7 (n=5, ∗pConclusions: Overall, our results demonstrate that Protrudin regulates FAK and mTOR/S6K signaling pathways in endothelial cells and provide evidence for a key role of Protrudin in angiogenesis in vitro and in vivo. As Protrudin has been previously known to promote cancer cell invasion, it will be intriguing to further study its role in tumor angiogenesis and neovascularization of arthesclerotic plaques.
StatusPublicerad - aug. 2022
MoE-publikationstypEj behörig

Citera det här