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2021 Fiscal Year Annual Research Report

Molecular regulation of blood vessel size by endothelial cells-the role of Marcksl1.

Research Project

Project/Area Number 19K06651
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Phng LiKun  国立研究開発法人理化学研究所, 生命機能科学研究センター, チームリーダー (70794098)

Project Period (FY) 2019-04-01 – 2022-03-31
KeywordsEndothelial cell / Tubulogenesis / Actin cytoskeleton / Blebbing / Haemodynamic forces / Marcksl1
Outline of Annual Research Achievements

The efficient distribution and exchange of gases and solutes to cells and tissues at distal portions of the body are facilitated by tubular organs. In vertebrates, oxygen and metabolites are distributed throughout the body by blood flow pumped through vascular tubes. Endothelial cells (ECs) line the innermost surface of the vessels and are subjected to the mechanical forces of blood flow such as blood pressure and wall shear stress. In this study, we discovered that ECs use the actin cytoskeleton to regulate its shape and vessel structure when they are exposed to blood pressure during lumen formation. By using zebrafish as an animal model, we demonstrated that ECs respond to blood pressure by generating a balanced network of linear and branched actin bundles in its cortex. When we genetically and pharmacologically increased the formation of linear actin bundles in ECs, excessive membrane blebbing (spherical membrane protrusions) and enlarged ECs were induced, leading to abnormally dilated vessels. Our findings therefore highlight the importance of ECs to mechanically resist the deforming forces of blood pressure to regulate blood vessel architecture.

  • Research Products

    (4 results)

All 2021

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (3 results) (of which Invited: 2 results)

  • [Journal Article] Endothelial cell mechanics and blood flow forces in vascular morphogenesis2021

    • Author(s)
      Li-Kun Phng , Heinz-Georg Belting
    • Journal Title

      Seminars in Cell and Developmental Biology

      Volume: 120 Pages: 32-43

    • DOI

      10.1016/j.semcdb.2021.06.005

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Endothelial cell mechanoresponse to haemodynamic forces during vascular tubulogenesis2021

    • Author(s)
      Li-Kun Phng
    • Organizer
      Mathematical Mechanobiology, RIMS Workshop, University of Kyoto, Japan.
    • Invited
  • [Presentation] Role of endothelial cell mechanoresponse to haemodynamic forces in the regulation of vessel morphology2021

    • Author(s)
      Li-Kun Phng
    • Organizer
      EMBO Workshop “Vascular Malformations: from fundamental biology to therapeutic opportunities”. Badalona, Spain.
  • [Presentation] Endothelial cell mechanoresponse to haemodynamic forces during vascular lumenization2021

    • Author(s)
      Li-Kun Phng
    • Organizer
      Cell & Tissue Hydraulics Mini-symposium, Mechanobiology Institute, University of Singapore.
    • Invited

URL: 

Published: 2022-12-28  

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