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Effects of Fluid Shear Stress on a Distinct Population of Vascular Smooth Muscle Cells

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Abstract

Vascular smooth muscle cells (SMCs) are a major cell type involved in vascular remodeling. The various developmental origins of SMCs such as neural crest and mesoderm result in the heterogeneity of SMCs, which plays an important role in vascular remodeling and disease development. Upon vascular injury, SMCs are exposed to blood flow and subjected to fluid shear stress. Previous studies have shown that fluid shear stress inhibits SMC proliferation. However, the effect of shear stress on the subpopulation of SMCs from specific developmental origin and vascular bed is not well understood. Here we investigated how shear stress regulates human aortic SMCs positive for neural crest markers. DNA microarray analysis showed that shear stress modulates the expression of genes involved in cell proliferation, matrix synthesis, cell signaling, transcription and cytoskeleton organization. Further studies demonstrated that shear stress induced SMC proliferation and cyclin D1, downregulated cell cycle inhibitor p21, and activated Akt pathway. Inhibition of PI-3 kinase blocked these shear stress-induced changes. These results suggest that SMCs with neural crest characteristics may respond to shear stress in a different manner. This finding has significant implications in the remodeling and disease development of blood vessels.

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Acknowledgments

We thank Alex Hsiao, Ryan Hoshi and Mike Ichikawa for their excellent assistance in the experiments. This work was supported in part by grants HL083900 and EB012240 from National Institute of Health.

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Authors and Affiliations

  1. Department of Bioengineering, University of California, Berkeley, B108A Stanley Hall, Berkeley, CA, 94720-1762, USA

    Steven Hsu, Julia S. Chu, Aijun Wang & Song Li

  2. UC Berkeley-UCSF Graduate Program in Bioengineering, Berkeley, CA, USA

    Steven Hsu & Song Li

  3. Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

    Fanqing F. Chen

Authors
  1. Steven Hsu
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  2. Julia S. Chu
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  3. Fanqing F. Chen
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  5. Song Li
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Correspondence to Song Li.

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Associate Editors John Shyy and Yingxiao Wang oversaw the review of this article.

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Hsu, S., Chu, J.S., Chen, F.F. et al. Effects of Fluid Shear Stress on a Distinct Population of Vascular Smooth Muscle Cells. Cel. Mol. Bioeng. 4, 627–636 (2011). https://doi.org/10.1007/s12195-011-0205-8

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  • DOI: https://doi.org/10.1007/s12195-011-0205-8

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