Remanent cell traction force in renal vascular smooth muscle cells induced by integrin-mediated mechanotransduction

Lavanya Balasubramanian, Chun Min Lo, James S.K. Sham, Kay Pong Yip

Research output: Contribution to journalArticlepeer-review

Abstract

It was previously demonstrated in isolated renal vascular smooth muscle cells (VSMCs) that integrin-mediated mechanotransduction triggers intracellular Ca2+ mobilization, which is the hallmark of myogenic response in VSMCs. To test directly whether integrin-mediated mechanotransduction results in the myogenic response-like behavior in renal VSMCs, cell traction force microscopy was used to monitor cell traction force when the cells were pulled with fibronectin-coated or low density lipoprotein (LDL)-coated paramagnetic beads. LDL-coated beads were used as a control for nonintegrin-mediated mechanotransduction. Pulling with LDL-coated beads increased the cell traction force by 61 ± 12% (9 cells), which returned to the prepull level after the pulling process was terminated. Pulling with noncoated beads had a minimal increase in the cell traction force (12 ± 9%, 8 cells). Pulling with fibronectin-coated beads increased the cell traction force by 56 ± 20% (7 cells). However, the cell traction force was still elevated by 23 ± 14% after the pulling process was terminated. This behavior is analogous to the changes of vascular resistance in pressure-induced myogenic response, in which vascular resistance remains elevated after myogenic constriction. Fibronectin is a native ligand for α5β1-integrins in VSMCs. Similar remanent cell traction force was found when cells were pulled with beads coated with β1-integrin antibody (Ha2/5). Activation of β1-integrin with soluble antibody also triggered variations of cell traction force and Ca2+ mobilization, which were abolished by the Src inhibitor. In conclusion, mechanical force transduced by α5β1-integrins triggered a myogenic response-like behavior in isolated renal VSMCs.

Original languageEnglish (US)
Pages (from-to)C382-C391
JournalAmerican Journal of Physiology - Cell Physiology
Volume304
Issue number4
DOIs
StatePublished - Feb 15 2013

Keywords

  • Calcium signaling
  • Cell traction force microscopy
  • Myogenic response
  • Paramagnetic bead

ASJC Scopus subject areas

  • Physiology
  • Cell Biology

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