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A Simplified System for Evaluating Cell Mechanosensing and Durotaxis In Vitro
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Published on: August 27, 2015

A motor-driven mechanism for cell-length sensing.

Ida Rishal1, Naaman Kam, Rotem Ben-Tov Perry

  • 1Department of Biological Chemistry, Weizmann Institute of Science, 76100 Rehovot, Israel.

Cell Reports
|July 10, 2012
PubMed
Summary
This summary is machine-generated.

Molecular motors are crucial for cell size control. Disrupting motor proteins like kinesin and dynein heavy chains leads to increased cell length, revealing their role in cellular length sensing.

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Area of Science:

  • Cell Biology
  • Molecular Neuroscience
  • Biophysics

Background:

  • Cell size homeostasis is essential, yet mechanisms for large cells like neurons to sense their length remain unclear.
  • Intracellular transport relies on molecular motors, but their role in length sensing is not well understood.

Purpose of the Study:

  • To investigate the role of molecular motors in intracellular length sensing.
  • To explore how bidirectional motor-dependent signals contribute to cell size homeostasis.

Main Methods:

  • Computational simulations of a negative feedback loop involving bidirectional motor-dependent signals.
  • Application of siRNAs to downregulate kinesin and dynein heavy chains in adult sensory neurons.
  • Analysis of cell length in heterozygous dynein heavy chain 1 mutant sensory neurons and mouse embryonic fibroblasts.

Main Results:

  • Simulations predicted that reduced anterograde or retrograde signals increase cell length.
  • Downregulation of kinesin and/or dynein heavy chains resulted in significantly increased neuron length.
  • Dynein heavy chain 1 mutations and partial downregulation led to elongated sensory neurons and fibroblasts.

Conclusions:

  • Molecular motors play a critical role in sensing and regulating cell length.
  • Bidirectional motor-dependent signals encode spatial information influencing cell size.
  • Disruption of motor proteins provides a novel mechanism for controlling cell growth and size homeostasis.