http://link.springer.com/article/10.1007/s12035-015-9394-9
Abstract
Intracellular
tension is the most important characteristic of neuron polarization as
well as the growth and regeneration of axons, which can be generated by
motor proteins and conducted along the cytoskeleton. To better
understand this process, we created Förster resonance energy transfer
(FRET)-based tension probes that can be incorporated into microfilaments
to provide a real-time measurement of forces in neuron cytoskeletons.
We found that our probe could be used to assess the structural tension
of neuron polarity. Nerve growth factor (NGF) upregulated structural
forces, whereas the glial-scar inhibitors chondroitin sulfate
proteoglycan (CSPG) and aggrecan weakened such forces. Notably, the
tension across axons was distributed uniformly and remarkably stronger
than that in the cell body in NGF-stimulated neurons. The mechanosensors
talin/vinculin could antagonize the effect of glial-scar inhibitors via
structural forces. However, E-cadherin was closely associated with
glial-scar inhibitor-induced downregulation of structural forces.
Talin/vinculin was involved in the negative regulation of E-cadherin
transcription through the nuclear factor-kappa B pathway. Collectively,
this study clarified the mechanism underlying intracellular tension in
the growth and regeneration of axons which, conversely, can be regulated
by talin and E-cadherin.
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