Membrane Tension Maintains Cell Polarity by Confining Signals to the Leading Edge during Neutrophil Migration

Cardiovascular Research Institute and Department of Biochemistry, University of California San Francisco, San Francisco, CA 94143, USA.
Cell (Impact Factor: 32.24). 01/2012; 148(1-2):175-88. DOI: 10.1016/j.cell.2011.10.050
Source: PubMed


Little is known about how neutrophils and other cells establish a single zone of actin assembly during migration. A widespread assumption is that the leading edge prevents formation of additional fronts by generating long-range diffusible inhibitors or by sequestering essential polarity components. We use morphological perturbations, cell-severing experiments, and computational simulations to show that diffusion-based mechanisms are not sufficient for long-range inhibition by the pseudopod. Instead, plasma membrane tension could serve as a long-range inhibitor in neutrophils. We find that membrane tension doubles during leading-edge protrusion, and increasing tension is sufficient for long-range inhibition of actin assembly and Rac activation. Furthermore, reducing membrane tension causes uniform actin assembly. We suggest that tension, rather than diffusible molecules generated or sequestered at the leading edge, is the dominant source of long-range inhibition that constrains the spread of the existing front and prevents the formation of secondary fronts.

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    • "Because sucrose cannot penetrate cell membranes, high-concentrationof the cells. The panels to the right show that the treatment of Taxol caused the redistribution of the microtubules toward the membranes sucrose solution has been used as hypertonic buffer that reduces membrane tension without other metabolic effects in cells91011. We suspected that the lower membrane tension might lead to an increase of the membrane roughness. "
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