Journal
ULTRAMICROSCOPY
Volume 86, Issue 1-2, Pages 97-106Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-3991(00)00102-9
Keywords
MTLn3; EGF; chemotaxis; AFM; elasticity
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Funding
- NIDCD NIH HHS [NIDCR1 PGO DE 13079] Funding Source: Medline
- PHS HHS [35325] Funding Source: Medline
- NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS [R01DC013079] Funding Source: NIH RePORTER
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The extension of lamellipodia has been triggered by the application of epidermal growth factor (EGF). We have used an atomic force microscope (AFM) to investigate this lamellipodial extension. During extension we could detect an increase in height from about 500 nm for the stable lamellipodium to typical values of 600-800 nm for the extending lamellipodium. The AFM was also used to determine the mechanical properties of the lamellipodium where we found a decrease of the elastic modulus by a factor of 1.4 at the same location within the same cell. Both findings are consistent with the cortical expansion hypothesis, suggesting that severing of actin filaments, leading to a swelling of the cytoskeleton, generates the protrusive force during lamellipodial extension. (C) 2001 Elsevier Science B.V. All rights reserved.
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