What question did this study set out to answer?

Track and quantify the dynamic rearrangements and exchange rates of alpha-actinin within focal adhesions and stress fibers of living cells without disrupting cytoskeletal architecture.

January 1, 2001Cell Motility and the Cytoskeleton

Dynamics of ?-actinin in focal adhesions and stress fibers visualized with ?-actinin-green fluorescent protein

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Authors

MEMagnus EdlundUniversity of North Carolina at Chapel Hill MLMarc A. LotanoUniversity of North Carolina at Chapel Hill COCarol OteyUniversity of North Carolina at Chapel Hill

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Implication

Live-cell imaging study reveals rapid alpha-actinin exchange within focal adhesions and stress fibers of mouse fibroblasts, suggesting shared regulatory mechanisms.

Key Points

Track and quantify the dynamic rearrangements and exchange rates of alpha-actinin within focal adhesions and stress fibers of living cells without disrupting cytoskeletal architecture.
Transfected mouse Swiss 3T3 and BALB/c fibroblasts to express low levels of an alpha-actinin–green fluorescent protein (alpha AGFP) fusion construct to avoid overexpression artifacts.
Characterized protein localization and measured exchange kinetics using high-resolution video-microscopy and fluorescence recovery after photobleaching (FRAP).
Alpha AGFP localized to stress fibers, focal adhesions, microspikes, and lamellipodia, associating with focal adhesions early during assembly and subsequently with stress-fiber dense bodies.
FRAP analysis demonstrated equivalent protein exchange rates and stability in both focal adhesions and stress fibers despite differences in composition between the two structures.
Exchange rates measured by video-microscopy and FRAP were qualitatively faster than previously published rates obtained via microinjection of excess fluorescently tagged protein.

Cite This Study

Edlund et al. (2001) studied this question.

synapsesocial.com/papers/6a17459cfbaa3b4c7a5df7e7 https://doi.org/10.1002/1097-0169(200103)48:3<190::aid-cm1008>3.0.co;2-c

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Implication

Live-cell imaging study reveals rapid alpha-actinin exchange within focal adhesions and stress fibers of mouse fibroblasts, suggesting shared regulatory mechanisms.

Dynamics of ?-actinin in focal adhesions and stress fibers visualized with ?-actinin-green fluorescent protein

Discussion

Member takes

Implication

Key Points

Cite This Study

Dynamics of ?-actinin in focal adhesions and stress fibers visualized with ?-actinin-green fluorescent protein

Discussion

Member takes

Implication

Key Points

Cite This Study

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