Physics – Biological Physics
Scientific paper
2007-04-28
Biophysical Journal 91, 12 (15/12/2006) 4598
Physics
Biological Physics
Scientific paper
10.1529/biophysj.106.089771
Tracking individual nano-objets in live cells during arbitrary long times is an ubiquitous need in modern biology. We present here a method for tracking individual 5 nm gold nanoparticles on live cells. It relies on the photothermal effect and the detection of the Laser Induced Scattering around a NanoAbsorber (LISNA). The key point for recording trajectories at video rate is the use of a triangulation procedure. The effectiveness of the method is tested against Single fluorescent Molecule Tracking in live COS7 cells on subsecond time scales. We further demonstrate recordings for several minutes of AMPA receptors trajectories on the plasma membrane of live neurons. SNaPT has the unique potential to record arbitrary long trajectory of membrane proteins using non-fluorescent nanometer sized labels.
Berciaud Stéphane
Blab Gerhard A.
Choquet Daniel
Cognet Laurent
Groc Laurent
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