Imaging diffusion in living cells using time-correlated single-photon counting

Roth CM, Heinlein PI, Heilemann M, Herten D-P (2007)
ANALYTICAL CHEMISTRY 79(19): 7340-7345.

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Abstract
Current efforts to monitor the diffusion of proteins in living cells are based on either fluorescence correlation spectroscopy (FCS), fluorescence recovery after photobleaching, or image correlation spectroscopy. However, these methods cannot generate a map of diffusion times. Here, we introduce a new method termed diffusion imaging microscopy that combines scanning confocal microscopy, time-correlated single-photon counting, and FCS and thus allows us to measure spatially resolved diffusion times. In our approach, we record scan images with time-resolved photon streams within each individual pixel. By extending the pixel dwell time to 25-100 ms, a software correlation of individual photons within each pixel yields the average diffusion time. Additionally, information on fluorescence intensity (number of photons) and fluorescence lifetime is available and can be used to sort fluorescence photons and to discriminate from autofluorescence. We evaluated our method by measuring diffusion times of dT(20)-TMR in solutions of different viscosity. We further demonstrate the applicability of the method to living cells and recorded a diffusion map of a living 3T3 mouse fibroblast incubated with dT(20)-ATIP0488.
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Roth CM, Heinlein PI, Heilemann M, Herten D-P. Imaging diffusion in living cells using time-correlated single-photon counting. ANALYTICAL CHEMISTRY. 2007;79(19):7340-7345.
Roth, C. M., Heinlein, P. I., Heilemann, M., & Herten, D. - P. (2007). Imaging diffusion in living cells using time-correlated single-photon counting. ANALYTICAL CHEMISTRY, 79(19), 7340-7345.
Roth, C. M., Heinlein, P. I., Heilemann, M., and Herten, D. - P. (2007). Imaging diffusion in living cells using time-correlated single-photon counting. ANALYTICAL CHEMISTRY 79, 7340-7345.
Roth, C.M., et al., 2007. Imaging diffusion in living cells using time-correlated single-photon counting. ANALYTICAL CHEMISTRY, 79(19), p 7340-7345.
C.M. Roth, et al., “Imaging diffusion in living cells using time-correlated single-photon counting”, ANALYTICAL CHEMISTRY, vol. 79, 2007, pp. 7340-7345.
Roth, C.M., Heinlein, P.I., Heilemann, M., Herten, D.-P.: Imaging diffusion in living cells using time-correlated single-photon counting. ANALYTICAL CHEMISTRY. 79, 7340-7345 (2007).
Roth, Christian M., Heinlein, Pia I., Heilemann, Mike, and Herten, Dirk-Peter. “Imaging diffusion in living cells using time-correlated single-photon counting”. ANALYTICAL CHEMISTRY 79.19 (2007): 7340-7345.
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