Combination of a spinning disc confocal unit with frequency-domain fluorescence lifetime imaging microscopy.
Cytometry A
; 71(4): 207-14, 2007 Apr.
Article
em En
| MEDLINE
| ID: mdl-17266147
ABSTRACT
BACKGROUND:
Wide-field frequency-domain fluorescence lifetime imaging microscopy (FLIM) is an established technique to determine fluorescence lifetimes. Disadvantage of wide-field imaging is that measurements are compromised by out-of-focus blur. Conventional scanning confocal typically means long acquisition times and more photo bleaching. An alternative is spinning-disc confocal whereby samples are scanned simultaneously by thousands of pinholes, resulting in a virtually instantaneous image with more than tenfold reduced photo bleaching.METHODS:
A spinning disc unit was integrated into an existing FLIM system. Measurements were made of fluorescent beads with a lifetime of 2.2 ns against a 5.3 ns fluorescent background outside the focal plane. In addition, living HeLa cells were imaged with different lifetimes in the cytosol and the plasma membrane.RESULTS:
In spinning-disc mode, a lifetime of the beads of 2.8 ns was measured, whereas in wide field a lifetime of 4.1 ns was measured. Lifetime contrast within living HeLa cells could be resolved with the spinning-disc unit, where this was impossible in wide field.CONCLUSIONS:
Integration of a spinning-disc unit into a frequency-domain FLIM instrument considerably reduces artifacts, while maintaining the advantages of wide field. For FLIM on objects with 3D lifetime structure, spinning-disc is by far preferable over wide-field measurements.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Microscopia Confocal
/
Microscopia de Fluorescência
Limite:
Humans
Idioma:
En
Revista:
Cytometry A
Ano de publicação:
2007
Tipo de documento:
Article