Automatic segmentation of lysosomes and analysis of intracellular pH with Radachlorin photosensitizer and FLIM.
Biochem Biophys Res Commun
; 710: 149835, 2024 May 28.
Article
em En
| MEDLINE
| ID: mdl-38574457
ABSTRACT
We report application of the fluorescence lifetime imaging microscopy (FLIM) for analysis of distributions of intracellular acidity using a chlorin-e6 based photosensitizer Radachlorin. An almost two-fold increase of the photosensitizer fluorescence lifetime in alkaline microenvironments as compared to acidic ones allowed for clear distinguishing between acidic and alkaline intracellular structures. Clusterization of a phasor plot calculated from fits of the FLIM raw data by two Gaussian distributions provided accurate automatic segmentation of lysosomes featuring acidic contents. The approach was validated in colocalization experiments with LysoTracker fluorescence in living cells of four established lines. The dependence of photosensitizer fluorescence lifetime on microenvironment acidity allowed for estimation of pH inside the cells, except for the nuclei, where photosensitizer does not penetrate. The developed method is promising for combined application of the photosensitizer for both photodynamic treatment and diagnostics.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fotoquimioterapia
/
Porfirinas
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Fármacos Fotossensibilizantes
Idioma:
En
Revista:
Biochem Biophys Res Commun
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Biochem. biophys. res. commun
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Biochemical and biophysical research communications
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
Federação Russa
País de publicação:
Estados Unidos