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Imaging the intracellular distribution of tyrosine kinase inhibitors in living cells with quantitative hyperspectral stimulated Raman scattering.

Authors :
Fu D
Zhou J
Zhu WS
Manley PW
Wang YK
Hood T
Wylie A
Xie XS
Source :
Nature chemistry [Nat Chem] 2014 Jul; Vol. 6 (7), pp. 614-22. Date of Electronic Publication: 2014 May 25.
Publication Year :
2014

Abstract

ABL1 tyrosine-kinase inhibitors (TKI) are front-line therapy for chronic myelogenous leukaemia and are among the best-known examples of targeted cancer therapeutics. However, the dynamic uptake into cells of TKIs of low molecular weight and their intracellular behaviour is unknown because of the difficulty of observing non-fluorescent small molecules at subcellular resolution. Here we report the direct label-free visualization and quantification of two TKI drugs (imatinib and nilotinib) inside living cells using hyperspectral stimulated Raman scattering imaging. Concentrations of both drugs were enriched over 1,000-fold in lysosomes as a result of their lysosomotropic properties. In addition, low solubility appeared to contribute significantly to the surprisingly large accumulation of nilotinib. We further show that the lysosomal trapping of imatinib was reduced more than tenfold when chloroquine is used simultaneously, which suggests that chloroquine may increase the efficacy of TKIs through lysosome-mediated drug-drug interaction in addition to the commonly proposed autophagy-inhibition mechanism.

Details

Language :
English
ISSN :
1755-4349
Volume :
6
Issue :
7
Database :
MEDLINE
Journal :
Nature chemistry
Publication Type :
Academic Journal
Accession number :
24950332
Full Text :
https://doi.org/10.1038/nchem.1961