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Tandem fluorescence and Raman (fluoRaman) characterisation of a novel photosensitiser in colorectal cancer cell line SW480

Gala de Pablo, Julia; Chisholm, David R.; Steffen, Andreas; Nelson, Amanda K.; Mahler, Christoph; Marder, Todd B.; Peyman, Sally A.; Girkin, John M.; Ambler, Carrie A.; Whiting, Andrew; Evans, Stephen D.

Tandem fluorescence and Raman (fluoRaman) characterisation of a novel photosensitiser in colorectal cancer cell line SW480 Thumbnail


Authors

Julia Gala de Pablo

David R. Chisholm

Andreas Steffen

Amanda K. Nelson

Christoph Mahler

Todd B. Marder

Sally A. Peyman

Andrew Whiting

Stephen D. Evans



Abstract

The development of new imaging tools, molecules and modalities is crucial to understanding biological processes and the localised cellular impact of bioactive compounds. A small molecule photosensitiser, DC473, has been designed to be both highly fluorescent and to exhibit a strong Raman signal in the cell-silent region of the Raman spectrum due to a diphenylacetylene structure. DC473 has been utilised to perform a range of novel tandem fluorescence and Raman (fluoRaman) imaging experiments, enabling a thorough examination of the compound's cellular localisation, exemplified in colorectal cancer cells (SW480). This multifunctional fluoRaman imaging modality revealed the presence of the compound in lipid droplets and only a weak signal in the cytosol, by both Raman and fluorescence imaging. In addition, Raman microscopy detected the compound in a cell compartment we labelled as the nucleolus, whereas fluorescence microscopy did not detect the fluoRaman probe due to solvatochromatic effects in a local polar environment. This last finding was only possible with the use of tandem confocal Raman and fluorescence methods. By following the approach detailed herein, incorporation of strong Raman functional groups into fluorophores can enable a plethora of fluoRaman experiments, shedding further light on potential drug compound's cellular behaviour and biological activity.

Citation

Gala de Pablo, J., Chisholm, D. R., Steffen, A., Nelson, A. K., Mahler, C., Marder, T. B., …Evans, S. D. (2018). Tandem fluorescence and Raman (fluoRaman) characterisation of a novel photosensitiser in colorectal cancer cell line SW480. Analyst, 143(24), 6113-6120. https://doi.org/10.1039/c8an01461b

Journal Article Type Article
Acceptance Date Nov 1, 2018
Online Publication Date Nov 23, 2018
Publication Date Dec 21, 2018
Deposit Date Dec 5, 2018
Publicly Available Date Mar 29, 2024
Journal Analyst
Print ISSN 0003-2654
Electronic ISSN 1364-5528
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 143
Issue 24
Pages 6113-6120
DOI https://doi.org/10.1039/c8an01461b

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