Jump to main content
Jump to site search

Issue 42, 2020
Previous Article Next Article

Structure-guided discovery of a luminescent theranostic toolkit for living cancer cells and the imaging behavior effect

Author affiliations

Abstract

Dual-functional theranostics are powerful tools that can allow for the in-field understanding of cancer pathology, yet their use is held back by the paucity of suitable theranostics for living systems. Moreover, typical in vitro screening conditions for probe molecules do not necessarily generate candidates that can function effectively in the natural in cellulo environment, limiting their follow-up use in living systems. We introduce herein a general strategy for the development of an iridium(III) theranostic by grafting a well-known inhibitor as a “binding unit” onto an iridium(III) complex precursor as a “signaling unit”. To further optimize their emissive properties, we explored the effect of imaging behavior by incorporating different substituents onto the parental “signaling unit”. This design concept was validated by a series of tailored iridium(III) theranostics 2a–2h for the visualization and inhibition of EGFR in living cancer cells. By comprehensively assessing the theranostic potency of 2a–2h in both in vitro and in cellulo contexts, probe 2f containing electron-donating methoxy groups on the “signaling unit” was discovered to be the most promising candidate theranostic with desirable photophysical/chemical properties. Probe 2f selectively bound to EGFR in vitro and in cellulo, enabling it to selectively discriminate living EGFR-overexpressing cancer cells from normal cells that express low levels of EGFR with an “always-on” luminescence signal output. In particular, its long-lived lifetime enabled its luminescence signal to be readily distinguished from the interfering fluorescence of organic dyes by using time-resolved techniques. Complex 2f simultaneously visualized and inhibited EGFR in a dose-dependent manner, leading to a reduction in the phosphorylation of downstream proteins ERK and MEK, and inhibition of the activity of downstream transcription factor AP1. Notably, complex 2f is comparable to the parental EGFR inhibitor 1b, in terms of both inhibitory activity against EGFR and cytotoxicity against EGFR-overexpressing cancer cells. This tailored dual-functional iridium(III) theranostic toolkit provides an alternative strategy for the personalized diagnosis and treatment of cancers.

Graphical abstract: Structure-guided discovery of a luminescent theranostic toolkit for living cancer cells and the imaging behavior effect

Back to tab navigation

Supplementary files

Article information


Submitted
20 Aug 2020
Accepted
23 Sep 2020
First published
24 Sep 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 11404-11412
Article type
Edge Article

Structure-guided discovery of a luminescent theranostic toolkit for living cancer cells and the imaging behavior effect

C. Wu, K. Wu, J. Liu, W. Wang, C. Leung and D. Ma, Chem. Sci., 2020, 11, 11404
DOI: 10.1039/D0SC04576D

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
  • For reproduction of material from PCCP:
    [Original citation] - Published by the PCCP Owner Societies.
  • For reproduction of material from PPS:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
  • For reproduction of material from all other RSC journals:
    [Original citation] - Published by The Royal Society of Chemistry.

Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.


Social activity

Search articles by author

Spotlight

Advertisements