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Updated: Apr 13, 2026
Multi-color Localization Microscopy of Single Membrane Proteins in Organelles of Live Mammalian Cells
Published on: June 30, 2018
Fluorophore labeling of core-crosslinked polymeric micelles for multimodal in vivo and ex vivo optical imaging
Yang Shi1, Sijumon Kunjachan, Zhuojun Wu
1Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, Utrecht, The Netherlands.
Aim:
To enable multimodal in vivo and ex vivo optical imaging of the biodistribution and tumor accumulation of core-crosslinked polymeric micelles (CCPMs).
Materials & Methods:
mPEG-b-p(HPMAm-Lac)-based polymeric micelles, core-crosslinked via cystamine and covalently labeled with two different fluorophores (Dy-676/488), were synthesized. The CCPMs were intravenously injected into CT26 tumor-bearing mice.
Results:
Upon intravenous injection, the CCPMs accumulated in CT26 tumors reasonably efficiently, with values reaching approximately 4%ID at 24 h. Ex vivo two-photon laser scanning microscopy confirmed efficient extravasation of the image-guided CCPMs out of tumor blood vessels and relatively deep penetration into the tumor interstitium.
Conclusion:
CCPMs were labeled with multiple fluorophores, and the results obtained exemplify that combining several different in vivo and ex vivo optical imaging techniques is highly useful for analyzing the biodistribution and tumor accumulation of nanomedicines.
