PUBLICATION
Intrinsically Fluorescent, Stealth Polypyrazoline Nanoparticles with Large Stokes Shift for In Vivo Imaging
- Authors
- Mane, S.R., Hsiao, I.L., Takamiya, M., Le, D., Straehle, U., Barner-Kowollik, C., Weiss, C., Delaittre, G.
- ID
- ZDB-PUB-180807-4
- Date
- 2018
- Source
- Small (Weinheim an der Bergstrasse, Germany) 14(36): e1801571 (Journal)
- Registered Authors
- Strähle, Uwe, Takamiya, Masanari
- Keywords
- nanomedicine, photopolymerization, tetrazole, visible light, zebrafish
- MeSH Terms
-
- Animals
- Biocompatible Materials/chemistry
- Diagnostic Imaging/methods*
- Embryo, Nonmammalian/metabolism
- Fluorescence
- Human Umbilical Vein Endothelial Cells/cytology
- Humans
- Hydrodynamics
- Nanoparticles/chemistry*
- Nanoparticles/ultrastructure
- Polymers/chemical synthesis
- Polymers/chemistry
- Pyrazoles/chemical synthesis
- Pyrazoles/chemistry*
- Zebrafish/embryology
- PubMed
- 30079605 Full text @ Small
Citation
Mane, S.R., Hsiao, I.L., Takamiya, M., Le, D., Straehle, U., Barner-Kowollik, C., Weiss, C., Delaittre, G. (2018) Intrinsically Fluorescent, Stealth Polypyrazoline Nanoparticles with Large Stokes Shift for In Vivo Imaging. Small (Weinheim an der Bergstrasse, Germany). 14(36):e1801571.
Abstract
Recent advances in super-resolution microscopy and fluorescence bioimaging allow exploring previously inaccessible biological processes. To this end, there is a need for novel fluorescent probes with specific features in size, photophysical properties, colloidal and optical stabilities, as well as biocompatibility and ability to evade the reticuloendothelial system. Herein, novel fluorescent nanoparticles are introduced based on an inherently fluorescent polypyrazoline (PPy) core and a polyethylene glycol (PEG) shell, which address all aforementioned challenges. Synthesis of the PPy-PEG amphiphilic block copolymer by phototriggered step-growth polymerization is investigated by NMR spectroscopy, size-exclusion chromatography, and mass spectrometry. The corresponding nanoparticles are characterized for their luminescent properties and hydrodynamic size in various aqueous environments (e.g., cell culture media). PPy nanoparticles particularly exhibit a large Stokes shift (Δλ = 160 nm or Δν > 7000 cm-1 ) with visible light excitation and strong colloidal stability. While clearance by macrophages and endothelial cells is minimal, PPy displays good biocompatibility. Finally, PPy nanoparticles prove to be long circulating when injected in zebrafish embryos, as observed by in vivo time-lapse fluorescence microscopy. In summary, PPy nanoparticles are highly promising to be further developed as fluorescent nanodelivery systems with low toxicity and exquisite retention in the blood stream.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping