Photodegradable Supramolecular Hydrogels with Fluorescence Turn-On Reporter for Photomodulation of Cellular Microenvironments
摘要:
Photodegradable hydrogels that allow 3D encapsulation of cells are important biomaterials to modulate cellular microenvironments with temporal and spatial resolution. Herein we report a photodegradable hydrogel formed by the self-assembly of short peptides modified with a novel phototrigger. The phototrigger is a biaryl-substituted tetrazole moiety that, upon mild light irradiation, undergoes rapid intramolecular photoclick ligation to form a highly fluorescent pyrazoline moiety. Short peptides linked with a tetrazole-containing moiety, Tet(I) or Tet(II), are able to self-assemble into hydrogels, among which the Tet(I)-GFF and Tet(II)-GFRGD gels show good mechanical strength and biocompatibility for 3D encapsulation and prolonged culture of live cells. The phototriggered tetrazole-to-pyrazoline transformation generates a highly fluorescent reporter and induces the disassembly of the hydrogel matrix by disturbing the balance between hydrophilic interaction and it-if stacking of the self-assembled system. Photomodulation of cellular microenvironments was demonstrated not only for the cells grown on top of the gel but also for stem cells encapsulated inside the hydrogels.
Star polymer synthesis via λ-orthogonal photochemistry
作者:Kai Hiltebrandt、Michael Kaupp、Edgar Molle、Jan P. Menzel、James P. Blinco、Christopher Barner-Kowollik
DOI:10.1039/c6cc03848d
日期:——
We introduce a light induced sequence enabling 𝝀-orthogonal star polymer formation via an arms-first approach, based on an [small alpha],[small omega]-functional polymer carrying tetrazole and o-methyl benzaldehyde moieties, which upon irradiation can...
作者:Rhushikesh A. Kulkarni、Chloe A. Briney、Daniel R. Crooks、Sarah E. Bergholtz、Chandrasekhar Mushti、Stephen J. Lockett、Andrew N. Lane、Teresa W.‐M. Fan、Rolf E. Swenson、W. Marston Linehan、Jordan L. Meier
DOI:10.1002/cbic.201800651
日期:2019.2
Dysregulated levels of “oncometabolites” fuel cancer by directly stimulating oncogenic signaling. Here we report an optimized photoinducible 1,3‐dipolar cycloaddition that can be used to profile dysregulated fumarate metabolism in patient tumor samples, and demonstrate its application in imaging experiments. This intersection of bioorthogonal chemistry and metabolite reactivity could have future application
作者:Kai Hiltebrandt、Thomas Pauloehrl、James P. Blinco、Katharina Linkert、Hans G. Börner、Christopher Barner-Kowollik
DOI:10.1002/anie.201410789
日期:2015.2.23
A photochemical strategy enabling λ‐orthogonal reactions is introduced to construct macromolecular architectures and to encode variable functional groups with site‐selective precision into a single molecule by the choice of wavelength. λ‐Orthogonal pericyclic reactions proceed independently of one another by the selection of functional groups that absorb light of specific wavelengths. The power of
A supramolecularhydrogel formed by dipeptide Gly-Ala linked with biphenyl-substituted tetrazole serves not only as a 3D matrix for livecells, but also as a carrier to deliver microRNA into the encapsulatedcells.
Photodegradable hydrogels that allow 3D encapsulation of cells are important biomaterials to modulate cellular microenvironments with temporal and spatial resolution. Herein we report a photodegradable hydrogel formed by the self-assembly of short peptides modified with a novel phototrigger. The phototrigger is a biaryl-substituted tetrazole moiety that, upon mild light irradiation, undergoes rapid intramolecular photoclick ligation to form a highly fluorescent pyrazoline moiety. Short peptides linked with a tetrazole-containing moiety, Tet(I) or Tet(II), are able to self-assemble into hydrogels, among which the Tet(I)-GFF and Tet(II)-GFRGD gels show good mechanical strength and biocompatibility for 3D encapsulation and prolonged culture of live cells. The phototriggered tetrazole-to-pyrazoline transformation generates a highly fluorescent reporter and induces the disassembly of the hydrogel matrix by disturbing the balance between hydrophilic interaction and it-if stacking of the self-assembled system. Photomodulation of cellular microenvironments was demonstrated not only for the cells grown on top of the gel but also for stem cells encapsulated inside the hydrogels.