A bivalent activatable fluorescent probe for screening and intravital imaging of chemotherapy-induced cancer cell death

Angew. Chem. Int. Ed. 2022, doi: 10.1002/anie.202113020

Time-course intravital images of cisplatin-treated mammary tumours highlighting ECFP+ cancer cells (blue), EGFP+ macrophages (green) and apoptotic cells after in vivo administration of Apotracker Red (red). A recruited macrophage moves towards apoptotic tumour cells, whereas the white circles feature a macrophage in close proximity to Apotracker Red-stained tumour cells. Scale bar: 30 µm.

Photoactivatable metabolic warheads enable precise and safe ablation of target cells in vivo

Nat. Commun. 2021, doi: 10.1038/s41467-021-22578-2

LEFT VIDEO: Recording of swimming motion of a representative 3 dpf zebrafish larva after treatment with SeNBD-glucose (compound 15) and light irradiation. Larvae were placed in a 10‐cm Petri dish filled with Danieau’s solution.

RIGHT VIDEO:
 Heartbeat monitoring of a representative 3 dpf zebrafish larva after treatment with SeNBD-glucose (compound 15) and light irradiation. Larvae were anesthetized with MS222 and mounted sideways in 3% methylcellulose for continuous heartbeat recording using a Hamamatsu camera (40 frames per second).

A palette of minimally-tagged sucrose analogues for real-time Raman imaging of intracellular plant metabolism

Angew. Chem. Int. Ed. 2021doi: 10.1002/anie.202016802

LEFT VIDEO: Recording of BY2 cells after co-incubation of sucrose and alkyne-sucrose 6. Longitudinal Raman imaging was acquired at 2,116 cm-1 (10 frames per second).

 

RIGHT VIDEO: Recording of BY2 cells after incubation with alkyne-sucrose 6 alone. Longitudinal Raman imaging was acquired at 2,116 cm-1 (10 frames per second).

A fluorogenic cyclic peptide for imaging and quantification of drug-induced apoptosis.

Nat. Commun. 2020doi: 10.1038/s41467-020-17772-7

LEFT VIDEO: Early-stage imaging of BL-2 cells undergoing apoptosis with Apo-15. Human BL-2 cells were UV-irradiated (300 mJ cm-2) and incubated for 3 h at 37°C and 5% CO2. Time-lapse wash-free imaging was performed immediately after addition of Apo-15 (100 nM) using a spinning-disk microscope (Andor) under live-cell conditions (exc.: 488 nm, em.: 525 nm). Images were acquired every 30 s for up to 15 min. Scale bar 10 µm.

 

RIGHT VIDEO: Apo-15 labels subcellular material from apoptotic neutrophils. Neutrophils were isolated from the peripheral blood of healthy volunteers with Percoll density gradient and treated with R-roscovitine (20 µM) prior to imaging. Time-lapse wash-free imaging was performed immediately after addition of Apo-15 (100 nM) using a spinning-disk microscope (Andor) under live-cell conditions (exc.: 488 nm, em.: 525 nm). Images were acquired every 1 s for up to 10 min. Scale bar: 10 µm.

LEFT VIDEO: Time-lapse TIRF microscopy movie corresponding to multiple particle tracking in untreated normoxic HeLa cells after incubation with compound 10 (100 uM). Time is indicated as seconds and images were acquired every 50 ms and played at 30 frames per second. Scale bar: 5 µm.

 

RIGHT VIDEO: Time-lapse TIRF microscopy movie corresponding to multiple particle tracking in DMOG-treated hypoxic HeLa cells  after incubation with compound 10 (100 uM). Time is indicated as seconds and images were acquired every 50 ms and played at 30 frames per second. Scale bar: 5 µm.

Chemical modulation of in vivo macrophage function with subpopulation-specific fluorescent prodrug conjugates.

ACS Cent. Sci., 2017, doi:10.1021/acscentsci.7b00262

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LEFT VIDEO: Time-lapse video showing mCherry-expressing macrophages at the wound edge at 28 h post wounding and 24 h post compound 5 administration. Several mCherry-expressing macrophages contain fluorescent phagosomes (yellow arrows) and they show  rounded morphology and immobile phenotype, suggesting that these cells are undergoing cell death. Scale bar: 50 μm.

RIGHT VIDEO: Time-lapse video showing mCherry-expressing macrophages at the wound edge within 4 h post wounding and 30 min of compound 5 administration. White arrows point at only few macrophages containing fluorescent phagosomes. Macrophages are still actively engulfing and moving, suggesting that they are still viable at this stage. Scale bar: 50 μm

Spacer-free BODIPY fluorogens in antimicrobial peptides for direct imaging of fungal infection in human tissue.

Nat. Commun., 2016, doi: 10.1038/ncomms10940.

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LEFT VIDEO:  Time-lapse high-resolution imaging of A. fumigatus upon treatment with the peptide 8. A. fumigatus were pre-treated with a cell membrane counterstain (red signal) and imaged under confocal microscope. After 20 s, cells were treated with the peptide 8 (2 μM, green signal) and further imaged without any washing. The movie shows the rapid fluorogenic response of 8 upon interaction with the fungal cell membrane and subsequent internalisation in lipophilic environments. Scale bar: 2.5 μm. 

CENTER VIDEO:  3D projection of fluorescence images of A. fumigatus after incubation with the peptide 8. Peptide 8 (2 μM) was incubated for 15 min in A. fumigatus that had been not pretreated with PAF26, and cells were imaged under a confocal microscope at 37 °C. Scale bar: 10 μm.

RIGHT VIDEO:  3D projection of fluorescence images of PAF26 pre-treated A. fumigatus after incubation with the peptide8. Peptide 8 (2 μM) was incubated for 15 min in A. fumigatus that had been pre-treated with PAF26 (3 μM) for 30min, and cells were imaged under a confocal microscope at 37 °C. Scale bar: 10 μm.

Multicomponent Reactions for de Novo Synthesis of BODIPY Probes: in vivo Imaging of Phagocytic Macrophages.

J. Am. Chem. Soc., 2013, doi:10.1021/ja408093p

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LEFT VIDEO:   Time-lapse movie of the flank region of a 3 dpf Tg(cfms:mCherry) larva incubated with PhagoGreen. The movie shows the active engulfing behaviour of macrophages. Yellow arrows point at macrophages (strong red fluorescence) containing mature phagosomes (strong green fluorescence), and red arrows point at pigment cells (weak red fluorescent).

RIGHT VIDEO:   Time-lapse movie of a single macrophage in the flank region of a 3 dpf Tg(cfms:mCherry) larva after incubation with PhagoGreen. The movie shows the strong green signal of PhagoGreen only in mature phagosomes (i.e. phagosomes upon acidification) compared to the non-stained newly formed phagosomes (yellow arrows). Scale bar: 20 μm.