Mr. Pieterjan Debie Profile

Pieterjan Debie

at Vrije Univ Brussel

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Publications (4)

Proceedings Article | 17 March 2023 Presentation

In vivo optical imaging using a novel fluorescently-labeled single-domain antibody targeting a universal tumor marker

Lukasz Mateusiak, Sam Floru, Janne Wouters, Timo De Groof, Noemi Declerck, Simone Janssen, Pieterjan Debie, Katty Zeven, Janik Puttemans, Karine Breckpot, Nick Devoogdt, Sophie Hernot

Proceedings Volume PC12361, PC123610F (2023) https://doi.org/10.1117/12.2649171

KEYWORDS: Tumors, In vivo imaging, Optical imaging, Image-guided intervention, Tissues, Surgery, Cancer, Molecules, Molecular imaging, Visualization

Proceedings Article | 1 April 2020 Presentation

Design and preclinical evaluation of a single-label bimodal nanobody tracer for image-guided surgery (Conference Presentation)

Pieterjan Debie, Bieke De Sloovere, Danny van Willigen, Fijs W. van Leeuwen, Catarina Xavier, Nick Devoogdt, Tony Lahoutte, Sophie Hernot

Proceedings Volume 11362, 113620W (2020) https://doi.org/10.1117/12.2553064

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Intraoperative guidance using targeted near-infrared (NIR) fluorescent tracers can provide surgeons with real-time feedback on the presence of residual tumour tissue. To overcome the still limited depth penetration of NIR light, and limit potentially missing residual occult or deeper lying lesions, the combination of fluorescence with nuclear imaging is proposed. We describe the design and preclinical validation of the anti-HER2 nanobody 2Rs15d, conjugated with a ‘multifunctional single attachment point’ (MSAP), which integrates a Cy5 fluorophore and diethylenetriaminepentaacetic acid (DTPA) chelator into a single label. After random conjugation to primary amines in the nanobody, functionality of the tracer and stability after 111In labelling were evaluated in vitro. Using SKOV3 (HER2+) and MDA-MB-435S (HER2-) xenografted mice, the in vivo biodistribution of 2Rs15d-MSAP.111In was determined by SPECT/CT (1h post-injection) and fluorescence imaging (1h30 post-injection). Ensuing, the ex vivo biodistribution was determined 2h (both xenograft models) and 24h post-injection (SKOV3 only). The tracer retained its affinity after conjugation of the MSAP and remained stable over 24h in both PBS and human serum after 111In labelling. The in vivo SPECT/CT and fluorescence images corresponded well, showing the expected biodistribution pattern for nanobody tracers, meaning low background except for high renal uptake due to clearance, and specific tumour uptake in HER2-overexpressing tumours. Ex vivo biodistribution data revealed a SKOV3 tumour-specific uptake of 7.0 ± 2.5 %ID/g after 2h, significantly higher than 1.1 ± 1.2 %ID/g for control tumours. The tumour-to-blood ratio was 47.6± 25.4, tumour-to-muscle ratio 23.2 ± 11.6, and tumour-to-liver ratio 6.9 ± 3.7. After 24h SKOV3 tumour uptake was 5.6 ± 1.9 %ID/g, tumour-to-blood ratio 229.1 ± 85.1, tumour-to-muscle ratio 16.8 ± 8.0, and tumour-to-liver ratio 5.1 ± 1.9. In conclusion, functional bimodal nuclear/fluorescent nanobody-tracers can be conveniently generated by conjugation of a single-molecule MSAP-reagent carrying both fluorophore and a chelator.

Proceedings Article | 7 March 2019 Presentation + Paper

A proof-of-concept fluorescence lifetime camera based on a novel gated image sensor for fluorescence-guided surgery

H. Ingelberts, T. Lapauw, P. Debie, S. Hernot, M. Kuijk

Proceedings Volume 10862, 108620C (2019) https://doi.org/10.1117/12.2507803

KEYWORDS: Cameras, Luminescence, Near infrared, Quantum efficiency, Imaging systems, Image sensors, Surgery, Video, Fluorescence lifetime imaging, Picosecond phenomena

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Proceedings Article | 27 April 2016 Paper

NIR fluorescence lifetime sensing through a multimode fiber for intravascular molecular probing

H. Ingelberts, S. Hernot, P. Debie, T. Lahoutte, M. Kuijk

Proceedings Volume 9887, 98871M (2016) https://doi.org/10.1117/12.2227530

KEYWORDS: Luminescence, Sensors, Near infrared, Arteries, Signal detection, Multimode fibers, Beam splitters, Optical filters, CMOS sensors, Fiber optics

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