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Erschienen in: Gastric Cancer 1/2015

01.01.2015 | Original Article

Evaluation of the novel near-infrared fluorescence tracers pullulan polymer nanogel and indocyanine green/γ-glutamic acid complex for sentinel lymph node navigation surgery in large animal models

verfasst von: Seong-Ho Kong, Young-Woock Noh, Yun-Suhk Suh, Hye Sun Park, Hyuk-Joon Lee, Keon Wook Kang, Hee Chan Kim, Yong Taik Lim, Han-Kwang Yang

Erschienen in: Gastric Cancer | Ausgabe 1/2015

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Abstract

Background

This study aimed to examine tracers designed to overcome the disadvantages of indocyanine green (ICG), which disperses quickly to multiple lymph nodes, using a near-infrared (NIR) imaging system in animal models.

Methods

Diluted ICG, ICG/poly-γ-glutamic acid (PGA) complex, and IRDye900-conjugated pullulan-cholesterol nanoprobe “near-infrared polynagogel” (NIR-PNG) were injected into the stomachs of dogs and pigs, and the patterns of dispersion were observed using an NIR imaging system. To compare retention times, fluorescence signals were evaluated in the stomach and small bowel of animals 1 week after injection.

Results

A diluted concentration (~0.1 mg/ml) of ICG was optimal for NIR imaging compared with the conventional concentration (5 mg/ml) for visual inspection. When injected into the stomach, the signals of ICG and ICG/PGA complex were relatively large at the injection site, and signals were detected at multiple sentinel nodes and lymph nodes beyond them. The NIR-PNG signal intensity was relatively small at the injection site and limited to only one sentinel node with no additional node. When evaluated 1 week after injection, only the NIR-PNG signal was detected in the canine stomach, and the signal intensity at the lymph nodes of the porcine small bowel was the highest with NIR-PNG, followed by ICG/PGA complex and finally ICG.

Conclusion

NIR-PNG showed the best characteristics of less dispersion and longer retention in the sentinel nodes, and ICG/PGA complex remained longer than diluted ICG. These tracers could potentially be used as optimal tracers for sentinel node navigation surgery in gastric cancer.
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Metadaten
Titel
Evaluation of the novel near-infrared fluorescence tracers pullulan polymer nanogel and indocyanine green/γ-glutamic acid complex for sentinel lymph node navigation surgery in large animal models
verfasst von
Seong-Ho Kong
Young-Woock Noh
Yun-Suhk Suh
Hye Sun Park
Hyuk-Joon Lee
Keon Wook Kang
Hee Chan Kim
Yong Taik Lim
Han-Kwang Yang
Publikationsdatum
01.01.2015
Verlag
Springer Japan
Erschienen in
Gastric Cancer / Ausgabe 1/2015
Print ISSN: 1436-3291
Elektronische ISSN: 1436-3305
DOI
https://doi.org/10.1007/s10120-014-0345-3

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