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Near-infrared fluorescence imaging for noninvasive trafficking of scaffold degradation.

ABSTRACT: Biodegradable scaffolds could revolutionize tissue engineering and regenerative medicine; however, in vivo matrix degradation and tissue ingrowth processes are not fully understood. Currently a large number of samples and animals are required to track biodegradation of implanted scaffolds, and such nonconsecutive single-time-point information from various batches result in inaccurate conclusions. To overcome this limitation, we developed functional biodegradable scaffolds by employing invisible near-infrared fluorescence and followed their degradation behaviors in vitro and in vivo. Using optical fluorescence imaging, the degradation could be quantified in real-time, while tissue ingrowth was tracked by measuring vascularization using magnetic resonance imaging in the same animal over a month. Moreover, we optimized the in vitro process of enzyme-based biodegradation to predict implanted scaffold behaviors in vivo, which was closely related to the site of inoculation. This combined multimodal imaging will benefit tissue engineers by saving time, reducing animal numbers, and offering more accurate conclusions.

SUBMITTER: Kim SH

PROVIDER: S-EPMC3564022 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Near-infrared fluorescence imaging for noninvasive trafficking of scaffold degradation.

Kim Soon Hee SH Lee Jeong Heon JH Hyun Hoon H Ashitate Yoshitomo Y Park Gwangli G Robichaud Kyle K Lunsford Elaine E Lee Sang Jin SJ Khang Gilson G Choi Hak Soo HS

Scientific reports 20130205

Biodegradable scaffolds could revolutionize tissue engineering and regenerative medicine; however, in vivo matrix degradation and tissue ingrowth processes are not fully understood. Currently a large number of samples and animals are required to track biodegradation of implanted scaffolds, and such nonconsecutive single-time-point information from various batches result in inaccurate conclusions. To overcome this limitation, we developed functional biodegradable scaffolds by employing invisible ...[more]

PMID: 23386968

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Project description:PURPOSE:Near-infrared fluorescence (NIRF) imaging has been widely used in preclinical studies; however, its low tissue penetration represents a daunting problem for translational clinical imaging of neurodegenerative diseases. The retina is known as an extension of the central nerve system (CNS), and it is widely considered as a window to the brain. Therefore, the retina can be considered as an alternative organ for investigating neurodegenerative diseases, and an eye represents an ideal NIRF imaging organ, due to its minimal opacity. PROCEDURES:NIRF ocular imaging (NIRFOI), for the first time, was explored for imaging of Alzheimer's disease (AD) via utilizing "smart" fluorescent probes CRANAD-X (X = - 2, - 3, - 30, - 58, and - 102) for amyloid beta (Aβ), and CRANAD-61 for reactive oxygen species (ROS). Mice were intravenously injected the fluorescence dyes and images from the eyes were captured with an IVIS imaging system at different time points. RESULTS:All of the tested NIRF probes could be used to differentiate transgenic AD mice and WT mice, and NIRFOI could provide much higher sensitivity for imaging Aβs than NIRF brain imaging did. Our data suggested that NIRFOI could capture the imaging signals from both soluble and insoluble Aβ species. Moreover, we demonstrated that NIRFOI with CRANAD-102 could be used to monitor the therapeutic effects of BACE-1 inhibitor LY2811376. Compared to NIRF brain imaging, NIRFOI provided a larger change of Aβ levels before and after LY2811376 treatment. In addition, we demonstrated that CRANAD-61 could be used to image reactive oxygen species in the eyes. CONCLUSION:The large detection margin by NIRFOI is very important for both diagnosis and therapy response monitoring. Compared to fluorescence microscopic imaging, NIRFOI captures signals with a wide angle (large field of view (FOV)) and can be used to detect soluble Aβs. We believe that NIRFOI has remarkable translational potential for future human studies and can be a potential imaging technology for fast, cheap, accessible, and reliable screening of AD in the future.

Dataset Information

Near-infrared fluorescence imaging for noninvasive trafficking of scaffold degradation.

Publications

Near-infrared fluorescence imaging for noninvasive trafficking of scaffold degradation.

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