Research Papers: Sensing

Label-free nonenzymatic glycation monitoring of collagen scaffolds in type 2 diabetic mice by confocal Raman microspectroscopy

[+] Author Affiliations
Panpan Shi, Hanping Liu, Xiaoyuan Deng, Ying Jin, Qiannan Wang, Hao Liu, Maosheng Chen, Xue Han

South China Normal University, College of Biophotonics, No. 55 Zhongshan Avenue West, Tianhe District, Guangzhou 510631, China

J. Biomed. Opt. 20(2), 027002 (Feb 11, 2015). doi:10.1117/1.JBO.20.2.027002
History: Received October 22, 2014; Accepted January 13, 2015
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Abstract.  Collagen is the key target of nonenzymatic glycation during physiopathological processes such as diabetes. The induced changes in the biochemical property of collagen by nonenzymatic glycation remain a major challenge to probe. This study investigated the use of confocal Raman microspectroscopy to label-free monitor the nonenzymatic glycation of collagen scaffolds from type 2 diabetic (T2D) mice at different timepoints (0, 4, 8, and 12 weeks). The glycated collagen scaffolds were obtained through the decellularized dermal matrix method to remove the epidermis layer, subcutaneous tissue, and cells in the dermis and to retain the collagen fibrils. Raman spectra showed no changes in Raman peak positions, which indicated that nonenzymatic glycation could produce no significant changes in the triple-helix structure of collagen in T2D mice. However, the relative intensity of the Raman bands at 921, 1033, 1244, 1274, 1346, 1635, and 1672cm1 increased as diabetic time progressed. Correlation analysis suggested that the spectra of these bands had a high positive correlation with the expression of anti-advanced glycation end products obtained by immunofluorescence imaging of the same collagen scaffolds. Confocal Raman microspectroscopy proves a potential tool to label-free monitor the collagen changes caused by nonenzymatic glycation in T2D mice.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Panpan Shi ; Hanping Liu ; Xiaoyuan Deng ; Ying Jin ; Qiannan Wang, et al.
"Label-free nonenzymatic glycation monitoring of collagen scaffolds in type 2 diabetic mice by confocal Raman microspectroscopy", J. Biomed. Opt. 20(2), 027002 (Feb 11, 2015). ; http://dx.doi.org/10.1117/1.JBO.20.2.027002


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