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12 February 2007 Usefulness and limitation of measurement methods for evaluation of tissue-engineered cartilage function and characterization using nanosecond pulsed laser
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Abstract
There is a demand in the field of regenerative medicine for measurement technology that enables determination of functions and characterizations of engineered tissue. Regenerative medicine involving the articular cartilage in particular requires measurement of viscoelastic properties and characterization of the extracellular matrix, which plays a major role in articular cartilage. To meet this demand, we previously proposed a noninvasive method for determination of the viscoelasticity using laser-induced thermoelastic wave (1,2). We also proposed a method for characterization of the extracellular matrix using time-resolved autofluorescence spectroscopy, which could be performed simultaneously with laser-induced thermoelastic wave measurement(3). The purpose of this study was to verify the usefulness and limitation of these methods for evaluation of actual engineered cartilage. 3rd Q-SW Nd:YAG laser pulses, which are delivered through optical fiber, were used for the light source. Laser-induced thermoelastic waves were detected by a sensor consisting of a piezoelectric transducer, which was designed for use in arthroscopy(4). The time-resolved fluorescence spectroscopy was measured by a photonic multichannel analyzer with 4ch digital signal generator. Various tissue-engineered cartilages were developed as samples. Only a limited range of sample thickness could be measured, however, the measured viscoelastic parameters had a positive correlation with culture time, that is, the degree of formation of extracellular matrix(5,6). There were significant differences in the fluorescent parameters among the phenotypic expressions of cartilage because chondrocyte produces specific extracellular matrix as in collagen types depending on its phenotype.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Miya Ishihara M.D., Masato Sato M.D., Nagatoshi Kaneshiro M.D., Genya Mitani M.D., Toshihiro Nagai, Toshiharu Kutsuna, Masayuki Ishihara, Joji Mochida M.D., and Makoto Kikuchi M.D. "Usefulness and limitation of measurement methods for evaluation of tissue-engineered cartilage function and characterization using nanosecond pulsed laser", Proc. SPIE 6439, Optics in Tissue Engineering and Regenerative Medicine, 643909 (12 February 2007); https://doi.org/10.1117/12.701489
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