| Improved MR-based characterization of engineered cartilage using multiexponential T(2) relaxation and multivariate analysis. | |
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MedLine Citation:
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PMID: 22287335 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Noninvasive monitoring of tissue quality would be of substantial use in the development of cartilage tissue engineering strategies. Conventional MR parameters provide noninvasive measures of biophysical tissue properties and are sensitive to changes in matrix development, but do not clearly distinguish between groups with different levels of matrix development. Furthermore, MR outcomes are nonspecific, with particular changes in matrix components resulting in changes in multiple MR parameters. To address these limitations, we present two new approaches for the evaluation of tissue engineered constructs using MR, and apply them to immature and mature engineered cartilage after 1 and 5 weeks of development, respectively. First, we applied multiexponential T(2) analysis for the quantification of matrix macromolecule-associated water compartments. Second, we applied multivariate support vector machine analysis using multiple MR parameters to improve detection of degree of matrix development. Monoexponential T(2) values decreased with maturation, but without further specificity. Much more specific information was provided by multiexponential analysis. The T(2) distribution in both immature and mature constructs was qualitatively comparable to that of native cartilage. The analysis showed that proteoglycan-bound water increased significantly during maturation, from a fraction of 0.05 ± 0.01 to 0.07 ± 0.01. Classification of samples based on individual MR parameters, T(1) , T(2) , k(m) or apparent diffusion coefficient, showed that the best classifiers were T(1) and k(m) , with classification accuracies of 85% and 84%, respectively. Support vector machine analysis improved the accuracy to 98% using the combination (k(m) , apparent diffusion coefficient). These approaches were validated using biochemical and Fourier transform infrared imaging spectroscopic analyses, which showed increased proteoglycan and collagen with maturation. In summary, multiexponential T(2) and multivariate support vector machine analyses provide improved sensitivity to changes in matrix development and specificity to matrix composition in tissue engineered cartilage. These approaches show substantial potential for the evaluation of engineered cartilage tissue and for extension to other tissue engineering constructs. Copyright © 2012 John Wiley & Sons, Ltd. |
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Authors:
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David A Reiter; Onyi Irrechukwu; Ping-Chang Lin; Somaieh Moghadam; Sarah Von Thaer; Nancy Pleshko; Richard G Spencer |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-1-29 |
Journal Detail:
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Title: NMR in biomedicine Volume: - ISSN: 1099-1492 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-1-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8915233 Medline TA: NMR Biomed Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2012 John Wiley & Sons, Ltd. |
Affiliation:
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Clinical Research Branch, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA. reiterda@mail.nih.gov. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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