Water magnetic relaxation dispersion in biological systems: the contribution of proton exchange and implications for the noninvasive detection of cartilage degradation.
Publication/Presentation Date
10-23-2001
Abstract
Magnetic relaxation has been used extensively to study and characterize biological tissues. In particular, spin-lattice relaxation in the rotating frame (T(1rho)) of water in protein solutions has been demonstrated to be sensitive to macromolecular weight and composition. However, the nature of the contribution from low frequency processes to water relaxation remains unclear. We have examined this problem by studying the water T(1rho) dispersion in peptide solutions ((14)N- and (15)N-labeled), glycosaminoglycan solutions, and samples of bovine articular cartilage before and after proteoglycan degradation. We find in model systems and tissue that hydrogen exchange from NH and OH groups to water dominates the low frequency water T(1rho) dispersion, in the context of the model used to interpret the relaxation data. Further, low frequency dispersion changes are correlated with loss of proteoglycan from the extra-cellular matrix of articular cartilage. This finding has significance for the noninvasive detection of matrix degradation.
Volume
98
Issue
22
First Page
12479
Last Page
12484
ISSN
0027-8424
Published In/Presented At
Duvvuri, U., Goldberg, A. D., Kranz, J. K., Hoang, L., Reddy, R., Wehrli, F. W., Wand, A. J., Englander, S. W., & Leigh, J. S. (2001). Water magnetic relaxation dispersion in biological systems: the contribution of proton exchange and implications for the noninvasive detection of cartilage degradation. Proceedings of the National Academy of Sciences of the United States of America, 98(22), 12479–12484. https://doi.org/10.1073/pnas.221471898
Disciplines
Diagnosis | Medicine and Health Sciences | Other Analytical, Diagnostic and Therapeutic Techniques and Equipment | Radiology
PubMedID
11606754
Department(s)
Department of Radiology and Diagnostic Medical Imaging
Document Type
Article