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• W2065704678 abstract "Quantifying the diffusive transport of large molecules in avascular cartilage tissue is important both for planning potential pharamacological treatments and for gaining insight into the molecular-scale structure of cartilage. In this work, the diffusion coefficients of gadolinium-DTPA and Gd-labeled versions of four proteins-lysozyme, trypsinogen, ovalbumin, and bovine serum albumin (BSA) with molecular weights of 14,300, 24,000, 45,000, and 67,000, respectively-have been measured in healthy and degraded calf cartilage. The experimental technique relies on the effect of the paramagnetic on the relaxation properties of the surrounding water, combined with the time course of a 1-dimensional spatial profile of the water signal in the cartilage sample. The enhanced technique presented here does not require a prior measurement of the relaxivity of the paramagnetic compound in the sample of interest. The data are expressed as the ratio of the diffusion coefficient of a compound in cartilage to its diffusion coefficient in water. For healthy cartilage, this ratio was 0.34 +/- 0.07 for Gd-DTPA, the smallest compound, and fell to 0.3 +/- 0.1 for Gd-lysozyme, 0.08 +/- 0.04 for Gd-trypsinogen, and 0.07 +/- 0.04 for Gd-ovalbumin. Gd-BSA did not appear to enter healthy cartilage tissue beyond a surface layer. After the cartilage had been degraded by 24-h trypsinization, these ratios were 0.60 +/- 0.03 for Gd-DTPA, 0.40 +/- 0.08 for Gd-lysozyme, 0.42 +/- 0.09 for Gd-trypsinogen, 0.16 +/- 0.14 for Gd-ovalbumin, and 0.11 +/- 0.05 for Gd-BSA. Thus, degradation of the cartilage led to increases in the diffusion coefficient of up to fivefold for the Gd-labeled proteins. These basic transport parameters yield insights on the nature of pore sizes and chemical-matrix interactions in the cartilage tissue and may prove diagnostically useful for identifying the degree and nature of damage to cartilage." @default.
• W2065704678 created "2016-06-24" @default.
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• W2065704678 date "2001-01-01" @default.
• W2065704678 modified "2023-09-23" @default.
• W2065704678 title "Diffusion of Paramagnetically Labeled Proteins in Cartilage: Enhancement of the 1-D NMR Imaging Technique" @default.
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• W2065704678 doi "https://doi.org/10.1006/jmre.2000.2216" @default.
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