RATIONALE AND OBJECTIVES: We sought to determine whether there is a species dependence on plasma protein and serum album binding and/or relaxivity of the MR contrast agent MS-325. METHODS: Equilibrium binding of MS-325 to plasma proteins or purified serum albumin was determined as a function of chelate concentration. T1 and T2 values were determined at 0.47 and 1.41 T, and NMRD profiles were measured to determine the changes in relaxivity over varying field strengths from 0.002 to 1.2 T. RESULTS: The binding of MS-325 to either animal plasma or serum albumin plateaus at chelate concentrations less than 0.1 mM with human, pig, and rabbit plasmas showing maximum binding. Human and pig plasmas show the greatest observed relaxivity enhancement in the presence of MS-325. CONCLUSIONS: MS-325 exhibits increased relaxivity in blood plasma as the result of plasma protein binding. Binding ranged from 64% to 91% and was species dependent: human > pig approximately rabbit > dog approximately rat approximately mouse.
RATIONALE AND OBJECTIVES: We sought to determine whether there is a species dependence on plasma protein and serum album binding and/or relaxivity of the MR contrast agent MS-325. METHODS: Equilibrium binding of MS-325 to plasma proteins or purified serum albumin was determined as a function of chelate concentration. T1 and T2 values were determined at 0.47 and 1.41 T, and NMRD profiles were measured to determine the changes in relaxivity over varying field strengths from 0.002 to 1.2 T. RESULTS: The binding of MS-325 to either animal plasma or serum albumin plateaus at chelate concentrations less than 0.1 mM with human, pig, and rabbit plasmas showing maximum binding. Human and pig plasmas show the greatest observed relaxivity enhancement in the presence of MS-325. CONCLUSIONS:MS-325 exhibits increased relaxivity in blood plasma as the result of plasma protein binding. Binding ranged from 64% to 91% and was species dependent: human > pig approximately rabbit > dog approximately rat approximately mouse.
Authors: Johanna C Nissen; Ulrike I Attenberger; Christian Fink; Olaf Dietrich; Martin Rohrer; Stefan O Schoenberg; Henrik J Michaely Journal: Eur Radiol Date: 2009-03-13 Impact factor: 5.315
Authors: Sydney B Montesi; Rohan Rao; Lloyd L Liang; Hannah E Goulart; Amita Sharma; Subba R Digumarthy; Barry S Shea; Ravi T Seethamraju; Peter Caravan; Andrew M Tager Journal: Eur Respir J Date: 2018-05-17 Impact factor: 16.671