Magnetization Transfer Measurements of Exchange Between Hyperpolarized [1-13C]Pyruvate and [1-13C]Lactate in a Murine Lymphoma

被引:90
|
作者
Kettunen, Mikko I. [1 ,2 ]
Hu, De-en [1 ,2 ]
Witney, Timothy H. [1 ,2 ]
McLaughlin, Rebekah [1 ,2 ]
Gallagher, Ferdia A. [1 ,2 ,3 ]
Bohndiek, Sarah E. [1 ,2 ]
Day, Sam E. [1 ,2 ]
Brindle, Kevin M. [1 ,2 ]
机构
[1] Univ Cambridge, Dept Biochem, Cambridge CB2 1GA, England
[2] Li Ka Shing Ctr, Canc Res UK Cambridge Res Inst, Cambridge, England
[3] Univ Cambridge, Dept Radiol, Addenbrookes Hosp, Cambridge CB2 1GA, England
关键词
exchange; pyruvate; hyperpolarization; magnetization transfer; carbon-13; lactate dehydrogenase; DETECTING TUMOR RESPONSE; IN-VIVO; LACTATE-DEHYDROGENASE; REACTION RATES; RIF-1; TUMORS; RESONANCE; PYRUVATE; SPECTROSCOPY; NMR; PH;
D O I
10.1002/mrm.22276
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Measurements of the conversion of hyperpolarized [1-C-13]pyruvate into lactate, in the reaction catalyzed by lactate dehydrogenase, have shown promise as a metabolic marker for the presence of disease and response to treatment. However, it is unclear whether this represents net flux of label from pyruvate to lactate or exchange of isotope between metabolites that are close to chemical equilibrium. Using saturation and inversion transfer experiments, we show that there is significant exchange of label between lactate and pyruvate in a murine lymphoma in vivo. The rate constants estimated from the magnetization transfer experiments, at specific points during the time course of label exchange, were similar to those obtained by fitting the changes in peak intensities during the entire exchange time course to a kinetic model for two-site exchange. These magnetization transfer experiments may therefore provide an alternative and more rapid way of estimating flux between pyruvate and lactate to serial measurements of pyruvate and lactate C-13 peak intensities following injection of hyperpolarized [1-C-13]pyruvate. Magn Reson Med 63:872-880,2010. (C) 2010 Wiley-Liss, Inc.
引用
收藏
页码:872 / 880
页数:9
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