This program is aimed at the development and application of in vivo NMR spectroscopic methods for studying metabolism and its perturbation by chemical toxins. A principal focus of these studies has been the development of NMR active, intracellular indicator, molecules to allow determination of metabolic parameters of interest in intact cells. Research has focused on the use of fluorinated indicators as a consequence of the inherent sensitivity of fluorine for NMR detection and the essential absence of background fluorine resonances from untreated cells. We have previously noted that in NMR studies of suspensions of human erythrocytes to which fluorine-containing molecules have been added, there is generally a significant chemical shift difference between intra- and extracellular indicators. Use was made of this shift difference, to study the distribution of various molecules between intra- and extracellular spaces. We have subsequently initiated studies of the transport of fluorinated nucleosides,, making use of magnetization transfer methods which allow the study of rapidly transported molecules under steady state conditions. Erythrocytes have frequently served as models for transport studies since there is generally a minimum of interference due to other metabolic transformations which can complicate the analysis. In addition, we have recently evaluated the use of perfluorotributylamine (FTBA) as an indicator of partial oxygen pressure in vivo. We are evaluating this technique in the gas-compressed vitrectomized rabbit eye; the high precision of this approach has allowed the rate of oxygen flow into the vitreous to be studied in real time. It was found that the vitreous substitute (FTBA) acts as an oxygen reservoir with a pseudo-first order half life of oxygen elimination from FTBA in the intact eye of roughly 60 minutes. NMR studies of the metabolism of polyphosphates by the protozoan Leishmania major, responsible for causing the disease Leishmania, have also continued.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Intramural Research (Z01)
Project #
1Z01ES050110-02
Application #
3876939
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
2
Fiscal Year
1990
Total Cost
Indirect Cost
City
State
Country
United States
Zip Code
Bonini, Marcelo G; Gabel, Scott A; Ranguelova, Kalina et al. (2009) Direct magnetic resonance evidence for peroxymonocarbonate involvement in the cu,zn-superoxide dismutase peroxidase catalytic cycle. J Biol Chem 284:14618-27
Gabel, Scott A; London, Robert E (2008) Ternary borate-nucleoside complex stabilization by ribonuclease A demonstrates phosphate mimicry. J Biol Inorg Chem 13:207-17
Yoshioka, Jun; Imahashi, Kenichi; Gabel, Scott A et al. (2007) Targeted deletion of thioredoxin-interacting protein regulates cardiac dysfunction in response to pressure overload. Circ Res 101:1328-38
Transue, Thomas R; Gabel, Scott A; London, Robert E (2006) NMR and crystallographic characterization of adventitious borate binding by trypsin. Bioconjug Chem 17:300-8
Gabel, Scott A; Walker, Vickie R; London, Robert E et al. (2005) Estrogen receptor beta mediates gender differences in ischemia/reperfusion injury. J Mol Cell Cardiol 38:289-97
Imahashi, Kenichi; London, Robert E; Steenbergen, Charles et al. (2004) Male/female differences in intracellular Na+ regulation during ischemia/reperfusion in mouse heart. J Mol Cell Cardiol 37:747-53
Transue, Thomas R; Krahn, Joseph M; Gabel, Scott A et al. (2004) X-ray and NMR characterization of covalent complexes of trypsin, borate, and alcohols. Biochemistry 43:2829-39
Gao, Guanghua; Prutzman, Kirk C; King, Michelle L et al. (2004) NMR solution structure of the focal adhesion targeting domain of focal adhesion kinase in complex with a paxillin LD peptide: evidence for a two-site binding model. J Biol Chem 279:8441-51
Chen, Jarvis; Petranka, John; Yamamura, Ken et al. (2003) Gender differences in sarcoplasmic reticulum calcium loading after isoproterenol. Am J Physiol Heart Circ Physiol 285:H2657-62
London, Robert E; Gabel, Scott A (2002) Formation of a trypsin-borate-4-aminobutanol ternary complex. Biochemistry 41:5963-7

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