The objective of the biophysical nuclear magnetic resonance (NMR) program is the elucidation of the mechanisms by which chemicals and heavy metals present in the environment cause cell injury. The development and application of NMR methodology in order to achieve this objective may be considered to fall into two broad categories: 1) In vivo metabolic analysis using NMR spectroscopy. Such studies probe directly the metabolism of various xenobiotics when sufficient concentrations are present to permit detection. Additionally, studies of the effects of these agents on metabolic parameters thought to play an important role in the mediation of cell injury are carried out. In addition to measurements of intracellular pH and levels of high energy phosphate compounds, current emphasis is on the measurement of free intracellular calcium levels and on the development of fluorinated NMR active spin traps for the in vivo detection of intracellular free radicals. Cellular calcium levels are measured using a fluorinated calcium chelate in combination with 19F NMR detection. Measurements have been carried out in a variety of cell and perfused organ systems, with current emphasis on red blood cells in which fluorescent calcium sensitive dyes cannot readily be used, and in the perfused heart. Efforts are in progress to develop more specific and sensitive probes for calcium and other cellular cations. 2) In vitro studies of the interaction of various chemicals with known or proposed biological targets. Recent studies have involved the use of 13C labeled antifolate drugs, particularly (2-13C) methotrexate, with the enzyme dihydrofolate reductase. Studies of the biosynthesis of tabtoxin, an inhibitor of glutamine synthetase produced by Pseudomouos syringal, have also been carried out.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Intramural Research (Z01)
Project #
1Z01ES010004-07
Application #
3965174
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
7
Fiscal Year
1986
Total Cost
Indirect Cost
Name
U.S. National Inst of Environ Hlth Scis
Department
Type
DUNS #
City
State
Country
United States
Zip Code
Huss, Janice M; Imahashi, Ken-ichi; Dufour, Catherine R et al. (2007) The nuclear receptor ERRalpha is required for the bioenergetic and functional adaptation to cardiac pressure overload. Cell Metab 6:25-37
Delozier, Tracy C; Kissling, Grace E; Coulter, Sherry J et al. (2007) Detection of human CYP2C8, CYP2C9, and CYP2J2 in cardiovascular tissues. Drug Metab Dispos 35:682-8
Murphy, Elizabeth; Steenbergen, Charles (2007) Cardioprotection in females: a role for nitric oxide and altered gene expression. Heart Fail Rev 12:293-300
Murphy, Elizabeth; Steenbergen, Charles (2007) Gender-based differences in mechanisms of protection in myocardial ischemia-reperfusion injury. Cardiovasc Res 75:478-86
Murphy, Elizabeth; Steenbergen, Charles (2007) Preconditioning: the mitochondrial connection. Annu Rev Physiol 69:51-67
Nikolic, Ivana; Liu, Dianxin; Bell, Jamie A et al. (2007) Treatment with an estrogen receptor-beta-selective agonist is cardioprotective. J Mol Cell Cardiol 42:769-80
Shiva, Sruti; Huang, Zhi; Grubina, Rozalina et al. (2007) Deoxymyoglobin is a nitrite reductase that generates nitric oxide and regulates mitochondrial respiration. Circ Res 100:654-61
Seubert, John M; Sinal, Christopher J; Graves, Joan et al. (2006) Role of soluble epoxide hydrolase in postischemic recovery of heart contractile function. Circ Res 99:442-50
Sun, Junhui; Picht, Eckard; Ginsburg, Kenneth S et al. (2006) Hypercontractile female hearts exhibit increased S-nitrosylation of the L-type Ca2+ channel alpha1 subunit and reduced ischemia/reperfusion injury. Circ Res 98:403-11
Sun, Junhui; Steenbergen, Charles; Murphy, Elizabeth (2006) S-nitrosylation: NO-related redox signaling to protect against oxidative stress. Antioxid Redox Signal 8:1693-705

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