A novel optical method to measure oxygen concentration is proposed based upon the oxygen dependent quenching of the phosphorescence of selected phosphors. The method will be developed for rapid (msec) response to changes in oxygen tension in aqueous solutions and accurate measurement in the range of 10-5 to 10-8 M. Probes will be selected which have suitable lifetimes, are chemically stable and which emit in the green or red spectral region. The advantages of the proposed sensor over existing technology includes stability and sensitivity, especially in the lower range of tissue oxygen concentrations (less than MuM). Several configurations of the instrument will be developed: 1) For measurement of bulk phase oxygen, the probes will be incorporated into oxygen permeable membranes, 2) For measurement of intracellular oxygen, probes will be incorporated into the cell, 3) For measurement of tissue oxygen concentrations, the probes will be incorporated into catheters or needle probes which can be inserted into the tissue. The oxygen sensor will be used to study the oxygen dependence of several important drug metabolizing systems of hepatocytes. These include the microsomal reactions of N-demethylation of ethylmorphine and O-demethylation of p-nitroanisole, peroxisomal oxidation of fatty acids and D-amino acids, and two reactions involved in synthesis and degradation of catacholamines: tyrosine hydroxylase and monoamine oxidase.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM036393-02
Application #
3290275
Study Section
Biophysics and Biophysical Chemistry A Study Section (BBCA)
Project Start
1986-04-01
Project End
1989-03-31
Budget Start
1987-04-01
Budget End
1988-03-31
Support Year
2
Fiscal Year
1987
Total Cost
Indirect Cost
Name
University of Pennsylvania
Department
Type
Schools of Medicine
DUNS #
042250712
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
Vanderkooi, J M; Wright, W W; Erecinska, M (1994) Nitric oxide diffusion coefficients in solutions, proteins and membranes determined by phosphorescence. Biochim Biophys Acta 1207:249-54
Papp, S; King, T E; Vanderkooi, J M (1991) Intrinsic tryptophan phosphorescence as a marker of conformation and oxygen diffusion in purified cytochrome oxidase. FEBS Lett 283:113-6
Wilson, D F; Rumsey, W L; Vanderkooi, J M (1989) Oxygen distribution in isolated perfused liver observed by phosphorescence imaging. Adv Exp Med Biol 248:109-15
Vanderkooi, J M; Berger, J W (1989) Excited triplet states used to study biological macromolecules at room temperature. Biochim Biophys Acta 976:1-27
Papp, S; Vanderkooi, J M (1989) Tryptophan phosphorescence at room temperature as a tool to study protein structure and dynamics. Photochem Photobiol 49:775-84
Green, T J; Wilson, D F; Vanderkooi, J M et al. (1988) Phosphorimeters for analysis of decay profiles and real time monitoring of exponential decay and oxygen concentrations. Anal Biochem 174:73-9
Wilson, D F; Rumsey, W L; Green, T J et al. (1988) The oxygen dependence of mitochondrial oxidative phosphorylation measured by a new optical method for measuring oxygen concentration. J Biol Chem 263:2712-8
Kanagy, C; Vanderkooi, J M; Bonner Jr, W D (1988) Luminescence from the carbon monoxide derivative of Agaricus bispora tyrosinase. Arch Biochem Biophys 267:668-75
Rumsey, W L; Vanderkooi, J M; Wilson, D F (1988) Imaging of phosphorescence: a novel method for measuring oxygen distribution in perfused tissue. Science 241:1649-51
Koloczek, H; Vanderkooi, J M (1987) Domain structural flexibility in rhodanese examined by quenching of a phosphorescent probe. Biochim Biophys Acta 916:236-44

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