Applications of magnetic resonance techniques in the medical sciences have recently proliferated. I propose to undertake, during Phase I, detailed spectroscopic studies of uteroferrin, one of a newly recognized class of proteins with binuclear iron centers, the purple acid phosphatases. Evans magnetic susceptibility measurements will be performed to reconcile and rationalize previous findings concerning a transient phosphate- induced intermediate state of uteroferrin in which the protein exhibits characteristics of both its oxidized, diamagnetic and reduced, paramagnetic forms. Spectroscopic studies will also be performed to obtain information about the ligand structure and charge distribution of uteroferrin's binuclear iron center. The goal is to progress toward a thorough understanding of the chemistry and biological significance of uteroferrin, while acquiring facility with the techniques of magnetic resonance spectroscopy. During Phase II, I will turn to studies of intracellular iron metabolism of relevance to iron associated derangements in the liver, as well as the erythropoietic and immune systems. The experimental system to be studied will be the Kupffer cell of the liver. The hypothesis to be tested is that iron toxicity contributes to the diminished Kupffer cell viability observed after unrestrained erythrophagocytosis by these cells.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Physician Scientist Award (K11)
Project #
5K11DK001841-05
Application #
3086425
Study Section
Diabetes, Endocrinology and Metabolic Diseases B Subcommittee (DDK)
Project Start
1988-07-01
Project End
1993-06-30
Budget Start
1992-07-01
Budget End
1993-06-30
Support Year
5
Fiscal Year
1992
Total Cost
Indirect Cost
Name
Johns Hopkins University
Department
Type
Schools of Medicine
DUNS #
045911138
City
Baltimore
State
MD
Country
United States
Zip Code
21218
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Rottman, G A; Zhang, C G (1992) Precision of mean transit time measurements in 99Tcm-DTPA renal scintigraphy: a Monte Carlo study. Phys Med Biol 37:1847-58
Hanna, P M; Chasteen, N D; Rottman, G A et al. (1991) Iron binding to horse spleen apoferritin: a vanadyl ENDOR spin probe study. Biochemistry 30:9210-6