Human and bovine hemoglobins are investigated for obtaining oxygen carriers which could be used in health care delivery procedures. Three main difficulties must be overcome: the short intravascular retention time and the high oxygen affinity of hemaglobin, in cell-free conditions and the vascular toxicity present in hemolysates. Bovine hemoglobin will be especially investigated for its hemolysates. Bovine hemoglobin will be especially investigated for its peculiar functional characteristics namely the strong sensitivity of its oxygen affinity to anions and the relative insensitivity to polyphosphates. In bovine hemoglobin there is a methionine in position beta1, which substitutes for the Val-His dipeptide in position beta1-beta2 in human hemoglobin. This may be responsible for the different functional attitudes of human and bovine hemoglobins. Reacting bovine deoxyhemoglobin with fumaryl diaspirin it is possible to obtain an oxygen carrier with P50 near 60 mmHg at pH 7.4. There is an intramolecular crosslink between the beta subunits of this compound, while the same reaction produces a crosslink between the alpha subunits in human hemoglobin. As already noticed for human hemolysates, bovine hemolysates inhibit the relaxation produced by endothelium derived relaxing factor in rings of rabbit aorta. They do not inhibit the beta receptor. Specific goals of the project are 1) To elucidate the peculiar interaction of bovine hemoglobin with mono and polyvalent anions, exploring the possible role of the methionine at beta1 in these phenomena. 2) To elucidate the structure function relationship in hemoglobins whose tetrameric structure has been stabilized by intramolecular crosslinks. 3) To prolong the retention time of hemoglobins by mild polymerization and by modifying their hydrodynamic volume. 4) To clarify the pharmacological origin of the vascular toxicity of hemoglobin solutions.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL033629-05
Application #
3345709
Study Section
Hematology Subcommittee 2 (HEM)
Project Start
1985-04-01
Project End
1992-06-30
Budget Start
1989-07-01
Budget End
1990-06-30
Support Year
5
Fiscal Year
1989
Total Cost
Indirect Cost
Name
University of Maryland Baltimore
Department
Type
Schools of Medicine
DUNS #
003255213
City
Baltimore
State
MD
Country
United States
Zip Code
21201
Fronticelli, C; Brinigar, W S; Olson, J S et al. (1993) Recombinant human hemoglobin: modification of the polarity of the beta-heme pocket by a valine67(E11)-->threonine mutation. Biochemistry 32:1235-42
Gryczynski, Z; Bucci, E; Kuyyba, J (1993) Linear dichroism study of metalloporphyrin transition moments in view of radiationless interactions with tryptophan in hemoproteins. Photochem Photobiol 58:492-8
Bucci, E; Fronticelli, C; Gryczynski, Z et al. (1993) Effect of intramolecular cross-links on the enthalpy and quaternary structure of the intermediates of oxygenation of human hemoglobin. Biochemistry 32:3519-26
Gryczynski, Z; Bucci, E (1993) A new front-face optical cell for measuring weak fluorescent emissions with time resolution in the picosecond time scale. Biophys Chem 48:31-8
Chiancone, E; Fronticelli, C; Gattoni, M et al. (1992) Immobilized hemoglobin in the purification of hemoglobin-based oxygen carriers. J Chromatogr 604:117-23
Bucci, E; Fronticelli, C; Razynska, A et al. (1992) Hemoglobin tetramers stabilized with polyaspirins. Biomater Artif Cells Immobilization Biotechnol 20:243-52
Gryczynski, Z; Tenenholz, T; Bucci, E (1992) Rates of energy transfer between tryptophans and hemes in hemoglobin, assuming that the heme is a planar oscillator. Biophys J 63:648-53
Urbaitis, B K; Razynska, A; Corteza, Q et al. (1991) Intravascular retention and renal handling of purified natural and intramolecularly cross-linked hemoglobins. J Lab Clin Med 117:115-21
Razynska, A; Fronticelli, C; Di Cera, E et al. (1990) Effect of temperature on oxygen affinity and anion binding of bovine hemoglobin. Biophys Chem 38:111-5
Bucci, E; Steiner, R F (1990) Perturbation of molecular species distribution in steady states supported by a flow of energy. Models analogous to Ca2(+)-dependent ATPase and phosphorylase b. Biophys Chem 37:61-71

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