TY - JOUR
T1 - Hemoglobin tetramers stabilized with polyaspirins
AU - Buccl, Enrico
AU - Fronticelli, Clara
AU - Razynska, Anna
AU - Militello, Valeria
AU - Koehler, Raymond
AU - Urbaltls, Barbara
N1 - Funding Information:
This work was supported in part by PHS NIH grants HLBI-13164 and HLBI-33629 (E.B. and C.F.), NINS 20020 (R.K.), and Polish Scientific Research Council (KBN).
PY - 1992/1
Y1 - 1992/1
N2 - Organic acids activated by esterification with 3,5-dibromosalicylate react preferentially either with the 682 lysines or the a99 lysines of hemoglobin. The versatility and site specificity of these polysapirins and the usage of both human and bovine hemoglobins allowed the construction of a family of oxygen carriers with various P5O ranging from 10 to 50 mmHg. These derivatives are obtained in pure homogeneous form by column chromatography. They are stabilized tetramers where the dissociation into dimers is inhibited. The latest addition is Tri-(3,5,dibromosallcyl)-benzenetricarboxylate, which crosslinks both human and bovine hemoglobin across the 0 subunits, decreasing the oxygen affinity of both proteins. The crosslinked hemoglobins have a normal Bohr effect, more expanded in the alkaline region, and are sensitive to chlorides but not to polyphosphates. Solutions of stabilized tetramers, infused into rats or cats up to 25-50X blood replacement, do not produce altered renal and cardiac function. In the cat isovolemic hemodilution increases cerebral flow in controls treated with albumin solutions, when an oxygen carier is used the cerbral flow remains normal.
AB - Organic acids activated by esterification with 3,5-dibromosalicylate react preferentially either with the 682 lysines or the a99 lysines of hemoglobin. The versatility and site specificity of these polysapirins and the usage of both human and bovine hemoglobins allowed the construction of a family of oxygen carriers with various P5O ranging from 10 to 50 mmHg. These derivatives are obtained in pure homogeneous form by column chromatography. They are stabilized tetramers where the dissociation into dimers is inhibited. The latest addition is Tri-(3,5,dibromosallcyl)-benzenetricarboxylate, which crosslinks both human and bovine hemoglobin across the 0 subunits, decreasing the oxygen affinity of both proteins. The crosslinked hemoglobins have a normal Bohr effect, more expanded in the alkaline region, and are sensitive to chlorides but not to polyphosphates. Solutions of stabilized tetramers, infused into rats or cats up to 25-50X blood replacement, do not produce altered renal and cardiac function. In the cat isovolemic hemodilution increases cerebral flow in controls treated with albumin solutions, when an oxygen carier is used the cerbral flow remains normal.
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U2 - 10.3109/10731199209119639
DO - 10.3109/10731199209119639
M3 - Article
C2 - 1391438
AN - SCOPUS:0026742834
SN - 1055-7172
VL - 20
SP - 243
EP - 252
JO - Biomaterials, Artificial Cells and Immobilization Biotechnology
JF - Biomaterials, Artificial Cells and Immobilization Biotechnology
IS - 4 --Feb
ER -