title: Band-3 polymers and aggregates, and hemoglobin precipitates in red cell aging.
abstract: As part of our systematic ongoing studies of mechanisms of cellular and molecular aging, we developed a "biochemical profile" of senescent human red cells. This "red cell aging" panel allows us to assess functional red cell age independent of chronologic age. The panel used to obtain this profile includes IgG binding, phagocytosis, enzyme activity, anion transport, ankyrin binding, and immunoblotting with antibodies to band 3. We used this panel to compare the biochemical profile of glucose 6-phosphate dehydrogenase-deficient and hemoglobin Köln cells containing high molecular weight protein polymers or hemoglobin precipitates with that of normal senescent cells. We found no evidence in support of the concept that aggregation of band 3 plays a role in the mechanism for generating senescent cell antigen. Observations such as these support the hypothesis that degradation of band 3, rather than aggregation is a critical event in IgG binding and normal erythrocyte aging.
authors.affiliation: Department of Medical Microbiology and Immunology, College of Medicine, Texas A&M University, Temple 76504.
authors.forename: M M
authors.initials: MM
authors.lastname: Kay
authors.forename: G J
authors.initials: GJ
authors.lastname: Bosman
authors.forename: G J
authors.initials: GJ
authors.lastname: Johnson
authors.forename: A H
authors.initials: AH
authors.lastname: Beth
mesh_terms: D001457:Anion Exchange Protein 1, Erythrocyte / Q000276:immunology / Q000502:physiology*; D000838:Anions; D017487:Ankyrins; D001798:Blood Proteins / Q000378:metabolism; D002469:Cell Separation; D004578:Electron Spin Resonance Spectroscopy; D004591:Electrophoresis, Polyacrylamide Gel; D004905:Erythrocyte Aging; D005954:Glucosephosphate Dehydrogenase / Q000097:blood; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000378:metabolism; D006454:Hemoglobins / Q000502:physiology*; D015151:Immunoblotting; D007074:Immunoglobulin G / Q000378:metabolism; D008565:Membrane Proteins / Q000032:analysis / Q000378:metabolism; D010587:Phagocytosis; D011108:Polymers
chemical_list: D001457:Anion Exchange Protein 1, Erythrocyte; D000838:Anions; D017487:Ankyrins; D001798:Blood Proteins; D006454:Hemoglobins; D007074:Immunoglobulin G; D008565:Membrane Proteins; D011108:Polymers; D005954:Glucosephosphate Dehydrogenase; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases