title: Quantification of loss of haemoglobin components from the circulating red blood cell in vivo.
abstract: Previous studies have shown that a considerable amount of haemoglobin is lost from the intact red cell during its lifespan. The aim of this study was to determine the relative contribution of all the haemoglobin components to this process. Therefore, the relative amount of haemoglobins A0, A2, F and the glycated haemoglobins were determined in 24 fractions of different cell age. These fractions were obtained by the combination of counterflow and density centrifugation. When the absolute amount of all haemoglobin components were calculated using the MCH-values of each fraction, it appeared that the mean red cell loss of haemoglobins A0, A2, F, an unknown X and "rest" comprised, respectively, 440, 23, 1, 4 and 1 amol per cell, while the mean gain of the glycated haemoglobins was 84 amol per cell. This resulted in a net loss of 385 amol of haemoglobin per cell. One of the glycated haemoglobins (HbA1e2) turned out to be the product of further carbamylation. It was concluded that in the first half of the red cell lifespan HbA0 and HbA2 decreased by glycation and carbamylation and that in the second half some of the HbA0 and HbA2 but also some of the glycated and carbamylated haemoglobin components leave the red cell. The total loss amounted to about 20%.
authors.affiliation: Laboratory of Clinical Chemistry, Rijnstata Hospital, Arnhem, The Netherlands.
authors.forename: F L
authors.initials: FL
authors.lastname: Willekens
authors.forename: F H
authors.initials: FH
authors.lastname: Bosch
authors.forename: B
authors.initials: B
authors.lastname: Roerdinkholder-Stoelwinder
authors.forename: Y A
authors.initials: YA
authors.lastname: Groenen-Döpp
authors.forename: J M
authors.initials: JM
authors.lastname: Werre
mesh_terms: D002469:Cell Separation; D002851:Chromatography, High Pressure Liquid; D004905:Erythrocyte Aging; D004912:Erythrocytes / Q000737:chemistry* / Q000166:cytology; D005319:Fetal Hemoglobin / Q000032:analysis; D006442:Glycated Hemoglobin / Q000032:analysis; D006441:Hemoglobin A / Q000032:analysis; D006443:Hemoglobin A2 / Q000032:analysis; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D012016:Reference Values
chemical_list: D005319:Fetal Hemoglobin; D006442:Glycated Hemoglobin; D006441:Hemoglobin A; D006443:Hemoglobin A2; D006454:Hemoglobins; C028881:hemoglobin A(0)