Characterization of red cell membrane proteins as a function of red cell density: annexin VII in different forms of hereditary spherocytosis |
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Authors: | Caterino Marianna Ruoppolo Margherita Orrù Stefania Savoia Marcella Perrotta Silverio Del Vecchio Luigi Salvatore Francesco Stewart Gordon W Iolascon Achille |
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Institution: | Dipartimento di Biochimica e Biotecnologie Mediche, Università di Napoli "Federico II", Via Pansini, 5 80131 Napoli, Italy. |
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Abstract: | Fresh human blood samples were collected from healthy controls and splenectomized and unsplenectomized patients with hereditary spherocytosis due to band 3 or ankyrin and spectrin deficiency. The erythrocytes were separated into age-related fractions using self-forming Percoll density gradients. Membrane proteins were analysed by 2D electrophoresis and identified by mass spectrometry. Annexin VII was present in reticulocytes but was then lost as the cells matured. A different pattern was found in band 3-deficient samples: annexin VII was in fact present in both mature and immature red cell membranes. Cytoskeletal anomalies may then influence the turn-over of annexin VII during erythrocyte maturation. |
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