Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2827792 | Blood Cells, Molecules, and Diseases | 2008 | 5 Pages |
Abstract
We studied 82 Portuguese individuals, 57 with hereditary spherocytosis (HS) and 25 unaffected controls. We performed standardized diagnosis tests, including electrophoretic membrane protein analysis to identify and quantify protein deficiencies underlying HS. Membrane bound hemoglobin (MBH) and band 3 profiles were determined as oxidative stress and aging markers. A protein of about 22Â kDa, present in 21 of 57 HS patients, but not in controls, was identified as peroxiredoxin 2 (Prx2), by mass-spectroscopy and by immunoblotting. Human erythrocyte Prx2 is a peroxiredoxin with thiol-specific antioxidant activity. The presence of Prx2 in erythrocyte membranes was linked to higher levels of oxidative stress, as reflected by significantly increased MBH in those HS patients. No relation with HS clinical severity was observed and Prx2 was detected in all types of membrane protein abnormalities. Prx2 membrane linkage is associated with a higher oxidative stress susceptibility of HS erythrocytes.
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Authors
Susana Rocha, Rui M.P. Vitorino, Francisco M. Lemos-Amado, Elisabeth Bayer Castro, Petronila Rocha-Pereira, José Barbot, Esmeralda Cleto, Fátima Ferreira, Alexandre Quintanilha, LuÃs Belo, Alice Santos-Silva,