Increased release of free Fe ions in human erythrocytes during aging in the circulation.
We investigated whether free Fe ions were released in erythrocytes during aging process in the circulation. Young and senescent erythrocytes were separated from freshly drawn human blood by Percoll density gradient centrifugation. Two different methods were employed for determination of free Fe ions in erythrocytes, desferrioxamine (DFO) method and bleomycin method. DFO-chelatable Fe ions were detected in whole erythrocytes from 2 donors, and the DFO-chelatable free Fe ion levels in senescent erythrocytes were higher than those in young erythrocytes. Bleomycin-sensitive Fe ions, which was rather lower than DFO-chelatable Fe ions, were also detected in whole erythrocytes from 5 donors, and the free Fe ion levels in senescent erythrocytes were also higher than those in young erythrocytes. Free Fe ions may be derived from oxidative damage of hemoglobin, because treatment of whole erythrocytes or purified oxyhemoglobin with hydrogen peroxide gave increased free Fe ions. The results indicated that free Fe ions were released from erythrocytes during aging process in the circulation. Released free Fe ions would promote oxidative damages of the cells during aging process.
Ando
Ken
K
School of Pharmacy, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
Ogawa
Keitaro
K
Misaki
Satoko
S
Kikugawa
Kiyomi
K
D001761:Bleomycin / Q000737:chemistry; D002469:Cell Separation; D002499:Centrifugation, Density Gradient; D002851:Chromatography, High Pressure Liquid; D003676:Deferoxamine / Q000737:chemistry; D004905:Erythrocyte Aging; D004912:Erythrocytes / Q000737:chemistry*; D005296:Ferrous Compounds / Q000097:blood; D006454:Hemoglobins / Q000737:chemistry; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D007501:Iron / Q000097:blood* / Q000737:chemistry; D007502:Iron Chelating Agents / Q000737:chemistry; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D012996:Solutions; D017392:Thiobarbituric Acid Reactive Substances / Q000032:analysis
D005296:Ferrous Compounds; D006454:Hemoglobins; D007502:Iron Chelating Agents; D012996:Solutions; D017392:Thiobarbituric Acid Reactive Substances; D001761:Bleomycin; D006861:Hydrogen Peroxide; D007501:Iron; D003676:Deferoxamine