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• W2058420070 abstract "1. Ultrastructural observations on maturing rabbit embryo erythroid cells led to the finding of hemoglobinized organelles distinguishable from mitochondria due to their highly dense matrix, two or three longitudinally arranged double lamellae, and smaller diameters. Intraorganellar 50-60 A particles identical to those contained in the hemoglobinized cytoplasm were found. 2. Their hemoglobin (Hb) content was demonstrated by electrophoresis of the concentrated supernatant from the isolated, washed, and osmotically lysed organellar fraction. We have proposed that these organelles are the sites for heme integration into the globin (G) polypeptide chains and subunits assembly. The term hemosome has been suggested for such entities. 3. This hypothesis has been sustained by several analytical and experimental works based on the postulation that hemosomes should be found at higher frequencies where the Hb biosynthesis rate is more intensive, or where the induction of this biosynthesis is always dependent on the formation of hemosomes. 4. Maturing erythroid cells of the circulating embryo blood contain hemosomes in higher frequency than in liver erythroid cells, coinciding with the higher Hb biosynthesis rate in peripheral blood than in the liver. In bleeding anemia, the decay of Hb concentration parallels the reduction of the mean number of hemosomes per reticulocyte, in comparison with normal reticulocytes. 5. In HeLa cells and epithelial cultured cells induced to synthesize Hb, it was shown that this biosynthesis is ever concomitant with the formation of hemosomes and depends on the presence of erythropoietin, as occurs in erythroid cells. 6. Studies on hemosomegenesis and Hb biosynthesis experimentally effected in epithelial cultured cells, allowed the interpretation of the sequence of events leading to hemosome formation in maturing erythroid cells. Simultaneously with iron uptake, mitochondria differentiate to lamellated bodies and, successively, expansions rise for ferruginous compounds and G polypeptides gathering, followed by prehemosome vesicles formation, which condense and change to prohemosomes that afterwards evolve to hemosomes. 7. These dynamics, and organellar Hb have been detected in immature erythrocytes of mammalians, including humans, avians, reptilians, amphibians and representative fish specimens. It appears that these events occur in the erythrocytary maturation of all vertebrate classes." @default.
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• W2058420070 date "1992-08-01" @default.
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• W2058420070 title "Hemosomegenesis and hemoglobin biosynthesis in vertebrates" @default.
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• W2058420070 doi "https://doi.org/10.1016/0300-9629(92)90718-6" @default.
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