[Erythropoiesis and functional characteristics in bone marrow erythroblastic islets during stimulated adn inhibited erythropoiesis].

When erythropiesis is stimulated (acute blood loss) or inhibited (posttransfusion polycythemia), there are early changes in the cytochemical values of erythroblastic islets (EI): in the levels of acid and neutral glucoconjugates and in the activity of nonspecific esterase. A close correlation has been found between the erythropoiesis in EI and its functional characteristics. It is concluded that central macrophages play the key role in the modulation of EI erythropoiesis. It is suggested that EI macrophages are involved in the provision of bioenergetic and reparative processes in EI.