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Regeneration of erythroid progenitor cells in polycythemic mice treated with cyclophosphamide. | LitMetric

AI Article Synopsis

Article Abstract

Mice with posthypoxic polycythemia treated with a sublethal dose of cyclophosphamide (Cy) were used as a model to investigate, by in vitro methods, the kinetics of regeneration of erythroid committed precursors (ECP) and to study the influence of erythropoietin (Ep) on those precursor cells. The results demonstrated that erythroid burst-forming units (BFU-E), early (d10) and late (d4), and erythroid colony-forming units (CFU-E) recover at different rates after Cy. Early BFU-E recovery was not Ep dependent and closely resembled regeneration of pre-erythropoietin-responsive cells (pre-ERC) found previously using the same experimental model. The absence of spontaneous recovery of mature BFU-E and CFU-E in the bone marrow and spleen of Cy-treated polycythemic mice, which is contrary to the findings in normal mice treated with Cy, indicates the importance of Ep for BFU-E (d4) and CFU-E regeneration. This was confirmed when exogenous Ep was injected. The effect on BFU-E (d4) of exogenous Ep injected into the polycythemic Cy-treated mice at the time when primitive BFU-E have regenerated considerably suggested an influence of Ep on the transition of BFU-E (d10) to BFU-E (d4). The fast regeneration of CFU-E in the spleen of normal mice and after Ep injection in polycythemic Cy-treated mice confirms the well-known and significant role of the spleen in mouse erythropoiesis under stress conditions. It could be suggested that the patterns of BFU-E (d4) and CFU-E recovery as well as Ep responsiveness closely resemble the findings observed earlier for ERC in the same experimental model.

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