Relationship of Cell-Cycle Expression of Ia-like Antigenic Determinants on Normal and Leukemia Human Granulocyte-Macrophage Progenitor Cells to Regulation In Vitro by Acidic Isoferritins
Open Access
- 1 March 1982
- journal article
- research article
- Published by American Society for Clinical Investigation in JCI Insight
- Vol. 69 (3), 632-642
- https://doi.org/10.1172/jci110490
Abstract
An association has been established between human Ia-like (Ia) antigenic determinants, expression during DNA synthesis on granulocyte-macrophage colony forming cells (CFU-GM) and the regulatory action of acidic isoferritins in vitro. Treatment of human bone marrow cells with monoclonal-anti-Ia-like (Ia) plus complement inhibited colony and cluster formation by ∼50% but did not affect pre-CFU-GM. Reduction of colonies and clusters was similar whether bone marrow cells were exposed to anti-Ia plus complement, high specific activity tritiated thymidine (3HTdr) or acidic isoferritins. No further decrease was apparent with 3HTdr or acidic isoferritins after Ia-antigen+ CFU-GM were removed, or with anti-Ia plus complement or acidic isoferritins after DNA synthetic phase (S-phase) CFU-GM were removed. Anti-Ia, without complement, did not reduce colony or cluster formation but did block the inhibitory action of acidic isoferritins. A relationship existed between Ia antigens and the activity of acidic isoferritins in the following ways: (a) The apparent loss of Ia-antigens from CFU-GM by 5 h in culture at 37°C, but not at 27° or 4°C, was associated with nonresponsiveness to inhibition with acidic isoferritins, (b) Ia-antigen−, noncycling pre-CFU-GM that were insensitive to acidic isoferritins could generate a population of Ia-antigen+ cycling CFU-GM in vitro that were responsive to inhibition by acidic isoferritins, and (c) nondetectability of Ia-antigens on CFU-GM from patients with leukemia was associated with nonresponsiveness to inhibition by acidic isoferritins. These results implicate Ia-antigen+ progenitor cells in the regulation of myelopoiesis in vitro and demonstrate that absence of Ia-antigens on patient CFU-GM is associated with imbalances in normal regulatory interactions in vitro. These findings may be of relevance to normal regulation and to the progression of leukemia.This publication has 29 references indexed in Scilit:
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