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. 1984 Jun;81(11):3394–3398. doi: 10.1073/pnas.81.11.3394

Inducer-mediated commitment of murine erythroleukemia cells to terminal cell division: the expression of commitment.

T Murate, T Kaneda, R A Rifkind, P A Marks
PMCID: PMC345514  PMID: 6203120

Abstract

Murine erythroleukemia cells (MELC) are transformed cells that can be induced to differentiate by a variety of agents, such as hexamethylenebisacetamide (HMBA) and dimethyl sulfoxide. Dexamethasone suppresses HMBA-mediated MELC differentiation, but MELC retain a memory for their exposure to HMBA since, on transfer from culture with HMBA and dexamethasone to medium without additions, a portion of the cells express characteristics of terminal differentiation. This study characterizes the steroid suppressed steps in the multi-step process of inducer-mediated MELC terminal differentiation. MELC in culture with HMBA and dexamethasone show low levels of commitment to terminal cell division; upon transfer to culture with inducer alone there is a rapid increase in the proportion of committed cells. The magnitude of this rapid or "step-up" expression of commitment increased with the length of prior culture with inducer and steroid. This step-up expression is not inhibited by actinomycin D or cordycepin but is blocked by cycloheximide. HMBA is required for step-up expression of commitment. In the absence of inducer, there is a rapid decay in the capacity for step-up expression. Thus, HMBA initiates a series of changes leading to the accumulation of factors--which may be mRNAs--whose expression is blocked by dexamethasone. Hemin, which induces MELC accumulation of globin mRNA but not commitment to terminal cell division, cannot, as does HMBA or dimethyl sulfoxide, cause step-up expression of commitment.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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