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. 1987 Jan;84(1):223–227. doi: 10.1073/pnas.84.1.223

Drastically increased expression of MYC and FOS protooncogenes during in vitro differentiation of chronic lymphocytic leukemia cells.

L G Larsson, H E Gray, T Tötterman, U Pettersson, K Nilsson
PMCID: PMC304175  PMID: 3099293

Abstract

Chronic lymphocytic leukemia cells, representing a clonal population of resting B lymphocytes, were induced to differentiate into immunoglobulin-secreting lymphoblasts and plasmablasts by phorbol 12-myristate 13-acetate. The induction resulted in a rapid increase in the molar ratio of secreted/membrane-bound mu-chain mRNA. Immunoglobulin secretion was preceded by a transition of the cells from the G0 to G1 phase of the cell cycle, as indicated by an increase in RNA and protein synthesis, and an overall increase in cellular RNA. The cells, however, became blocked in G1 and did not enter S phase. The expression of MYC and FOS was rapidly induced by the phorbol 12-myristate 13-acetate treatment. The induction of FOS preceded the shift in secreted/membrane-bound mu-chain mRNA molar ratio, while that of MYC occurred concomitantly with the shift, but prior to induction of total RNA synthesis and immunoglobulin secretion. MYC expression remained at a relatively high level during the whole differentiation process. It is thus concluded that a decline of MYC expression is not a prerequisite for differentiation of the chronic lymphocytic leukemia cells. This suggests that MYC expression may play a different role during differentiation of nonproliferating B cells than in the myelomonocytic cell lines HL-60 and U-937, where MYC expression has been reported to decrease during induced differentiation. The results also show that the expression of the MYC and FOS genes does not result in the transition of these cells into the S phase of the cell cycle.

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Selected References

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