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1992 ; 83
(1
): 61-5
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c-Myc interferes with the commitment to differentiation of murine erythroleukemia
cells at a reversible point
#MMPMID1544874
Takada S
; Yamamoto T
; Ohmori Y
; Matsui Y
; Obinata M
Jpn J Cancer Res
1992[Jan]; 83
(1
): 61-5
PMID1544874
show ga
When murine erythroleukemia (MEL) cells, containing the transferred rat c-myc
gene under the control of human metallothionein II gene promoter, are induced to
differentiate with dimethyl sulfoxide, the level of differentiation is dependent
on the c-Myc level, which is modulated by the addition of Zn ions. In this work,
we examined the point of inhibition of differentiation by elevated levels of
c-Myc in one (clone 38-2) of the typical transformants. Commitment assay
indicated that elevated levels of c-Myc interfere with entry of the transformant
into the commitment event, but when c-myc expression was reduced by removing Zn
ions from the medium, the cells could reenter the commitment program. However,
once the cells were committed, such cells could not return to the uncommitted
state. In addition, time-dependent expression of two erythroid specific genes was
inhibited by elevated levels of c-Myc in time-dependent manner. These results
suggest that c-Myc modulates MEL cell differentiation at a reversible point of
commitment.