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DECHANT, Anne K; DEE, Keith; WEYMAN, Crystal M
Oncogene, 08/2002, Letnik: 21, Številka: 34Journal Article
We examined the effect of a constitutively active Raf protein (Raf-CAAX) on the differentiation and the coincident apoptosis of skeletal myoblasts. We found that a low level of Raf signaling leads to accelerated differentiation when compared to parental myoblasts, while a higher level of Raf signaling induces a transformed morphology and abrogates both differentiation and the coincident apoptosis. Raf signaling abrogates apoptosis without blocking the activation of caspase 3 and the subsequent cleavage of caspase 3 substrates. Eliminating the signal from Raf through MEK does not restore the ability to differentiate or to undergo apoptosis in the myoblasts with a high level of Raf signal, nor does it abrogate the accelerated differentiation observed in myoblasts with lower levels of Raf signal. Constitutive signaling through MEK is required, however, to maintain a transformed morphology. These results indicate that the effect of Raf on the differentiation and apoptosis of skeletal myoblasts is dictated by the level of Raf signaling, and that Raf signaling sufficient to abrogate the apoptosis coincident with differentiation does so downstream of caspase 3 signaling.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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