Figure 3. MYC reduction potentiates TGFβ-induced upregulation of integrin αvβ3 and an invasive cellular phenotype.
(A–B) TGFβ treatment and MYC knockdown of MCF10A cells stimulate integrin αvβ3 through a potentiation effect that is dependent upon expression of integrin αvβ3, assessed by protein expression (A) and cell invasion (B). (C–E) MCF10A cells continuously exposed to TGFβ or exposed for a short period of time and then cultured in the absence of exogenous TGFβ showed persistent expression of MYC, integrin αv and integrin β3 (C) and TGFβ-responsive reporter construct (D) through consistent activation of TGFβ expression (E). Transcriptional results are presented as relative quantification, normalized to GAPDH. Error bars, SEM; * p<0.5; ** p<0.01; *** p<0.001.