Fig. 2.

Extracellular signal-related (Erk)/mitogen-activated protein kinase (MAPK) activation is required for protein tyrosine kinase C theta isoform (PRKCQ)-mediated epidermal growth factor (EGF)-independent growth. a MCF-10A cells overexpressing pBabe vector control or wild-type PRKCQ were cultured in growth media lacking EGF. Lysates were probed with the indicated antibodies. b PRKCQ or vector control expressing MCF-10A cells were cultured in growth media +/- EGF. Cells grown in the absence of EGF were treated for 24 hours with dimethyl sulfoxide (DMSO) or mitogen-activated protein kinase kinase (MEK) inhibitor U0126 (5 μM). Cells were lysed and probed with the indicated antibodies. c MCF-10A cells expressing vector control or PRKCQ were cultured in growth media lacking EGF and treated with DMSO or U0126 (5 μM) for the indicated number of days. DMSO or U0126 was replaced every 2–3 days. Cell numbers were counted on the indicated days and plotted. Rb retinoblastoma