A, Western blot analysis of PDGFRa expression in uterine and ovarian cancer cell lines. B, In vitro effect of 3G3 on PDGFRa, pPDGFRa, and its downstream targets. Cells (Hec-1A) were treated with 3G3 or nonspecific human immunoglobulin G (HmIgG) for 24 hours and then stimulated with 1 nM PDGF-AA for 10 minutes. Cell lysates were analyzed by Western blot analysis with antibodies against PDGFRa, pPDGFRa, p 44/42 MAPK, MAPK, pAKT, and AKT. C, Western blot analysis of expression of PDGFRa downstream targets in RL95-2 cells. RL95-2 cells were treated with 3G3 or PDGF-AA as mentioned above. Loading of an equal amount of sample per gel lane was confirmed by b-actin expression.