TY - JOUR AB - Supplementation with exogenous growth factors such as fibroblast growth factors (FGFs) is essential for anchorage-independent growth of the SW-13 human adrenal adenocarcinoma cell line. We have found that SW-13 cells express mRNAs for FGFRs 1, 3, and 4, but not FGFR2. To assess the roles of individual FGFRs, in anchorage-independent growth, we determined the effects of down-regulation of each FGFR on FGF2- and FGF4-mediated soft agar colony formation in these cells. Using RNAi strategies we found that knockdown of either FGFR1 or FGFR3 leads to inhibition of FGF2- or FGF4-induced soft agar clonogenicity without affecting that induced by heregulin β1. However, this inhibition is independent of ERK1/2 activation as levels of FGF-induced phospho-ERK 1/2 remain unchanged upon knockdown of either FGFR1 or FGFR3. Conversely, RNAi-mediated knockdown of FGFR4 appeared to have no significant effect on either FGF2- or FGF4-induced anchorage-independent colony formation, or ERK1/2 phosphorylation. These results suggest that constitutive levels of both FGFR1 and FGFR3, but not FGFR4 are essential for FGF-stimulated anchorage-independent growth of SW-13 cells. AD - Biochemistry and Molecular Biology Department, Drug Discovery Division, Southern Research Institute, 2000 Ninth Avenue South, Birmingham, AL 35255, USA null AU - Estes II,Norman,R. AU - Thottassery,Jaideep,V. AU - Kern,Francis,G. DA - 2006/06/01 DO - 10.3892/or.15.6.1407 EP - 1416 IS - 6 JO - Oncol Rep PY - 2006 SN - 1021-335X 1791-2431 SP - 1407 ST - siRNA mediated knockdown of fibroblast growth factor receptors 1 or 3 inhibits FGF-induced anchorage-independent clonogenicity but does not affect MAPK activation T2 - Oncology Reports TI - siRNA mediated knockdown of fibroblast growth factor receptors 1 or 3 inhibits FGF-induced anchorage-independent clonogenicity but does not affect MAPK activation UR - https://doi.org/10.3892/or.15.6.1407 VL - 15 ER -