Figure 6From: Invasive breast cancer induces laminin-332 upregulation and integrin β4 neoexpression in myofibroblasts to confer an anoikis-resistant phenotype during tissue remodelingIntegrin β4 neoexpression suppresses fibroblast aggregation under anoikis conditions. Formation of fibroblast aggregates under anoikis conditions in (A) the absence or (B) the presence of integrin β4. Fibroblasts (5 × 105) were plated with RSM, MCF7 CM, or MDA-MB-231 CM on poly-HEMA-coated six-well plates and incubated for 24 hours. The formation of cell aggregates was observed with phase microscopy. (C) The scattering of integrin β4-expressing fibroblasts under anoikis conditions was not affected by blocking the laminin-332/integrin interaction. Fibroblasts (2.5 × 104) were plated with RSM, MCF7 CM, or MDA-MB-231 CM on poly-HEMA-coated 96-well plates with blocking antibodies against integrin β1 or β4 (diluted 1:100 with RSM) or MDA-MB-231 CM for 24 hours. (D) Decreased expression of β-catenin may cause reduced fibroblast aggregation. Suspended cells were collected, lysed, and subjected to Western blot analysis of β-catenin expression.Back to article page