Fig. 5. Integrin-mediated adhesion requires intact lipid rafts. (A) Adhesion of Jurkat T cells to immobilised fibronectin using 4ß1 and 5ß1. (B) Adhesion of cultured human T cells to ICAM-1 using LFA-1. Prior to adhesion, the T cells were incubated with no drug (Control), 10 mM MßCD (MbCD), 5 mM MßCD plus 5 mM MßCD-cholesterol (MbCD+Chol), or 10 mM MßCD, followed by washing and incubation with MßCD-cholesterol inclusion complexes (Cholesterol). For the adhesion reaction, cells were incubated with no agonist (Unstim), 100 nM PdBu, 0.5 mM Mn²⁺ or with the ß2-integrin-activating mAb KIM 185 at 10 µg/ml. Data are representative of four experiments (A) and three experiments (B).