Distribution of MUC1, MAL2 and D52 in membrane fractions from breast cancer cell lines. (a) SK-BR-3, (b) MDA-MB-435(V) (c) MDA-MB-435(M) (d) MDA-MB-453(V) and (e) MDA-MB-453(M) cells were extracted with 1% Triton X-100 at 4°C, and subjected to centrifugation to equilibrium in sucrose density gradients. Twelve 1 ml fractions (Fr, shown above each top panel) were collected from the top of the gradient and 15 μl aliquots from each were subjected to SDS-PAGE and Western blot analysis with antibodies against MUC1, MAL2 and D52, as indicated to the left of each panel. SK-BR-3 fractions (a) were also immunoblotted with CAV1 antibody. In all panels, vertical lines between fractions 8 and 9 distinguish samples loaded on different gels. Sizes of detected proteins are indicated at the right. Results shown represent those obtained from 2–3 independent experiments.
Fanayan et al. BMC Cell Biology 2009 10:7 doi:10.1186/1471-2121-10-7