First, a 50-μl quantity of
Matrigel (100 μg/ml, BD Bioscience) was added onto an
Image Lock 96-well plate (Essen BioScience) overnight at 37°C in 5% CO
2. Then, 6 × 10
4 DCIS
alone2cy, DCIS
cnt2cy, and DCIS
CAF2cy were seeded onto the
Matrigel-precoated plates in 100 μl of DMEM/F12 with 5% FBS for 4 h at 37°C in 5% CO
2 (
Figs 2B and
5C). The scratch wound was also generated by the
Wound Maker tool (Essen BioScience), before washing with PBS once and coating with 50 μl of
Matrigel (8 mg/ml) on a prechilled cool box. To solidify the
Matrigel, the plate was subsequently incubated at 37°C in 5% CO
2 for 30 min followed by addition of 100 μl of 5% FBS in DMEM/F12 at 37°C in 5% CO
2. The plate was scanned with an
IncuCyte Zoom (Essen BioScience) according to the manufacturer’s instructions at 3-h intervals for 5 d.
Plates were incubated for 1 h and then treated with DMSO, saracatinib (1 μM), or PP1 (10 μM) (
Fig 6H). The plates were scanned with an
IncuCyte Zoom (Essen BioScience) according to the manufacturer’s instructions at 2-h intervals for 4 d.
Matsumura Y., Ito Y., Mezawa Y., Sulidan K., Daigo Y., Hiraga T., Mogushi K., Wali N., Suzuki H., Itoh T., Miyagi Y., Yokose T., Shimizu S., Takano A., Terao Y., Saeki H., Ozawa M., Abe M., Takeda S., Okumura K., Habu S., Hino O., Takeda K., Hamada M, & Orimo A. (2019). Stromal fibroblasts induce metastatic tumor cell clusters via epithelial–mesenchymal plasticity. Life Science Alliance, 2(4), e201900425.