title: Effect of shear stress and a stable prostaglandin I2 analogue on adhesive interactions of colon cancer cells and endothelial cells.
abstract: In the process of cancer metastasis, adhesion between cancer cells and endothelial cells is an important early step. In the present study, the effects of shear stress and the adhesion molecules responsible for cancer cell interactions with endothelial cells were investigated in a system similar to in vivo microcirculation. The effect of prostaglandin I2 (PGI2) also was determined. Human colon cancer cell line Colo 201 and human umbilical vein endothelial cells (HUVEC) were used. After HUVEC on a glass slide were incubated with IL-1beta for 4 h, cancer cells in suspension were perfused on HUVEC at wall shear stresses of 5-40 microN/cm2. Experiments were videotaped, and the number of adherent cells were counted. Additionally, the effects of anti-sialyl Lewis a (SLea) MoAb, anti-E-selectin MoAb, and a PGI2 analogue were investigated. Expression of adhesion molecules on cancer cells and HUVEC was assessed using flow cytometry and enzyme immunoassay, respectively. Few cancer cells adhered to HUVEC without IL-1beta; however, many cancer cells adhered to IL-1beta-stimulated HUVEC at low shear stress (5-20 microN/cm2). Cancer cells did not migrate beneath HUVEC. The increased adhesion was inhibited by anti-E-selectin MoAb, anti-SLea MoAb, and a PGI2 analogue. In addition, the PGI2 analogue decreased the surface expression of SLea on Colo 201 cells. These results suggest that Colo 201 cells adhere to IL-1beta-stimulated endothelial cells via SLea and E-selectin under low flow conditions; PGI2 analogues may protect against metastasis by inhibiting cancer cell-endothelial cell interactions.
authors.affiliation: First Department of Internal Medicine, Kyoto Prefectural University of Medicine, Kamigyo-ku, Kyoto, Japan. nyoshida@koto.kpu-m.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Yoshida
authors.forename: T
authors.initials: T
authors.lastname: Yoshikawa
authors.forename: S
authors.initials: S
authors.lastname: Nakagawa
authors.forename: K
authors.initials: K
authors.lastname: Sakamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Y
authors.initials: Y
authors.lastname: Naito
authors.forename: M
authors.initials: M
authors.lastname: Kondo
mesh_terms: D000328:Adult; D018395:CA-19-9 Antigen; D002448:Cell Adhesion / Q000187:drug effects; D002478:Cells, Cultured; D003110:Colonic Neoplasms; D019040:E-Selectin / Q000378:metabolism*; D004730:Endothelium, Vascular / Q000166:cytology; D011464:Epoprostenol / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D005732:Gangliosides / Q000378:metabolism*; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology; D010812:Physical Stimulation; D014407:Tumor Cells, Cultured
chemical_list: D018395:CA-19-9 Antigen; D019040:E-Selectin; D005732:Gangliosides; D007375:Interleukin-1; C048081:beraprost; C064564:sialyl Le(a) ganglioside; D011464:Epoprostenol