title: Laminin 5 beta3 and gamma2 chains are frequently coexpressed in cancer cells.
abstract: Laminin 5 plays an important role in cell migration during tumor invasion and tissue remodeling. However, previous studies have not clarified whether laminin 5 beta3 chain is coexpressed with laminin 5 gamma 2 chain in cancer cells. The present immunohistochemical study investigated the distribution of the laminin 5 beta3 and gamma2 chains in 20 cases of squamous cell carcinoma of the tongue and 17 cases of colorectal carcinoma. Laminin 5 beta3 and gamma2 chains were expressed in the cytoplasm of tumor cells. Tumor cells at the cancer-stromal interface and at the invasive front frequently showed immunopositivity for laminin 5 beta3 and gamma2 chains in both squamous cell carcinoma of the tongue and colorectal carcinoma. Furthermore, strong expressions of these two proteins were observed in cancer cells invading in a scattered manner. Laminin 5 beta3 expression correlated significantly with laminin 5 gamma2 expression in 20 cases of squamous cell carcinoma of the tongue (P = 0.0002) and 17 cases of colorectal carcinoma (P < 0.0001). These results suggest that in squamous cell carcinoma of the tongue and colorectal carcinoma, laminin 5 gamma2 chain and beta3 chain are both important in the invasiveness of cancer cells.
authors.affiliation: Pathology Division, National Cancer Center Research Institute, Tokyo, Japan.
authors.forename: Shingo
authors.initials: S
authors.lastname: Akimoto
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Nakanishi
authors.forename: Michiie
authors.initials: M
authors.lastname: Sakamoto
authors.forename: Yae
authors.initials: Y
authors.lastname: Kanai
authors.forename: Setsuo
authors.initials: S
authors.lastname: Hirohashi
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism* / Q000473:pathology / Q000601:surgery; D014408:Biomarkers, Tumor / Q000378:metabolism; D015153:Blotting, Western; D002294:Carcinoma, Squamous Cell / Q000378:metabolism* / Q000473:pathology / Q000601:surgery; D015815:Cell Adhesion Molecules / Q000378:metabolism*; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000601:surgery; D006801:Humans; D007150:Immunohistochemistry; D007797:Laminin / Q000378:metabolism*; D009361:Neoplasm Invasiveness; D014062:Tongue Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000601:surgery; D000097794:Kalinin
chemical_list: D014408:Biomarkers, Tumor; D015815:Cell Adhesion Molecules; D007797:Laminin; D000097794:Kalinin; C400567:LAMC2 protein, human