title: Galectin-9 as a regulator of cellular adhesion in human oral squamous cell carcinoma cell lines.
abstract: Oral squamous cell carcinomas (OSCCs), a major public health problem worldwide, are the most common neoplasms of the head and neck. The most important prognostic indicator for patients with OSCC is metastasis to cervical lymph nodes or distant organs. Galectin-9 is correlated with cellular adhesion and aggregation in melanoma cells. To investigate expression levels of galectin-9 mRNA and protein, we performed qRT-PCR and Western blot analyses on OSCC cell lines (Ca9-22, HSC-2, and HSC-3) and normal oral keratinocytes (NOKs). Galectin-9 mRNA and protein were commonly down-regulated in OSCC cell lines compared with NOKs. We further analyzed Ca9-22, which had the lowest expression of galectin-9. We then transfected the galectin-9 cDNA into Ca9-22 cells to examine whether overexpression of galectin-9 increases cellular adhesion in vitro. An adhesion assay using a fibronectin and collagen I coating plate revealed an increased cellular adherence ratio in overexpressed galectin-9 cells compared with nontransfected cells (p < 0.05). The data suggest that galectin-9 is correlated with oral cancer cell-matrix interactions and may therefore play an important role in the metastasis of OSCCs.
authors: Department of Clinical Molecular Biology, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan.
authors: Atsushi
authors: A
authors: Kasamatsu
authors: Katsuhiro
authors: K
authors: Uzawa
authors: Dai
authors: D
authors: Nakashima
authors: Hirofumi
authors: H
authors: Koike
authors: Masashi
authors: M
authors: Shiiba
authors: Hiroki
authors: H
authors: Bukawa
authors: Hidetaka
authors: H
authors: Yokoe
authors: Hideki
authors: H
authors: Tanzawa
mesh_terms: D015153:Blotting, Western; D002294:Carcinoma, Squamous Cell / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D002448:Cell Adhesion / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D045744:Cell Line, Tumor; D002478:Cells, Cultured; D024042:Collagen Type I / Q000378:metabolism / Q000494:pharmacology; D005353:Fibronectins / Q000378:metabolism / Q000494:pharmacology; D037161:Galectins / Q000235:genetics* / Q000378:metabolism; D015870:Gene Expression; D006801:Humans; D015603:Keratinocytes / Q000166:cytology / Q000378:metabolism; D009062:Mouth Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D014162:Transfection
chemical_list: D024042:Collagen Type I; D005353:Fibronectins; D037161:Galectins; C105032:LGALS9 protein, human; D012333:RNA, Messenger