title: Establishment and characterization of a KIT-positive and stem cell factor-producing cell line, KTHOS, derived from human osteosarcoma.
abstract: Osteosarcoma is a malignant bone tumor that commonly affects adolescents and young adults. In the present study a human osteosarcoma cell line, KTHOS, was established from a primary osteosarcoma lesion in the distal femur of a 16-year-old girl. After 106 passages, the KTHOS cell line retained the biological characteristics of osteosarcoma. The KTHOS cells had spindle to pleomorphic cytoplasm with round to ovoid nuclei containing multiple prominent nucleoli, as expected based on the mesodermic origin of osteoblasts. The KTHOS cells were immunoreactive for osteocalcin, osteonectin, stem cell factor (SCF), and KIT (CD117). Reverse transcriptase-polymerase chain reaction indicated that the KTHOS cell line expressed mRNA for SCF and KIT. The KTHOS cells produced relatively high amounts of soluble SCF as determined by enzyme-linked immunosorbent assay. The results suggest that cell proliferation of the KTHOS cell line might be involved in autocrine and/or paracrine loops of the SCF/KIT signaling system. The KTHOS cell line is a novel human osteosarcoma cell line that releases SCF and expresses KIT. This cell line can be used for studies to explore the mechanisms for oncogenesis of human osteosarcomas.
authors.affiliation: Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Hitora
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Akisue
authors.forename: Takashi
authors.initials: T
authors.lastname: Marui
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Nakatani
authors.forename: Teruya
authors.initials: T
authors.lastname: Kawamoto
authors.forename: Keiko
authors.initials: K
authors.lastname: Nagira
authors.forename: Shinichi
authors.initials: S
authors.lastname: Yoshiya
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kurosaka
mesh_terms: D000293:Adolescent; D000818:Animals; D001859:Bone Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D045744:Cell Line, Tumor / Q000378:metabolism; D049109:Cell Proliferation; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D010006:Osteoblasts / Q000378:metabolism / Q000473:pathology; D015675:Osteocalcin / Q000378:metabolism; D053495:Osteopontin; D012516:Osteosarcoma / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D019009:Proto-Oncogene Proteins c-kit / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D012334:RNA, Neoplasm / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012795:Sialoglycoproteins / Q000378:metabolism; D019089:Stem Cell Factor / Q000235:genetics / Q000378:metabolism*
chemical_list: D012333:RNA, Messenger; D012334:RNA, Neoplasm; C506895:SPP1 protein, human; D012795:Sialoglycoproteins; C506896:Spp1 protein, mouse; D019089:Stem Cell Factor; D015675:Osteocalcin; D053495:Osteopontin; D019009:Proto-Oncogene Proteins c-kit