title: Establishment and characterization of transplantable tumor line (KB) and cell lines (KB-P and KB-D8) from a rat thymus-derived dendritic cell sarcoma.
abstract: A transplantable tumor line (KB) was established in syngeneic rats from a naturally occurring sarcoma that had arisen in the thymus of a 24-month-old male F344 rat. Further, a cell line (KB-P) was induced from KB and a cloned cell line (KB-D8) was isolated from KB-P. The primary thymic tumor and KB tumors showed heterogeneous histological growth patterns such as sheet-like, ill-defined bundle, fascicular and interwoven fashions, consisting of spindle cells, oval cells and histiocytic large round cells. Immunohistochemically, neoplastic cells in KB tumors and KB-P and KB-D8 cultures reacted to vimentin and were labeled with antibodies of OX6 (for rat major histocompatibility complex class-II antigens), ED5 (for rat follicular dendritic cells; FDCs) and RED-1 (for interdigitating dendritic cells) in varying degrees, indicating that neoplastic cells exhibited the immunophenotypes of rat dendritic cells. In addition, neoplastic cells were immunoreactive to ED1 (for rat monocytes/macrophages) and ED2 (for rat tissue macrophages), and also showed positive reactions to histiocytic lysosomal enzymes such as acid phosphatase and non-specific esterase. Ultrastructurally, neoplastic cells had cell surface projections, cisterna-like structures and variously developed lysosomes in the cytoplasm. Based on these findings, the present tumor was regarded as dendritic cell-derived sarcoma capable of expressing macrophage-like and histiocytic nature. A reverse-transcription polymerase chain reaction method revealed that the addition of lipopolysaccharide dose dependently increased the expression of mRNA of transforming growth factor-beta1, a proinflammatory factor, in KB-D8 cells. The transplantable line (KB) and cell lines (KB-P and KB-D8) may become useful tools for studying the histogenesis and pathobiological functions of dendritic cells.
authors.affiliation: Department of Veterinary Pathology, Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University, Gakuencho 1-1, Sakai, Osaka 599-8531, Japan. yamate@vet.osakafu-u.ac.jp
authors.forename: Jyoji
authors.initials: J
authors.lastname: Yamate
authors.forename: Tomoko
authors.initials: T
authors.lastname: Kuriyama
authors.forename: Maki
authors.initials: M
authors.lastname: Kawashima
authors.forename: Masako
authors.initials: M
authors.lastname: Nakanishi
authors.forename: Mika
authors.initials: M
authors.lastname: Ide
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Kuwamura
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Tsukamoto
authors.forename: Takao
authors.initials: T
authors.lastname: Kotani
authors.forename: Shunji
authors.initials: S
authors.lastname: Nakatsuji
mesh_terms: D000818:Animals; D003713:Dendritic Cells / Q000473:pathology* / Q000648:ultrastructure; D000949:Histocompatibility Antigens Class II / Q000378:metabolism; D016130:Immunophenotyping; D008297:Male; D009368:Neoplasm Transplantation; D051381:Rats; D011916:Rats, Inbred F344; D012509:Sarcoma / Q000378:metabolism / Q000473:pathology*; D013953:Thymus Neoplasms / Q000378:metabolism / Q000473:pathology*; D016212:Transforming Growth Factor beta / Q000096:biosynthesis; D014407:Tumor Cells, Cultured; D014746:Vimentin / Q000378:metabolism
chemical_list: D000949:Histocompatibility Antigens Class II; D016212:Transforming Growth Factor beta; D014746:Vimentin