title: Persistent roles of signal transduction of platelet-derived growth factor B in genesis, growth, and anaplastic transformation of gliomas in an in-vivo serial transplantation model.
abstract: We previously reported that retrovirally transduced platelet-derived growth factor-B (PDGFB) in glial progenitors of the rat cerebral white matter, subventricular zone, or brain stem induced malignant brain tumors closely resembling human glioblastoma (GBM). While human GBMs may progress over the period of several months to a few years, prospective, long-term in-vivo observation of histological changes of the tumor tissues is not feasible in these models, because the animals undergo rapid tumor progression and mortality within approximately 1 month. We thus performed successive, long-term in-vivo transplantation of the PDGFB-induced tumor cells into the rat cerebrum. Primary retroviral transduction of PDGFB in the glial progenitors of the rat basal ganglia induced malignant glioma resembling human GBM or anaplastic oligodendroglioma (AOL) consisting of relatively monomorphous tumor cells expressing markers for the oligodendrocyte lineage. In the course of long-term successive transplantation, tumor cells presented pleomorphism as well as focal GFAP expression. This suggests that secondary chromosomal aberration and dysregulation of gene expression following accelerated cell cycle by PDGFB stimulation would induce morphological and immunophenotypic changes in tumor cells. Furthermore, while the primary tumors contained only a minor fraction of proviral GFP-expressing or hemagglutinin-expressing cells, most tumor cells came to express these proviral genes in the course of serial transplantation suggesting a persistent role of PDGFB-expressing cells in maintenance and growth of the tumors. This model would be useful for investigation of the long-term effects of PDGFB stimulation in glioma tissues on anaplastic evolution.
authors.affiliation: Department of Neuropathology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
authors.forename: Rina
authors.initials: R
authors.lastname: Torisu
authors.forename: Satoshi O
authors.initials: SO
authors.lastname: Suzuki
authors.forename: Kenta
authors.initials: K
authors.lastname: Masui
authors.forename: Koji
authors.initials: K
authors.lastname: Yoshimoto
authors.forename: Masahiro
authors.initials: M
authors.lastname: Mizoguchi
authors.forename: Makoto
authors.initials: M
authors.lastname: Hashizume
authors.forename: Peter
authors.initials: P
authors.lastname: Canoll
authors.forename: James E
authors.initials: JE
authors.lastname: Goldman
authors.forename: Tomio
authors.initials: T
authors.lastname: Sasaki
authors.forename: Toru
authors.initials: T
authors.lastname: Iwaki
mesh_terms: D000818:Animals; D001932:Brain Neoplasms / Q000473:pathology*; D002471:Cell Transformation, Neoplastic; D004195:Disease Models, Animal; D005910:Glioma / Q000473:pathology*; D009368:Neoplasm Transplantation; D020574:Proto-Oncogene Proteins c-sis / Q000502:physiology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012190:Retroviridae; D015398:Signal Transduction / Q000502:physiology*; D014407:Tumor Cells, Cultured
chemical_list: D020574:Proto-Oncogene Proteins c-sis