title: The PML growth-suppressor has an altered expression in human oncogenesis.
abstract: Altered sub-nuclear localisation of the nuclear body-associated PML protein in acute promyelocytic leukaemia, has been proposed to contribute to leukaemogenesis. We have recently shown that PML is a primary target gene of interferons. Here, it is shown that PML has growth suppressive properties and displays an altered expression pattern during human oncogenesis. PML is widely expressed in cell-lines and is cell-cycle regulated. Overexpression of the protein induces a sharp reduction in growth rates in vitro and in vivo. In contrast with cell-lines, in normal tissues (including those that rapidly proliferate) only a few cells have detectable PML levels. However, these can be upregulated by soluble factors (e.g. IFN, estrogens). Human epithelial tumors show a gradual increase of PML levels as the lesion progresses from benign dysplasia to carcinoma. A similar induction is found in the surrounding stroma and vessels, which likely results from paracrine interactions. Strikingly, when malignant cells turn invasive, they loose PML expression, while expression is conserved in the stromal compartment. These observations point to the existence of a consistent deregulation in the expression of the PML growth-suppressor during human oncogenesis.
authors.affiliation: CNRS UPR 43, Centre Hayem, Hôpital St. Louis, Paris.
authors.forename: M H
authors.initials: MH
authors.lastname: Koken
authors.forename: G
authors.initials: G
authors.lastname: Linares-Cruz
authors.forename: F
authors.initials: F
authors.lastname: Quignon
authors.forename: A
authors.initials: A
authors.lastname: Viron
authors.forename: M K
authors.initials: MK
authors.lastname: Chelbi-Alix
authors.forename: J
authors.initials: J
authors.lastname: Sobczak-Thépot
authors.forename: L
authors.initials: L
authors.lastname: Juhlin
authors.forename: L
authors.initials: L
authors.lastname: Degos
authors.forename: F
authors.initials: F
authors.lastname: Calvo
authors.forename: H
authors.initials: H
authors.lastname: de Thé
mesh_terms: D000818:Animals; D002453:Cell Cycle; D004967:Estrogens / Q000502:physiology; D005260:Female; D006131:Growth Inhibitors; D006801:Humans; D007150:Immunohistochemistry; D066298:In Vitro Techniques; D051379:Mice; D008819:Mice, Nude; D009363:Neoplasm Proteins; D009368:Neoplasm Transplantation; D009369:Neoplasms / Q000378:metabolism*; D009687:Nuclear Proteins; D000071156:Promyelocytic Leukemia Protein; D012867:Skin / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism*; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured; D025521:Tumor Suppressor Proteins
chemical_list: D004967:Estrogens; D006131:Growth Inhibitors; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; C513293:Pml protein, mouse; D000071156:Promyelocytic Leukemia Protein; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins; C070576:PML protein, human