Search results for "3AB-OS"

Cellule staminali di osteosarcoma umano 3AB-OS: un modello per analizzare le proprietà oncogeniche di p53 mutata.

2013

Alterazioni del gene TP53 si riscontrano in circa il 50% dei tumori umani (1). Negli ultimi anni è stato dimostrato che la proteina mutata p53 (mp53) acquisisce nuove proprietà oncogeniche, definite “gain of function” (GOF), che contribuiscono alla progressione tumorale (2). In questo studio è stato analizzato lo stato del gene TP53, della proteina da esso espressa e il loro ruolo nella promozione della proliferazione, invasività, resistenza all’apoptosi e staminalità delle cellule 3AB-OS, una linea tumorale staminale precedentemente isolata dalle cellule di osteosarcoma umano MG63 (3). Analisi comparative di RT-PCR, Methylation-Specific-PCR (MSP), Fluorescent-in situ-hybridization (FISH) e…

Mutant p53 gain of function can be at the root of dedifferentiation of human osteosarcoma MG63 cells into 3AB-OS cancer stem cells

2014

Osteosarcoma is a highly metastatic tumor affecting adolescents, for which there is no second-line chemotherapy. As suggested for most tumors, its capability to overgrow is probably driven by cancer stem cells (CSCs), and finding new targets to kill CSCs may be critical for improving patient survival. TP53 is the most frequently mutated tumor suppressor gene in cancers and mutant p53 protein (mutp53) can acquire gain of function (GOF) strongly contributing to malignancy. Studies thus far have not shown p53-GOF in osteosarcoma. Here, we investigated TP53 gene status/role in 3AB-OS cells-a highly aggressive CSC line previously selected from human osteosarcoma MG63 cells-to evaluate its involv…

Human osteosarcoma 3AB-OS cancer stem cells is a model to study microRNA-29b-1 involvement in self-renewal and fate decisions of stem cells

2014

Modeling human osteosarcoma in mice through 3AB‐OS cancer stem cell xenografts

2012

Osteosarcoma is the second leading cause of cancer-related death for children and young adults. In this study, we have subcutaneously injected—with and without matrigel—athymic mice (Fox1nu/nu) with human osteosarcoma 3AB-OS pluripotent cancer stem cells (CSCs), which we previously isolated from human osteosarcoma MG63 cells. Engrafted 3AB-OS cells were highly tumorigenic and matrigel greatly accelerated both tumor engraftment and growth rate. 3AB-OS CSC xenografts lacked crucial regulators of beta-catenin levels (E-cadherin, APC, and GSK-3beta), and crucial factors to restrain proliferation, resulting therefore in a strong proliferation potential. During the first weeks of engraftment 3AB-…

MiR-29b-1 expression impaired Cancer Stem-Like properties of human osteosarcoma 3AB-OS cells in vitro.

2013

Osteosarcoma (OS) is the most common type of bone cancer, with a peak incidence in the early childhood. Emerging evidence suggests that treatments targeting cancer stem cells (CSCs) within a tumor can halt cancer and improve patient survival. Although microRNAs are frequently dysregulated in human cancers, if they influence OS malignancy and whether or not targeting CSC-associated microRNAs inhibit OS progression remain unclear. Recently (1), we described a predictive network for two downregulated miRNA family (let-7/98 and miR-29a,b,c) and their upregulated anticorrelated mRNAs. Here, we investigated in vitro the role of miR-29b-1 in regulating cell proliferation, clonogenic growth and che…

MicroRNA-29b-1 is involved in self-renewal and fate decisions of human osteosarcoma 3AB-OS cancer stem cells

2014

Emerging evidence suggests that treatments targeting cancer stem cells (CSCs) within a tumor can halt cancer and improve patient survival. Moreover, identification of CSC-related MicroRNAs (miRNAs) would provide information for a better understanding of CSCs. miR-29 family is a class of miRNAs aberrantly expressed in multiple cancers. They are frequently down-regulated in osteosarcoma (OS), the most common form of childhood cancer with a potent metastasizing potential. 3AB-OS CSC, a human pluripotent CSC line by us produced from the human osteosarcoma MG63 cells (1) is a useful model to study CSC origin and roles (2). Previously, we have shown that in 3AB-OS CSCs miR-29b is potently down-re…

Cellule staminali pluripotenti embrionali cancerose, loro preparazione e loro uso.

2008

Karyotypic Complexity and Chromosomal Aberrations In Human Embryonic Cancer Stem Cells 3AB-OS.

2009

MicroRNA-29b-1 impairs in vitro cell proliferation, self‑renewal and chemoresistance of human osteosarcoma 3AB-OS cancer stem cells

2014

Osteosarcoma (OS) is the most common type of bone cancer, with a peak incidence in the early childhood. Emerging evidence suggests that treatments targeting cancer stem cells (CSCs) within a tumor can halt cancer and improve patient survival. MicroRNAs (miRNAs) have been implicated in the maintenance of the CSC phenotype, thus, identification of CSC-related miRNAs would provide information for a better understanding of CSCs. Downregulation of miRNA-29 family members (miR-29a/b/c; miR‑29s) was observed in human OS, however, little is known about the functions of miR-29s in human OS CSCs. Previously, during the characterization of 3AB-OS cells, a CSC line selected from human OS MG63 cells, we…

A short story of 3AB-OS Cancer Stem Cells, a possible model for studying cancer stemness

2014

All tumors contain a population of Cancer Stem Cells (CSCs) responsible for the initiation, growth and development of the tumor and a challenge in cancer research is their identification and eradication. In our laboratory, by chemical treatment of the human osteosarcoma MG63 cell line, we have isolated and characterized the human OS CSC line (3AB-OS). 3AB-OS CSCs have a significant chromosomal complexity and a large number of molecular abnormalities which appear to be strongly congruent with those described in a large number of pediatric and adult osteosarcomas. 3AB-OS cells transdifferentiated in vitro into cells of all three primary germ layers and, when xenografted in athymic mice they w…