Reversal of malignant phenotype in human osteosarcoma cells transduced with the alkaline phosphatase gene.
Bone
; 26(3): 215-20, 2000 Mar.
Article
em En
| MEDLINE
| ID: mdl-10709992
ABSTRACT
Alkaline phosphatases are a family of glycoproteins that are able to hydrolize various monophosphate esters at a high pH optimum. Liver/bone/kidney (L/B/K) alkaline phosphatase (ALP) is one of the four major isoenzymes that belong to this family. Apart from its role in normal bone mineralization, other functions of L/B/K ALP remain obscure, both in physiological and in neoplastic conditions, including the bone-forming tumor osteosarcoma. In this study, we transfected the U-2 OS osteosarcoma cell line, which does not show any basal expression of this enzyme, with the full-length gene of L/B/K ALP, and analyzed the in vitro and in vivo features of four transfectants showing different expression of L/B/K ALP. A reduced in vitro ability to invade Matrigel and to grow in a semi-solid medium, together with a lower tumorigenic and metastatic ability in athymic mice, was found to be associated with a high level of cell surface L/B/K ALP activity. Moreover, L/B/K ALP transfectants showed a reduced secretion of matrix metalloproteinase-9 enzyme. These findings indicate a loss of aggressiveness of osteosarcoma cells after the expression of L/B/K ALP on their surface and suggest a new role for this enzyme.
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Base de dados:
MEDLINE
Assunto principal:
Transdução Genética
/
Osteossarcoma
/
Fosfatase Alcalina
Idioma:
En
Ano de publicação:
2000
Tipo de documento:
Article