MiR-497 suppresses cycle progression through an axis involving CDK6 in ALK-positive cells.

MiR-497 suppresses cycle progression through an axis involving CDK6 in ALK-positive cells. Haematologica. 2018 Sep 27;: Authors: Hoareau-Aveilla C, Quelen C, Congras A, Caillet N, Labourdette D, Dozier C, Brousset P, Lamant L, Meggetto F Abstract Anaplastic large-cell lymphoma, a T cell neoplasm, is primarily a pediatric disease. 75% of pediatric anaplastic large-cell lymphoma cases harbor the chromosomal translocation t(2;5)(p23;q35) leading to the ectopic expression of NPM-ALK, a chimeric tyrosine kinase. NPM-ALK consists of an N-terminal nucleophosmin (NPM) domain fused to an anaplastic lymphoma kinase (ALK) cytoplasmic domain. Pediatric NPM-ALK(+) anaplastic large-cell lymphoma is often a disseminated disease and young patients are prone to chemoresistance or relapse shortly after chemotherapeutic treatment. Furthermore, there is no gold standard protocol for the treatment of relapses. To the best of our knowledge, this is the first study on the potential role of the microRNA, miR-497, in NPM-ALK(+) anaplastic large-cell lymphoma tumorigenesis. Our results show that miR-497 expression is repressed in NPM-ALK(+) cell lines and patient samples through the hypermethylation of its promoter and the activity of NPM-ALK is responsible for this epigenetic repression. We demonstrate that overexpression of miR-497 in human NPM-ALK(+) anaplastic large-cell lymphoma cells inhibits cellular growth and causes cell cycle arrest by targeting CDK...
Source: Haematologica - Category: Hematology Authors: Tags: Haematologica Source Type: research