Co-expression of 9-O-acetylated sialoglycoproteins and their binding proteins on lymphoblasts of childhood acute lymphoblastic leukaemia: an anti-apoptotic role

Mukerjee, Kankana ; Chava, Anil K. ; Mallick, Asish ; Chandra, Sarmila ; Bandyopadhyay, Suman ; Mandal, Chitra (2009) Co-expression of 9-O-acetylated sialoglycoproteins and their binding proteins on lymphoblasts of childhood acute lymphoblastic leukaemia: an anti-apoptotic role Biological Chemistry, 390 (4). pp. 325-335. ISSN 1431-6730

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1515/BC.2009.036

Related URL: http://dx.doi.org/10.1515/BC.2009.036

Abstract

Enhanced levels of 9-O-acetylated sialoglycoproteins (Neu5,9Ac2GPs) as disease-associated molecules was reported to act as signaling molecules for promoting survival of lymphoblasts in childhood acute lymphoblastic leukemia (ALL). Here, we searched for potential physiological ligands for Neu5,9Ac2GPs that could be involved in modulating the survival of lymphoblasts. Accordingly, we examined the presence of binding proteins for Neu5,9Ac2GPs on cell lines and primary cells of patients with B- and T-ALL, at presentation of the disease. Peripheral blood mononuclear cells from normal healthy donors and cells from myeloid leukemia patients were used for comparison. Neu5,9Ac2GPs-binding proteins (BPs) were specifically detected on the surface of both T- and B-ALL-lymphoblasts and ALL-cell lines along with the consistent presence of Neu5,9Ac2GPs. The Neu5,9Ac2GPs and BPs also co-localized on the cell surface and interacted specifically in vitro. Apoptosis of lymphoblasts, induced by serum starvation, was reversed in the presence of purified Neu5,9Ac2GPs due to possible engagement of BPs, and the anti-apoptotic role of this interaction was established. This is the first report of the presence of potential physiological ligands for disease-associated molecules like Neu5,9Ac2GPs, the interaction of which is able to trigger an anti-apoptotic signal conferring a survival advantage to leukemic cells in childhood ALL.

Item Type:Article
Source:Copyright of this article belongs to Walter de Gruyter GmbH & Co. KG.
Keywords:Achatinin-H; Apoptosis; Bcl-2/Bax Proteins; Physiological Ligands; Survival
ID Code:19376
Deposited On:22 Nov 2010 12:42
Last Modified:28 Feb 2011 08:47

Repository Staff Only: item control page