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- W2057493003 abstract "Abstract We have previously demonstrated induction of O ‐acetylated sialoglycoproteins on lymphoblasts of childhood acute lymphoblastic leukaemia (ALL). These molecules promote survival of lymphoblasts by preventing apoptosis. Although O ‐acetylated sialoglycoproteins are over expressed, the status of O ‐acetylation of gangliosides and their role in lymphoblasts survival remains to be explored in ALL patients. Here, we have observed enhanced levels of 9‐ O ‐acetylated GD3 (9‐ O ‐AcGD3) in the lymphoblasts of patients and leukaemic cell line versus disialoganglioside GD3 in comparison to the normal cells. Localization of GD3 and 9‐ O ‐AcGD3 on mitochondria of patient's lymphoblasts has been demonstrated by immuno‐electron microscopy. The exogenous administration of GD3‐induced apoptosis in lymphoblasts as evident from the nuclear fragmentation and sub G0/G1 apoptotic peak. In contrast, 9‐ O ‐AcGD3 failed to induce such apoptosis. We further explored the mitochondria‐dependent pathway triggered during GD3‐induced apoptosis in lymphoblasts. GD3 caused a time‐dependent depolarization of mitochondrial membrane potential, release of cytochrome c and 7.4‐ and 8‐fold increased in caspase 9 and caspase 3 activity respectively. However, under identical conditions, an equimolar concentration of 9‐ O ‐AcGD3 failed to induce similar effects. Interestingly, 9‐ O ‐AcGD3 protected the lymphoblasts from GD3‐induced apoptosis when administered in equimolar concentrations simultaneously. In situ de‐ O ‐acetylation of 9‐ O ‐AcGD3 with sodium salicylate restores the GD3‐responsiveness to apoptotic signals. Although both GD3 and 9‐ O ‐acetyl GD3 localize to mitochondria, these two structurally related molecules may play different roles in ALL‐disease biology. Taken together, our results suggest that O ‐acetylation of GD3, like that of O ‐acetylated sialoglycoproteins, might be a general strategy adopted by leukaemic blasts towards survival in ALL. J. Cell. Biochem. 105: 724–734, 2008. © 2008 Wiley‐Liss, Inc." @default.
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- W2057493003 date "2008-07-24" @default.
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- W2057493003 title "<i>O</i>‐acetylation of GD3 prevents its apoptotic effect and promotes survival of lymphoblasts in childhood acute lymphoblastic leukaemia" @default.
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- W2057493003 doi "https://doi.org/10.1002/jcb.21867" @default.
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