Abstract:
:The differentiation therapy in treatment of acute promyelocytic leukemia (APL), based on the administration of all-trans retinoic acid (ATRA), is currently flanked with the use of As2O3, a safe and effective agent for patients showing a resistance to ATRA treatment. A synergy between ATRA and As3O3 was also reported in inducing granulocytic differentiation of APL-derived cells. We have demonstrated that phospholipase C-beta2 (PLC-beta2), highly expressed in neutrophils and nearly absent in tumoral promyelocytes, largely increases during ATRA treatment of APL-derived cells and strongly correlates with the responsiveness of APL patients to ATRA-based differentiating therapies. Here we report that, in APL-derived cells, low doses of As3O3 induce a slight increase of PLC-beta2 together with a moderate maturation, and cooperate with ATRA to provoke a significant increase of PLC-beta2 expression. Remarkably, the amounts of PLC-beta2 draw a parallel with the differentiation levels reached by both ATRA-responsive and -resistant cells treated with ATRA/As2O3 combinations. PLC-beta2 is not necessary for the progression of tumoral promyelocytes along the granulocytic lineage and is unable to overcome the differentiation block or to potentiate the agonist-induced maturation. On the other hand, since its expression closely correlates with the differentiation level reached by APL-derived cells induced to maturate by drugs presently employed in APL therapies, PLC-beta2 represents indeed a specific marker to test the ability of differentiation agents to induce the release of the maturation blockade of tumoral myeloid precursors.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Brugnoli F,Bovolenta M,Benedusi M,Miscia S,Capitani S,Bertagnolo Vdoi
10.1002/jcb.20749subject
Has Abstractpub_date
2006-05-01 00:00:00pages
160-73issue
1eissn
0730-2312issn
1097-4644journal_volume
98pub_type
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