Phosphatidylinositol 3-kinase inhibition potentiates glucocorticoid response in B-cell acute lymphoblastic leukemia.

Abstract:

:Despite remarkable progress in polychemotherapy protocols, pediatric B-cell acute lymphoblastic leukemia (B-ALL) remains fatal in around 20% of cases. Hence, novel targeted therapies are needed for patients with poor prognosis. Glucocorticoids (GCs) are drugs commonly administrated for B-ALL treatment. Activation of the phosphatidylinositol 3-kinase (PI3K)/Akt/mammalian target of rapamycin signaling pathway is frequently observed in B-ALL and contributes to GC-resistance. Here, we analyzed for the first time to our knowledge, the therapeutic potential of pan and isoform-selective PI3K p110 inhibitors, alone or combined with dexamethasone (DEX), in B-ALL leukemia cell lines and patient samples. We found that a pan PI3K p110 inhibitor displayed the most powerful cytotoxic effects in B-ALL cells, by inducing cell cycle arrest and apoptosis. Both a pan PI3K p110 inhibitor and a dual γ/δ PI3K p110 inhibitor sensitized B-ALL cells to DEX by restoring nuclear translocation of the GC receptor and counteracted stroma-induced DEX-resistance. Finally, gene expression analysis documented that, on one hand the combination consisting of a pan PI3K p110 inhibitor and DEX strengthened the DEX-induced up- or down-regulation of several genes involved in apoptosis, while on the other, it rescued the effects of genes that might be involved in GC-resistance. Overall, our findings strongly suggest that PI3K p110 inhibition could be a promising strategy for treating B-ALL patients by improving GC therapeutic effects and/or overcoming GC-resistance.

journal_name

J Cell Physiol

authors

Evangelisti C,Cappellini A,Oliveira M,Fragoso R,Barata JT,Bertaina A,Locatelli F,Simioni C,Neri LM,Chiarini F,Lonetti A,Buontempo F,Orsini E,Pession A,Manzoli L,Martelli AM,Evangelisti C

doi

10.1002/jcp.26135

subject

Has Abstract

pub_date

2018-03-01 00:00:00

pages

1796-1811

issue

3

eissn

0021-9541

issn

1097-4652

journal_volume

233

pub_type

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