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Ref Type Journal Article
PMID (22391131)
Authors Tzenaki N, Andreou M, Stratigi K, Vergetaki A, Makrigiannakis A, Vanhaesebroeck B, Papakonstanti EA
Title High levels of p110δ PI3K expression in solid tumor cells suppress PTEN activity, generating cellular sensitivity to p110δ inhibitors through PTEN activation.
Journal FASEB journal : official publication of the Federation of American Societies for Experimental Biology
Vol 26
Issue 6
Date 2012 Jun
URL
Abstract Text Class IA PI3K isoforms have divergent, nonredundant cell biological roles. In untransformed cells and tissues, p110α and p110β are ubiquitously expressed, whereas p110δ expression is highly enriched in leukocytes. High levels of p110δ expression have been documented in some solid tumor cell lines, but the functional role is unknown. This study aimed to elucidate the link between elevated expression of p110δ PI3K and cancer. We report that in breast and prostate cancer cells that contain leukocyte levels of p110δ, p110δ activity dampens the activity of the PTEN tumor suppressor. Indeed, inactivation of p110δ in these cells led to PTEN activation, suppression of Akt phosphorylation, and inhibition of cell proliferation, with inhibition of PTEN activity being able to counterbalance p110δ inactivation. Likewise, forced overexpression of p110δ in cells with low p110δ expression reduced PTEN activity, resulting in increased Akt phosphorylation. Our data indicate that the oncogenic potential of p110δ PI3K overexpression might at least partially act through PTEN inactivation, and that p110δ-selective PI3K inhibitors can have a dual antitumor mechanism, namely by directly inhibiting p110δ signaling and by a broader inhibition of class I PI3K activity through PTEN activation. These data may have important implications in the intervention of breast cancer.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
IC87114 IC87114 0 0
Drug Name Trade Name Synonyms Drug Classes Drug Description
IC87114 IC-87114|IC 87114 PIK3CD inhibitor 25 IC87114 is a small molecule selective PIK3CD inhibitor, which may result in decreased tumor cell survival (PMID: 23275335, PMID: 22391131, PMID: 29236327).
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
PIK3CA E545K cervical cancer sensitive PW12 Preclinical Actionable In a preclinical study, PW12 inhibited proliferation of cervical cancer cells with a PIK3CA E545K mutation (PMID: 22391131). 22391131