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Phosphorylated 4E-binding protein 1 (p-4E-BP1): a novel prognostic marker in human astrocytomas

Authors

  • Penelope Korkolopoulou,

    1. First Department of Pathology, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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    • These authors contributed equally to this work.

  • Georgia Levidou,

    1. First Department of Pathology, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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    • These authors contributed equally to this work.

  • Elias A El-Habr,

    1. First Department of Pathology, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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    • These authors contributed equally to this work.

  • Christina Piperi,

    1. Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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    • These authors contributed equally to this work.

  • Christos Adamopoulos,

    1. Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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  • Vassilis Samaras,

    1. First Department of Pathology, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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  • Efstathios Boviatsis,

    1. Department of Neurosurgery, Medical School, National and Kapodistrian University of Athens, Evangelismos Hospital, 10676, Athens, Greece
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  • Irene Thymara,

    1. First Department of Pathology, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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  • Eleni-Andriana Trigka,

    1. First Department of Pathology, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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  • Stratigoula Sakellariou,

    1. First Department of Pathology, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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  • Nikolaos Kavantzas,

    1. First Department of Pathology, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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  • Efstratios Patsouris,

    1. First Department of Pathology, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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  • Angelica A Saetta

    1. First Department of Pathology, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
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E A El-Habr, 75 Mikras Asias Street, First Department of Pathology, National and Kapodistrian University of Athens, Medical School, 11527 Athens, Greece. e-mails: elhabere@yahoo.com; elias.el-habr@inserm.fras

Abstract

Korkolopoulou P, Levidou G, El-Habr E A, Piperi C, Adamopoulos C, Samaras V, Boviatsis E, Thymara I, Trigka E-A, Sakellariou S, Kavantzas N, Patsouris E & Saetta A A
(2012) Histopathology 61, 293–305

Phosphorylated 4E-binding protein 1 (p-4E-BP1): a novel prognostic marker in human astrocytomas

Aims:  To investigate the significance of the mammalian target of rapamycin (mTOR) pathway in astrocytic tumours, published information in this context being limited, especially regarding phosphorylated 4E-binding protein (p-4E-BP) 1.

Methods and results:  Paraffin-embedded tissue from 111 patients with astroglial tumours (grades II–IV) was investigated for the association of phosphorylated mTOR (p-mTOR) signalling components with phosphorylated extracellular signal-related kinase 1/2 (p-ERK1/2) and phosphorylated AKT (p-AKT) expression, clinicopathological features, angiogenesis, isocitrate dehydrogenase 1 (IDH1)-R132H, and survival. Expression was also quantified by western blot analysis in 12 cases and in three primary glioma cell cultures following rapamycin treatment. p-mTOR expression correlated with p-4E-BP1 expression and marginally with p-p70S6K expression. p-4E-BP1 expression increased with tumour grade. Rapamycin induced a decline in phosphorylation levels of all three proteins. Nuclear p-AKT and cytoplasmic p-ERK1/2 immunoexpression correlated with p-4E-BP1 expression, whereas cytoplasmic p-AKT expression correlated with p-p70S6K expression. All three proteins were associated with increased angiogenesis but not with IDH1-R132H expression status. p-mTOR adversely affected overall and disease-free survival in univariate analysis. In multivariate survival analysis, the presence of p-4E-BP1 predicted shortened overall survival in the entire cohort and glioblastomas.

Conclusions:  mTOR signalling components are differentially involved in the acquisition of a more aggressive and angiogenic phenotype in astrocytic tumours. Moreover, p-4E-BP1 emerges as a novel prognostic marker, which might aid in the selection of patients who are more likely to benefit from therapy with mTOR inhibitors.

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