Identification of novel functional and spatial associations between sphingosine kinase 1, sphingosine 1-phosphate receptors and other signaling proteins that affect prognostic outcome in estrogen receptor-positive breast cancer

Jan Ohotski, Joanne Edwards, Beatrix Elsberger, Carol Watson, Clare Orange, Elizabeth Mallon, Susan Pyne, Nigel J. Pyne

    Research output: Contribution to journalArticle

    32 Citations (Scopus)

    Abstract

    Sphingosine kinase is an enzyme that catalyses the phosphorylation of sphingosine to form sphingosine 1-phosphate. Sphingosine 1-phosphate is a bioactive lipid, which has been shown to have an important role in promoting the survival, growth and invasiveness of cancer cells. Sphingosine 1-phosphate binds to five different plasma membrane sphingosine 1-phosphate receptors (S1P(1-5) ) and can regulate intracellular target proteins. We have used immunohistochemical analysis to determine the concurrent expression levels of sphingosine kinase 1 or S1P receptors and other signaling proteins in estrogen receptor-positive breast cancer tumors and have then assessed the impact of these combinations on clinical outcome. This approach has enabled identification of (i) novel biomarkers and (ii) several spatially controlled associations between either sphingosine kinase 1 or S1P(1-3) and other signaling proteins whose combination affect prognosis. For instance, the translocation of sphingosine kinase 1 to the plasma membrane has been shown to be a critical determinant in cancer progression. However, our findings identify an additional novel role for the nuclear localization of sphingosine kinase 1 combined with either ERK-1/2 or SFK or LYN or AKT or NF-?B, which significantly shortens disease-specific survival and/or recurrence. We also demonstrate that nuclear S1P(2) receptor and c-SRC are associated with improved prognosis and this is linked with a reduction in the nuclear localization of sphingosine kinase 1. These findings identify potential novel biomarker associations, which might serve as new targets for drug intervention designed to improve treatment of estrogen receptor-positive breast cancer.
    Original languageEnglish
    Pages (from-to)605-616
    Number of pages12
    JournalInternational Journal of Cancer
    Volume132
    Issue number3
    DOIs
    Publication statusPublished - 1 Feb 2013

    Keywords

    • Aged
    • Breast Neoplasms
    • Cell Membrane
    • Cell Nucleus
    • Extracellular Signal-Regulated MAP Kinases
    • Female
    • Humans
    • Lysophospholipids
    • Middle Aged
    • NF-kappa B
    • Phosphorylation
    • Phosphotransferases (Alcohol Group Acceptor)
    • Prognosis
    • Proto-Oncogene Proteins c-akt
    • Receptors, Estrogen
    • Receptors, Lysosphingolipid
    • Signal Transduction
    • Sphingosine
    • Tamoxifen
    • Tumor Markers, Biological
    • src-Family Kinases

    Fingerprint Dive into the research topics of 'Identification of novel functional and spatial associations between sphingosine kinase 1, sphingosine 1-phosphate receptors and other signaling proteins that affect prognostic outcome in estrogen receptor-positive breast cancer'. Together they form a unique fingerprint.

    Cite this