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21.03.2018 19:00

Researchers Discover New Anti-Cancer Protein

Cornelia Niggli Kommunikation & Marketing
Universität Basel

    An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.

    The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled in Switzerland. Hepatocellular carcinoma is usually diagnosed at a very late stage when the liver is already severely damaged and hence overall prognosis is poor. Detection of the anti-cancer protein LHPP as a biomarker may allow clinicians to provide better treatment options.

    New anti-cancer protein LHPP

    Liver tumors develop from mutated cells that grow and proliferate uncontrollably. Anti-cancer proteins, so-called tumor suppressors, prevent uncontrolled cell growth. Tumor suppressors are often defective in cancer cells. The researchers led by Prof. Michael N. Hall, Biozentrum of the University of Basel, have now discovered a new, so far unknown tumor suppressor, the protein LHPP. In their study, they show that the loss of LHPP promotes tumor growth and reduces the chance of survival of cancer patients. LHPP could potentially be used as a prognostic biomarker.

    The researchers generated a mouse model for hepatocellular carcinoma by activating mTOR signaling specifically in the liver. They analyzed a total of more than 4,000 proteins, comparing them in healthy and tumor tissue. An enzyme emerged as the top favorite: the histidine phosphatase LHPP. “It is striking that LHPP is present in healthy tissue and completely absent in tumor tissue,” says first author Sravanth Hindupur. Re-introduction of the genetic information for LHPP by the researchers prevents the formation of tumors and maintains liver function.

    Loss of LHPP in cancer patients

    “Similar to the mouse model, we also saw a striking decrease in LHPP levels in tumors of patients with liver cancer,” says Hindupur. Additionally, both disease severity and life expectancy correlate with LHPP levels. With complete loss of the tumor suppressor, cancer patients die on average two years earlier. LHPP is useful as a biomarker to classify tumors.

    Phosphorylation important for tumorigenesis

    LHPP is a phosphatase that removes histidine-linked phosphate groups from proteins. Like all amino acids, histidine is a basic component of proteins. Histidine phosphorylation of proteins has been poorly investigated due to the lack of suitable tools. “Tony Hunter, from the Salk Institute in the USA, has provided us with new tools to analyze histidine phosphorylation. We have now been able to visualize a whole new layer of complexity in tumor formation,” says Hindupur.

    Due to the absence of LHPP, global protein histidine phosphorylation is increased, which can lead to activation of several important functions and uncontrolled cell proliferation. This absence promotes the growth of tumors via increasing histidine-phosphorylated proteins. The tumor suppressor LHPP may also play a role in the development of other cancers.

    Original source

    Sravanth K. Hindupur, Marco Colombi, Stephen R. Fuhs, Matthias S. Matter, Yakir Guri, Kevin Adam, Marion Cornu, Salvatore Piscuoglio, Charlotte K.Y. Ng, Charles Betz, Dritan Liko, Luca Quagliata, Suzette Moes, Paul Jenoe, Luigi M. Terracciano, Markus H. Heim, Tony Hunter, Michael N. Hall
    The protein histidine phosphatase LHPP is a tumor suppressor
    Nature (2018), doi: 10.1038/nature26140

    Further Information

    Prof. Dr. Michael Hall, University of Basel, Biozentrum, phone: +41 61 207 21 50, email: m.hall@unibas.ch

    Dr. Katrin Bühler, University of Basel, Biozentrum, Communications, phone +41 61 207 09 74, email: katrin.buehler@unibas.ch


    Bilder

    Scanning electron micrsocopy image of cancer cells
    Scanning electron micrsocopy image of cancer cells
    (Image: University of Basel, Biozentrum/Swiss Nanoscience Institute)
    None


    Merkmale dieser Pressemitteilung:
    Journalisten, Wissenschaftler
    Biologie, Ernährung / Gesundheit / Pflege, Medizin
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    Forschungsergebnisse, Wissenschaftliche Publikationen
    Englisch


     

    Scanning electron micrsocopy image of cancer cells


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