Newswire (Published: Tuesday, January 9, 2018, Received: Friday, January 5, 2018, 12:04:47 PM CST)

Word Count: 298

By a News Reporter-Staff News Editor at Cancer Weekly -- Hokkaido University researchers have uncovered a cellular protein that stabilizes a tumor promoting signaling pathway, suggesting a new target to treat prostate cancer (see also Hokkaido University).

The drug Gefitinib is used to treat breast, lung, and other cancers by inhibiting epidermal growth factor receptor (EGFR) signaling, but it has only a limited effect on prostate cancer. EGFR, present on the cell membrane, is involved in cell proliferation and the development of dermis, lung, and digestive tissues. When a mutation causes its over-activation, it can lead to increased cell proliferation and tumor formation.

Tadashi Matsuda of Hokkaido University and his colleagues in Japan investigated human prostate cancer cells to determine if there is an unknown up-regulation mechanism in the EGFR pathway.

When EGFR is attached to a small protein called ubiquitin, it is given "the kiss of death" and tagged for degradation inside the cell. This tagging process is facilitated by a protein called c-CBL. The degradation of EGFR leads to less signaling from the receptor and reduced cell proliferation.

Matsuda and his team found that signal-transducing adaptor protein-2 (STAP-2) stabilizes EGFR by inhibiting its c-CBL-mediated ubiquitination. Furthermore, when the team suppressed STAP-2, the prostate cancer cells showed reduced proliferation and did not form a tumor when transplanted into mice.

"STAP-2 inhibitors could play a role in treating Gefitinib-resistant prostate cancers. Further studies on STAP-2 will provide new insights into cancer physiology and support the development of anticancer therapies," says Tadashi Matsuda. The study was published in the Journal of Biological Chemistry.

Keywords for this news article include: Cancer, Oncology, Cell Proliferation, Health and Medicine, Hokkaido University.

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Hokkaido University

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Eastern Asia
Japan
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Subjects

Science and Technology
      Scientific Research
Health and Wellness
      Medical Conditions and Diseases
            Cancer
                  Prostate Cancer
            Men's Health Issues
                  Prostate Cancer
      Treatments and Therapies
            Medicinal Drugs
            Growth Factors and Cytokines