We performed comparative proteomic analyses of pituitary tumor-derived cell lines, and found a new protein, preliminarily called hydrophobestin, which was produced only in somatotrophic cells, MtT/S, but not in non-hormone-producing cells, MtT/E. Hydrophobestin is encoded by the cell growth regulatory gene, Cgr11, which is known to have growth-suppressive potential in several cell lines. We have now sought to investigate the underlying events responsible for cell growth inhibition by hydrophobestin.
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