Requirements of phosphatidylinositol-3 kinase and mammalian target of rapamycin for estrogen-induced proliferation in uterine leiomyoma- and myometrium-derived cell lines

E2 significantly induces G1 cell cycle progression and cell proliferation in uterine smooth muscle-derived cells and uterine leiomyoma-derived cells, in which phosphatidylinositol-3 kinase and mammalian target of rapamycin are essentially required.