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  • Title: Expression and activation of mitogen-activated protein kinase in the human endometrium during the menstrual cycle.
    Author: Ozaki T, Takahashi K, Kanasaki H, Miyazaki K.
    Journal: Am J Obstet Gynecol; 2006 Nov; 195(5):1343-50. PubMed ID: 16796978.
    Abstract:
    OBJECTIVE: The purpose of this study was to investigate the fluctuation of expression and activation of mitogen-activated protein kinase in normal human endometrium throughout the menstrual cycle. STUDY DESIGN: Thirty-three normal endometrial tissues were obtained from fertile women who had undergone hysterectomies for reasons other than endometrial disease. Extracellular signal-regulated kinase, -1, and -2 expression were studied by immunohistochemistry. Moreover, extracellular signal-regulated kinase activity was analyzed by gel kinase assay. RESULTS: Western blotting analysis with anti-pan-extracellular signal-regulated kinase antibody mainly demonstrated an immunoreactive band of 42 kd that corresponded to extracellular signal-regulated kinase 2 in the endometrium. The expression of extracellular signal-regulated kinase 2 tended to increase in the secretory phase. Immunohistochemical analysis for extracellular signal-regulated kinase 1 in endometrial sections revealed a weak staining of glands and almost no staining of stromal cells. Immunohistochemical analysis for extracellular signal-regulated kinase 2 in endometrial sections revealed a distinct staining of glands in both proliferative and secretory phases and a weak staining of stromal cells. Although the intensity of staining for extracellular signal-regulated kinase 2 in stromal cells did not change during the secretory phase, in the glands the extracellular signal-regulated kinase 2 was highly stained in the mid-to-late secretory phase. In gel kinase assay revealed that extracellular signal-regulated kinase activity was increased significantly in the mid-to-late secretory phase. CONCLUSION: Expression and activation of extracellular signal-regulated kinase in the human endometrium was increased particularly during the secretory phase. We suggest that fluctuation of extracellular signal-regulated kinase in the human endometrium may be induced by ovarian steroid hormones.
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