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• W2014248023 abstract "The signaling mechanisms of estrogens interact with those of growth factors to control the pituitary gland functions. The contribution of the membrane bound estrogen receptor in these actions is not fully understood. In this study, we focused on the regulatory action of estradiol in interaction with insulin on the secretory and proliferative lactotroph cell activities from primary pituitary cell cultures. Furthermore, we studied the involvement of ERK1/2, PKC epsilon and Pit-1 in these actions. In serum free conditions, estradiol and estradiol-BSA promoted a differential secretory activity on PRL cells but were unable to induce lactotroph cell proliferation. However, both free and conjugated estradiol were competent arresting the mitogenic activity promoted by insulin. Estradiol, estradiol-BSA and insulin stimuli increased the PKC epsilon, phosphorylated ERK 1/2 and Pit-1 expression, although combined treatments with estradiol/insulin or estradiol-BSA/insulin induced a significant reduction in these levels, in close correlation with the decrease of lactotroph cell proliferation. The pre-treatment with PKC inhibitor BIM significantly inhibited the ERK activation promoted by insulin without modifying the ERK expression levels induced by estradiol or estradiol-BSA. By immuno-electron-microscopy the alpha nuclear estrogen receptor was localized in the plasma membrane of lactotroph cells. These findings suggest that the membrane bound ER participates modulating lactotroph cells proliferation via PKC epsilon, ERK1/2 and Pit-1. The interactions between estradiol and growth factors, inducing both mitogenic and antimitogenic effects, could provide glandular plasticity preventing an over-proliferation induced by growth factors." @default.
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• W2014248023 date "2008-05-01" @default.
• W2014248023 modified "2023-10-15" @default.
• W2014248023 title "Estradiol interacts with insulin through membrane receptors to induce an antimitogenic effect on lactotroph cells" @default.
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• W2014248023 doi "https://doi.org/10.1016/j.steroids.2008.01.002" @default.
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