The role of membrane ER[alpha] signaling in bone and other major estrogen responsive tissues

• Published in: Scientific reports Vol. 6; p. 29473
• Main Authors: Gustafsson, K L, Farman, H, Henning, P, Lionikaite, V, Movérare-skrtic, S, Wu, J, Ryberg, H, Koskela, A, Gustafsson, J-Å, Tuukkanen, J, Levin, E R, Ohlsson, C, Lagerquist, M K
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group 01.07.2016
• Subjects: Biology; Bones; Estrogens; Fractures; Localization; Medical research; Mutation; Ovaries; Steroids; Uterus; Womens health; Sweden
• ISSN: 2045-2322
• DOI: 10.1038/srep29473

Estrogen receptor α (ERα) signaling leads to cellular responses in several tissues and in addition to nuclear ERα-mediated effects, membrane ERα (mERα) signaling may be of importance. To elucidate the significance, in vivo, of mERα signaling in multiple estrogen-responsive tissues, we have used female mice lacking the ability to localize ERα to the membrane due to a point mutation in the palmitoylation site (C451A), so called Nuclear-Only-ER (NOER) mice. Interestingly, the role of mERα signaling for the estrogen response was highly tissue-dependent, with trabecular bone in the axial skeleton being strongly dependent (>80% reduction in estrogen response in NOER mice), cortical and trabecular bone in long bones, as well as uterus and thymus being partly dependent (40-70% reduction in estrogen response in NOER mice) and effects on liver weight and total body fat mass being essentially independent of mERα (<35% reduction in estrogen response in NOER mice). In conclusion, mERα signaling is important for the estrogenic response in female mice in a tissue-dependent manner. Increased knowledge regarding membrane initiated ERα actions may provide means to develop new selective estrogen receptor modulators with improved profiles.