Estradiol activates chloride channels via estrogen receptor-α in the cell membranes of osteoblasts

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Abstract

Estrogen plays important roles in regulation of bone formation. Cl- channels in the ClC family are expressed in osteoblasts and are associated with bone physiology and pathology, but the relationship between Cl- channels and estrogen is not clear. In this study the action of estrogen on Cl- channels was investigated in the MC3T3-E1 osteoblast cell line. Our results show that 17β- estradiol could activate a current that reversed at a potential close to the Cl- equilibrium potential, with a sequence of anion selectivity of I- > Br- > Cl- > gluconate, and was inhibited by the Cl- channel blockers 5-nitro-2-(3-phenylpropylamino)-benzoate and 4,4=- diisothiocyano-2,2=-stilbene disulfonic acid. Knockdown of ClC-3 Cl- channel expression by a specific small interfering RNA to ClC-3 attenuated activation of the 17β-estradiol-induced Cl- current. Extracellular application of membrane-impermeable 17β-estradiol-albumin conjugates activated a similar current. The estrogen-activated Cl- current could be inhibited by the estrogen receptor (ER) antagonist fulvestrant (ICI 182780). The selective ER_ agonist, but not ERα agonist, activated a Cl- current similar to that induced by 17β- estradiol. Silencing ERα expression prevented activation of estrogeninduced currents. Immunofluorescence and coimmunoprecipitation experiments demonstrated that ClC-3 Cl- channels and ER_ were colocalized and closely related in cells. Estrogen promoted translocation of ClC-3 and ERα to the cell membrane from the nucleus. In conclusion, our findings show that Cl- channels can be activated by estrogen via ERα on the cell membrane and suggest that the ClC-3 Cl- channel may be one of the targets of estrogen in the regulation of osteoblast activity.

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Deng, Z., Peng, S., Zheng, Y., Yang, X., Zhang, H., Tan, Q., … Wang, L. (2017). Estradiol activates chloride channels via estrogen receptor-α in the cell membranes of osteoblasts. American Journal of Physiology - Cell Physiology, 313(2), C162–C172. https://doi.org/10.1152/ajpcell.00014.2017

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