TY - JOUR
T1 - A G-protein-coupled estrogen receptor is involved in hypothalamic control of energy homeostasis
AU - Qiu, Jian
AU - Bosch, Martha A.
AU - Tobias, Sandra C.
AU - Krust, Andree
AU - Graham, Sharon M.
AU - Murphy, Stephanie J.
AU - Korach, Kenneth S.
AU - Chambon, Pierre
AU - Scanlan, Thomas S.
AU - Rønnekleiv, Oline K.
AU - Kelly, Martin J.
PY - 2006
Y1 - 2006
N2 - Estrogens are involved in the hypothalamic control of multiple homeostatic functions including reproduction, stress responses, energy metabolism, sleep cycles, temperature regulation, and motivated behaviors. The critical role of 17β-estradiol (E2) is evident in hypoestrogenic states (e.g., postmenopause) in which many of these functions go awry. The actions of E 2 in the brain have been attributed to the activation of estrogen receptors α and β through nuclear, cytoplasmic, or membrane actions. However, we have identified a putative membrane-associated estrogen receptor that is coupled to desensitization of GABAB and μ-opioid receptors in guinea pig and mouse hypothalamic proopiomelanocortin neurons. We have synthesized a new nonsteroidal compound, STX, which selectively targets the Gαq-coupled phospholipase C-protein kinase C-protein kinase A pathway, and have established that STX is more potent than E2 in mediating this desensitization in an ICI 182, 780-sensitive manner in both guinea pig and mouse neurons. Both E2 and STX were fully efficacious in estrogen receptor α,β knock-out mice. Moreover, in vivo treatment with STX, similar to E2, attenuated the weight gain in hypoestrogenic female guinea pigs. Therefore, this membrane-delimited signaling pathway plays a critical role in the control of energy homeostasis and may provide a novel therapeutic target for treatment of postmenopausal symptoms and eating disorders in females.
AB - Estrogens are involved in the hypothalamic control of multiple homeostatic functions including reproduction, stress responses, energy metabolism, sleep cycles, temperature regulation, and motivated behaviors. The critical role of 17β-estradiol (E2) is evident in hypoestrogenic states (e.g., postmenopause) in which many of these functions go awry. The actions of E 2 in the brain have been attributed to the activation of estrogen receptors α and β through nuclear, cytoplasmic, or membrane actions. However, we have identified a putative membrane-associated estrogen receptor that is coupled to desensitization of GABAB and μ-opioid receptors in guinea pig and mouse hypothalamic proopiomelanocortin neurons. We have synthesized a new nonsteroidal compound, STX, which selectively targets the Gαq-coupled phospholipase C-protein kinase C-protein kinase A pathway, and have established that STX is more potent than E2 in mediating this desensitization in an ICI 182, 780-sensitive manner in both guinea pig and mouse neurons. Both E2 and STX were fully efficacious in estrogen receptor α,β knock-out mice. Moreover, in vivo treatment with STX, similar to E2, attenuated the weight gain in hypoestrogenic female guinea pigs. Therefore, this membrane-delimited signaling pathway plays a critical role in the control of energy homeostasis and may provide a novel therapeutic target for treatment of postmenopausal symptoms and eating disorders in females.
KW - Body weight
KW - GABA receptor
KW - GPCR
KW - Intracellular signaling
KW - POMC neurons
KW - Potassium channels
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U2 - 10.1523/JNEUROSCI.0327-06.2006
DO - 10.1523/JNEUROSCI.0327-06.2006
M3 - Article
C2 - 16723521
AN - SCOPUS:33744970064
SN - 0270-6474
VL - 26
SP - 5649
EP - 5655
JO - Journal of Neuroscience
JF - Journal of Neuroscience
IS - 21
ER -