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• W1978190003 endingPage "R669" @default.
• W1978190003 startingPage "R661" @default.
• W1978190003 abstract "The subfornical organ (SFO), median preoptic nucleus (MnPO), and organum vasculosum lamina terminalis (OVLT), which are associated with the lamina terminalis, are important in the control of body fluid balance. Neurons in these regions express estrogen receptor (ER)-α, but whether the ER-α neurons are activated by hypertonicity and whether hypertonicity regulates ER-α expression are not known. Using fluorescent, double-label immunocytochemistry, we examined the expression of ER-α-immunoreactivity (ir) and Fos-ir in control and water-deprived male rats. In control animals, numerous ER-α-positive neurons were expressed in the periphery of the SFO, in both the dorsal and ventral MnPO, and in the dorsal cap of the OVLT. Fos-positive neurons were sparse in euhydrated rats but were numerous in the SFO, MnPO, and the dorsal cap of the OVLT after 48-h water deprivation. Most ER-α-ir neurons in these areas were positive for Fos, indicating a significant degree of colocalization. To examine the effect of dehydration on ER-α expression, animals with and without lesions surrounding the anterior and ventral portion of the 3rd ventricle (AV3V) were water deprived for 48 h. Water deprivation resulted in a moderate increase in ER-α-ir in the SFO of sham-lesioned rats ( P = 0.03) and a dramatic elevation in AV3V-lesioned animals ( P < 0.05). This was probably induced by the significant increase in plasma osmolality in both dehydrated groups ( P < 0.001) rather than a decrease in blood volume, because hematocrit was significantly increased only in the dehydrated sham-lesioned animals. Thus these studies implicate the osmosensitive regions of the lamina terminalis as possible targets for sex steroid effects on body fluid homeostasis." @default.
• W1978190003 created "2016-06-24" @default.
• W1978190003 creator A5011202431 @default.
• W1978190003 creator A5024136809 @default.
• W1978190003 creator A5055756006 @default.
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• W1978190003 date "2004-09-01" @default.
• W1978190003 modified "2023-10-17" @default.
• W1978190003 title "Estrogen receptor-α expression in osmosensitive elements of the lamina terminalis: regulation by hypertonicity" @default.
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• W1978190003 doi "https://doi.org/10.1152/ajpregu.00136.2004" @default.
• W1978190003 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15142833" @default.
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