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- W2034974784 abstract "High-performance liquid chromatography with electrochemical detection (HPLC-EC) and Palkovits' microdissection technique were used to measure norepinephrine (NE) concentrations in the medial preoptic area (MPA) and arcuate nucleus (AN) during various stages of the estrous cycle. NE was measured seven times at 2-h intervals between 1000 h and 2200 h on the days of proestrus and diestrus in young (4-month-old) rats and four times at 2-h intervals between 1400 h and 2000 h in old (20-22-month-old) persistently diestrous rats. On the day of proestrus in young animals, NE increased progressively from low levels at 1000 h to peak levels at 2000 h, followed by a sharp decline at 2200 h. In contrast, no changes in NE occurred on the day of diestrus. Unlike the young proestrous rats, but similar to the young diestrous rats, no changes in NE concentrations either in the MPA or in the AN occurred in the old persistently diestrous rats. These data demonstrate that NE concentrations in the MPA and AN change during the estrous cycle. We believe the increase in NE on the afternoon of proestrus is related to the surge in serum luteinizing hormone (LH) that occurs simultaneously in this stage of the estrous cycle. The lack of change in NE concentrations in the young diestrous and persistently diestrous old animals is consistent with the well-established absence of changes in serum LH in these animals." @default.
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- W2034974784 title "Cyclic and age-related changes in norepinephrine concentrations in the medial preoptic area and arcuate nucleus" @default.
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- W2034974784 doi "https://doi.org/10.1016/0361-9230(95)02031-4" @default.
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