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• W1981353066 abstract "It has been suggested that norepinephrine (NE) from the locus coeruleus (LC) plays an important role in triggering the preovulatory surge of gonadotropins. This work intended to study the role of LC in luteinizing hormone (LH) secretion during the estrous cycle and in ovariectomized rats treated with estradiol and progesterone (OVXE(2)P) and to correlate it with LH releasing hormone (LHRH) content in the medial preoptic area (MPOA) and median eminence (ME). Female rats on each day of the estrous cycle and OVXE(2)P were submitted to jugular cannulation and LC electrolytic lesion or sham-operation, at 09:00 h. Blood samples were collected hourly from 11:00 to 18:00 h, when animals were decapitated and their brains removed to analyze LC lesion and punch out the MPOA and ME. Plasma LH levels and LHRH content of MPOA and ME were determined by radioimmunoassay. During metestrus, diestrus and estrus, LC lesion did not modify either LH plasma concentrations or LHRH content, but completely abolished the preovulatory LH surge during proestrus and the surge of OVXE(2)P. These blockades were accompanied by an increased content of LHRH in the MPOA and ME. The results suggest that: (1). LC does not participate in the control of basal LH secretion but its activation is essential to trigger spontaneous or induced LH surges, and (2). the increased content of LHRH in the MPOA and ME may be due to a decreased NE input to these areas. Thus, LC activation may be required for depolarization of LHRH neurons and consequent LH surges." @default.
• W1981353066 created "2016-06-24" @default.
• W1981353066 creator A5001767441 @default.
• W1981353066 creator A5052146696 @default.
• W1981353066 creator A5074863251 @default.
• W1981353066 date "2002-11-01" @default.
• W1981353066 modified "2023-09-27" @default.
• W1981353066 title "Luteinizing hormone and luteinizing hormone-releasing hormone secretion is under locus coeruleus control in female rats" @default.
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• W1981353066 doi "https://doi.org/10.1016/s0006-8993(02)03471-6" @default.
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