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• W2132372976 abstract "GnRH is present in the hypophyseal portal blood and cerebrospinal fluid (CSF) of several species investigated, including sheep, but the precise relationship between these two compartments of GnRH is unknown. In the present study, ovariectomized steroid-treated ewes were surgically prepared for the simultaneous collection of portal blood and third ventricular CSF. Ten-minute samples were collected for pulse analysis after progesterone removal and hourly for comparisons during the estradiol-induced LH surge. The time of onset of the portal (15.3 ± 0.5 h after estradiol) and CSF (15.9 ± 0.2 h) GnRH surges was similar and occurred coincidentally with the LH surge (15.6 ± 0.4 h). The period of the surge during which GnRH concentrations exceeded half-maximal levels (portal, 7.3 ± 1.5 h; CSF, 7.3 ± 0.3 h) was the same and outlasted the corresponding LH surge period (3.3 ± 0.3 h). LH pulses started and peaked later than the corresponding portal GnRH pulses (onset difference, 10 ± 1 min; peak difference, 16 ± 1 min; P < 0.01 for both), but the times of pulse onset and peak were not significantly different from those of concomitant CSF GnRH pulses (onset difference, 8 ± 6 min; peak difference, 8 ± 4 min). Although the times of pulse onset and peak did not differ between the portal and CSF GnRH compartments (onset difference, 4 ± 6 min; peak difference, 6 ± 2 min), CSF GnRH pulses were longer than their portal counterparts (CSF, 38 ± 3 min; portal, 15 ± 1 min; P < 0.01). The amplitude of jugular LH pulses was strongly correlated (r2= 0.85) with portal GnRH pulse amplitude, but not with that of CSF GnRH pulses (r2 = 0.45); there was no correlation between portal and CSF GnRH pulse amplitudes (r2 = 0.25). These data show that third ventricular CSF GnRH reliably relates neurosecretory events occurring within the hypophyseal portal system at the time of the preovulatory LH surge, but is not as precise as portal GnRH in marking a LH pulse." @default.
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• W2132372976 date "1997-11-01" @default.
• W2132372976 modified "2023-09-23" @default.
• W2132372976 title "Simultaneous Measurement of Gonadotropin-Releasing Hormone in the Third Ventricular Cerebrospinal Fluid and Hypophyseal Portal Blood of the Ewe" @default.
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• W2132372976 doi "https://doi.org/10.1210/endo.138.11.5494" @default.
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