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“Serum and follicular LH, pregnancy prediction and assisted reproduction”

100%
Severinski N., Milaković T., Mamula O., Krpina M.
Open Medicine
|
2011
|
vol. 6
|
issue 6
691-695
EN
The aim of this study was to determine the mean serum and follicular fluid LH and estradiol values in patients treated by IVF/ET (ICSI) after completed ovarian stimulation and to determine the range of values for these hormones with higher chances of conceiving pregnancies. All patients underwent stimulation in long agonistic protocol. Collected samples of body fluids (serum n = 31, follicular fluid n = 93) were centrifuged and supernatant was separated, aliquoted, frozen and stored at − 20°C. LH and E2 were measured in serum and follicular fluids. Cutoff value of E2 determined using follicular LH and follicular E2 correlation was 2100 nmol/L. If the E2 value was lower than 2100 nmol/L the ratio of results related to pregnancy was 29,4% (15/51). If the follicular E2 values were higher than 2100 nmol/L the ratio of results related to pregnancy was (7,1%, 3/42). The observed differences were significant (p 0.03). Follicular LH values higher than 3.1 IU/L and follicular E2 values < than 2100 nmol/L indicate higher conceiving probability. Our results can be fit in previous findings on negative effects of low LH values in IVF treatment procedures.
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Effective stimulation of daily LH secretion by the combined treatment with melatonin and naloxone in luteal-phase ewes

75%
Misztal T., Romanowicz K.
Acta Neurobiologiae Experimentalis
|
2005
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vol. 65
|
issue 1
1-9
EN
This study was designed to test the hypothesis that melatonin would intensify daily LH release after central blockade of the opiate receptors in sexually active ewes. The intracerebroventricular infusions of vehicle (control), melatonin, naloxone and melatonin in combination with naloxone were made in ewes in the luteal phase of the estrous cycle, from 2:00 P.M. to 5:00 P.M. Blood samples were collected from 11:00 A.M. to 8:00 P.M. at 10-min intervals. The mean plasma LH concentrations were measured before, during and after the infusions. The frequency and amplitude of LH pulses were determined during the whole experimental period. The LH concentrations recorded during melatonin or naloxone infusions were significantly higher than the concomitant concentration in vehicle-infused animals. The mean LH pulse amplitude in melatonin- and naloxone-treated ewes was also significantly higher than in controls. The LH concentration measured during the combined infusion of melatonin and naloxone was significantly higher than that during vehicle infusion. The LH concentration recorded in turn after the treatment was significantly higher than the concomitant concentrations in vehicle-, melatonin- and naloxone-infused animals. The mean LH pulse amplitude in this group was significantly higher than in the vehicle-infused group. These results indicate that blockade of the opiate receptors within the CNS facilitated effective stimulation of daily LH secretion by exogenous melatonin. In conclusion, a relationship between melatonin and endogenous opioid peptides may be crucial in enabling melatonin to exhibit stimulatory action on LH secretion during the luteal phase of the estrous cycle in ewes.
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