During the oestrus cycle, varying spine synapse density correlates positively with varying local synthesis of oestradiol in the hippocampus. In this context, the roles of the oestrogen receptor (ER) subtypes ERα and β are not fully understood. In the present study, we used neonatal hippocampal slice cultures from female rats because these cultures synthesise oestradiol and express both receptor subtypes, and inhibition of oestradiol synthesis in these cultures results in spine synapse loss. Using electron microscopy, we tested the effects on spine synapse density in response to agonists of both ERα and ERβ. Application of agonists to the cultures had no effect. After inhibition of oestradiol synthesis, however, agonists of ERα induced spine synapse formation, whereas ERβ agonists led to a reduction in spine synapse density in the CA1 region of these cultures. Consistently, up-regulation of ERβ in the hippocampus of adult female aromatase-deficient mice is paralleled by hippocampus-specific spine synapse loss in this mutant. Finally, we found an increase in spine synapses in the adult female ERβ knockout mouse, but no effect in the adult female ERα knockout mouse. Our data suggest antagonistic roles of ERβ and ERα in spine synapse formation in the female hippocampus, which may contribute to oestrus cyclicity of spine synapse density in the hippocampus.

Background: The aim was to assess the effect of vasopressin in reducing the time of surgery, amount of bleeding, and fluid deficit during hysteroscopic myomectomy of submucosal myoma from 2016 to 2018. Materials and methods: This study was conducted as a prospective, randomized, single-blinded clinical trial on the premenopausal women ranged from 18 to 62 years' old. A number of 80 patients were randomly assigned to each arm of the study according to random consecutive numbers. The control group ( n = 40) of patients underwent conventional hysteroscopic myomectomy without vasopressin and the case group ( n = 40) underwent hysteroscopic myomectomy with the injection of diluted vasopressin. Measured outcomes were time for myomectomy, fluid deficit, inflow volume, visual clarity, and postoperation hemoglobin level. Results: The mean time of myomectomy was 38.1 and 77.38 min in vasopressin and control groups, respectively ( P < 0.001). The mean inflow volume was 2800 and 4100 in vasopressin and control groups, respectively ( P = 0.029). The visual clarity score was 8.5 and 6.5 in the vasopressin and control groups, respectively ( P < 0.001). Conclusions: The injection of vasopressin during hysteroscopic myomectomy is effective in the management of fluid deficit, time of surgery, and improvement of visual clarity.