کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
319965 | 539643 | 2007 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The progesterone metabolite allopregnanolone potentiates GABAA receptor-mediated inhibition of 5-HT neuronal activity The progesterone metabolite allopregnanolone potentiates GABAA receptor-mediated inhibition of 5-HT neuronal activity](/preview/png/319965.png)
The dorsal raphe nucleus (DRN) is the origin of much of the 5-HT innervation of the forebrain. The activity of DRN 5-HT neurons is regulated by a number of receptors including GABAA and 5-HT1A inhibitory receptors and by excitatory α1-adrenoceptors. Using in vitro electrophysiological recording we investigated the action of progesterone and its metabolite, allopregnanolone on receptor-mediated responses of DRN 5-HT neurons. Neither allopregnanolone nor progesterone affected the α1-adrenoceptor agonist-induced firing. Allopregnanolone also had no effect on the inhibitory response to 5-HT. However, allopregnanolone significantly potentiated the inhibitory responses to GABAA receptor agonists. Progesterone did not enhance GABAA receptor-meditated inhibitory responses. Thus, the neuroactive metabolite of progesterone, allopregnanolone, has the ability to cause potentiation of GABAA-mediated inhibition of DRN 5-HT neurons. This effect on 5-HT neurotransmission may have relevance for mood disorders commonly associated with reproductive hormone events, such as premenstrual dysphoric disorder and postpartum depression.
Journal: European Neuropsychopharmacology - Volume 17, Issue 2, 15 January 2007, Pages 108–115