Abstract：
:Progestin-concentrating neurons in the preoptic area and hypothalamus that project to the midbrain in the female rat were identified using the combined steroid hormone autoradiography-retrograde axonal tracing technique. Progesterone target neurons were most abundant in the periventricular preoptic area and the medial preoptic nucleus, and in the ventromedial and arcuate nuclei of the hypothalamus. In the medial preoptic area as a whole, about 14% of the progestin-concentrating cells were afferent to the midbrain. More specifically, 23% of medial preoptic nucleus progesterone target neurons communicated directly with midbrain cell groups, whereas a much smaller percentage (2%) of periventricular preoptic target neurons projected to the midbrain. In the medial basal hypothalamus as a whole, 11% of the progestin-concentrating cells detected sent axons to the midbrain. This proportion was slightly higher in the ventromedial nucleus (15%), and much lower in the arcuate nucleus (3%). In the dorsal and lateral hypothalamic areas, close to 30% of the progesterone target neurons sent axons to the midbrain, although the total number and density of target cells in the two latter areas was low. These data support the idea that transduction by forebrain target neurons of the progesterone signal into altered synaptic transmission in the midbrain is one route through which progesterone can influence a variety of behaviors.
journal_name
Brain Resjournal_title
Brain researchauthors
DonCarlos LL,Morrell JIdoi
10.1016/0006-8993(90)91545-rsubject
Has Abstractpub_date
1990-06-25 00:00:00pages
213-20issue
1-2eissn
0006-8993issn
1872-6240pii
0006-8993(90)91545-Rjournal_volume
521pub_type
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