Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2005-9-2
pubmed:abstractText
In rodents, females but not males, in response to escalating levels of estrogen, express a luteinizing hormone (LH) surge that is prompted by a surge in luteinizing hormone-releasing hormone (LHRH). It cannot take place if estrogen-sensitive afferents located in the anteroventral periventricular nucleus (AVPV) are either absent or disabled. Males appear to lack the ability to exhibit an LH surge, but it is unclear what level of the CNS contributes to this dimorphic response. This study was conducted to determine whether estrogen followed by progesterone treatment (E + P) of gonadectomized males evokes Fos activation in LHRH and AVPV neurons as it does in females. The results indicated that, consistent with the males' inability to express an LH surge in response to E + P treatment, LHRH and AVPV neurons in males failed to show increased Fos activation. Examination of neuron nuclear antigen (NeuN, a neuron-specific marker), estrogen receptor (ERalpha) and progesterone receptor (PR) neurons in AVPV neurons indicated that, while essentially all the neurons of the caudal AVPV in males and females are steroid responsive, the male possessed half the number of steroid responsive neurons within the caudal AVPV (where activation of Fos is maximal in females) compared to the female. Together, these data indicate that the male lacks a substantial population of steroid receptive AVPV neurons and is unable to respond to the presence of E and P and activate either AVPV or LHRH neurons.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0006-8993
pubmed:author
pubmed:issnType
Print
pubmed:day
30
pubmed:volume
1054
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
116-24
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed-meshheading:16084918-Analysis of Variance, pubmed-meshheading:16084918-Animals, pubmed-meshheading:16084918-Cell Count, pubmed-meshheading:16084918-Cerebral Ventricles, pubmed-meshheading:16084918-Estrogens, pubmed-meshheading:16084918-Female, pubmed-meshheading:16084918-Gene Expression Regulation, pubmed-meshheading:16084918-Gonadotropin-Releasing Hormone, pubmed-meshheading:16084918-Immunohistochemistry, pubmed-meshheading:16084918-Luteinizing Hormone, pubmed-meshheading:16084918-Male, pubmed-meshheading:16084918-Neurons, pubmed-meshheading:16084918-Oncogene Proteins v-fos, pubmed-meshheading:16084918-Preoptic Area, pubmed-meshheading:16084918-Progesterone, pubmed-meshheading:16084918-Radioimmunoassay, pubmed-meshheading:16084918-Rats, pubmed-meshheading:16084918-Rats, Sprague-Dawley, pubmed-meshheading:16084918-Sex Factors
pubmed:year
2005
pubmed:articleTitle
Estrogen and progesterone do not activate Fos in AVPV or LHRH neurons in male rats.
pubmed:affiliation
Department of Anatomy and Neurobiology, University of Maryland, School of Medicine, 685 W Baltimore Street, Baltimore, MD 21201, USA. gehoffma@umaryland.edu
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, N.I.H., Extramural