Linked Life Data

15056816

Source:http://linkedlifedata.com/resource/pubmed/id/15056816

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2004-5-20
pubmed:abstractText
2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) inhibits the androgen-dependent processes by which the urogenital sinus (UGS) of fetal mice forms prostatic epithelial buds. This inhibition is mediated by aryl hydrocarbon receptors in UGS mesenchyme and causes prostate lobes to develop abnormally. Experiments were conducted to test the hypothesis that TCDD inhibits prostatic budding in C57BL/6J mice by inhibiting androgen signaling. In utero TCDD exposure sufficient to inhibit budding (5 microg/kg maternal dose on gestation day [GD] 13) had no effect on testicular testosterone content on GD 16 or 18. Nor did it inhibit the conversion of testosterone to 5alpha-dihydrotestosterone (DHT) by the UGS. Both hydroxyflutamide (OH-flutamide; a competitive androgen receptor antagonist) and TCDD inhibited prostatic epithelial budding by UGSs cultured in vitro with DHT. To determine if TCDD inhibits responsiveness to androgens, primary mesenchymal cells prepared from UGSs cultured for three days with DHT were transiently transfected with an androgen-responsive reporter plasmid (MMTV-luciferase). OH-flutamide prevented DHT from increasing luciferase activity in these cells but TCDD did not. The same results were obtained when the mesenchymal cells were isolated from UGSs cultured with both DHT and TCDD. The lack of effect of TCDD on androgen-dependent gene expression was not due to inability of transfected UGS mesenchymal cells to respond to TCDD, as shown by significant increases in luciferase activity after transfection with plasmids containing CYP1A1 and CYP1B1 promoters. Finally, while OH-flutamide prevented DHT from altering androgen receptor and 5alpha-reductase type II mRNA expression in UGS organ culture, TCDD had no such effects. Collectively, these results suggest that TCDD inhibits prostatic epithelial bud formation without impairing the androgen receptor signaling pathway.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1096-6080
pubmed:author
pubmed:issnType
Print
pubmed:volume
79
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
360-9
pubmed:dateRevised
2010-9-17
pubmed:meshHeading
pubmed-meshheading:15056816-Androgen Antagonists, pubmed-meshheading:15056816-Animals, pubmed-meshheading:15056816-Cells, Cultured, pubmed-meshheading:15056816-Dihydrotestosterone, pubmed-meshheading:15056816-Environmental Pollutants, pubmed-meshheading:15056816-Epithelium, pubmed-meshheading:15056816-Female, pubmed-meshheading:15056816-Fetus, pubmed-meshheading:15056816-Flutamide, pubmed-meshheading:15056816-Gene Expression Regulation, Developmental, pubmed-meshheading:15056816-Luciferases, pubmed-meshheading:15056816-Male, pubmed-meshheading:15056816-Maternal Exposure, pubmed-meshheading:15056816-Mesoderm, pubmed-meshheading:15056816-Mice, pubmed-meshheading:15056816-Mice, Inbred C57BL, pubmed-meshheading:15056816-Pregnancy, pubmed-meshheading:15056816-Prostate, pubmed-meshheading:15056816-Receptors, Androgen, pubmed-meshheading:15056816-Testis, pubmed-meshheading:15056816-Testosterone, pubmed-meshheading:15056816-Tetrachlorodibenzodioxin, pubmed-meshheading:15056816-Urogenital System
pubmed:year
2004
pubmed:articleTitle
Evidence that inhibited prostatic epithelial bud formation in 2,3,7,8-tetrachlorodibenzo-p-dioxin-exposed C57BL/6J fetal mice is not due to interruption of androgen signaling in the urogenital sinus.
pubmed:affiliation
Endocrinology-Reproductive Physiology Program, University of Wisconsin, Madison, Wisconsin 53705, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.