Linked Life Data

15921715

Source:http://linkedlifedata.com/resource/pubmed/id/15921715

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2005-12-5
pubmed:abstractText
Many synthetic chemicals, termed xenoestrogens, have been shown to interact as agonists with the estrogen receptor (ER) to elicit biological responses similar to those of natural hormones. To date, the regulation of vitellogenesis in oviparous vertebrates has been widely used for evaluation of estrogenic effects. Therefore, Carassius auratus juveniles were chosen as a fish model for studying the effects of estradiol-17beta and different concentrations (10(-6) and 10(-7) M) of 4-nonylphenol (4-NP) on the expression of liver ERbeta-1 subtype; plasma vitellogenin and sex steroids (androgens and estradiol-17beta) were also evaluated together with the bioaccumulation process, through mass-spectrometry. C. auratus is a species widespread in the aquatic environment and, on the toxicological point of view, can be considered a good "sentinel" species. Juveniles of goldfish were maintained in tanks with only tap water or water with different concentrations (10(-6) and 10(-7) M) of 4-nonylphenol (4-NP), or 10(-7) M of estradiol-17beta. After 3 weeks of treatment, animals were anesthetized within 5 min after capture, and blood was immediately collected into heparinized syringes by cardiac puncture and stored at -70 degrees C; the gonads were fixed, then frozen and stored at -70 degrees C; the whole fish, liver, and muscle tissues were harvested and immediately stored at -70 degrees C for molecular biology experiments and bioaccumulation measurements. The estrogenic effects of 4-NP were evidenced by the presence of plasma vitellogenin in juveniles exposed both to estradiol-17beta and the two doses of 4-NP; moreover, exposure to 4-NP also increased aromatization of androgens, as suggested by decreasing androgens and increasing estradiol-17beta plasma levels. The changes of these parameters were in agreement with the increasing transcriptional rate of ERbeta-1 mRNA in the liver, demonstrating that both estradiol-17beta and 4-NP modulate the vitellogenin rate through interaction with the ERbeta-1 subtype. The present study also suggests that 4-NP at the concentration of 10(-6) M bioaccumulates in the liver.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0041-008X
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
209
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
236-43
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Modulation of vitellogenin synthesis through estrogen receptor beta-1 in goldfish (Carassius auratus) juveniles exposed to 17-beta estradiol and nonylphenol.
pubmed:affiliation
Dipartimento di Medicina Sperimentale e Sanità Pubblica, Università degli Studi di Camerino, via Scalzino 3, 62032 Camerino, MC, Italy.
pubmed:publicationType
Journal Article, Comparative Study