Linked Life Data

11846994

Source:http://linkedlifedata.com/resource/pubmed/id/11846994

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2002-2-15
pubmed:abstractText
Oxidative stress induces cellular apoptosis. Many agents producing intracellular oxidative stress, including H(2)O(2) and steroid hormones, have also been found to induce metallothionein (MT) expression. Recently, MT has been recognized as potentially having antioxidant activity. This action may be essential for survival of terminally differentiated cells subject to oxidative stress, such as syncytiotrophoblasts, placental cells producing pregnancy hormones and forming the maternal-fetal barrier. We previously demonstrated an inverse relationship between basal MT expression and apoptotic incidence in the trophoblastic cell line, JEG-3. Using JEG-3 cells transfected with MT in sense or antisense orientation, we have examined here the effect of altered basal MT levels on trophoblastic function and apoptosis following treatment with H(2)O(2) or diethylstilbestrol (DES). Induction of MT mRNA was observed in control and transfected JEG-3 cells following exposure to severe oxidative stress. Changes in the localization of MT protein, however, were apparent after a low oxidative stress challenge. Exposure to H(2)O(2) resulted in a dose-dependent decrease in human chorionic gonadotropin secretion in all JEG-3 cultures regardless of basal MT expression, whereas no change was detected following DES treatment. With respect to apoptosis, a significant protective effect was observed proportional to the basal MT level. These results suggest that although MT does not ameliorate oxidative stress-induced perturbation of some trophoblastic functions, its expression is critical for protection of these cells from severe oxidative stress-induced apoptosis. MT thus appears to act as an anti-apoptotic antioxidant in trophoblastic cells.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1097-9336
pubmed:author
pubmed:issnType
Print
pubmed:volume
14
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
219-31
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Metallothionein protects against severe oxidative stress-induced apoptosis of human trophoblastic cells.
pubmed:affiliation
Department of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, PA 19107, USA.
pubmed:publicationType
Journal Article, In Vitro, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't