Linked Life Data

9449647

Source:http://linkedlifedata.com/resource/pubmed/id/9449647

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1998-2-18
pubmed:abstractText
Transforming growth factors beta1 and beta2 (TGFbetas) have recently been detected by immunohistochemistry in the fetal and neonatal rat testis, and the aim of the present study was to determine whether these factors can act as local regulators to control the number of gonocytes. Testes were kept in organ culture, and TGFbeta1 was found to have dose-dependent inhibitory effect on the number of gonocytes in testes explanted on fetal day 13.5. Either TGFbeta1 or beta2 at 10 ng/ml reduced the number of gonocytes by half after 2 days culture. TGFbetas did not decrease the BrdU labeling index of gonocytes or Sertoli cells, whereas these factors significantly increased the DNA fragmentation in gonocytes (TUNEL method). The other testicular cell types showed no positive TUNEL reaction. TGFbeta1 did not reduce the number of gonocytes in testes explanted on fetal day 17.5 (i.e. during the quiescent phase), but it did so in testes explanted on postnatal day 3 (i.e. stage of resumption of mitosis). To determine the potential cell type targets for TGFbetas, type I and type II TGFbeta receptors were immunolocalized in developing testis from fetal day 13.5 to postnatal day 3. Both receptors were present in the gonocytes throughout the whole period studied, and in the Leydig cells from fetal day 16.5 onward, but they were not detected in the Sertoli cells. Taken together, these results suggest that TGFbetas directly increase apoptosis in gonocytes without changing their mitotic activity during the developmental phases of proliferation.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0013-7227
pubmed:author
pubmed:issnType
Print
pubmed:volume
139
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
733-40
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Transforming growth factor beta1 and beta2 reduce the number of gonocytes by increasing apoptosis.
pubmed:affiliation
INSERM-INRA U 418, Université Paris 7, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't