Linked Life Data

9578618

Source:http://linkedlifedata.com/resource/pubmed/id/9578618

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1998-6-11
pubmed:abstractText
During vertebrate development many types of precursor cells divide a limited number of times before they stop dividing and terminally differentiate. It is unclear what causes the cells to stop dividing when they do. We have been studying this problem in the oligodendrocyte cell lineage, which is responsible for myelination in the vertebrate central nervous system. Here we show for the first time that in clonal cultures of oligodendrocyte precursor cells purified from embryonic day 18 (E18) rat optic nerves the first oligodendrocytes develop within 3-4 days, equivalent to the time they first differentiate in the nerve, and that this timely differentiation depends on the presence of thyroid hormone. These findings suggest that a cell-intrinsic, thyroid-hormone-regulated timer determines when the first oligodendrocytes develop. Whereas the first oligodendrocytes develop asynchronously within clones, the vast majority develop after the first week in culture and do so more synchronously within clones. We show that beta1 thyroid hormone receptors in the precursor cells increase in clonal cultures in the absence of thyroid hormone in parallel with the increasing sensitivity of the cells to the cell-cycle-arresting activity of thyroid hormone; moreover, the increase in beta1 receptors, like the timer itself, is accelerated at 33 degrees C compared to 37 degrees C, suggesting that the increase in receptors may be part of the intrinsic timer. Finally, we show that the precursor cells do not divide indefinitely when stimulated to divide extensively in the absence of thyroid hormone but, instead, eventually stop dividing and either die or differentiate.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0012-1606
pubmed:author
pubmed:copyrightInfo
Copyright 1998 Academic Press.
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
197
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
54-66
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Cell-intrinsic timers and thyroid hormone regulate the probability of cell-cycle withdrawal and differentiation of oligodendrocyte precursor cells.
pubmed:affiliation
MRC Laboratory for Molecular Cell Biology and the Biology Department, University College London, London, WC1E 6BT, United Kingdom.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't