Linked Life Data

2410243

Source:http://linkedlifedata.com/resource/pubmed/id/2410243

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1985-9-19
pubmed:abstractText
We have used cultured 3T3-L1 adipocytes to assess direct effects of T3 on beta-adrenergic-mediated regulation of lipolysis and adenylate cyclase and phosphodiesterase activities. Differentiated 3T3-L1 adipocytes were maintained under four conditions: in the presence of medium containing serum from a hypothyroid calf (hypothyroid medium), hypothyroid medium supplemented with T3 (T3-supplemented hypothyroid medium), medium with serum from a normal calf (control medium), and control medium supplemented with excess T3 (hyperthyroid medium). Compared to the two control groups, i.e. cells maintained in control medium or T3-supplemented hypothyroid medium, cells maintained in hypothyroid medium exhibited lower basal rates of lipolysis and lower sensitivity to isoproterenol. Hyperthyroid cells exhibited higher basal rates of lipolysis and higher sensitivity to isoproterenol. In the presence of maximally effective concentrations of isoproterenol, rates of lipolysis were similar in the four groups. Similarly, basal cAMP content and cAMP accumulation in the presence of isoproterenol were reduced in hypothyroid and increased in hyperthyroid adipocytes compared to those adipocytes maintained in control or T3-supplemented hypothyroid medium. Basal adenylate cyclase activity was similar in the four groups. Sensitivity to isoproterenol and maximal isoproterenol-stimulated cyclase activity were diminished in membrane preparations from hypothyroid adipocytes and increased in preparations from hyperthyroid adipocytes. Cyclase activity in the presence of NaF, however, was similar in preparations from cells maintained in hypothyroid, T3-supplemental hypothyroid, or control medium. NaF-stimulated activity was increased in preparations from hyperthyroid adipocytes. Thyroid status did not affect beta-receptor number of affinity for iodohydroxybenzylpindolol. Compared to control cells or cells maintained in T3-supplemented hypothyroid medium, both soluble and particulate cAMP phosphodiesterase activities were increased in hypothyroid cells and decreased in hyperthyroid cells. These results indicated that in 3T3-L1 adipocytes, some of the effects of thyroid hormone on cAMP content and lipolysis can be explained by alterations in both production and degradation of cAMP.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0013-7227
pubmed:author
pubmed:issnType
Print
pubmed:volume
117
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
947-53
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1985
pubmed:articleTitle
Effects of thyroid hormone on regulation of lipolysis and adenosine 3',5'-monophosphate metabolism in 3T3-L1 adipocytes.
pubmed:publicationType
Journal Article