Linked Life Data

9145236

Source:http://linkedlifedata.com/resource/pubmed/id/9145236

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1997-7-18
pubmed:abstractText
Signaling pathways mediated by tyrosine phosphorylation and dephosphorylation have been reported to be involved in the regulation of cytoskeletal organization in osteoclasts, the principal cells responsible for bone resorption. We examined the effects of tiludronate [(4-chlorophenyl)thiomethylene bisphosphonate] on the cytoskeleton and the balance of phosphotyrosine levels in osteoclast-like multinucleated cells (OCLs) formed in cocultures of mouse osteoblastic cells and bone marrow cells. When OCLs were placed on plastic dishes in the presence of 10% fetal bovine serum, they formed a ringed structure of F-actin dots (actin ring) within 2 h. Tiludronate did not inhibit the process of actin ring formation, but it disrupted preformed actin rings in a time- and a dose-dependent manner. Western blot analysis using an antiphosphotyrosine antibody revealed that tyrosine phosphorylation of certain proteins in OCLs was stimulated by tiludronate added to the purified OCLs. Tyrosine kinase activity of the p60c-src immunoprecipitated from cell lysates of the purified OCLs was not affected by tiludronate directly added to the kinase assay. OCL lysates stimulated dephosphorylation of tyrosine-phosphorylated substrates such as phosphoneuroprotein 14 and epidermal growth factor receptors. Like sodium orthovanadate, an inhibitor of protein tyrosine phosphatases, tiludronate dose-dependently inhibited tyrosine dephosphorylation of those substrates induced by OCL lysates. These findings suggest that tiludronate disrupts the preformed actin rings and suppresses bone-resorbing activity by inhibiting protein tyrosine phosphatases in osteoclasts.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
8756-3282
pubmed:author
pubmed:issnType
Print
pubmed:volume
20
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
399-404
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Tiludronate inhibits protein tyrosine phosphatase activity in osteoclasts.
pubmed:affiliation
Department of Biochemistry, School of Dentistry, Showa University, Tokyo, Japan.
pubmed:publicationType
Journal Article