Linked Life Data

18688043

Source:http://linkedlifedata.com/resource/pubmed/id/18688043

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2008-9-17
pubmed:abstractText
Sphingosylphosphorylcholine (SPC) induces differentiation of human adipose tissue-derived mesenchymal stem cells (hADSCs) to smooth muscle cells (SMCs). In the present study, we characterized contractile and ion channel properties of SMCs differentiated from hADSCs (hADSC-SMCs) as a result of SPC treatment, and we investigated the molecular mechanisms involved in the SPC-induced differentiation. Using in vitro collagen gel lattice contraction and whole cell patch clamp, we showed that the hADSC-SMCs expressed functional L-type voltage-gated Ca2+ channels and contractile activities in response to KCl, carbachol, and the L-type Ca2+ channel opener Bay K8644, whereas the L-type Ca2+ channel blocker nifedipine abrogated the contractility of hADSC-SMCs. Furthermore, hADSC-SMCs expressed functional big conductance Ca2+-activated K+ (BK(Ca)) channels, and the BK(Ca) channel blocker iberiotoxin potentiated the Bay K8644-stimulated contractility of the hADSC-SMCs, indicating that these cells exhibited SMC-like contractile characteristics. SPC activated RhoA in hADSCs and pretreatment with the Rho kinase inhibitor Y27632 or by overexpression of dominant-negative mutants of RhoA or Rho kinase completely abrogated the SPC-induced differentiation of hADSCs into SMCs. SPC also increased the expression levels of myocardin-related transcription factor (MRTF)-A, a transcription factor involved in smooth muscle differentiation, in hADSCs. Small interference RNA-mediated depletion of endogenous MRTF-A abolished the SPC-induced differentiation of hADSCs into SMCs. Furthermore, SPC promoted nuclear translocation of MRTF-A, and pharmacological inhibition of Rho kinase blocked this effect. These results suggest that SPC induced differentiation of hADSCs into contractile SMCs through a mechanism involving RhoA/Rho kinase-dependent nuclear translocation of MRTF-A.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
1524-4571
pubmed:author
pubmed:issnType
Electronic
pubmed:day
12
pubmed:volume
103
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
635-42
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
A Rho kinase/myocardin-related transcription factor-A-dependent mechanism underlies the sphingosylphosphorylcholine-induced differentiation of mesenchymal stem cells into contractile smooth muscle cells.
pubmed:affiliation
Department of Physiology, Pusan National University College of Medicine, Busan 602-739, Republic of Korea.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't