Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
2010-6-15
pubmed:abstractText
CREB binding protein (CBP), a powerful transcriptional co-activator for various transcriptional factors, regulates cell behavior in many cell types. Angiotensin II (Ang II) contributes to vascular lesion by promoting vascular smooth muscle cells (VSMCs) proliferation and migration. Therefore, we examined whether CBP knockdown could suppress Ang II-induced VSMCs proliferation, and elucidated its underlying molecular mechanism. We constructed lentiviral vector expressing CBP-specific short hairpin RNAs (shRNAs) that efficiently silenced CBP. VSMCs proliferation was evaluated by bromodeoxyuridine (BrdU) incorporation assay. Protein and mRNA expression of CBP and relevant cytokines were examined by Western blot, ELISA, and real-time PCR, respectively. We also used luciferase reporter gene and electrophoretic mobility shift assay (EMSA) to detect Nuclear factor kappaB (NF-kB) transcriptional activity and DNA binding. Meanwhile, NF-kB p65 subunit nuclear translocation was confirmed by immunoblotting. Lentiviral-mediated CBP-shRNAs at different multiplicities of infection (MOI = 100, 150) both significantly suppressed Ang II-induced CBP expression. Knockdown of CBP markedly inhibited Ang II-stimulated VSMCs proliferation and cytokines (TNF-alpha and IL-6) production. However, this inhibitory effect was not enhanced at MOI of 150 compared with MOI of 100 (P > 0.05). CBP siRNA showed the potent inhibition on Ang II-induced NF-kB transcriptional activity. Similarly, no significant difference was found between CBP siRNA lentivirus treatment groups. Furthermore, CBP gene silencing had no effect on NF-kB nuclear translocation and DNA binding. These findings suggest that CBP knockdown inhibits Ang II-induced VSMCs proliferation and the mechanism is involved with downregulation of NF-kB transcriptional activity, not through reduction in NF-kB nuclear translocation or DNA binding. Maintaining proper CBP level may be a potential therapeutic target for Ang II-induced cardiovascular disorders.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
1573-4919
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
340
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
55-62
pubmed:meshHeading
pubmed-meshheading:20157765-Angiotensin II, pubmed-meshheading:20157765-Animals, pubmed-meshheading:20157765-Aorta, Thoracic, pubmed-meshheading:20157765-Blotting, Western, pubmed-meshheading:20157765-CREB-Binding Protein, pubmed-meshheading:20157765-Cell Proliferation, pubmed-meshheading:20157765-Cells, Cultured, pubmed-meshheading:20157765-Down-Regulation, pubmed-meshheading:20157765-Electrophoretic Mobility Shift Assay, pubmed-meshheading:20157765-Enzyme-Linked Immunosorbent Assay, pubmed-meshheading:20157765-Gene Knockdown Techniques, pubmed-meshheading:20157765-Genetic Vectors, pubmed-meshheading:20157765-Interleukin-6, pubmed-meshheading:20157765-Lentivirus, pubmed-meshheading:20157765-Male, pubmed-meshheading:20157765-Muscle, Smooth, Vascular, pubmed-meshheading:20157765-Myocytes, Smooth Muscle, pubmed-meshheading:20157765-NF-kappa B, pubmed-meshheading:20157765-Polymerase Chain Reaction, pubmed-meshheading:20157765-RNA, Messenger, pubmed-meshheading:20157765-RNA Interference, pubmed-meshheading:20157765-Rats, pubmed-meshheading:20157765-Rats, Sprague-Dawley, pubmed-meshheading:20157765-Transcription, Genetic, pubmed-meshheading:20157765-Transfection, pubmed-meshheading:20157765-Tumor Necrosis Factor-alpha
pubmed:year
2010
pubmed:articleTitle
CBP knockdown inhibits angiotensin II-induced vascular smooth muscle cells proliferation through downregulating NF-kB transcriptional activity.
pubmed:affiliation
Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't