Linked Life Data

17431219

Source:http://linkedlifedata.com/resource/pubmed/id/17431219

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2007-7-6
pubmed:abstractText
Reduced colonic motility has been observed in aged rats with a parallel reduction in acetylcholine (ACh)-induced myosin light chain (MLC(20)) phosphorylation. MLC(20) phosphorylation during smooth muscle contraction is maintained by a coordinated signal transduction cascade requiring both PKC-alpha and RhoA. Caveolae are membrane microdomains that permit rapid and efficient coordination of different signal transduction cascades leading to sustained smooth muscle contraction of the colon. Here, we show that normal physiological contraction can be reinstated in aged colonic smooth muscle cells (CSMCs) upon transfection with wild-type caveolin-1 through the activation of both the RhoA/Rho kinase and PKC pathways. Our data demonstrate that impaired contraction in aging is an outcome of altered membrane translocation of PKC-alpha and RhoA with a concomitant reduction in the association of these molecules with the caveolae-specific protein caveolin-1, resulting in a parallel decrease in the myosin phosphatase-targeting subunit (MYPT) and CPI-17 phosphorylation. Decreased MYPT and CPI-17 phosphorylation activates MLC phosphatase activity, resulting in MLC(20) dephosphorylation, which may be responsible for decreased colonic motility in aged rats. Importantly, transfection of CSMCs from aged rats with wild-type yellow fluorescent protein-caveolin-1 cDNA restored translocation of RhoA and PKC-alpha and phosphorylation of MYPT, CPI-17, and MLC(20), thereby restoring the contractile response to levels comparable with young adult rats. Thus, we propose that caveolin-1 gene transfer may represent a promising therapeutic treatment to correct the age-related decline in colonic smooth muscle motility.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0193-1857
pubmed:author
pubmed:issnType
Print
pubmed:volume
293
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
G240-9
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed-meshheading:17431219-Acetylcholine, pubmed-meshheading:17431219-Aging, pubmed-meshheading:17431219-Animals, pubmed-meshheading:17431219-Caveolin 1, pubmed-meshheading:17431219-Cells, Cultured, pubmed-meshheading:17431219-Colon, pubmed-meshheading:17431219-Gastrointestinal Motility, pubmed-meshheading:17431219-Intracellular Signaling Peptides and Proteins, pubmed-meshheading:17431219-Muscle, Smooth, pubmed-meshheading:17431219-Muscle Contraction, pubmed-meshheading:17431219-Myosin Light Chains, pubmed-meshheading:17431219-Protein Kinase C-alpha, pubmed-meshheading:17431219-Protein-Serine-Threonine Kinases, pubmed-meshheading:17431219-Rats, pubmed-meshheading:17431219-Transfection, pubmed-meshheading:17431219-rho-Associated Kinases, pubmed-meshheading:17431219-rhoA GTP-Binding Protein
pubmed:year
2007
pubmed:articleTitle
Ectopic expression of caveolin-1 restores physiological contractile response of aged colonic smooth muscle.
pubmed:affiliation
University of Michigan Medical School, 1150 W. Medical Center Drive, Ann Arbor, MI 48109-0658, USA.
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural