Linked Life Data

16095628

Source:http://linkedlifedata.com/resource/pubmed/id/16095628

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
2005-11-4
pubmed:abstractText
Cyclic-ADP-ribose (cADPR) has been reported to serve as a second messenger to mobilize intracellular Ca2+ independent of IP3 in a variety of mammalian cells. This cADPR-mediated Ca2+ signaling pathway importantly participates in the regulation of various cell functions. The present study determined the role of endogenous cADPR in mediating ryanodine-sensitive Ca2+-induced Ca2+ release (CICR) in vascular myocytes from small renal arteries and vasomotor response of these arteries. In freshly-isolated renal arterial myocytes, addition of CaCl2 (0.01, 0.1, and 1 mM) into the Ca2+-free bath solution produced a rapid Ca2+ release response from the sarcoplasmic reticulum (SR), with a maximal increase of 237+/-25 nM at 1 mM CaCl2. This CaCl2 response was significantly blocked by a cell-membrane permeant cADPR antagonist, 8-bromo-cADP-ribose (8-br-cADPR) (30 microM) or ryanodine (50 microM). Caffeine, a classical CICR or ryanodine receptor activator was found to stimulate the SR Ca2+ release (Delta[Ca2+]i: 253+/-35 nM), which was also attenuated by 8-br-cADPR or ryanodine. Using isolated and pressurized small renal arteries bathed with Ca2+-free solution, both CaCl2 and caffeine-induced vasoconstrictions were significantly attenuated by either 8-br-cADPR or ryanodine. Biochemical analyses demonstrated that CaCl2 and caffeine did not increase cADPR production in these renal arterial myocytes, but confocal microscopy showed that a dissociation of the accessory protein, FK506 binding protein 12.6 (FKBP12.6) from ryanodine receptors was induced by CaCl2. We conclude that cADPR importantly contributes to CICR and vasomotor responses of small renal arteries through enhanced dissociation of ryanodine receptors from their accessory protein.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0026-2862
pubmed:author
pubmed:issnType
Print
pubmed:volume
70
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
65-75
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed-meshheading:16095628-Animals, pubmed-meshheading:16095628-Caffeine, pubmed-meshheading:16095628-Calcium, pubmed-meshheading:16095628-Calcium Signaling, pubmed-meshheading:16095628-Cyclic ADP-Ribose, pubmed-meshheading:16095628-Dose-Response Relationship, Drug, pubmed-meshheading:16095628-Male, pubmed-meshheading:16095628-Microscopy, Confocal, pubmed-meshheading:16095628-Muscle, Smooth, Vascular, pubmed-meshheading:16095628-Myocytes, Smooth Muscle, pubmed-meshheading:16095628-Rats, pubmed-meshheading:16095628-Rats, Sprague-Dawley, pubmed-meshheading:16095628-Renal Artery, pubmed-meshheading:16095628-Ryanodine, pubmed-meshheading:16095628-Ryanodine Receptor Calcium Release Channel, pubmed-meshheading:16095628-Sarcoplasmic Reticulum, pubmed-meshheading:16095628-Second Messenger Systems, pubmed-meshheading:16095628-Tacrolimus Binding Proteins, pubmed-meshheading:16095628-Vasoconstriction
pubmed:year
2005
pubmed:articleTitle
Role of cyclic ADP-ribose in Ca2+-induced Ca2+ release and vasoconstriction in small renal arteries.
pubmed:affiliation
Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI 53226, USA.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, N.I.H., Extramural