Linked Life Data

10336527

Source:http://linkedlifedata.com/resource/pubmed/id/10336527

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1999-6-15
pubmed:abstractText
In this study, we examined the presence of sigma1 and sigma2 sites in the rabbit iris-ciliary body by receptor binding and investigated their effects on intraocular pressure (IOP) in albino rabbits. The iris-ciliary body has binding sites for the sigma1-site agonist [3H](+)-pentazocine (Kd = 4.6 nM; Bmax = 212 fmol/mg protein) and sigma2 sites labeled with [3H]1,3-di-o-tolylguanidine (DTG) (Kd = 8. 2 nM; Bmax = 1120 fmol/mg protein). In competition binding studies, (+)-pentazocine and the sigma antagonist NE-100 displayed high affinity for sigma1 sites (Ki = 2.1 and 2.4 nM, respectively), whereas (+)-N-allylnormetazocine (NANM) was less potent (Ki = 178 nM). Unilateral topical (+)-pentazocine (0.01-0.1%) caused a significant dose-related reduction of IOP in ocular normotensive rabbits and in the alpha-chymotrypsin model of ocular hypertension. (+)-NANM was less potent than (+)-pentazocine. Neither compound altered the IOP of the contralateral eye, and their hypotensive activity was blocked by NE-100 that, by itself, had no effect on IOP. (-)-Pentazocine, (-)-NANM, and DTG had no effect on IOP. DTG prevented the hypotensive effect of (+)-pentazocine, suggesting that it acts as a sigma1-site antagonist. sigma-Site ligands did not affect pupil diameter or cause ocular inflammation. Topical [3H](+)-pentazocine reaches the intraocular tissues within 30 min, and its uptake in the iris-ciliary body and retina was significantly reduced by topical pretreatment with NE-100, as expected for a receptor-specific agent. Reverse-phase HPLC confirmed the presence of intact (+)-pentazocine in iris-ciliary body homogenates. sigma1-Site agonists may offer a novel class of agents potentially effective in the control of ocular hypertension.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0022-3565
pubmed:author
pubmed:issnType
Print
pubmed:volume
289
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1362-9
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:10336527-Animals, pubmed-meshheading:10336527-Anisoles, pubmed-meshheading:10336527-Antipsychotic Agents, pubmed-meshheading:10336527-Binding, Competitive, pubmed-meshheading:10336527-Cell Membrane, pubmed-meshheading:10336527-Ciliary Body, pubmed-meshheading:10336527-Functional Laterality, pubmed-meshheading:10336527-Guanidines, pubmed-meshheading:10336527-Intraocular Pressure, pubmed-meshheading:10336527-Iris, pubmed-meshheading:10336527-Kinetics, pubmed-meshheading:10336527-Lens, Crystalline, pubmed-meshheading:10336527-Male, pubmed-meshheading:10336527-Pentazocine, pubmed-meshheading:10336527-Phenazocine, pubmed-meshheading:10336527-Propylamines, pubmed-meshheading:10336527-Rabbits, pubmed-meshheading:10336527-Receptors, sigma, pubmed-meshheading:10336527-Retina, pubmed-meshheading:10336527-Tritium
pubmed:year
1999
pubmed:articleTitle
Sigma1 recognition sites in rabbit iris-ciliary body: topical sigma1-site agonists lower intraocular pressure.
pubmed:affiliation
Department of Pharmacology, University of Bologna, Bologna, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't