Identification Of Insulin In The Tear Film And Insulin Receptor And Igf-1 Receptor On The Human Ocular Surface.

dc.creatorRocha, Eduardo M
dc.creatorCunha, Daniel A
dc.creatorCarneiro, Everardo M
dc.creatorBoschero, Antonio C
dc.creatorSaad, Mário J A
dc.creatorVelloso, Lício A
dc.date2002-Apr
dc.date2015-11-27T12:49:34Z
dc.date2015-11-27T12:49:34Z
dc.date.accessioned2018-03-29T00:57:06Z
dc.date.available2018-03-29T00:57:06Z
dc.identifierInvestigative Ophthalmology & Visual Science. v. 43, n. 4, p. 963-7, 2002-Apr.
dc.identifier0146-0404
dc.identifier
dc.identifierhttp://www.ncbi.nlm.nih.gov/pubmed/11923235
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/195298
dc.identifier11923235
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1295531
dc.descriptionInsulin produces pleiotropic effects on sensitive tissues, including the ocular surface, through the tyrosine kinase insulin receptor. Cerebrospinal fluid and secreted fluids, such as milk and saliva, have been reported to contain insulin. In the present study, the presence of insulin was examined in tear film, and the expression of insulin and insulin-like growth factor (IGF)-1 receptor was examined in the human cornea and conjunctiva. Stimulated tear samples collected from 33 volunteers (17 men, 16 women), aged 23 to 51 years, who were fed or fasted for 12 hours, were assayed for total protein and insulin content by the biuret dye test and a radioimmunoassay, respectively. Frozen sections of human cornea (n = 4) and conjunctiva (n = 3) were incubated with anti-insulin receptor and anti-IGF-1 receptor antibodies and developed with a secondary antibody-peroxidase conjugate. Insulin was detected in all tear samples analyzed, the mean concentration being 0.404 +/- 0.129 ng/mL. There were no gender-related differences. In fed subjects, tears tended toward a higher insulin content than those in fasted individuals. There was no linear correlation between insulin and total protein content (mean, 4.61 +/- 0.79 mg/mL) in the tear film. Insulin and IGF-1 receptors were detected in the plasma membrane and cytoplasm of corneal and conjunctival epithelial cells. To the best of the authors' knowledge, this study represents the first demonstration of insulin in human tear film and the presence of insulin and IGF-1 receptor on the human ocular surface. These results suggest that the pancreatic hormone may play a metabolic and/or mitogenic role on the ocular surface.
dc.description43
dc.description963-7
dc.languageeng
dc.relationInvestigative Ophthalmology & Visual Science
dc.relationInvest. Ophthalmol. Vis. Sci.
dc.rightsfechado
dc.rights
dc.sourcePubMed
dc.subjectAdolescent
dc.subjectAdult
dc.subjectAged
dc.subjectConjunctiva
dc.subjectCornea
dc.subjectFemale
dc.subjectHumans
dc.subjectImmunoenzyme Techniques
dc.subjectInsulin
dc.subjectMale
dc.subjectMiddle Aged
dc.subjectProspective Studies
dc.subjectRadioimmunoassay
dc.subjectReceptor, Igf Type 1
dc.subjectReceptor, Insulin
dc.subjectTears
dc.titleIdentification Of Insulin In The Tear Film And Insulin Receptor And Igf-1 Receptor On The Human Ocular Surface.
dc.typeArtículos de revistas


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