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Type: Artigo de periódico
Title: Characterization Of The Insulin-signaling Pathway In Lacrimal And Salivary Glands Of Rats.
Author: Rocha, E M
de M Lima, M H
Carvalho, C R
Saad, M J
Velloso, L A
Abstract: Insulin has been acknowledged as a mediator of several physiological events in lacrimal and salivary glands. We investigated the presence of insulin receptors and of insulin-induced autophosphorylation of the insulin receptor and activation of elements involved in the early steps of insulin signaling in lacrimal and salivary glands of rats. Lacrimal and salivary glands of Wistar rats were removed and processed for immunohistochemistry using anti-insulin receptor and anti-IGF-1 receptor antibodies. The activation of insulin receptors following insulin treatment, and the involvement of insulin receptor substrates-1 and -2, Shc, JAK-2 and STAT-1, were analyzed by immunoprecipitation, followed by SDS-PAGE and immunoblotting of rat lacrimal and salivary glands after exposure to insulin. Insulin and IGF-1 receptors were present in rat lacrimal and salivary glands and were located predominantly in the cytoplasm and plasma membrane. Functional studies demonstrated that insulin induced a dose-dependent phosphorylation of the insulin receptor, IGF-1R, insulin receptor substrates-1 and -2, Shc, and STAT-1. In rats with streptozotocin-induced diabetes mellitus there was a significant reduction in insulin-induced insulin receptor and STAT-1 phosphorylation in the lacrimal gland but not in the salivary gland; there was no influence on Shc phosphorylation in either tissue. The present results indicate that insulin and IGF-1 receptors are expressed in lacrimal and salivary glands, and that insulin can induce the phosphorylation of its receptor and activate elements involved in the early steps of insulin signaling in both tissues.
Subject: Adaptor Proteins, Signal Transducing
Adaptor Proteins, Vesicular Transport
Dna-binding Proteins
Diabetes Mellitus, Experimental
Dose-response Relationship, Drug
Electrophoresis, Polyacrylamide Gel
Insulin Receptor Substrate Proteins
Intracellular Signaling Peptides And Proteins
Janus Kinase 2
Lacrimal Apparatus
Precipitin Tests
Protein-tyrosine Kinases
Proto-oncogene Proteins
Rats, Wistar
Receptor, Igf Type 1
Receptor, Insulin
Stat1 Transcription Factor
Salivary Glands
Shc Signaling Adaptor Proteins
Signal Transduction
Rights: fechado
Identifier DOI: 
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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