Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/73462
Type: Artigo de periódico
Title: The influence of ageing on the insulin signalling system in rat lacrimal and salivary glands
Author: Rocha, EM
Carvalho, CRO
Saad, MJA
Velloso, LA
Abstract: Purpose: Ageing adversely affects the structure and function of lacrimal and salivary glands (LG and SG) and leads to marked insulin resistance that correlates with reduced insulin signal transduction. The aim of this study was to investigate whether ageing affects insulin signal transduction in LG and SG in vivo. Methods: Male Wistar rats aged 20 months and 2 months (control group) were compared (n = 8/group). Samples were removed under anaesthesia after i.v. injection of insulin, homogenized, immunoprecipitated with anti-insulin receptor (IR), Shc and STAT-1 antibodies and immunoblotted with antiphosphotyrosine antibody. Results: The 20-month-old rats were significantly hyperinsulinaemic and presented a reduced rate of blood glucose disappearance in response to insulin, compared to the 2-month-old rats. The level of phosphorylation determined by densitometry in the older group of rats showed that ageing significantly reduced insulin-induced IR phosphorylation in LG and SG and STAT-1 phosphorylation in SG, compared to in the control group, but did not alter Shc phosphorylation. Conclusions: Ageing influences insulin signal transduction in the LG and SG of rats. Considering the major anabolic actions of insulin, these observations may help to explain the mechanisms of LG and SG dysfunctions observed in ageing.
Subject: ageing
insulin receptor
lacrimal gland
salivary gland
tyrosine kinase
Country: Dinamarca
Editor: Blackwell Munksgaard
Rights: fechado
Identifier DOI: 10.1046/j.1600-0420.2003.00162.x
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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