Impaired central insulin response in aged Wistar rats: role of adiposity.

Impaired central insulin response in aged Wistar rats: role of adiposity. Research Abstract Details 

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Impaired central insulin response in aged Wistar rats: role of adiposity. Abstract Text:

Miriam ,Teresa ,Alain J ,Antonio ,Carmen Arribas, Carrascosa,Manuel Ros,

Insulin, like leptin, is considered as a lipostatic signal acting at a central level. Aging and age-associated adiposity have been related to the development of leptin resistance in Wistar rats. In the present article, hypothalamic insulin response during aging has been studied in Wistar rats. Thus, the effects of intracerebroventricular infusion of insulin during a week on food intake and body weight as well as insulin signal transduction after acute intracerebroventricular insulin administration have been studied in 3-, 8-, and 24-month-old rats. To explore the possible role of age-associated adiposity, these experiments were also performed in 8- and 24-month-old rats after 3 months of food restriction to reduce visceral adiposity index to values below those of young animals. Intracerebroventricular administration of insulin during a week was more efficient at reducing food intake and body weight in 3-month-old rats than in 8- and 24-month-old rats. Hypothalamic insulin-stimulated insulin receptor, GSK3, AKT, and p70S6K phosphorylation decreased with aging. Insulin receptor and IRS-2 phosphoserine was increased in 24-month-old rats. Food restriction improved both insulin responsiveness and insulin signaling. These data suggest that Wistar rats develop hypothalamic insulin resistance with aging. This can be explained by alterations of the signal transduction pathway. The fact that food restriction improves central insulin response and signal transduction points to the age-associated adiposity as a key player in the development of central insulin resistance.

Impaired central insulin response in aged Wistar rats: role of adiposity. Publishing Authors By Initials

M ,T ,AJ ,A ,C Arribas,JM Carrascosa,M Ros,

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Impaired central insulin response in aged Wistar rats: role of adiposity. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Endocrinology

VOLUME: 148

Page Numbers: 5238-47

Journal Abbreviation: Endocrinology

ISSN: 0013-7227

DAY: 2

MONTH: 08

YEAR: 2007

Impaired central insulin response in aged Wistar rats: role of adiposity. Information

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LANGUAGE: eng

NlmUniqueID: 375040

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Grant and Affiliation Information for Impaired central insulin response in aged Wistar rats: role of adiposity.

AFFILIATION: Facultad de Ciencias de la Salud, Universidad Rey Juan Carlos, Avda Atenas s/n, Alcorcón, 28922, Madrid, Spain.

Country: United States

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MEDLINETA: Endocrinology

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