Attenuation of age-related metabolic dysfunction in mice with a targeted disruption of the Cbeta subunit of protein kinase A

The cyclic adenosine monophosphate-dependent protein kinase A (PKA) pathway helps regulate both cell growth and division, and triglyceride storage and metabolism in response to nutrient status. Studies in yeast show that disruption of this pathway promotes longevity in a manner similar to caloric re...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:The journals of gerontology. Series A, Biological sciences and medical sciences Biological sciences and medical sciences, 2009-12, Vol.64 (12), p.1221
Hauptverfasser: Enns, Linda C, Morton, John F, Mangalindan, Ruby Sue, McKnight, G Stanley, Schwartz, Michael W, Kaeberlein, Matt R, Kennedy, Brian K, Rabinovitch, Peter S, Ladiges, Warren C
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The cyclic adenosine monophosphate-dependent protein kinase A (PKA) pathway helps regulate both cell growth and division, and triglyceride storage and metabolism in response to nutrient status. Studies in yeast show that disruption of this pathway promotes longevity in a manner similar to caloric restriction. Because PKA is highly conserved, it can be studied in mammalian systems. This report describes the metabolic phenotype of mice lacking the PKA catalytic subunit Cbeta. We confirmed that Cbeta has high levels of expression in the brain but also showed moderate levels in liver. Cbeta-null animals had reduced basal PKA activity while appearing overtly normal when fed standard rodent chow. However, the absence of Cbeta protected mice from diet-induced obesity, steatosis, dyslipoproteinemia, and insulin resistance, without any differences in caloric intake or locomotor activity. These findings have relevant pharmacological implications because aging in mammals is characterized by metabolic decline associated with obesity, altered body fat distribution, and insulin resistance.
ISSN:1758-535X
DOI:10.1093/gerona/glp133