Biogerontology

, Volume 9, Issue 1, pp 33–47 | Cite as

The activation of NF-κB through Akt-induced FOXO1 phosphorylation during aging and its modulation by calorie restriction

  • Dae Hyun Kim
  • Ji Young Kim
  • Byung Pal Yu
  • Hae Young Chung
Research Article

Abstract

Insulin-induced PI3K/Akt activation is known to inhibit a family of Forkhead transcription factors (FOXO), which can lead to increased oxidative stress in several model organisms. One of major transcription factors activated by oxidative stress and responsible for the production of many proinflammatory cytokines is NF-κB. In the present study, We were carried out to determine the relationship between FOXO1 and NF-κB activation using HEK293T cells and aged kidney isolated from ad libitum fed (AL) and 40% calorie restriction (CR) rats. Results showed that phosphorylation of FOXO1 and NF-κB activation were significantly increased in old rats. Moreover, FOXO1 phosphorylation and NF-κB activation were shown to be significantly lower in the CR rats compared with 24–month-old AL rats. To further explore the molecular link between FOXO and NF-κB, we performed transfection experiments with FOXO-mutant plasmid in cultured HEK293T cells. Treatment of the cell with insulin led to NF-κB activation through the phosphorylation of FOXO via the PI3K/Akt pathway. These results indicate that insulin promoted NF-κB activation through phosphorylation of FOXO1 by upregulating PI3K/Akt signaling. We conclude that the phosphorylation of FOXO1 regulates NF-κB nuclear translocation by activating PI3K/Akt during aging, which was suppressed by the hypoinsulinemic action of CR.

Keywords

Insulin FOXO1 NF-κB PI3K/Akt pathway Calorie restriction Aging 

Notes

Acknowledgements

This research was supported by KOSEF and MOST through National Nuclear Technology Program (2006–04978 and 2007–00376). We are thankful to the “Aging Tissue Bank” (R21–2000–000–00021–0) granted by Korea Science and Engineering Foundation.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Dae Hyun Kim
    • 1
  • Ji Young Kim
    • 1
  • Byung Pal Yu
    • 2
    • 3
  • Hae Young Chung
    • 1
    • 2
  1. 1.Department of Pharmacy, College of Pharmacy, Pusan National University, Longevity Life Science and Technology InstitutesPusan National UniversityGumjung-guKorea
  2. 2.Longevity Life Science and Technology, InstitutesPusan National UniversityGumjung-guKorea
  3. 3.Department of PhysiologyThe University of Texas Health Science Center at San AntonioSan AntonioUSA

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