Essential amino acids improve insulin activation of akt/mtor signaling in soleus muscle of aged rats

V. Flati, F. Caliaro, S. Speca, G. Corsetti, A. Cardile, E. Nisoli, R. Bottinelli, G. D'Antona

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Essential amino acids (EAA) improve basal muscle protein synthesis in the elderly. Nevertheless, in settings of prolonged supplementation, putative signal pathways of EAA are currently unknown. The purpose of this study was to test the effects of prolonged supplementation of EAA enriched mixture (12-L-Amin) on Insulin/Insulin-like Growth Factor-1 (IGF1) pathway by measuring total and phosphorylated Akt (Ser473) and its upstream (IRS1 at Ser 636) and downstream (mTOR at Ser2448, p70S6K at Thr389) targets in basal conditions and following acute insulin (0.1 U/L) incubation in vitro. To this aim, soleus muscles were dissected from male Wistar rats divided in three groups of 7 each: adults (AD, 10 mo of age), elderly (EL, 22 mo of age) and elderly supplemented (EL-AA, 12-L-Amin 1.5gr/Kg die in drinking water for 3mo). EL showed reduced basal and post-insulin mTOR and p70S6K activation and reduced post-insulin IRS1 degradation relative to AD. EL-AA showed an increase of post-insulin Akt activation, no change in basal and post-insulin phospho-mTOR, lower reduction of phospho-p70S6K and increased post-insulin IRS1 degradation relative to AD. These results demonstrate that chronic 12-L-Amin administration exerts anti-ageing effects on the activation/inactivation of the Insulin/IGF1/mTOR pathway which is identified as putative target of EAA in the elderly.

Original languageEnglish
Pages (from-to)81-89
Number of pages9
JournalInternational Journal of Immunopathology and Pharmacology
Volume23
Issue number1
Publication statusPublished - Jan 2010

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Essential Amino Acids
Skeletal Muscle
Insulin
70-kDa Ribosomal Protein S6 Kinases
Somatomedins
Muscle Proteins
Drinking Water
Wistar Rats
Signal Transduction

Keywords

  • Ageing
  • Insulin
  • Nutrition
  • Nutritional supplements
  • Protein synthesis

ASJC Scopus subject areas

  • Pharmacology
  • Immunology
  • Immunology and Allergy

Cite this

Flati, V., Caliaro, F., Speca, S., Corsetti, G., Cardile, A., Nisoli, E., ... D'Antona, G. (2010). Essential amino acids improve insulin activation of akt/mtor signaling in soleus muscle of aged rats. International Journal of Immunopathology and Pharmacology, 23(1), 81-89.

Essential amino acids improve insulin activation of akt/mtor signaling in soleus muscle of aged rats. / Flati, V.; Caliaro, F.; Speca, S.; Corsetti, G.; Cardile, A.; Nisoli, E.; Bottinelli, R.; D'Antona, G.

In: International Journal of Immunopathology and Pharmacology, Vol. 23, No. 1, 01.2010, p. 81-89.

Research output: Contribution to journalArticle

Flati, V, Caliaro, F, Speca, S, Corsetti, G, Cardile, A, Nisoli, E, Bottinelli, R & D'Antona, G 2010, 'Essential amino acids improve insulin activation of akt/mtor signaling in soleus muscle of aged rats', International Journal of Immunopathology and Pharmacology, vol. 23, no. 1, pp. 81-89.
Flati, V. ; Caliaro, F. ; Speca, S. ; Corsetti, G. ; Cardile, A. ; Nisoli, E. ; Bottinelli, R. ; D'Antona, G. / Essential amino acids improve insulin activation of akt/mtor signaling in soleus muscle of aged rats. In: International Journal of Immunopathology and Pharmacology. 2010 ; Vol. 23, No. 1. pp. 81-89.
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