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2014 ; 6
(5
): 390-8
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Target of rapamycin signalling mediates the lifespan-extending effects of dietary
restriction by essential amino acid alteration
#MMPMID24861087
Emran S
; Yang M
; He X
; Zandveld J
; Piper MD
Aging (Albany NY)
2014[May]; 6
(5
): 390-8
PMID24861087
show ga
Dietary restriction (DR), defined as a moderate reduction in food intake short of
malnutrition, has been shown to extend healthy lifespan in a diverse range of
organisms, from yeast to primates. Reduced signalling through the
insulin/IGF-like (IIS) and Target of Rapamycin (TOR) signalling pathways also
extend lifespan. InDrosophila melanogaster the lifespan benefits of DR can be
reproduced by modulating only the essential amino acids in yeast based food.
Here, we show that pharmacological downregulation of TOR signalling, but not
reduced IIS, modulates the lifespan response to DR by amino acid alteration. Of
the physiological responses flies exhibit upon DR, only increased body fat and
decreased heat stress resistance phenotypes correlated with longevity via reduced
TOR signalling. These data indicate that lowered dietary amino acids promote
longevity via TOR, not by enhanced resistance to molecular damage, but through
modified physiological conditions that favour fat accumulation.