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2016 ; 30
(4
): 1634-42
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Circadian clocks govern calorie restriction-mediated life span extension through
BMAL1- and IGF-1-dependent mechanisms
#MMPMID26700733
Patel SA
; Chaudhari A
; Gupta R
; Velingkaar N
; Kondratov RV
FASEB J
2016[Apr]; 30
(4
): 1634-42
PMID26700733
show ga
Calorie restriction (CR) increases longevity in many species by unknown
mechanisms. The circadian clock was proposed as a potential mediator of CR.
Deficiency of the core component of the circadian clock-transcriptional factor
BMAL1 (brain and muscle ARNT [aryl hydrocarbon receptor nuclear
translocator]-like protein 1)-results in accelerated aging. Here we investigated
the role of BMAL1 in mechanisms of CR. The 30% CR diet increased the life span of
wild-type (WT) mice by 20% compared to mice on anad libitum(AL) diet but failed
to increase life span ofBmal1(-/-)mice. BMAL1 deficiency impaired CR-mediated
changes in the plasma levels of IGF-1 and insulin. We detected a statistically
significantly reduction of IGF-1 in CRvs.AL by 50 to 70% in WT mice at several
daily time points tested, while inBmal1(-/-)the reduction was not significant.
Insulin levels in WT were reduced by 5 to 9%, whileBmal1(-/-)induced it by 10 to
35% at all time points tested. CR up-regulated the daily average expression
ofBmal1(by 150%) and its downstream target genesPeriods(by 470% forPer1and by
130% forPer2). We propose that BMAL1 is an important mediator of CR, and
activation of BMAL1 might link CR mechanisms with biologic clocks.-Patel, S. A.,
Chaudhari, A., Gupta, R., Velingkaar, N., Kondratov, R. V. Circadian clocks
govern calorie restriction-mediated life span extension through BMAL1- and
IGF-1-dependent mechanisms.