PMID- 17428180 OWN - NLM STAT- MEDLINE DCOM- 20071126 LR - 20091119 IS - 0199-9885 (Print) IS - 0199-9885 (Linking) VI - 27 DP - 2007 TI - Conserved and tissue-specific genic and physiologic responses to caloric restriction and altered IGFI signaling in mitotic and postmitotic tissues. PG - 193-217 AB - Caloric restriction (CR), the consumption of fewer calories without malnutrition, and reduced insulin and/or IGFI receptor signaling delay many age-related physiological changes and extend the lifespan of many model organisms. Here, we present and review microarray and biochemical studies indicating that the potent anticancer effects of CR and disrupted insulin/IGFI receptor signaling evolved as a byproduct of the role of many mitotic tissues as reservoirs of metabolic energy. We argue that the longevity effects of CR are derived from repeated cycles of apoptosis and autophagic cell death in mitotically competent tissues and protein turnover and cellular repair in postmitotic tissues. We review studies showing that CR initiated late in life can rapidly induce many of the benefits of lifelong CR, including its anticancer effects. We also discuss evidence from liver and heart indicating that many benefits of lifelong CR are recapitulated in mitotic and postmitotic tissues when CR is initiated late in life. FAU - Spindler, Stephen R AU - Spindler SR AD - Department of Biochemistry, University of California, Riverside, CA 92521, USA. spindler@ucr.edu FAU - Dhahbi, Joseph M AU - Dhahbi JM LA - eng PT - Journal Article PT - Review PL - United States TA - Annu Rev Nutr JT - Annual review of nutrition JID - 8209988 RN - EC 2.7.10.1 (Receptor, IGF Type 1) SB - IM MH - Aging/*physiology MH - Animals MH - *Caloric Restriction MH - Humans MH - Longevity MH - Mice MH - Mitosis/*physiology MH - Models, Animal MH - Nutritional Physiological Phenomena/*physiology MH - Oligonucleotide Array Sequence Analysis MH - Receptor, IGF Type 1/metabolism/*physiology RF - 137 EDAT- 2007/04/13 09:00 MHDA- 2007/12/06 09:00 CRDT- 2007/04/13 09:00 PHST- 2007/04/13 09:00 [pubmed] PHST- 2007/12/06 09:00 [medline] PHST- 2007/04/13 09:00 [entrez] AID - 10.1146/annurev.nutr.27.061406.093743 [doi] PST - ppublish SO - Annu Rev Nutr. 2007;27:193-217. doi: 10.1146/annurev.nutr.27.061406.093743.