期刊
MOLECULAR GENETICS AND GENOMICS
卷 291, 期 2, 页码 831-847出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00438-015-1150-3
关键词
Caloric restriction strength; Transcriptome; Mice; Transcription factor; Adipose tissue
资金
- Bio and Medical Technology Development Program of the National Research Foundation (NRF) - Ministry of Science, ICT and Future Planning [NRF-2011-0030137]
- Cooperative Research Program for Agriculture Science and Technology Development, Rural Development Administration [PJ01053302]
- Technology Commercialization Support Program, Ministry for Food, Agriculture, Forestry and Fisheries, Republic of Korea [811003-03-3-SU000]
- NRF - Korea government (MSIP), Republic of Korea [2015064915]
Caloric restriction (CR) has been shown to extend the lifespan of many species by improving cellular function and organismal health. Additionally, fat reduction by CR may play an important role in lengthening lifespan and preventing severe age-related diseases. Interestingly, CR induced the greatest transcriptome change in the epididymal fat of mice in our study. In this transcriptome analysis, we identified and categorized 446 genes that correlated with CR level. We observed down-regulation of several signaling pathways, including insulin/insulin-like growth factor 1 (insulin/IGF-1), epidermal growth factor (EGF), transforming growth factor beta (TGF-beta), and canonical wingless-type mouse mammary tumor virus integration site (Wnt). Many genes related to structural features, including extracellular matrix structure, cell adhesion, and the cytoskeleton, were down-regulated, with a strong correlation to the degree of CR. Furthermore, genes related to the cell cycle and adipogenesis were down-regulated. These biological processes are well-identified targets of insulin/IGF-1, EGF, TGF-beta, and Wnt signaling. In contrast, genes involved in specific metabolic processes, including the tricarboxylic acid cycle and the electron transport chain were up-regulated. We performed in silico analysis of the promoter sequences of CR-responsive genes and identified two associated transcription factors, Paired-like homeodomain 2 (Pitx2) and Paired box gene 6 (Pax6). Our results suggest that strict regulation of signaling pathways is critical for creating the optimal energy homeostasis to extend lifespan.
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