Structural, functional and molecular analysis of the effects of aging in the small intestine and colon of C57BL/6J mice

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• 作者：Wilma T Steegenga (1)
  Nicole JW de Wit (1) (2)
  Mark V Boekschoten (1) (2)
  Noortje IJssennagger (1) (2)
  Carolien Lute (1)
  Shohreh Keshtkar (1)
  Mechteld M Grootte Bromhaar (1) (2)
  Ellen Kampman (1)
  Lisette C de Groot (1)
  Michael Muller (1) (2)
  
• 关键词：Aging ; Small intestine ; Colon ; Transcriptomics ; Fat ; Diet ; DNA methylation ; C57BL/6J mice ; Morphology ; Microbiota
• 刊名：BMC Medical Genomics
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：5
• 期：1
• 全文大小：1193KB
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  61. The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1755-8794/5/38/prepub
  
• 作者单位：Wilma T Steegenga (1)
  Nicole JW de Wit (1) (2)
  Mark V Boekschoten (1) (2)
  Noortje IJssennagger (1) (2)
  Carolien Lute (1)
  Shohreh Keshtkar (1)
  Mechteld M Grootte Bromhaar (1) (2)
  Ellen Kampman (1)
  Lisette C de Groot (1)
  Michael Muller (1) (2)
  
  1. Division of Human Nutrition, Wageningen University, Wageningen, The Netherlands
  2. The Netherlands Nutrigenomics Centre, TI Food and Nutrition, Wageningen, The Netherlands
  
• ISSN：1755-8794

文摘

Background By regulating digestion and absorption of nutrients and providing a barrier against the external environment the intestine provides a crucial contribution to the maintenance of health. To what extent aging-related changes in the intestinal system contribute to the functional decline associated with aging is still under debate. Methods Young (4 M) and old (21 M) male C57BL/6J mice were fed a control low-fat (10E%) or a high-fat diet (45E%) for 2 weeks. During the intervention gross energy intake and energy excretion in the feces were measured. After sacrifice the small and large intestine were isolated and the small intestine was divided in three equal parts. Swiss rolls were prepared of each of the isolated segments for histological analysis and the luminal content was isolated to examine alterations in the microflora with 16S rRNA Q-PCR. Furthermore, mucosal scrapings were isolated from each segment to determine differential gene expression by microarray analysis and global DNA methylation by pyrosequencing. Results Digestible energy intake was similar between the two age groups on both the control and the high-fat diet. Microarray analysis on RNA from intestinal scrapings showed no marked changes in expression of genes involved in metabolic processes. Decreased expression of Cubilin was observed in the intestine of 21-month-old mice, which might contribute to aging-induced vitamin B12 deficiency. Furthermore, microarray data analysis revealed enhanced expression of a large number of genes involved in immune response and inflammation in the colon, but not in the small intestine of the 21-month-old mice. Aging-induced global hypomethylation was observed in the colon and the distal part of the small intestine, but not in the first two sections of the small intestine. Conclusion In 21-month old mice the most pronounced effects of aging were observed in the colon, whereas very few changes were observed in the small intestine.