title: [Effect of aging on the ability of growth and differentiation of rat bone marrow stromal cells].
abstract: OBJECTIVE
  To measure the osteogenesis and adipogenesis potentiality of rat marrow stromal cells (MSCs) derived from 3, 6, 9, 12-month-old doner rats.
  
  
  METHODS
  Rat MSCs were induced to osteoblast or adipocyte by osteogenic inducer or adipogenic inducer. In different times, 3 and 12-month-old rat MSCs were observed by histochemistry staining; the mRNA level of type I collagen and lipoprotein lipase of 3, 6, 9, 12-month-old rat MSCs were measured by RT-PCR.
  
  
  RESULTS
  The expression of alkaline phosphatase (ALP) of the control group and induced group of 12-month old rat MSCs was less than that of 3-month old rat MSCs after 1-week osteogenic induction. 12 days later, calcification was observed in 3-month old group. Lipid droplets occurred in the cells of 12-month old group after 2-day adipogenic induction, while these droplets occurred after 3-day or 4-day induction in 3-month old group. The mRNA level of type I collagen decreased with the increase of age. The mRNA level of lipoprotein lipase of younger rats was lower than that of older rats. Both of the changes were more significantly with the increase of the induction time.
  
  
  CONCLUSIONS
  With the increase of age, the ability of osteogenesis of rat MSCs decreased, but the ability of adipogenesis increased.
authors.affiliation: Institute of Biomedical Engineering, West China Center of Medical Sciences, Sichuan University, Chengdu 610041, China. chq@wcums.edu.cn
authors.forename: Huai-qing
authors.initials: HQ
authors.lastname: Chen
authors.forename: Rong
authors.initials: R
authors.lastname: Yao
authors.forename: Jun
authors.initials: J
authors.lastname: Han
authors.forename: Li
authors.initials: L
authors.lastname: Deng
authors.forename: Liang
authors.initials: L
authors.lastname: Li
mesh_terms: D000273:Adipose Tissue / Q000254:growth & development*; D000375:Aging; D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D001483:Base Sequence; D001854:Bone Marrow Cells / Q000166:cytology*; D002454:Cell Differentiation; D002478:Cells, Cultured; D024042:Collagen Type I / Q000096:biosynthesis / Q000235:genetics; D005260:Female; D008071:Lipoprotein Lipase / Q000096:biosynthesis / Q000235:genetics; D008969:Molecular Sequence Data; D010012:Osteogenesis; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D017154:Stromal Cells / Q000166:cytology
chemical_list: D024042:Collagen Type I; D012333:RNA, Messenger; D008071:Lipoprotein Lipase; D000469:Alkaline Phosphatase