Gender-Divergent Profile of Bile Acid Homeostasis during Aging of Mice

被引:55
|
作者
Fu, Zidong Donna [1 ]
Csanaky, Ivan L. [1 ]
Klaassen, Curtis D. [1 ]
机构
[1] Univ Kansas, Med Ctr, Dept Pharmacol Toxicol & Therapeut, Kansas City, KS 66103 USA
来源
PLOS ONE | 2012年 / 7卷 / 03期
基金
美国国家卫生研究院;
关键词
AGE-RELATED-CHANGES; LIFE-SPAN; CHOLESTEROL; LIVER; METABOLISM; RECEPTOR; TRANSPORTERS; EXPRESSION; CLONING; SERUM;
D O I
10.1371/journal.pone.0032551
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Aging is a physiological process with a progressive decline of adaptation and functional capacity of the body. Bile acids (BAs) have been recognized as signaling molecules regulating the homeostasis of glucose, lipid, and energy. The current study characterizes the age-related changes of individual BA concentrations by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) in serum and liver of male and female C57BL/6 mice from 3 to 27 months of age. Total BA concentrations in serum increased 340% from 3 to 27 months in female mice, whereas they remained relatively constant with age in male mice. During aging, male and female mice shared the following changes: (1) BA concentrations in liver remained relatively constant; (2) the proportions of beta-muricholic acid (beta MCA) increased and deoxycholic acid (DCA) decreased between 3 and 27 months in serum and liver; and (3) total BAs in serum and liver became more hydrophilic between 3 and 27 months. In female mice, (1) the mRNAs of hepatic BA uptake transporters, the Na+/taurocholate cotransporting polypeptide (Ntcp) and the organic anion transporting polypeptide 1b2 (Oatp1b2), decreased after 12 months, and similar trends were observed for their proteins; (2) the mRNA of the rate-limiting enzyme for BA synthesis, cholesterol 7 alpha-hydroxylase (Cyp7a1), increased from 3 to 9 months and remained high thereafter. However, in male mice, Ntcp, Oatp1b2, and Cyp7a1 mRNAs remained relatively constant with age. In summary, the current study shows gender-divergent profiles of BA concentrations and composition in serum and liver of mice during aging, which is likely due to the gender-divergent expression of BA transporters Ntcp and Oatp1b2 as well as the synthetic enzyme Cyp7a1.
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页数:13
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