Unknown

Dataset Information

0

Farnesoid X receptor directly regulates xenobiotic detoxification genes in the long-lived Little mice.


ABSTRACT: Activation of xenobiotic metabolism pathways has been linked to lifespan extension in different models of aging. However, the mechanisms underlying activation of xenobiotic genes remain largely unknown. Here we showed that although farnesoid X receptor (FXR, Nr1h4) mRNA levels do not change significantly, FXR protein levels are elevated in the livers of the long-lived Little mice, leading to increased DNA binding activity of FXR. Hepatic FXR expression is sex-dependent in wild-type mice but not in Little mice, implying that up-regulation of FXR might be dependent on the reduction of growth hormone in Little mice. Growth hormone treatment decreased hepatic expression of FXR and xenobiotic genes Abcb1a, Fmo3 and Gsta2 in both wild-type and Little mice, suggesting an association between FXR and xenobiotic gene expression. We found that Abcb1a is transactivated by FXR via direct binding of FXR/retinoid X receptor ? (RXR?) heterodimer to a response element at the proximal promoter. FXR also positively controls Fmo3 and Gsta2 expression through direct interaction with the response elements in these genes. Our study demonstrates that xenobiotic genes are direct transcriptional targets of FXR and suggests that FXR signaling may play a critical role in the lifespan extension observed in Little mice.

SUBMITTER: Jiang Y 

PROVIDER: S-EPMC3845407 | biostudies-literature | 2013 Sep

REPOSITORIES: biostudies-literature

altmetric image

Publications

Farnesoid X receptor directly regulates xenobiotic detoxification genes in the long-lived Little mice.

Jiang Yanjun Y   Jin Jingling J   Iakova Polina P   Hernandez Julio Cesar JC   Jawanmardi Nicole N   Sullivan Emily E   Guo Grace L GL   Timchenko Nikolai A NA   Darlington Gretchen J GJ  

Mechanisms of ageing and development 20130902 9


Activation of xenobiotic metabolism pathways has been linked to lifespan extension in different models of aging. However, the mechanisms underlying activation of xenobiotic genes remain largely unknown. Here we showed that although farnesoid X receptor (FXR, Nr1h4) mRNA levels do not change significantly, FXR protein levels are elevated in the livers of the long-lived Little mice, leading to increased DNA binding activity of FXR. Hepatic FXR expression is sex-dependent in wild-type mice but not  ...[more]

Similar Datasets

| S-EPMC2859448 | biostudies-literature
| S-EPMC3192141 | biostudies-literature
| S-EPMC3175716 | biostudies-literature
| S-EPMC4467904 | biostudies-other
| S-EPMC4657204 | biostudies-literature
| S-EPMC6050962 | biostudies-literature
| S-EPMC6557611 | biostudies-literature
| S-EPMC9874112 | biostudies-literature
| S-EPMC4486168 | biostudies-literature
| S-EPMC2944910 | biostudies-literature