Severity: Warning
Message: file_get_contents(https://...@gmail.com&api_key=61f08fa0b96a73de8c900d749fcb997acc09): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
Filename: helpers/my_audit_helper.php
Line Number: 143
Backtrace:
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 143
Function: file_get_contents
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 209
Function: simplexml_load_file_from_url
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 994
Function: getPubMedXML
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 3134
Function: GetPubMedArticleOutput_2016
File: /var/www/html/application/controllers/Detail.php
Line: 574
Function: pubMedSearch_Global
File: /var/www/html/application/controllers/Detail.php
Line: 488
Function: pubMedGetRelatedKeyword
File: /var/www/html/index.php
Line: 316
Function: require_once
Long-term administration of some antiepileptic drugs often increases blood lipid levels. In this study, we investigated its molecular mechanism by focusing on the nuclear receptors constitutive active/androstane receptor (CAR) and peroxisome proliferator-activated receptor (PPAR), which are key transcription factors for enzyme induction and lipid metabolism, respectively, in the liver. Treatment of mice with the CAR activator phenobarbital, an antiepileptic drug, increased plasma triglyceride levels and decreased the hepatic expression of PPAR target genes related to lipid metabolism. The increase in PPAR target gene expression induced by fenofibrate, a PPAR ligand, was inhibited by cotreatment with phenobarbital. CAR suppressed PPAR-dependent gene transcription in HepG2 cells but not in COS-1 cells. The mRNA level of peroxisome proliferator-activated receptor coactivator 1 (PGC1), a coactivator for both CAR and PPAR, in COS-1 cells was much lower than in HepG2 cells. In reporter assays with COS-1 cells overexpressing PGC1, CAR suppressed PPAR-dependent gene transcription, depending on the coactivator-binding motif. In mammalian two-hybrid assays, CAR attenuated the interaction between PGC1 and PPAR Chemical inhibition of PGC1 prevented phenobarbital-dependent increases in plasma triglyceride levels and the inhibition of PPAR target gene expression. These results suggest that CAR inhibits the interaction between PPAR and PGC1, attenuating PPAR-dependent lipid metabolism. This might explain the antiepileptic drug-induced elevation of blood triglyceride levels. SIGNIFICANCE STATEMENT: Constitutive active/androstane receptor activated by antiepileptic drugs inhibits the peroxisome proliferator-activated receptor -dependent transcription of genes related to lipid metabolism and upregulates blood triglyceride levels. The molecular mechanism of this inhibition involves competition between these nuclear receptors for coactivator peroxisome proliferator-activated receptor coactivator-1 binding.
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Source |
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http://dx.doi.org/10.1124/molpharm.120.000103 | DOI Listing |
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