Linked Life Data

19177596

Source:http://linkedlifedata.com/resource/pubmed/id/19177596

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2009-4-6
pubmed:abstractText
Hepatic steatosis is a hallmark of nonalcoholic fatty liver disease (NAFLD) and a key component of obesity-associated metabolic dysfunctions featuring dyslipidemia, insulin resistance, and loss of glycemic control. It has yet to be completely understood how much dysregulated de novo lipogenesis contributes to the pathogenic development of hepatic steatosis and insulin resistance. ATP-citrate lyase (ACL) is a lipogenic enzyme that catalyzes the critical reaction linking cellular glucose catabolism and lipogenesis, converting cytosolic citrate to acetyl-coenzyme A (CoA). Acetyl-CoA is further converted to malonyl-CoA, the essential precursor for fatty acid biosynthesis. We investigated whether dysregulation of hepatic ACL is metabolically connected to hepatic steatosis, insulin resistance, and hyperglycemia. We found that in leptin receptor-deficient db/db mice, the expression of ACL was selectively elevated in the liver but not in the white adipose tissue. Liver-specific ACL abrogation via adenovirus-mediated RNA interference prominently reduced the hepatic contents of both acetyl-CoA and malonyl-CoA, markedly inhibited hepatic de novo lipogenesis, and protected against hepatic steatosis in db/db mice. Surprisingly, liver-specific ACL abrogation markedly inhibited the expression of peroxisome proliferator-activated receptor-gamma and the entire lipogenic program in the liver. Moreover, hepatic ACL deficiency resulted in significantly down-regulated expression of gluconeogenic genes in the liver as well as enhanced insulin sensitivity in the muscle, leading to substantially improved systemic glucose metabolism. CONCLUSION: These findings establish a crucial role of hepatic ACL in lipid and glucose metabolism; therefore, hepatic ACL may serve as a potential target to treat NAFLD and type 2 diabetes.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1527-3350
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
49
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1166-75
pubmed:meshHeading
pubmed-meshheading:19177596-ATP Citrate (pro-S)-Lyase, pubmed-meshheading:19177596-Acetyl Coenzyme A, pubmed-meshheading:19177596-Animals, pubmed-meshheading:19177596-Fatty Acids, Nonesterified, pubmed-meshheading:19177596-Fatty Liver, pubmed-meshheading:19177596-Glucose, pubmed-meshheading:19177596-Homeostasis, pubmed-meshheading:19177596-Hyperglycemia, pubmed-meshheading:19177596-Insulin Resistance, pubmed-meshheading:19177596-Lipid Metabolism, pubmed-meshheading:19177596-Lipogenesis, pubmed-meshheading:19177596-Liver, pubmed-meshheading:19177596-Male, pubmed-meshheading:19177596-Malonyl Coenzyme A, pubmed-meshheading:19177596-Mice, pubmed-meshheading:19177596-Mice, Inbred C57BL, pubmed-meshheading:19177596-Mice, Knockout, pubmed-meshheading:19177596-RNA Interference, pubmed-meshheading:19177596-Receptors, Leptin
pubmed:year
2009
pubmed:articleTitle
Abrogation of hepatic ATP-citrate lyase protects against fatty liver and ameliorates hyperglycemia in leptin receptor-deficient mice.
pubmed:affiliation
Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Chinese Academy of Sciences, the Graduate School of the Chinese Academy of Sciences, Shanghai, China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't