Linked Life Data

16777972

Source:http://linkedlifedata.com/resource/pubmed/id/16777972

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
2006-8-16
pubmed:abstractText
Activation of the peroxisome proliferator-activated receptor (PPAR)-alpha increases lipid catabolism and lowers the concentration of circulating lipid, but its role in the control of glucose metabolism is not as clearly established. Here we compared PPARalpha knockout mice with wild type and confirmed that the former developed hypoglycemia during fasting. This was associated with only a slight increase in insulin sensitivity but a dramatic increase in whole-body and adipose tissue glucose use rates in the fasting state. The white sc and visceral fat depots were larger due to an increase in the size and number of adipocytes, and their level of GLUT4 expression was higher and no longer regulated by the fed-to-fast transition. To evaluate whether these adipocyte deregulations were secondary to the absence of PPARalpha from liver, we reexpresssed this transcription factor in the liver of knockout mice using recombinant adenoviruses. Whereas more than 90% of the hepatocytes were infected and PPARalpha expression was restored to normal levels, the whole-body glucose use rate remained elevated. Next, to evaluate whether brain PPARalpha could affect glucose homeostasis, we activated brain PPARalpha in wild-type mice by infusing WY14643 into the lateral ventricle and showed that whole-body glucose use was reduced. Hence, our data show that PPARalpha is involved in the regulation of glucose homeostasis, insulin sensitivity, fat accumulation, and adipose tissue glucose use by a mechanism that does not require PPARalpha expression in the liver. By contrast, activation of PPARalpha in the brain stimulates peripheral glucose use. This suggests that the alteration in adipocyte glucose metabolism in the knockout mice may result from the absence of PPARalpha in the brain.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0013-7227
pubmed:author
pubmed:issnType
Print
pubmed:volume
147
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4067-78
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:16777972-Adipocytes, pubmed-meshheading:16777972-Adipose Tissue, pubmed-meshheading:16777972-Animals, pubmed-meshheading:16777972-Blood Glucose, pubmed-meshheading:16777972-Body Composition, pubmed-meshheading:16777972-Brain, pubmed-meshheading:16777972-Cell Size, pubmed-meshheading:16777972-Fasting, pubmed-meshheading:16777972-Female, pubmed-meshheading:16777972-Glucose, pubmed-meshheading:16777972-Glucose Transporter Type 4, pubmed-meshheading:16777972-Hepatocytes, pubmed-meshheading:16777972-Hypothalamus, pubmed-meshheading:16777972-Liver, pubmed-meshheading:16777972-Mice, pubmed-meshheading:16777972-Mice, Inbred C57BL, pubmed-meshheading:16777972-Mice, Knockout, pubmed-meshheading:16777972-Neuropeptides, pubmed-meshheading:16777972-PPAR alpha, pubmed-meshheading:16777972-Peroxisome Proliferators, pubmed-meshheading:16777972-Pyrimidines, pubmed-meshheading:16777972-RNA, Messenger, pubmed-meshheading:16777972-Reverse Transcriptase Polymerase Chain Reaction
pubmed:year
2006
pubmed:articleTitle
Peroxisome proliferator-activated receptor-alpha-null mice have increased white adipose tissue glucose utilization, GLUT4, and fat mass: Role in liver and brain.
pubmed:affiliation
Unit Mixté de Recherche, 5018, Centre National de la Recherche Scientifique-University Paul Sabatier, IFR 31, Bt L1 Rue J. Poulhès, 31403 Toulouse, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't