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PMID: 11306606 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

PPARalpha deficiency reduces insulin resistance and atherosclerosis in apoE-null mice.

The Journal of clinical investigation ·Vol. 107 ·No. 8 ·2001-04-00 ·Pages 1025-34

Tordjman K, Bernal-Mizrachi C, Zemany L, Weng S, Feng C, Zhang F, Leone TC, Coleman T, Kelly DP, Semenkovich CF

Abstract

PPARalpha is a ligand-dependent transcription factor expressed at high levels in the liver. Its activation by the drug gemfibrozil reduces clinical events in humans with established atherosclerosis, but the underlying mechanisms are incompletely defined. To clarify the role of PPARalpha in vascular disease, we crossed PPARalpha-null mice with apoE-null mice to determine if the genetic absence of PPARalpha affects vascular disease in a robust atherosclerosis model. On a high-fat diet, concentrations of atherogenic lipoproteins were higher in PPARalpha(-/-)apoE(-/-) than in PPARalpha(+/+)apoE(-/-) mice, due to increased VLDL production. However, en face atherosclerotic lesion areas at the aortic arch, thoracic aorta, and abdominal aorta were less in PPARalpha-null animals of both sexes after 6 and 10 weeks of high-fat feeding. Despite gaining as much or more weight than their PPARalpha(+/+)apoE(-/-) littermates, PPARalpha(-/-)apoE(-/-) mice had lower fasting levels of glucose and insulin. PPARalpha-null animals had greater suppression of endogenous glucose production in hyperinsulinemic clamp experiments, reflecting less insulin resistance in the absence of PPARalpha. PPARalpha(-/-)apoE(-/-) mice also had lower blood pressures than their PPARalpha(+/+)apoE(-/-) littermates after high-fat feeding. These results suggest that PPARalpha may participate in the pathogenesis of diet-induced insulin resistance and atherosclerosis.

MeSH Terms
Animals Aorta/metabolism Apolipoproteins E/genetics,metabolism,physiology Arteriosclerosis/metabolism,pathology Blood Pressure CD36 Antigens/genetics Chemokine CCL2/genetics Dietary Fats/metabolism Female Gene Expression Glucose/metabolism Insulin Resistance Lipoprotein Lipase/metabolism Lipoproteins/metabolism Macrophages/metabolism Male Mice Mice, Inbred C57BL Mice, Knockout Pyrimidines/metabolism Receptors, Cytoplasmic and Nuclear/genetics,metabolism,physiology Transcription Factors/genetics,metabolism,physiology
Chemicals
Apolipoproteins E CD36 Antigens Chemokine CCL2 Dietary Fats Lipoproteins Pyrimidines Receptors, Cytoplasmic and Nuclear Transcription Factors pirinixic acid Lipoprotein Lipase Glucose
Authors & Affiliations
10 authors, click to expand affiliations / ORCID
Tordjman K
Department of Medicine and the Center for Cardiovascular Research, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.
Bernal-Mizrachi C
Zemany L
Weng S
Feng C
Zhang F
Leone T C
Coleman T
Kelly D P
Semenkovich C F
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Article Info
Journal
The Journal of clinical investigation
Abbr.
J Clin Invest
ISSN
0021-9738
Published
2001-04-00
Pages
1025-34
Language
English
Region
United States
NLM ID
7802877
PMCID
PMC199556
Subset
IM
Grants
NHLBI NIH HHS · R01 HL058427 · United States
NIDDK NIH HHS · DK20579 · United States
NIDDK NIH HHS · P30 DK056341 · United States
NHLBI NIH HHS · HL-58427 · United States
NIDDK NIH HHS · P60 DK020579 · United States
NIDDK NIH HHS · DK-53198 · United States
NIDDK NIH HHS · P30 DK020579 · United States
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