Document Detail


Impaired lipid accumulation by trans10, cis12 CLA during adipocyte differentiation is dependent on timing and length of treatment.
MedLine Citation:
PMID:  15708349     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Conjugated linoleic acids (CLAs) are a group of polyunsaturated fatty acids found in ruminant products, where the predominant isomers are cis9, trans11 (c9,t11) and trans10, cis12 (t10,c12) CLA. We have previously shown that t10,c12 CLA prevents lipid accumulation in mature adipocytes in part by acting as a peroxisome proliferator-activated receptor gamma (PPAR gamma) modulator. The objective of this study was to further establish the molecular mechanisms underlying the attenuating effect on lipid accumulation by t10,c12 CLA, with focus on time point and duration of treatment during adipogenesis. We have shown that t10,c12 CLA treatment has its most attenuating effect early (day (D) 0-6) during differentiation. Treatment during this period is sufficient to prevent lipid accumulation in mature adipocytes. The adipogenic marker genes PPAR gamma and CCAAT/enhancer binding protein alpha (C/EBP alpha) are both down-regulated after treatment within the period from D0-6, while additional treatment also down-regulates the expression of sterol regulatory element binding protein-1c (SREBP-1c), liver X receptor alpha (LXR alpha), fatty acid binding protein (aP2), fatty acid translocase (CD36) and insulin-sensitive glucose transporter 4 (GLUT4). These effects of t10,c12 CLA reflect the subsequent attenuation of lipid accumulation observed in mature adipocytes. Interestingly, the early B-cell factor (O/E-1), which is known to promote adipogenesis and to be involved in control of genes important for terminal adipocyte differentiation, is unaffected by treatment of t10,c12 CLA. Taken together, our data indicate that inhibition of lipid accumulation induced by t10,c12 CLA treatment during adipocyte differentiation is associated with a tight regulatory cross-talk between early (PPAR gamma and C/EBP alpha) and late (LXR alpha, aP2 and CD36) adipogenic marker genes.
Authors:
Linda Granlund; Jan I Pedersen; Hilde I Nebb
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  1687     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-02-14     Completed Date:  2005-04-18     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  11-22     Citation Subset:  IM    
Affiliation:
Institute of Basic Medical Sciences, Department of Nutrition, University of Oslo, N-0316 Oslo, Norway.
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MeSH Terms
Descriptor/Qualifier:
3T3 Cells
Adipocytes / cytology,  drug effects*,  physiology*
Animals
Antigens, CD36 / genetics,  metabolism
CCAAT-Enhancer-Binding Protein-alpha / genetics,  metabolism
CCAAT-Enhancer-Binding Proteins / genetics,  metabolism
Carrier Proteins / genetics,  metabolism
Cell Differentiation / physiology*
DNA-Binding Proteins / genetics,  metabolism
Fatty Acid-Binding Proteins
Gene Expression Regulation, Developmental*
Glucose Transporter Type 4
Humans
Linoleic Acids, Conjugated / pharmacology*
Lipid Metabolism*
Mice
Monosaccharide Transport Proteins / genetics,  metabolism
Muscle Proteins / genetics,  metabolism
Orphan Nuclear Receptors
PPAR gamma / genetics,  metabolism
Receptors, Cytoplasmic and Nuclear / genetics,  metabolism
Signal Transduction / physiology
Sterol Regulatory Element Binding Protein 1
Time Factors
Transcription Factors / genetics,  metabolism
Chemical
Reg. No./Substance:
0/Antigens, CD36; 0/CCAAT-Enhancer-Binding Protein-alpha; 0/CCAAT-Enhancer-Binding Proteins; 0/Carrier Proteins; 0/DNA-Binding Proteins; 0/Fatty Acid-Binding Proteins; 0/Glucose Transporter Type 4; 0/Linoleic Acids, Conjugated; 0/Monosaccharide Transport Proteins; 0/Muscle Proteins; 0/Orphan Nuclear Receptors; 0/PPAR gamma; 0/Receptors, Cytoplasmic and Nuclear; 0/SLC2A4 protein, human; 0/SREBF1 protein, human; 0/Slc2a4 protein, mouse; 0/Srebf1 protein, mouse; 0/Sterol Regulatory Element Binding Protein 1; 0/Transcription Factors; 0/liver X receptor; 0/trans-10,cis-12-conjugated linoleic acid

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