Adipose tissue growth and regression are regulated by angiopoietin-1

Adipose tissue is unique in its plasticity, capacity for vascular remodeling, and susceptibility to angiogenesis inhibitors. We hypothesize that these characteristics are enabled by maintaining relatively immature adipose vessels to facilitate vascular/tissue remodeling. We examined the vascular mat...

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Bibliographic Details
Published in:Biochemical and biophysical research communications 2003-11, Vol.311 (3), p.563-571
Main Authors: Dallabrida, Susan M, Zurakowski, David, Shih, Shu-Ching, Smith, Lois E, Folkman, Judah, Moulton, Karen S, Rupnick, Maria A
Format: Article
Language:English
Subjects:
3T3-L1 Cells
Adipose tissue
Adipose Tissue - physiology
Angiogenesis
Angiopoietin-1
Angiopoietin-1 - physiology
Angiopoietin-2
Angiopoietin-2 - biosynthesis
Animals
Blotting, Northern
Blotting, Western
Cyclohexanes
Leptin
Leptin - metabolism
Male
Mice
Mice, Inbred C57BL
Mice, Obese
O-(Chloroacetylcarbamoyl)fumagillol
Plasmids - metabolism
Precipitin Tests
Receptor, TIE-2 - biosynthesis
Reverse Transcriptase Polymerase Chain Reaction
RNA, Messenger - metabolism
Sesquiterpenes - pharmacology
Tie2
Time Factors
Tissue Distribution
TNP-470
Transgenes
Vascular maturation
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Summary:Adipose tissue is unique in its plasticity, capacity for vascular remodeling, and susceptibility to angiogenesis inhibitors. We hypothesize that these characteristics are enabled by maintaining relatively immature adipose vessels to facilitate vascular/tissue remodeling. We examined the vascular maturation regulators, angiopoietin-1, angiopoietin-2, and tie2 receptor, under different weight-modifying conditions. Adipocytes expressed angiopoietin-1, while adipose endothelial cells expressed angiopoietin-2 and tie2. Adipose tissue growth/regression were associated with decreased angiopoietin-1 mRNA and protein, and tie2 phosphorylation. Angiopoietin-2 and tie2 mRNA levels were stable. Angiopoietin-1 mRNA levels inversely correlated with the rates of change in body weight, independent of the direction (weight gain, loss) or etiology (TNP-470, leptin, and diet restriction) of the weight shift. Obese mice injected with ang1/pcDNA had reduced rates of weight gain and fat pad weights, regardless of the route of plasmid administration (subcutaneous, intramuscular, and intravenous). Thus, angiopoietin-1 may regulate adipose tissue growth, suggesting that vascular maturation alters tissue plasticity.
ISSN:0006-291X
1090-2104
DOI:10.1016/j.bbrc.2003.10.007