Fat depot-specific differences in angiogenic growth factor gene expression and its relation to adipocyte size in cattle.
Adipocytes derived from different anatomical sites vary in the expression of adipocytokines and growth factor genes. Adipogenesis is tightly associated with angiogenesis, although the regional variation of angiogenic growth factor gene expression in adipose tissues remains unclear. In this experiment, we studied the fat depot-specific differences (subcutaneous, intramuscular, intermuscular, renal, and mesenteric) in the expression of angiogenic growth factor mRNA [vascular endothelial growth factor (VEGF), fibroblast growth factor-2 (FGF-2), fibroblast growth factor-10 (FGF-10), hepatocyte growth factor (HGF), and leptin], as well as the relationship between angiogenic growth factor mRNA level and adipocyte size in bovine adipose tissues. Intermuscular, renal, and mesenteric adipose tissues expressed significantly higher VEGF, FGF-2, and leptin mRNA levels than did subcutaneous and intramuscular adipose tissues. Mesenteric adipose tissue also expressed higher FGF-10 mRNA levels than did subcutaneous and intramuscular adipose tissues. There was no significant difference in the expression of HGF mRNA among adipose tissue depots. A significant correlation existed between adipocyte size and VEGF, FGF-2, FGF-10, and leptin mRNA levels. These results indicate that fat depot-specific difference in angiogenic growth factor gene expression results from the difference in adipocyte size.
National Institute of Livestock and Grassland Science, Tochigi, Japan. toyamada@affrc.go.jp
Tomoya
T
Yamada
Shin-ichi
S
Kawakami
Naoto
N
Nakanishi
D017667:Adipocytes / Q000166:cytology*; D000273:Adipose Tissue / Q000166:cytology / Q000502:physiology; D042501:Angiogenic Proteins / Q000235:genetics*; D000818:Animals; D002417:Cattle / Q000033:anatomy & histology / Q000235:genetics*; D048429:Cell Size; D017931:DNA Primers; D051526:Fibroblast Growth Factor 10 / Q000235:genetics; D016222:Fibroblast Growth Factor 2 / Q000235:genetics; D005786:Gene Expression Regulation; D017228:Hepatocyte Growth Factor / Q000235:genetics; D020738:Leptin / Q000235:genetics; D008297:Male; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000235:genetics; D012269:Ribosomal Proteins / Q000235:genetics; D042461:Vascular Endothelial Growth Factor A / Q000235:genetics
D042501:Angiogenic Proteins; D017931:DNA Primers; D051526:Fibroblast Growth Factor 10; D020738:Leptin; D012333:RNA, Messenger; D012269:Ribosomal Proteins; D042461:Vascular Endothelial Growth Factor A; D016222:Fibroblast Growth Factor 2; D017228:Hepatocyte Growth Factor