Insulin-like growth factor I mediates high-fat diet-induced adipogenesis in Osborne-Mendel rats.
To determine if high-fat (HF) diet-induced changes in adipose tissue cellularity are associated with the presence of paracrine growth factor(s) that alter preadipocyte proliferation, Osborne-Mendel rats were fed either a HF (76% energy) or a low-fat (LF, 12% energy) diet for 85 days. HF-fed rats had greater (P < 0.05) fat pad size, total fat cell number, number of small (30-70 microm) and large (80-140 microm) adipocytes, and percentage of 100- to 140-microm adipocytes compared with LF-fed rats. Preadipocytes in primary cell culture treated with inguinal adipose tissue conditioned medium (ATCM) prepared from HF-fed rats had greater (P < 0.05) proliferation compared with cultures treated with ATCM from LF-fed rats. Proliferative capacity of ATCM prepared from HF-fed rats was attenuated after the stripping of the medium of insulin-like growth factor I using an immunomagnetic bead separation system. These data are consistent with the concept that insulin-like growth factor I is involved in the paracrine regulation of adipogenesis.
Marques
B G
BG
Department of Foods and Nutrition, University of Georgia, Athens, Georgia 30602, USA.
Hausman
D B
DB
Latimer
A M
AM
Kras
K M
KM
Grossman
B M
BM
Martin
R J
RJ
D000273:Adipose Tissue / Q000473:pathology / Q000502:physiology*; D000818:Animals; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D017077:Culture Media, Conditioned; D004041:Dietary Fats / Q000008:administration & dosage*; D007334:Insulin-Like Growth Factor I / Q000502:physiology*; D051381:Rats
D017077:Culture Media, Conditioned; D004041:Dietary Fats; D007334:Insulin-Like Growth Factor I