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Pfizer Global R&D, Alameda, California 94502
The effects of high-fat feeding on
the development of obesity were evaluated in intercellular adhesion
molecule-1 (ICAM-1) knockout and C57BL/6J (B6) male mice fed a high-fat
diet for
50 days. Serum and tissues were collected at baseline and
after 1, 11, and 50 days on the diet. After 11 days on the diet,
ICAM-1-deficient, but not B6, mice developed fatty livers and showed a
significant increase in inguinal fat pad weight. At day 50,
ICAM-1-deficient mice weighed less, and their adiposity index and
circulating leptin levels were significantly lower than those of B6
controls. To better understand the early differential response to the
diet, liver gene expression was analyzed at three time points by use of
Affymetrix GeneChips. In both strains, a similar pattern of gene
expression was detected in response to the high-fat diet. However,
sterol regulatory element-binding protein-1, apolipoprotein A4, and
adipsin mRNAs were significantly induced in ICAM-1-deficient livers,
suggesting that these genes and their associated pathways may be
involved in the acute diet response observed in the knockout mice.
intercellular adhesion molecule-1 knockout mice; obesity; dyslipidemia; steatosis; microarray
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