C/EBPalpha is required for differentiation of white, but not brown, adipose tissue

Proceedings of the National Academy of Sciences of the United States of America
H G LinhartG J Darlington

Abstract

The transcription factor CCAAT enhancer binding protein alpha (C/EBPalpha) is expressed at high levels in liver and adipose tissue. Cell culture studies show that C/EBPalpha is sufficient to trigger differentiation of preadipocytes into mature adipocytes, suggesting a central role for C/EBPalpha in the development of adipose tissue. C/EBPalpha knockout mice die within 7-12 h after birth. Defective gluconeogenesis of the liver and subsequent hypoglycemia contribute to the early death of these animals. This short life span impairs investigation of the development of adipose tissue in these mice. To improve the survival of C/EBPalpha-/- animals, we generated a transgenic line that expresses C/EBPalpha under the control of the albumin enhancer/promoter. This line was bred into the knockout strain to generate animals that express C/EBPalpha in the liver but in no other tissue. The presence of the transgene improved survival of C/EBPalpha-/- animals almost 3-fold. Transgenic C/EBPalpha-/- animals at 7 days of age show an absence of s.c., perirenal, and epididymal white fat despite excess lipid substrate in the serum, whereas brown adipose tissue is somewhat hypertrophied and shows minimal biochemical alterations. Interestingly, mamma...Continue Reading

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