Modulation of obese gene expression in rat brown and white adipose tissues

• Published in: FEBS letters 1995-10, Vol.373 (2), p.131-134
• Main Authors: Moinat, Madelaine, Deng, Chengjun, Muzzin, Patrick, Assimacopoulos-Jeannet, Françoise, Seydoux, Josiane, Dulloo, Abdul G., Giacobino, Jean-Paul
• Format: Article
• Language: English
• Subjects: Adipose Tissue - metabolism; Adipose Tissue, Brown - metabolism; Animals; Base Sequence; BAT, brown adipose tissue; Cold; DNA Primers; Epididymis; Fast; Fasting; Gene Expression; Leptin; Male; Molecular Sequence Data; ob Gene; Obesity - genetics; Organ Specificity; Polymerase Chain Reaction; Protein Biosynthesis; Rat brown and white adipose tissue; Rats; Rats, Mutant Strains; Rats, Sprague-Dawley; RNA, Messenger - analysis; RNA, Messenger - biosynthesis; RT-PCR, reverse transcription-polymerase chain reaction; SNS, sympathetic nervous system; Starvation; VMH, ventromedial hypothalamus; WAT, white adipose tissue
• ISSN: 0014-5793; 1873-3468
• DOI: 10.1016/0014-5793(95)01030-I

The ob gene mRNA expression in rat brown adipose tissue (BAT) and epididymal white adipose tissue (WAT) was measured on Northern blots hybridized with a rat ob gene probe. The level of ob gene mRNA in BAT was about 40% of that in WAT. Fasting (36 h) or semi-starvation (10 days) decreased the ob gene mRNA level in both tissues by 62–68%, and cold exposure at 6°C (24 h) decreased it in BAT (−84%)_but not in WAT. Acute administration of the β 3-adrenergic agonist Ro 16-8714 decreased the ob gene mRNA level in BAT (−51%) and WAT (−28%) of lean Zucker rats and only in BAT (−74%) of obese falfa rats. This study demonstrates that, in the rat, the ob gene is not only expressed in WAT but also in BAT, and suggests that in these two tissues, the modulation of the ob gene expression might be more closely associated with known alterations in cell lipid content than with changes in sympathetic activity.