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Prolactin regulatory element-binding protein is involved in suppression of the adiponectin gene in vivo

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Abstract

Purpose

Prolactin regulatory element-binding protein (PREB), a member of the WD-repeat protein family, has been recognized as a transcriptional factor that regulates prolactin promoter activity in the anterior pituitary of rats. PREB is expressed not only in the pituitary but also in various other tissues, including the adipose tissue. Previous studies have shown that PREB acts as a transcriptional regulator and suppresses the expression of the adiponectin gene in cultured 3T3L1 preadipocytes. The aim of this study was to further examine the potential role of PREB in adipose tissue in vivo.

Methods

Transgenic mice that overexpressing PREB (PREB transgenic mice) were generated. Insulin resistance was evaluated in PREB transgenic mice using glucose and insulin tolerance tests. Adiponectin expression in the adipose tissue was examined by western blot analysis and quantitative polymerase chain reaction (qPCR). The expression levels of stearoyl-CoA desaturase (Scd) and adiponectin receptor 2(ADIPOR2) were quantified by qPCR.

Results

Glucose and insulin tolerance tests revealed insulin resistance in PREB transgenic mice. Serum adiponectin and leptin concentrations were decreased. Adiponectin gene expression was decreased in the adipose tissue, which was confirmed by the downregulation of the adiponectin-dependent hepatic Scd gene and upregulation of the ADIPOR2 gene in the liver of PREB transgenic mice. We also found that pioglitazone, an agonist for the peroxisome proliferator-activated receptor-r, improved the insulin resistance in the PREB transgenic mice after a 10-day feeding period.

Conclusions

These results demonstrated that PREB might contribute to the regulation of adiponectin gene expression in vivo.

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Acknowledgements

We thank Miss. Azusa Sugimoto and Dr. Yu Guan for their technical assistance. This work was supported by grants-in-aid from the Ministry of Education, Culture, Sports, Science and Technology, Japan. (to H.I, K.M. 24591352, 15K09415).

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Authors and Affiliations

  1. Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, ikenobe, Miki-CHO, 761-0793, Kagawa, Japan

    X. Z. Zhang, H. Imachi, J. Y. Lyu, K. Fukunaga, S. Sato, T. Ibata, T. Kobayashi, T. Yoshimoto, F. Kikuchi, T. Dong & K. Murao

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  1. X. Z. Zhang
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Correspondence to X. Z. Zhang.

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The authors declare that they have no conflicts of interest.

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Procedures for the maintenance and use of animals were approved by the Ethics Review Board of Kagawa University, Kagawa, Japan, and all applicable institutional and governmental guidelines concerning the ethical use of animals were followed.

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Zhang, X.Z., Imachi, H., Lyu, J.Y. et al. Prolactin regulatory element-binding protein is involved in suppression of the adiponectin gene in vivo. J Endocrinol Invest 40, 437–445 (2017). https://doi.org/10.1007/s40618-016-0589-3

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  • DOI: https://doi.org/10.1007/s40618-016-0589-3

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