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Differential expression of cyclin G2, cyclin-dependent kinase inhibitor 2C and peripheral myelin protein 22 genes during adipogenesis

Published online by Cambridge University Press:  17 April 2014

J. Zhang ,
Y. Suh ,
Y. M. Choi ,
J. Ahn ,
M. E. Davis  and
K. Lee
J. Zhang
Affiliation:
Department of Animal Sciences, The Ohio State University, Columbus, OH 43210, USA
Y. Suh
Affiliation:
Department of Animal Sciences, The Ohio State University, Columbus, OH 43210, USA
Y. M. Choi
Affiliation:
Department of Animal Sciences, The Ohio State University, Columbus, OH 43210, USA
J. Ahn
Affiliation:
Department of Animal Sciences, The Ohio State University, Columbus, OH 43210, USA Interdisciplinary Ph.D. Program in Nutrition, The Ohio State University, Columbus, OH 43210, USA
M. E. Davis
Affiliation:
Department of Animal Sciences, The Ohio State University, Columbus, OH 43210, USA
K. Lee*
Affiliation:
Department of Animal Sciences, The Ohio State University, Columbus, OH 43210, USA Interdisciplinary Ph.D. Program in Nutrition, The Ohio State University, Columbus, OH 43210, USA
*
† E-mail: [email protected]
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Abstract

Increase of fat cells (FCs) in adipose tissue is attributed to proliferation of preadipocytes or immature adipocytes in the early stage, as well as adipogenic differentiation in the later stage of adipose development. Although both events are involved in the FC increase, they are contrary to each other, because the former requires cell cycle activity, whereas the latter requires cell cycle withdrawal. Therefore, appropriate regulation of cell cycle inhibition is critical to adipogenesis. In order to explore the important cell cycle inhibitors and study their expression in adipogenesis, we adopted a strategy combining the Gene Expression Omnibus (GEO) database available on the NCBI website and the results of quantitative real-time PCR (qPCR) data in porcine adipose tissue. Three cell cycle inhibitors – cyclin G2 (CCNG2), cyclin-dependent kinase inhibitor 2C (CDKN2C) and peripheral myelin protein (PMP22) – were selected for study because they are relatively highly expressed in adipose tissue compared with muscle, heart, lung, liver and kidney in humans and mice based on two GEO DataSets (GDS596 and GDS3142). In the latter analysis, they were found to be more highly expressed in differentiating/ed preadipocytes than in undifferentiated preadipocytes in human and mice as shown respectively by GDS2366 and GDS2743. In addition, GDS2659 also suggested increasing expression of the three cell cycle inhibitors during differentiation of 3T3-L1 cells. Further study with qPCR in Landrace pigs did not confirm the high expression of these genes in adipose tissue compared with other tissues in market-age pigs, but confirmed higher expression of these genes in FCs than in the stromal vascular fraction, as well as increasing expression of these genes during in vitro adipogenic differentiation and in vivo development of adipose tissue. Moreover, the relatively high expression of CCNG2 in adipose tissue of market-age pigs and increasing expression during development of adipose tissue was also confirmed at the protein level by western blot analysis. Based on the analysis of the GEO DataSets and results of qPCR and Western blotting we conclude that all three cell cycle inhibitors may inhibit adipocyte proliferation, but promote adipocyte differentiation and hold a differentiated state by inducing and maintaining cell cycle inhibition. Therefore, their expression in adipose tissue is positively correlated with age and mature FC number. By regulating the expression of these genes, we may be able to control FC number, and, thus, reduce excessive fat tissue in animals and humans.

Keywords

cyclin G2 (CCNG2)22-kDa peripheral myelin protein (PMP22)cyclin-dependent inhibitor 2C (CDKN2C)adipocyteGEO datasets
Type
Full Paper
Information
animal , Volume 8 , Issue 5 , May 2014 , pp. 800 - 809
Copyright
© The Animal Consortium 2014 

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