C/EBPZ modulates the differentiation and proliferation of preadipocytes.

BACKGROUND/OBJECTIVES This study investigated the functions of CCAAT/enhancer-binding protein zeta (C/EBPZ; Gene ID: 10153) in adipose tissue. SUBJECTS/METHODS Bioinformatics analysis were used to study the expression pattern of C/EBPZ in human adipose tissue. The expression and function of C/EBPZ in adipose tissue were further studied using chicken as animal model in vivo and in vitro. RESULTS The human C/EBPZ transcripts were greater and more stable in subcutaneous adipose tissue than in visceral adipose tissue (P < 0.01), and they were increased with age in adipose tissue (P < 0.05). In addition, the chicken C/EBPZ transcripts (C/EBPZ /ACTB) of visceral (abdominal) adipose tissue were significantly different between fat and lean broilers and decreased with age during development (P < 0.01). RNA-seq analysis showed that the C/EBPZ overexpression associated with adipose tissue development and DNA replication in chicken preadipocytes (P < 0.05). Additionally, overexpression of chicken C/EBPZ inhibited preadipocytes differentiation and promoted preadipoytes proliferation in vitro (P < 0.05). In addition, C/EBPZ overexpression suppressed the promoter activities of PPARγ, C/EBPα, FASN and LPL, and promoted the promoter activities of GATA2 and FABP4 in chicken preadipocytes (P < 0.05). CONCLUSIONS C/EBPZ modulated the differentiation and proliferation of preadipocytes, and it might be a new negative regulator of adipogenesis.