A new preadipocyte cell line, AP-18, established from adult mouse adipose tissue

Hideyuki Doi, Nakui Masaki, Hitoshi Takahashi, Hiromichi Komatsu, Keisei Fujimori, Susumu Satomi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Establishing preadipocyte cell lines from mature adipose tissues could help lead to a better understanding of adipogenesis, We have established a unique preadipocyte cell line, AP-18, derived from the subepidermal layer of ear skin from an adult C3H/HeM mouse. AP-18 cells exhibit fibroblast-like morphology, slow growth, and contact inhibition. The doubling time of AP-18 cells is 50-60 h, which is about 2-fold longer than that of well-known 3T3-L1 cells derived from mouse embryos. A small population of AP-18 cells spontaneously differentiates into adipocytes by 8 days after confluence, as judged by the accumulation of triglyceride droplets. Treatment of confluent AP-18 preadipocytes with adipogenic agents, containing dexamethasone, 3-methyl-1-isobutylxanthine, and insulin, increased triglyceride contents about 5-fold compared to the contents in untreated cells. We also analyzed mRNA expression profiles for key transcription factors involved in adipocyte differentiation, peroxisome proliferator-activated receptor (PPAR)γ and the CCAAT/enhancer binding protein (C/EBP) family, and for differentiation markers, aP2, adipocyte-specific fatty acid-binding protein and adipsin, adipocyte-specific serine protease. AP-18 preadipocytes express mRNAs for C/EBPβ, C/EBPα, PPARγ, and aP2 before differentiation, but not adipsin mRNA. Expression of aP2 mRNA was increased in fully differentiated AP-18 cells. Likewise, expression of adipsin mRNA was increased after induced differentiation of AP-18 cells and reached the highest level in fully differentiated adipocytes. Thus, differentiation of AP-18 cells is associated with the increased expression of aP2 and adipsin mRNAs. The newly established AP-18 cell line provides a useful model for investigating adipocyte differentiation and adipogenesis.

Original languageEnglish
Pages (from-to)209-216
Number of pages8
JournalTohoku Journal of Experimental Medicine
Issue number3
Publication statusPublished - 2005 Nov


  • Adipogenesis
  • Differentiation
  • Mouse
  • Preadipocyte
  • Proliferation

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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