Generation of mature fat pads in vitro and in vivo utilizing 3-D long-term culture of 3T3-L1 preadipocytes

Experimental Cell Research
Claudia FischbachTorsten Blunk

Abstract

Tissue-inherent factors such as cell-cell and cell-extracellular matrix interactions are regarded to exert a potentially large impact on adipogenesis as well as on secretory functions of adipose tissue. However, an appropriate 3-D adipogenesis model useful for addressing such interactions is still lacking. In this study, using tissue-engineering techniques, we demonstrate for the first time the development of coherent fat pads consisting of unilocular signet-ring cells in vitro. The constructs were generated by differentiating 3T3-L1 preadipocytes on 3-D polymeric scaffolds for either 9, 21, or 35 days in vitro. Only long-term culture yielded uniform tissues histologically comparable to native fat. Light and scanning electron microscopy provided direct evidence of 3-D tissue coherence and cell-cell contact in a tissue context, which was in strong contrast to conventional 2-D monolayer culture. Further differences between the two culture systems included enhanced secretion of leptin in 3-D tissue culture and differences in laminin expression (mRNA and protein level). Increase of triglyceride content over culture time and mRNA expression of other adipocyte genes, such as PPARgamma and Glut-4, were found to be similar. Implantatio...Continue Reading

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