Lipid synthesis is promoted by hypoxic adipocyte-derived exosomes in 3T3-L1 cells

Soichi Sano, Yasukatsu Izumi, Takehiro Yamaguchi, Takanori Yamazaki, Masako Tanaka, Masayuki Shiota, Mayuko Osada-Oka, Yasuhiro Nakamura, Min Wei, Hideki Wanibuchi, Hiroshi Iwao, Minoru Yoshiyama

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Hypoxia occurs within adipose tissues as a result of adipocyte hypertrophy and is associated with adipocyte dysfunction in obesity. Here, we examined whether hypoxia affects the characteristics of adipocyte-derived exosomes. Exosomes are nanovesicles secreted from most cell types as an information carrier between donor and recipient cells, containing a variety of proteins as well as genetic materials. Cultured differentiated 3T3-L1 adipocytes were exposed to hypoxic conditions and the protein content of the exosomes produced from these cells was compared by quantitative proteomic analysis. A total of 231 proteins were identified in the adipocyte-derived exosomes. Some of these proteins showed altered expression levels under hypoxic conditions. These results were confirmed by immunoblot analysis. Especially, hypoxic adipocyte-released exosomes were enriched in enzymes related to de novo lipogenesis such as acetyl-CoA carboxylase, glucose-6-phosphate dehydrogenase, and fatty acid synthase (FASN). The total amount of proteins secreted from exosomes increased by 3-4-fold under hypoxic conditions. Moreover, hypoxia-derived exosomes promoted lipid accumulation in recipient 3T3-L1 adipocytes, compared with those produced under normoxic conditions. FASN levels were increased in undifferentiated 3T3-L1 cells treated with FASN-containing hypoxic adipocytes-derived exosomes. This is a study to characterize the proteomic profiles of adipocyte-derived exosomes. Exosomal proteins derived from hypoxic adipocytes may affect lipogenic activity in neighboring preadipocytes and adipocytes.

Original languageEnglish
Pages (from-to)327-333
Number of pages7
JournalBiochemical and Biophysical Research Communications
Volume445
Issue number2
DOIs
Publication statusPublished - 2014 Mar 7

Keywords

  • Adipocytes
  • De novo lipogenesis
  • Exosome
  • Hypoxia
  • Proteomic analysis

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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  • Cite this

    Sano, S., Izumi, Y., Yamaguchi, T., Yamazaki, T., Tanaka, M., Shiota, M., Osada-Oka, M., Nakamura, Y., Wei, M., Wanibuchi, H., Iwao, H., & Yoshiyama, M. (2014). Lipid synthesis is promoted by hypoxic adipocyte-derived exosomes in 3T3-L1 cells. Biochemical and Biophysical Research Communications, 445(2), 327-333. https://doi.org/10.1016/j.bbrc.2014.01.183