Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10756061 | Biochemical and Biophysical Research Communications | 2014 | 7 Pages |
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.
Keywords
ACCFBSHSP72G6PDACNExosomeGAPDHHsc70heat shock cognate 71 kDa proteinHIF-1αHspAdipocytesde novo lipogenesisAcetonitrileacetyl-CoA carboxylasefatty acid synthaseProteomic analysisfetal bovine serumhypoxia-inducible factor-1αFasnwild-typeHypoxiaHeat shock proteinglucose-6-phosphate dehydrogenaseglyceraldehyde-phosphate dehydrogenase
Related Topics
Life Sciences
Biochemistry, Genetics and Molecular Biology
Biochemistry
Authors
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,