Acta Biochimica et Biophysica Sinica Advance Access originally published online on October 8, 2009
Acta Biochimica et Biophysica Sinica 2009 41(11):910-921; doi:10.1093/abbs/gmp085
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Quantitative analysis of secretome from adipocytes regulated by insulin
1 Key Laboratory of Systems Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Graduate School, Chinese Academy of Sciences, Shanghai 200031, China
2 Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Graduate School, Chinese Academy of Sciences, Shanghai 200031, China
* Correspondence address. Tel: +86-21-54921113; Fax: +86-21-54921011; E-mail: kliao{at}sibs.ac.cn (K.L.); Tel: +86-21-54920170; E-mail: zr{at}sibs.ac.cn (R.Z.)
 |
Abstract |
|---|
Adipocyte is not only a central player involved in storage and release of energy, but also in regulation of energy metabolism in other organs via secretion of peptides and proteins. During the pathogenesis of insulin resistance and type 2 diabetes, adipocytes are subjected to the increased levels of insulin, which may have a major impact on the secretion of adipokines. We have undertaken cleavable isotope-coded affinity tag (cICAT) and label-free quantitation approaches to identify and quantify secretory factors that are differentially secreted by 3T3-L1 adipocytes with or without insulin treatment. Combination of cICAT and label-free results, there are 317 proteins predicted or annotated as secretory proteins. Among these secretory proteins, 179 proteins and 53 proteins were significantly up-regulated and down-regulated, respectively. A total of 77 reported adipokines were quantified in our study, such as adiponectin, cathepsin D, cystatin C, resistin, and transferrin. Western blot analysis of these adipokines confirmed the quantitative results from mass spectrometry, and revealed individualized secreting patterns of these proteins by increasing insulin dose. In addition, 240 proteins were newly identified and quantified as secreted proteins from 3T3-L1 adipocytes in our study, most of which were up-regulated upon insulin treatment. Further comprehensive bioinformatics analysis revealed that the secretory proteins in extracellular matrix-receptor interaction pathway and glycan structure degradation pathway were significantly up-regulated by insulin stimulation.
Keywords secretome; adipocyte; insulin; cICAT; label-free
Received: June 2, 2009; Accepted: July 6, 2009
These authors contributed equally to this work.