Abstract:
OBJECTIVE:The aim of this study was to determine whether ATP-binding cassette transporter A1 (ABCA1) was up-regulated by growth differentiation factor-15 (GDF-15) via the phosphoinositide 3-kinase (PI3K)/protein kinase Cζ (PKCζ)/specificity protein 1 (SP1) pathway in THP-1 macrophages. METHODS AND RESULTS:We investigated the effects of different concentrations of GDF-15 on ABCA1 expression in THP-1 macrophages. The results showed that GDF-15 dramatically increased cholesterol efflux and decreased cellular cholesterol levels. In addition, GDF15 increased ABCA1 mRNA and protein levels. The effects of GDF-15 on ABCA1 protein expression and cellular cholesterol efflux were abolished by wither inhibition or depletion of PI3K, PKCζ and SP1, respectively, suggesting the potential roles of PI3K, PKCζ and SP1 in ABCA1 expression. Taken together, GDF-15 appears to activate PI3K, PKCζ and SP1 cascade, and then increase ABCA1 expression, thereby promoting cholesterol efflux and reducing foam cell formation. CONCLUSION:Our results suggest that GDF-15 has an overall protective effect on the progression of atherosclerosis, likely through inducing ABCA1 expression via the PI3K/PKCζ/SP1 signaling pathway and enhancing cholesterol efflux.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Wu JF,Wang Y,Zhang M,Tang YY,Wang B,He PP,Lv YC,Ouyang XP,Yao F,Tan YL,Tang SL,Tang DP,Cayabyab FS,Zheng XL,Zhang DW,Zeng GF,Tang CKdoi
10.1016/j.bbrc.2014.01.048subject
Has Abstractpub_date
2014-02-14 00:00:00pages
325-31issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(14)00072-2journal_volume
444pub_type
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