MTor is a signaling hub in cell survival: A mass-spectrometry-based proteomics investigation


Tang Z., BAYKAL A. T., Gao H., Quezada H. C., Zhang H., Bereczki E., ...More

Journal of Proteome Research, vol.13, no.5, pp.2433-2444, 2014 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 13 Issue: 5
  • Publication Date: 2014
  • Doi Number: 10.1021/pr500192g
  • Journal Name: Journal of Proteome Research
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2433-2444
  • Keywords: mTor, cell survival, apoptosis, caspases, mitochondria
  • Istanbul Medipol University Affiliated: No

Abstract

mTor plays a central role in controlling protein homeostasis and cell survival. Recently, we have demonstrated that perturbations of mTor signaling are implicated in Alzheimer's disease (AD) and that mTor complex 1 (mTorC1) is involved in the formation of toxic phospho-tau. Therefore, we employed mass-spectrometry-based proteomics to identify specific protein expression changes in relation with cell survival in human neuroblastoma SH-SY5Y cells expressing genetically modified mTor. Cell death in SH-SY5Y cells was induced by moderate serum deprivation. Using flow cytometry we observed that up-regulated mTor complex 2 (mTorC2) increases the number of viable cells. By using a combination approach of proteomic and enrichment analysis we have identified several proteins (Thioredoxin-dependent peroxide reductase, Peroxiredoxin-5, Cofilin 1 (non-muscle), Annexin A5, Mortalin, and 14-3-3 protein zeta/delta) involved in mitochondrial integrity, apoptotosis, and pro-survival functions (caspase inhibitor activity and anti-apoptosis) that were significantly altered by mTor activity modulation. The major findings of this study are the implication of mTorC2 but not mTorC1 in cell viability modulation by activating the pro-survival machinery. Taken together, these results suggest that up-regulated mTorC2 might be playing an important role in promoting cell survival by suppressing the mitochondria-caspase-apoptotic pathway in vitro. © 2014 American Chemical Society.