Amyloid precursor protein (APP) affects global protein synthesis in dividing human cells

Anna Sobol, Paola Galluzzo, Shuang Liang, Brittany Rambo, Sylvia Skucha, Megan J. Weber, Sara Alani, Maurizio Bocchetta

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Hypoxic non-small cell lung cancer (NSCLC) is dependent on Notch-1 signaling for survival. Targeting Notch-1 by means of γ-secretase inhibitors (GSI) proved effective in killing hypoxic NSCLC. Post-mortem analysis of GSI-treated, NSCLC-burdened mice suggested enhanced phosphorylation of 4E-BP1 at threonines 37/46 in hypoxic tumor tissues. In vitro dissection of this phenomenon revealed that Amyloid Precursor Protein (APP) inhibition was responsible for a non-canonical 4E-BP1 phosphorylation pattern rearrangement-a process, in part, mediated by APP regulation of the pseudophosphatase Styx. Upon APP depletion we observed modifications of eIF-4F composition indicating increased recruitment of eIF-4A to the mRNA cap. This phenomenon was supported by the observation that cells with depleted APP were partially resistant to silvestrol, an antibiotic that interferes with eIF-4A assembly into eIF-4F complexes. APP downregulation in dividing human cells increased the rate of global protein synthesis, both cap- and IRES-dependent. Such an increase seemed independent of mTOR inhibition. After administration of Torin-1, APP downregulation and Mechanistic Target of Rapamycin Complex 1 (mTORC-1) inhibition affected 4E-BP1 phosphorylation and global protein synthesis in opposite fashions. Additional investigations indicated that APP operates independently of mTORC-1. Key phenomena described in this study were reversed by overexpression of the APP C-terminal domain. The presented data suggest that APP may be a novel regulator of protein synthesis in dividing human cells, both cancerous and primary. Furthermore, APP appears to affect translation initiation using mechanisms seemingly dissimilar to mTORC-1 regulation of cap-dependent protein synthesis. J. Cell. Physiol. 230: 1064-1074, 2015.

Original languageEnglish (US)
Pages (from-to)1064-1074
Number of pages11
JournalJournal of Cellular Physiology
Volume230
Issue number5
DOIs
StatePublished - May 1 2015
Externally publishedYes

Fingerprint

Amyloid beta-Protein Precursor
Cells
Phosphorylation
Proteins
Non-Small Cell Lung Carcinoma
Down-Regulation
Dissection
Amyloid Precursor Protein Secretases
Threonine
Protein C
Amyloid
Tumors
Tissue
Anti-Bacterial Agents
Messenger RNA
Survival

ASJC Scopus subject areas

  • Physiology
  • Clinical Biochemistry
  • Cell Biology

Cite this

Sobol, A., Galluzzo, P., Liang, S., Rambo, B., Skucha, S., Weber, M. J., ... Bocchetta, M. (2015). Amyloid precursor protein (APP) affects global protein synthesis in dividing human cells. Journal of Cellular Physiology, 230(5), 1064-1074. https://doi.org/10.1002/jcp.24835

Amyloid precursor protein (APP) affects global protein synthesis in dividing human cells. / Sobol, Anna; Galluzzo, Paola; Liang, Shuang; Rambo, Brittany; Skucha, Sylvia; Weber, Megan J.; Alani, Sara; Bocchetta, Maurizio.

In: Journal of Cellular Physiology, Vol. 230, No. 5, 01.05.2015, p. 1064-1074.

Research output: Contribution to journalArticle

Sobol, A, Galluzzo, P, Liang, S, Rambo, B, Skucha, S, Weber, MJ, Alani, S & Bocchetta, M 2015, 'Amyloid precursor protein (APP) affects global protein synthesis in dividing human cells', Journal of Cellular Physiology, vol. 230, no. 5, pp. 1064-1074. https://doi.org/10.1002/jcp.24835
Sobol, Anna ; Galluzzo, Paola ; Liang, Shuang ; Rambo, Brittany ; Skucha, Sylvia ; Weber, Megan J. ; Alani, Sara ; Bocchetta, Maurizio. / Amyloid precursor protein (APP) affects global protein synthesis in dividing human cells. In: Journal of Cellular Physiology. 2015 ; Vol. 230, No. 5. pp. 1064-1074.
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