Cytotoxicity of prion protein-derived cell-penetrating peptides is modulated by pH but independent of amyloid formation
| Autor: | Marios S. Katsiotis, Ibrahim Chehade, Christy Maksoudian, Mazin Magzoub, Saeed M. Alhassan, Vineeth Mukundan, Maria C. Vogel |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Gene isoform Amyloid Cell Survival animal diseases Cell Biophysics Scrapie Cell-Penetrating Peptides Endosomes Protein Sorting Signals Biology Biochemistry Prion Proteins Mice 03 medical and health sciences Microscopy Electron Transmission Protein Domains Cell Line Tumor medicine Animals Humans Cytotoxicity Molecular Biology Infectivity Binding Sites Pinocytosis Cell Membrane Temperature Hydrogen-Ion Concentration nervous system diseases Kinetics 030104 developmental biology medicine.anatomical_structure Membrane Liposomes Toxicity Cattle Lysosomes Peptides HeLa Cells |
| Zdroj: | Archives of Biochemistry and Biophysics. 613:31-42 |
| ISSN: | 0003-9861 |
| DOI: | 10.1016/j.abb.2016.11.001 |
| Popis: | Prion diseases are associated with conversion of cellular prion protein (PrPC) into an abnormally folded and infectious scrapie isoform (PrPSc). We previously showed that peptides derived from the unprocessed N-termini of mouse and bovine prion proteins, mPrP1-28 and bPrP1-30, function as cell-penetrating peptides (CPPs), and destabilize model membrane systems, which could explain the infectivity and toxicity of prion diseases. However, subsequent studies revealed that treatment with mPrP1-28 or bPrP1-30 significantly reduce PrPSc levels in prion-infected cells. To explain these seemingly contradictory results, we correlated the aggregation, membrane perturbation and cytotoxicity of the peptides with their cellular uptake and intracellular localization. Although the peptides have a similar primary sequence, mPrP1-28 is amyloidogenic, whereas bPrP1-30 forms smaller oligomeric or non-fibrillar aggregates. Surprisingly, bPrP1-30 induces much higher cytotoxicity than mPrP1-28, indicating that amyloid formation and toxicity are independent. The toxicity is correlated with prolonged residence at the plasma membrane and membrane perturbation. Both ordered aggregation and toxicity of the peptides are inhibited by low pH. Under non-toxic conditions, the peptides are internalized by lipid-raft dependent macropinocytosis and localize to acidic lysosomal compartments. Our results shed light on the antiprion mechanism of the prion protein-derived CPPs and identify a potential site for PrPSc formation. |
| Databáze: | OpenAIRE |
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