Abstract
Among non-invasive cell delivery strategies, cell-penetrating peptide (CPP) vectors represent interesting new tools. To get fundamental knowledge about the still debated internalisation mechanisms of these peptides, we modified the membrane content of cells, typically by hydrolysis of sphingomyelin or depletion of cholesterol from the membrane outer leaflet. We quantified and visualised the effect of these viable cell surface treatments on the internalisation efficiency of different CPPs, among which the most studied Tat, R9, penetratin and analogues, that all carry the N-terminal biotin-Gly4 tag cargo. Under these cell membrane treatments, only penetratin and R6W3 underwent a massive glycosaminoglycan (GAG)-dependent entry in cells. Internalisation of the other peptides was only slightly increased, similarly in the absence or the presence of GAGs for R9, and only in the presence of GAGs for Tat and R6L3. Ceramide formation (or cholesterol depletion) is known to lead to the reorganisation of membrane lipid domains into larger platforms, which can serve as a trap and cluster receptors. These results show that GAG clustering, enhanced by formation of ceramide, is efficiently exploited by penetratin and R6W3, which contains Trp residues in their sequence but not Tat, R9 and R6L3. Hence, these data shed new lights on the differences in the internalisation mechanism and pathway of these peptides that are widely used in delivery of cargo molecules.
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Acknowledgments
Support for this research was provided by the Université Pierre et Marie Curie (UPMC; Sorbonne Universités), by ANR BLAN2010-ParaHP (postdoctoral position for M.P.), by the École Normale Supérieure (ENS), the Centre National de la Recherche Scientifique (CNRS), and the French Ministère de l’Enseignement Supérieur et de la Recherche (PhD fellowship for C.B.).
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The authors declare that they have no conflict of interest.
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Bechara, C., Pallerla, M., Burlina, F. et al. Massive glycosaminoglycan-dependent entry of Trp-containing cell-penetrating peptides induced by exogenous sphingomyelinase or cholesterol depletion. Cell. Mol. Life Sci. 72, 809–820 (2015). https://doi.org/10.1007/s00018-014-1696-y
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DOI: https://doi.org/10.1007/s00018-014-1696-y