Abstract
Phospholipids in the cell membranes of all eukaryotic cells contain phosphatidyl choline (PC) as the headgroup. Here we show that hyperbranched polyglycerols (HPGs) decorated with the ’PC-inverse’ choline phosphate (CP) in a polyvalent fashion can electrostatically bind to a variety of cell membranes and to PC-containing liposomes, the binding strength depending on the number density of CP groups per macromolecule. We also show that HPG–CPs can cause cells to adhere with varying affinity to other cells, and that binding can be reversed by subsequent exposure to low molecular weight HPGs carrying small numbers of PCs. Moreover, PC-rich membranes adsorb and rapidly internalize fluorescent HPG–CP but not HPG–PC molecules, which suggests that HPG–CPs could be used as drug-delivery agents. CP-decorated polymers should find broad use, for instance as tissue sealants and in the self-assembly of lipid nanostructures.
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Acknowledgements
Financial support from Canadian Institutes of Health Research (CIHR), Canadian Blood Services (CBS), Canada Foundation for Innovation (CFI), and Michael Smith Foundation for Health Research (MSFHR) are gratefully acknowledged. The authors thank the Laboratory of Molecular Biophysics Macromolecular Hub at the University of British Columbia (UBC) Center for Blood Research for the use of their research facilities. These facilities are supported in part by grants from the Canada Foundation for Innovation and the Michael Smith Foundation for Health Research. J.N.K. acknowledges the New Investigator award from CIHR and CBS, as well as the Career Investigator Scholar award from MSFHR. The authors acknowledge Derrick Horne (UBC Bioimaging Facility) for technical assistance.
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X.Y., J.N.K. and D.E.B. conceived, designed and co-wrote the paper. X.Y., Z.L., I.C., S.H., W.C. and R.K.K performed the experiments. J.J. helped to analyse the data. All authors discussed the results and commented on the manuscript.
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Yu, X., Liu, Z., Janzen, J. et al. Polyvalent choline phosphate as a universal biomembrane adhesive. Nature Mater 11, 468–476 (2012). https://doi.org/10.1038/nmat3272
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DOI: https://doi.org/10.1038/nmat3272
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