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Title: Protein receptor-independent plasma membrane remodeling by HAMLET: a tumoricidal protein-lipid complex
Authors: Nadeem, Aftab
Sanborn, Jeremy
Gettel, Douglas L.
Ho, James C. S.
Pedersen, Stine Falsig
Lam, Matti
Rydström, Anna
Ngassam, Viviane N.
Klausen, Thomas Kjær
Parikh, Atul N.
Svanbor, Catharina
Issue Date: 2015
Source: Nadeem, A., Sanborn, J., Gettel, D. L., Ho, J. C. S., Rydström, A., Ngassam, V. N., et al. (2015). Protein receptor-independent plasma membrane remodeling by HAMLET: a tumoricidal protein-lipid complex. Scientific Reports, 5, 16432-.
Series/Report no.: Scientific Reports
Abstract: A central tenet of signal transduction in eukaryotic cells is that extra-cellular ligands activate specific cell surface receptors, which orchestrate downstream responses. This ‘’protein-centric” view is increasingly challenged by evidence for the involvement of specialized membrane domains in signal transduction. Here, we propose that membrane perturbation may serve as an alternative mechanism to activate a conserved cell-death program in cancer cells. This view emerges from the extraordinary manner in which HAMLET (Human Alpha-lactalbumin Made LEthal to Tumor cells) kills a wide range of tumor cells in vitro and demonstrates therapeutic efficacy and selectivity in cancer models and clinical studies. We identify a ‘’receptor independent” transformation of vesicular motifs in model membranes, which is paralleled by gross remodeling of tumor cell membranes. Furthermore, we find that HAMLET accumulates within these de novo membrane conformations and define membrane blebs as cellular compartments for direct interactions of HAMLET with essential target proteins such as the Ras family of GTPases. Finally, we demonstrate lower sensitivity of healthy cell membranes to HAMLET challenge. These features suggest that HAMLET-induced curvature-dependent membrane conformations serve as surrogate receptors for initiating signal transduction cascades, ultimately leading to cell death.
ISSN: 2045-2322
DOI: 10.1038/srep16432
Schools: School of Materials Science & Engineering 
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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