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Title: Synergy between trastuzumab and pertuzumab for human epidermal growth factor 2 (Her2) from colocalization: An in silico based mechanism
Authors: Fuentes, G.
Scaltriti, M.
Baselga, J.
Verma, C.S. 
Issue Date: 22-May-2011
Citation: Fuentes, G., Scaltriti, M., Baselga, J., Verma, C.S. (2011-05-22). Synergy between trastuzumab and pertuzumab for human epidermal growth factor 2 (Her2) from colocalization: An in silico based mechanism. Breast Cancer Research 13 (3) : -. ScholarBank@NUS Repository.
Abstract: Introduction: Human epidermal growth factor 2 (Her2), a receptor tyrosine kinase, is overexpressed in breast cancers. It has been successfully targeted by small molecule kinase inhibitors and by antibodies. Recent clinical data show a synergistic response in patients when two antibodies, trastuzumab and pertuzumab, are given in combination.Methods: This unexpected effect is rationalized through computer models and molecular dynamic simulations by hypothesizing that the two antibodies can co-localize on the same molecule of the Her2 extracellular domain.Results: Simulations suggest that the clinical synergism observed for the two antibodies arises partly from enhanced affinity that originates in cooperative interactions between these two antibodies when they are co-localized on Her2 and "clamp" it; this may inhibit dimerization and possibly higher oligomerizations with neighboring receptors. In the presence of trastuzumab, the receptor becomes highly plastic, especially domains I to III, and this appears to promote increased association with pertuzumab. Further, the presence of pertuzumab evokes novel interactions between the receptor and trastuzumab. Indeed, splicing out of this region in silico results in a big reduction in the interactions of the antibody with the receptor.Conclusions: If validated, these findings will bring about a new direction in the design of antibodies whereby different epitopes on the same antibody may be targeted to lead to synergistic/cooperative inhibition and contribute to generate more potent therapeutics and to increase clinical efficacy. © 2011 Fuentes et al.; licensee BioMed Central Ltd.
Source Title: Breast Cancer Research
ISSN: 14655411
DOI: 10.1186/bcr2888
Appears in Collections:Staff Publications

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