A new impedance based approach to test the activity of recombinant protein - Semaphorins as a test case

Anastasya Birger, Elazar Besser, Benjamin Reubinoff, Oded Behar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The biological activity of a recombinant protein is routinely measured using a bioassay such as an enzyme assay. However, many proteins have no enzymatic activity and in many cases it is difficult to devise a simple and reliable approach to test their activity. Semaphorins, Ephrins, Slits, Netrins or amylin-assisted proteins have numerous activities affecting many systems and cell types in the human body. Most of them are also able to induce rapid cytoskeleton changes at least in some cell types. We assumed therefore, that such proteins might be tested based on their ability to modulate the cytoskeleton. Here we tested a number of semaphorins in an impedance based label-free platform that allows for dynamic monitoring of subtle morphological and adhesive changes. This system has proved to be a very fast, sensitive and effective way to monitor and determine the activity of such proteins. Furthermore we showed that it is possible to customize a cell-protein system by transfecting the cells with specific receptors and test the cell response following the addition of the recombinant ligand protein. Since other protein families such as Ephrins and Netrins can also influence the cytoskeleton of some cells, this approach may be applicable to a large number of proteins.

Original languageAmerican English
Pages (from-to)453-457
Number of pages5
JournalEuropean Journal of Cell Biology
Issue number10
StatePublished - Oct 2015

Bibliographical note

Publisher Copyright:
© 2015 Elsevier GmbH.


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