Paper Introduction 2016.01.12 by Md. Jahirul Islam.

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Paper Introduction 2016.01.12 by Md. Jahirul Islam

Cell Adhesion Behavior Switching by Photo and Electro-Chemical Manner Irreversible Control in Switching Campo A. et al. , Adv. Mater. 2011 , 23 , 3907 Mrksich M. et al. , J. Am. Chem. Soc. 2003 , 125 , 14994 Nakanishi J. et. al, Biomaterials 2012 , 33 , 2409

Cell Adhesion Behavior Switching by Thermoresponsive materials/ Bio-functionalized Azobenzene Reversible Control in Switching but lack of high spatial and temporal resolution completely reversible control of cell adhesion yet needed long time irradiation (more than 1h) Jiang , X. et. al, Angew. Chem. Int. Ed. 2009 , 48 , 4406 Griesser H. J. et. al , Biomaterials 2009 , 30 , 1827

Rapid Reversible Photoswitching of Cell Adhesion (this work) 47% cis A) Structure of the c(RGDfK)-azobenzene and covalent immobilization on glass. B) Mixed monolayer of polyethylene glycol (PEG) and c(RGDfK)-azobenzenes. UV illumination switches the azobenzene from the trans to the cis isomer and the c(RGDfK) headgroup (black circle) is immersed into the nonadhesive PEG background UV–vis spectra verify reversible photoswitching of the mixed monolayer

Reversible Photoswitching of Cell Adhesion Study by Cell culture Assay Fibroblasts (REF52wt) were seeded for 15 min onto either trans or cis Azobenzene surface (A) Cells (REF52 wt) before irradiation. (B) Cells after 30 sec irradiation with 365 nm. (C) Cells after irradiating 30 sec with 365 nm and another 30 sec with 440 nm. No change in cell conformation can be observed. Control Exp

Cantilever deflection is a measure of force acting on the cell Reversible Photoswitching of Cell Adhesion Study by Single Cell Force Spectroscopy (SCFS) Cell adhesion force measurement Cantilever Cantilever deflection is a measure of force acting on the cell Control Exp. Single-cell force spectroscopy control experiment on blank glass after irradiation at 440 nm and 365 nm (cell-surface contact time: 1 sec, ≥ 80 force-distance curves for each situation).

Conclusion Demonstration of efficient cell adhesion swithing at considerably shorter UV illumination SCFS-based approach demonstrates the true reversibility of cell adhesion switching

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