Photonic force microscopy of local tension at cell surface focal adhesions

François Bordeleau; Judicaël Bessard; Normand Marceau; Yunlong Sheng

doi:10.1117/12.706573

8 September 2006 Photonic force microscopy of local tension at cell surface focal adhesions

François Bordeleau, Judicaël Bessard, Normand Marceau, Yunlong Sheng

Proceedings Volume 6343, Photonics North 2006; 63430A (2006) https://doi.org/10.1117/12.706573
Event: Photonics North 2006, 2006, Quebec City, Canada

Abstract

The ability of cells to sustain mechanical stress is essential. It is however not very well understood how tension is expressed from the inside of the cell to the exterior. Here we show that these forces can be measured by photonic force microscopy (PFM), which is able to apply a force to cells and to probe their response to the physical stress. Our setup consists of an inverted microscope coupled with an optical trap from a 5W ND:YVO₄ fiber laser. Forces are applied to the cell by the trap through a 5μm polystyrene bead coated with fibronectin, pre-incubated with cells to allow bead attachment and creation of focal adhesions. The reaction of the cell is monitored by sensing the position of the bead relative to the trap center by a quadrant photodiode, when the bead is in an equilibrium state between the photonics forces and the membrane elasticity and cell stiffness. The detection system is calibrated using a piezo nano-positioner and thermal noise analysis. We observed increased deformation of H4 cells treated with cytocholasin D, which disrupts the actin microfilaments. This observation is correlated to an overall decrease in the force by the photonics force microscope. Our results suggest that cell stiffness can be assessed by the PFM, which allows quantification of a tension within cells with sufficient precision.

Citation Download Citation

François Bordeleau, Judicaël Bessard, Normand Marceau, and Yunlong Sheng "Photonic force microscopy of local tension at cell surface focal adhesions", Proc. SPIE 6343, Photonics North 2006, 63430A (8 September 2006); https://doi.org/10.1117/12.706573

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available