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Applied Optics

Applied Optics


  • Vol. 42, Iss. 28 — Oct. 1, 2003
  • pp: 5765–5773

Optical forces for noninvasive cellular analysis

Mark M. Wang, Catherine A. Schnabel, Mirianas Chachisvilis, Rong Yang, Michael J. Paliotti, Laura A. Simons, Laura McMullin, Norbert Hagen, Kristie Lykstad, Eugene Tu, Luis M. Pestana, Sudipto Sur, Haichuan Zhang, William F. Butler, Ilona Kariv, and Philippe J. Marchand  »View Author Affiliations

Applied Optics, Vol. 42, Issue 28, pp. 5765-5773 (2003)

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A novel, noninvasive measurement technique for quantitative cellular analysis is presented that utilizes the forces generated by an optical beam to evaluate the physical properties of live cells in suspension. In this analysis, a focused, near-infrared laser line with a high cross-sectional intensity gradient is rapidly scanned across a field of cells, and the interaction of those cells with the beam is monitored. The response of each cell to the laser depends on its size, structure, morphology, composition, and surface membrane properties; therefore, with this technique, cell populations of different type, treatment, or biological state can be compared. To demonstrate the utility of this cell analysis platform, we evaluated the early stages of apoptosis induced in the U937 cancer cell line by the drug camptothecin and compared the results with established reference assays. Measurements on our platform show detection of cellular changes earlier than either of the fluorescence-based Annexin V or caspase assays. Because no labeling or additional cell processing is required and because accurate assays can be performed with a small number of cells, this measurement technique may find suitable applications in cell research, medical diagnostics, and drug discovery.

© 2003 Optical Society of America

OCIS Codes
(170.1530) Medical optics and biotechnology : Cell analysis
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation

Original Manuscript: April 8, 2003
Revised Manuscript: July 2, 2003
Published: October 1, 2003

Mark M. Wang, Catherine A. Schnabel, Mirianas Chachisvilis, Rong Yang, Michael J. Paliotti, Laura A. Simons, Laura McMullin, Norbert Hagen, Kristie Lykstad, Eugene Tu, Luis M. Pestana, Sudipto Sur, Haichuan Zhang, William F. Butler, Ilona Kariv, and Philippe J. Marchand, "Optical forces for noninvasive cellular analysis," Appl. Opt. 42, 5765-5773 (2003)

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