Viability studies of optically trapped T-cells

Niall McAlinden, David Gavin Glass, Owain Millington, Amanda Wright

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

5 Citations (Scopus)


We present a viability study of optically trapped live T cell hybridomas. T cells form an important part of the adaptive immune response system which is responsible for fighting particular pathogens or diseases. The cells of interest were directly trapped by a laser operating at a wavelength of 1064 nm and their viability measured as a function of time. Cell death was monitored using an inverted fluorescent microscope to observe the uptake by the cell of the fluorescent dye propidium iodide. Studies were undertaken at various laser powers and beam profiles. There is a growing interest in optically trapping immune cells and this is the first study that investigates the viability of a T cell when trapped using a conventional optical trapping system. In such experiments it is crucial that the T cell remains viable and trapping the cell directly means that any artefacts due to a cell-bead interface are removed. Our motivation behind this experiment is to use optical tweezers to gain a greater understanding of the interaction forces between T cells and antigen presenting cells. Measuring these interactions has become important due to recent theories which indicate that the strength of this interaction may underlie the activation of the T-cell and subsequent immune response.
Original languageEnglish
Title of host publicationOptical Trapping and Optical Micromanipulation VIII
Publication statusPublished - 2011
EventSPIE Optics and Photonics - San Diego, United States
Duration: 21 Aug 201125 Aug 2011


ConferenceSPIE Optics and Photonics
Country/TerritoryUnited States
CitySan Diego


  • T cells
  • propidium iodide
  • viability
  • optical trapping
  • fluorescence microscopy


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