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1 January 2007 Integrated multimodal microscopy, time-resolved fluorescence, and optical-trap rheometry: toward single molecule mechanobiology
Ramachandra R. Gullapalli, Tristan Tabouillot, Rishi Mathura, Jhanvi Dangaria, Peter J. Butler
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Journal of Biomedical Optics, Vol. 12, Issue 1, 014012 (January 2007). https://doi.org/10.1117/1.2673245
Abstract
Cells respond to forces through coordinated biochemical signaling cascades that originate from changes in single-molecule structure and dynamics and proceed to large-scale changes in cellular morphology and protein expression. To enable experiments that determine the molecular basis of mechanotransduction over these large time and length scales, we construct a confocal molecular dynamics microscope (CMDM). This system integrates total-internal-reflection fluorescence (TIRF), epifluorescence, differential interference contrast (DIC), and 3-D deconvolution imaging modalities with time-correlated single-photon counting (TCSPC) instrumentation and an optical trap. Some of the structures hypothesized to be involved in mechanotransduction are the glycocalyx, plasma membrane, actin cytoskeleton, focal adhesions, and cell-cell junctions. Through analysis of fluorescence fluctuations, single-molecule spectroscopic measurements [e.g., fluorescence correlation spectroscopy (FCS) and time-resolved fluorescence] can be correlated with these subcellular structures in adherent endothelial cells subjected to well-defined forces. We describe the construction of our multimodal microscope in detail and the calibrations necessary to define molecular dynamics in cell and model membranes. Finally, we discuss the potential applications of the system and its implications for the field of mechanotransduction.
©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)
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Ramachandra R. Gullapalli, Tristan Tabouillot, Rishi Mathura, Jhanvi Dangaria, and Peter J. Butler "Integrated multimodal microscopy, time-resolved fluorescence, and optical-trap rheometry: toward single molecule mechanobiology," Journal of Biomedical Optics 12(1), 014012 (1 January 2007). https://doi.org/10.1117/1.2673245
Published: 1 January 2007
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Cited by 42 scholarly publications and 2 patents.
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KEYWORDS
Diffusion
Luminescence
Fluorescence correlation spectroscopy
Molecules
Microscopy
Confocal microscopy
Time resolved spectroscopy
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