Optical scatter changes at the onset of apoptosis are spatially associated with mitochondria

Robert M. Pasternack, Jing-Yi Zheng, Nada N. Boustany
2010 Journal of Biomedical Optics  
We combine optical scatter imaging ͑OSI͒ with fluorescence imaging of mitochondria to investigate the spatial relationship between the optical scatter signal and the location and structure of mitochondria within endothelial cells undergoing apoptosis. The OSI data corroborate our previous results showing a decrease in the intensity ratio of wide-to-narrow angle scatter ͓optical scatter image ratio ͑OSIR͔͒ during the first 60 min of apoptosis. In addition, we find here that this is followed by
more » ... increase in OSIR concurrent with mitochondrial fragmentation. We demonstrate that the dynamic change in light scattering is spatially associated with subcellular regions containing fluorescently labeled mitochondria, and remains absent from adjacent nonfluorescent regions dominated by other organelles. These results lend strong support to the hypothesis that mitochondria act as the source of the optical scatter changes measured at the onset of apoptosis.
doi:10.1117/1.3467501 pmid:20799771 fatcat:xzwt5jqvk5ghpge7yzdnywzvta