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Time-resolved spectroscopy of mitochondria, cells, and rat tissues under normal and pathological conditions

In this study, the detailed dependence of the light scattering on the tissue architecture and intracellular composition was investigated. The reduced scattering coefficient ((mu) s') of isolated rat liver mitochondria, isolated liver cells and various rat tissues was measured at 780 nm by using time-resolved spectroscopy and a sample-substitution protocol. In a first part, extrapolations of the in vitro data to the in vivo situation showed that the mitochondrial compartment contributes for 73% of the scattering of the hepatocytes and about 100% of that of the whole liver. Finally, by analyzing different normal rat tissues and tumors, we have shown that the tissue (mu) s' is independent on the cell concentration in the tissue but is roughly proportional to the tissue mitochondrial content.