Non-invasive glucose monitoring by NAD(P)H autofluorescence spectroscopy in fibroblasts and adipocytes: a model for skin glucose sensing.

Evans, Nicholas D., Gnudi, Luigi, Rolinski, Olaf J., Birch, David J.S. and Pickup, John C. (2003) Non-invasive glucose monitoring by NAD(P)H autofluorescence spectroscopy in fibroblasts and adipocytes: a model for skin glucose sensing. Diabetes Technology & Therapeutics, 5 (5), 807-816. (doi:10.1089/152091503322527012.). (PMID:14633346)

Abstract

The aim of this study was to develop an in vitro cell-culture model of skin-component cells to test the hypothesis that glucose can be monitored non-invasively by measuring NAD(P)H-related fluorescence changes in tissues. 3T3-L1 fibroblasts and adipocytes were grown in culture, and the response to added glucose was assessed by changes in steady-state autofluorescence at 400-500 nm [excitation at 340 nm, an index of NAD(P)H]. We also studied glucose-related fluorescence changes in cells stained with the mitochondrial marker, rhodamine-123. Fibroblasts and adipocytes showed glucose-dependent increases in autofluorescence with both short- and long-term exposure. Spectral properties indicated that the fluorescence was due to NAD(P)H production. With 5-h exposure to glucose, the maximal response was at 10-15 mmol/L glucose. Cells stained with the fluorescent mitochondrial marker, rhodamine-123, showed an immediate and marked decrease in fluorescence when exposed to glucose. We conclude that glucose can be sensed non-invasively by cellular fluorescence changes in fibroblasts and adipocytes. This is a model for the further exploration of fluorescence-based non-invasive metabolic monitoring in human diabetes.

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Contributors

Author: Nicholas D. Evans

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