TY - JOUR
T1 - Continuous-flow enzyme assay on a microfluidic chip for monitoring glycerol secretion from cultured adipocytes
AU - Clark, Anna M.
AU - Sousa, Kyle M.
AU - Jennings, Colin
AU - MacDougald, Ormond A.
AU - Kennedy, Robert T.
N1 - Physiological studies frequently require maintaining cells or tissues in a controlled environment while detecting their physical, electrical, or chemical properties. Microfluidics may greatly facilitate such research by allowing creation of highly controlled cell-compatible environments integrated with sophisticated measurement and cell manipulation methods.
PY - 2009/3/15
Y1 - 2009/3/15
N2 - A dual-chip microfluidic platform that coupled perfusion of cultured adipocytes with on-line fluorescence-based enzyme assay was developed to monitor glycerol secretions in real time from cultured adipocytes. The perfusion cell chip, which could be reversibly sealed to allow reloading of cells and reuse of the chip, was shown by modeling to generate low shear stress on the cells under study. Effluent from the perfusion chip was pumped into an enzyme assay chip for monitoring of secretion from the cells. The on-line enzyme assay had a limit of detection (LOD) of 4 μM glycerol. The temporal resolution of the combined system for detecting changes in glycerol concentration was 90 s. The microfluidic device was used to continuously monitor glycerol secretion from murine 3T3-L1 adipocytes, grown and differentiated on glass cover-slips, for at least 2 h. An average basal glycerol concentration of 28 μM was detected in the effluent. Pharmacological treatment with a β-adrenergic agonist to stimulate lipolysis evoked a 3-fold increase in glycerol secretion followed by sustained release that was 40% higher than basal concentration. The ability to monitor changes in cellular secretion over time may provide insight into adipocyte metabolism and the dysregulation that occurs with obesity-related disorders.
AB - A dual-chip microfluidic platform that coupled perfusion of cultured adipocytes with on-line fluorescence-based enzyme assay was developed to monitor glycerol secretions in real time from cultured adipocytes. The perfusion cell chip, which could be reversibly sealed to allow reloading of cells and reuse of the chip, was shown by modeling to generate low shear stress on the cells under study. Effluent from the perfusion chip was pumped into an enzyme assay chip for monitoring of secretion from the cells. The on-line enzyme assay had a limit of detection (LOD) of 4 μM glycerol. The temporal resolution of the combined system for detecting changes in glycerol concentration was 90 s. The microfluidic device was used to continuously monitor glycerol secretion from murine 3T3-L1 adipocytes, grown and differentiated on glass cover-slips, for at least 2 h. An average basal glycerol concentration of 28 μM was detected in the effluent. Pharmacological treatment with a β-adrenergic agonist to stimulate lipolysis evoked a 3-fold increase in glycerol secretion followed by sustained release that was 40% higher than basal concentration. The ability to monitor changes in cellular secretion over time may provide insight into adipocyte metabolism and the dysregulation that occurs with obesity-related disorders.
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U2 - 10.1021/ac8026965
DO - 10.1021/ac8026965
M3 - Article
C2 - 19231843
SN - 0003-2700
VL - 81
SP - 2350
EP - 2356
JO - Analytical Chemistry
JF - Analytical Chemistry
IS - 6
ER -