Airborne cell analysis

Sabina Santesson

doi:10.1021/ac000140r

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Airborne cell analysis

2000-07-07

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DOI：10.1021/ac000140r

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Abstract

En 中文

A miniaturized analysis system for the study of living cells and biochemical reactions in microdroplets was developed. The technique utilizes an in-house-developed piezoelectric now-through droplet dispenser for precise reagent supply and an ultrasonic levitator for contactless sample handling. A few-cell study was performed with living primary adipocytes. Droplets (500 nL) containing 3-15 individual cells were acoustically levitated. The addition of beta-adrenergic agonists into the levitated droplet using the droplet dispenser stimulated adipocyte lipolysis, leading to free fatty acid release and a consequent pH decrease of the surrounding buffer. The addition of insulin antagonized lipolysis and hence also the decrease in pH, The changes in pH, i.e., the cell response in the droplet, were followed using a pH-dependent fluorophore continuously monitored by fluorescence imaging detection. An image analysis computer program was employed to calculate the droplet intensities. To counteract droplet evaporation, found to affect the fluorescence intensities, a separate dispenser was used to continually add water, thus keeping the droplet volume constant.

Keywords:

LASER-INDUCED FLUORESCENCE

ADRENAL-MEDULLARY CELLS

SINGLE NERVE-CELLS

CAPILLARY-ELECTROPHORESIS

LIQUID-CHROMATOGRAPHY

CATECHOLAMINES

LOCALIZATION

SECRETION

CYTOMETRY

NEURONS

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