Fully automated microchip system for the detection of quantal exocytosis from single and small ensembles of cells

Christer Spégel, Arto Heiskanen, Simon Pedersen, Jenny Emnéus, Tautgirdas Ruzgas, Rafael Jozef Taboryski

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A lab-on-a-chip device that enables positioning of single or small ensembles of cells on an aperture in close proximity to a mercaptopropionic acid (MPA) modified sensing electrode has been developed and characterized. The microchip was used for the detection of Ca2+-dependent quantal catecholamine exocytosis from single as well as small assemblies of rat pheochromocytoma (PC12) cells. The frequency of events increased considerably upon depolarization of the PC12 cell membrane using a high extracelluar concentration of potassium. The number of recorded events could be correlated with the number of cells immobilized on the electrode. Quantal characteristics, such as the number of released molecules per recorded event, are equivalent to data obtained using conventional carbon fiber microelectrodes. The detection sensitivity of the device allows for the detection of less than 10 000 dopamine molecules in a quantal release. The distribution of peak rise-time and full width at half maximum was constant during measurement periods of several minutes demonstrating the stability of the MPA modified surface.
    Original languageEnglish
    JournalLab on a Chip
    Volume8
    Issue number2
    Pages (from-to)323-329
    ISSN1473-0197
    DOIs
    Publication statusPublished - 2008

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