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Why Fluorescent EliSpot?
The EliSpot assay is known to be one of
the most sensitive cellular immunoassay available, allowing the detection
of cytokine producing T-cells even at the single cell level. So far, one
limitation in EliSpot technology has been the lack to detect T-cells which
simultaneously produce multiple cytokines.
To overcome this problem
researches have begun to develop EliSpot assays based on fluorescent
labeling. Detection of multiple cytokines expressing lymphocytes such as
double IFNgamma-IL-2 producing T-cells with this new EliSpot
(FluoroSpot)-technology could provide additional and new informations
regarding the clinical outcome in patients with various viral infections
and other questions.
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advanced TH1/TH2 analysis (e.g.
Interferon vs. IL2 and IL10)
more detailed analysis of T
cell subpopulations
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improved characterisation of
shifted immune response in various infectious diseases
IFN-assay done with traditional enzymatic (left) and with fluorescent-based EliSpot (right) and analysed with the AID EliSpot software. Sensitivity of both assays is nearly the same, as shown by the total number of spots in both wells.
Why AID iSpot?
AID has developed an unique EliSpot device
capable to analyse fluorescent- as well as traditional enzymatic-based
EliSpot assays.
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Since commercially available
validated fluorescent-based EliSpot assays are still in development but
should be on the market in 2008, it is reasonable to use a
hybrid-technolgy, which allows to interprete enzymatic- and
fluorescent-based assays with only one device.
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The new AID iSpot Reader
is still as fast as the original AID Readers and completely
interpretes a 96-well fluorescent plate within 6 –7 minutes.
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The AID iSpot Reader can switch between both approaches without hardware changes and
without loss of sensitivity in the assay analysis.
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The sophisticated new
overlay-technology allows for detailed interpretation of
double-expressing T-cells in every well. The adapted fluorescent
interpretation software especially facilitates working with these
subtypes of cells.
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Simultaneously detection of
multiple fluorescent dyes with universal filters or high-sensitivity
detection of two fluorophores with specific filters is supported by the
software.
Fluorescent-based two-color IFN/Il2-assay interpreted with the AID EliSpot software: Although there are only two IL2 secreting cells (image A, Cy3), both spots could be found in the IFN image as well (image B, FITC) and are therefore pointed out in the overlaid image C. Note that the artefact (art.) seen in image A (Cy3) is not interpreted as a spot by the software.
On the following pages you will find information on the AID
Elispot Reader Systems and the Elispot assays developed and produced by
AID.
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