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Detection and quantitation of low-abundant proteins with ECL Plex fluorescent Western blotting

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A model system, with two-fold serial dilutions of human apotransferrin and actin (not shown), was used to optimize system performance (Fig 2). Protein could be detected down to 1.2 pg, giving linearity over 3.6 orders of magnitude.

This result was also dependent on a membrane with low background fluorescence at wavelengths suitable for the fluorophores. Both a nitrocellulose membrane (Hybond ECL) and a newly developed PVDF membrane (Hybond–LFP) were found to meet these expectations.

Detection and quantitation of a phosphoprotein
Multiplex detection of proteins often suffers from cross-reactive signals between antibodies or dyes. This is addressed with the ECL Plex system through thorough optimization of components and protocols (Fig 3).

TGF-βis a potent growth factor stimulating a number of cellular responses including growth inhibition, cell differentiation, and apoptosis. The TGFβ–mediated phosphorylation of p38, measured in human T293 epithelial kidney cells, showed proportional increase when compared and quantitatively related to actin (Fig 4).


Conclusions
Western blotting is a well-established technique. The most common application is based on chemiluminescence, for example the GE Healthcare ECL™ product line (2, 3). As a new member in that family, ECL Plex adds a broader dynamic range and the ability to detect more than one protein on the same blot with high sensitivity and specificity. These features complement the chemiluminescence-based products, offering better quantitative data and shorter processing time. CyDye technology also offers longer lasting signals for storage and rescanning. Low-abundant proteins are readily detected in cell lysates, and activation of signal transduction pathways can
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