A High-Throughput Platform for the Rapid Quantification
of Phosphorylated Histone H2AX in Cell Lysates Based on Microplate
Electrochemiluminescence Immunosensor Array
Sensitive
detection of phosphorylated histone H2AX (γH2AX)
in cells as a biomarker of DNA double-strand breaks has great significance
in the field of molecular toxicology and life science research. However,
current γH2AX detection methods require labor- and time-consuming
steps. Here, for the first time, we designed a simple electrochemiluminescence
(ECL) immunoassay integrated with a microplate-based sensor array
to realize sensitive and high-throughput detection of γH2AX
in cell lysates. Under the optimized conditions, this ECL immunosensor
array could linearly respond to γH2AX concentrations in the
range from 2 × 102 to 1 × 105 pg/mL.
In addition, our approach possessed excellent specificity and satisfactory
reproducibility, and its practicality was verified in real cell lysates.
The whole process including instrumental and manual operation was
completed in no more than 3 h. This study provides a convenient and
rapid alternative method for the sensitive quantification of γH2AX,
which shows promising application in high-throughput screening of
genotoxic chemicals and drug candidates.