Quantitative imaging microscopy
Overview
Quantitative imaging microscopy (also referred to as quantitative immunofluorescence microscopy or QuantIM in some implementations) combines automated fluorescence microscopy with computational image analysis to yield quantitative, single-cell-level readouts of protein expression, DNA damage markers, and cell viability. Common applications include automated nuclear counting (for cell number / viability assays), quantification of gamma-H2AX foci (DNA double-strand break marker), and measurement of activated caspase-3 signal intensity (apoptosis marker). This approach enables high-throughput, objective quantification of pharmacodynamic endpoints in cell-based assays.
Used by
- Used to quantify gamma-H2AX foci (DNA double-strand breaks) and cleaved caspase-3 (apoptosis) in FBXO7-knockout vs. control colonic epithelial cells treated with the CHEK1 inhibitor Prexasertib; >550 cells per condition analyzed; FBXO7-deficient cells showed a 41.6-fold increase in mean gamma-H2AX foci and a 2.6-fold increase in cleaved caspase-3 signal intensity versus controls PMID:36334560
Notes
- Automated nuclear counting eliminates observer bias in cell viability/proliferation assays.
- Gamma-H2AX foci quantification is a widely accepted pharmacodynamic marker for DNA double-strand breaks induced by genotoxic agents.
- Cleaved caspase-3 immunofluorescence provides an early apoptosis readout distinct from endpoint viability assays.
- Throughput and sensitivity depend on the imaging platform and antibody quality; single-replicate experiments (as in PMID:36334560) may limit statistical reproducibility.
Sources
- PMID:36334560 — FBXO7/CHEK1 synthetic lethality study in colorectal cancer; quantitative immunofluorescence microscopy for gamma-H2AX foci and cleaved caspase-3 in Prexasertib-treated FBXO7-knockout cells.
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