This ELISA kit provides quantitative measurement of human ERBB2 (HER2) in biological samples, supporting research into receptor tyrosine kinase signaling and oncogenic pathway activation. Because ERBB2 is shed from the cell surface as an extracellular domain (ECD) fragment whose circulating levels shift markedly between normal and malignant states, accurate quantification across diverse sample contexts demands both broad dynamic range and low-level sensitivity.
Detection Range: The 7.8–500 pg/mL range captures the low baseline concentrations of shed ERBB2 ECD found in healthy serum while accommodating elevated levels in conditioned media from ERBB2-overexpressing cell lines. Samples from patients with advanced HER2-positive malignancies or concentrated culture supernates may require dilution to fall within this window.
Sensitivity: At 3.9 pg/mL, the kit detects ERBB2 shedding from cells with low receptor copy numbers or under pharmacological inhibition of metalloprotease-mediated cleavage, enabling dose-response studies with agents targeting ADAM10/TACE activity.
Sample Compatibility: Validation across serum, plasma, cell culture supernates, cell lysates, and tissue homogenates allows researchers to correlate membrane-bound ERBB2 in tumor lysates with shed ECD in matched circulation samples—critical for translational biomarker studies.
Assay Efficiency: The 1–5 hour protocol using only 50–100 µL accommodates limited clinical specimens such as serial blood draws and small biopsy homogenates common in longitudinal monitoring.
This kit is directly applicable to HER2-positive breast and gastric cancer biomarker research, anti-HER2 therapeutic response monitoring, and ERBB2 dimerization signaling studies.