Protocol: PK Bridging ELISA Detecting Total Drug Using Anti-Etanercept Antibodies
Pharmacokinetic (PK) Bridging ELISA Protocol Detects Total Drug (Free, Partially, and Fully Bound): For Use with Anti-Etanercept Monoclonal Antibodies Catalog HCA276 with TZA0145P
This method provides a procedure for carrying out a PK ELISA with Anti-Etanercept Antibodies, HCA276 (capture antibody) and HRP-conjugated TZA0145P (detection antibody), using etanercept for the standard curve. The method should always be used in conjunction with product and batch-specific information provided with each vial (see product datasheets). This protocol will need to be adjusted for use with different detection methods and immunoassay technology platforms.
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Reagents
- BSA (Sigma-Aldrich, A7906)
HISPEC Assay Diluent (BUF049)
Human Serum (Sigma-Aldrich, H4522) - Phosphate buffer saline
- 136 mM NaCl
2.68 mM KCl
8.1 mM Na2HPO4
1.46 mM KH2PO4 - PBST
- PBS with 0.05% Tween 20 (Merck Millipore, 817072)
- QuantaBlu Fluorogenic Peroxidase Substrate (Thermo Fisher Scientific, 15169)
Materials
- 384-well microtiter plate, black, square flat-bottom wells, for example, Black 384-Well Immuno Plates (Thermo Fisher Scientific, 10395991)
- Fluorescence plate reader
- 96-well plates can be used instead of 384-well plates (black, flat-bottom wells), for example, Black 96-Well Immuno Plates (Thermo Fisher Scientific, 437111). For the 96-well format, use 100 μL (instead of 20 μL) of antigen, antibodies, or substrate and 300 μL for the blocking step.
Method
- Prepare the capture Anti-Etanercept Antibody HCA276 (AbD25939) at 1 µg/mL in PBS. Coat the required number of wells of a 384-well microtiter plate with 20 µL per well of the prepared capture antibody, and incubate overnight at 4°C.
- Wash the microtiter plate five times (5x) with PBST.
- Block the microtiter plate by adding 100 µL 5% BSA in PBST to each well, and then incubate for 1 hr at RT.
- Wash the microtiter plate 5x with PBST.
- For the standard curve, prepare a dilution series of etanercept in 10% human serum in PBST in triplicate. Final concentration of etanercept should cover the range from 0.008 ng/mL to 32,000 ng/mL. Include a zero etanercept concentration as the background value.
- Add 20 µL of etanercept dilution per well (in triplicate for each standard recommended). Add 20 µL of each test sample to the other wells (in triplicate for each sample recommended). Incubate for 1 hr at RT.
- Wash the microtiter plate 5x with PBST.
- To each well, add 20 µL HRP-conjugated detection Anti-Etanercept Antibody, TZA0145P (AbD26183pap), at 0.5 µg/mL in HISPEC Assay Diluent. Incubate for 1 hr at RT.
- Wash the microtiter plate 10x with PBST.
- Add 20 µL QuantaBlu Fluorogenic Peroxidase Substrate to each well and measure the fluorescence after 30 min.
