Phospho-tau181 (p-tau181) antibody and antigen (Recombinant protein)

1. GeneMedi's three phosphorylated tau protein antibodies (p-tau181, p-tau217, and p-tau231) demonstrate outstanding sensitivity and exceptional specificity with their corresponding phosphorylated forms in direct ELISA assays.

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GeneMedi's p-tau antibodies and antigens demonstrate excellent binding affinity: GMP-h-p-tau181-Ab01 effectively binds with GMP-h-p-tau181-Ag01, GMP-h-p-tau217-Ab01 binds well with GMP-h-p-tau217-Ag01, and GMP-h-p-tau231-Ab01 shows strong binding with GMP-h-p-tau231-Ag01. These results indicate that GeneMedi's p-tau antibodies and antigens possess outstanding affinity.

Product used as below:

Fig 1. Validation of GeneMedi's Anti-human p-tau181/p-tau217/p-tau231 antibody in direct ELISA.

A. GeneMedi's GMP-h-p-tau181-Ab01 (Anti-human p-tau181 antibody) is validated to detect the GMP-h-p-tau181-Ag01 (p-tau181 antigen (peptide)) in ELISA, EC50 = 25.26 ng/ml.
B. GeneMedi's GMP-h-p-tau217-Ab01 (Anti-human p-tau217 antibody) is validated to detect the GMP-h-p-tau217-Ag01 (p-tau217 antigen (peptide)) in ELISA, EC50 = 25.85 ng/ml.
C. GeneMedi's GMP-h-p-tau231-Ab01 (Anti-human p-tau231 antibody) is validated to detect the GMP-h-p-tau231-Ag01 (p-tau231 antigen (peptide)) in ELISA, EC50 = 64.34 ng/ml.
The total tau antibody (GMP-h-TauAb01) does not interact with the p-tau181 (GMP-h-p-tau181-Ag01), p-tau217 (GMP-h-p-tau217-Ag01), and p-tau231 (GMP-h-p-tau231-Ag01) peptide antigen. (Data not shown)

2. In direct ELISA assays, GeneMedi's phosphorylated tau217 antibody demonstrates excellent sensitivity and precision for both full-length and peptide forms of the phosphorylated tau217 antigen. However, its ability to detect other phosphorylated antigens and total tau antigen is limited, indicating its highly specificity.

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GeneMedi's GMP-h-p-tau217-Ab01 antibody demonstrates excellent binding ability with the full-length antigen GMP-h-p-tau217-Ag02 as well as the peptide GMP-h-p-tau217-Ag01. However, when interacting with the antigens GMP-h-p-tau181-Ag01, GMP-h-p-tau231-Ag01, and GMP-h-Tau-Ag01, the affinity is relatively weaker, as reflected by significant differences in EC50 values. These results indicate that GeneMedi's p-tau 217 antibody exhibits high affinity and specificity. Product used as below:

Fig 2. Direct ELISA Binding Curves of Phosphorylated Tau217 Antibody with Various Antigens.

This graph displays the binding efficiency of the phosphorylated tau217 antibody with five different antigens in an ELISA setup. The x-axis represents the antibody concentration in a logarithmic scale (μg/ml), and the y-axis indicates the corrected absorbance, reflecting the binding efficiency between the antibody and antigens. The data illustrate that GMP-h-p-tau217-Ab01 exhibits high detection efficiency for GMP-h-p-tau217-Ag01 (peptide) with an EC50 of 4.326 ng/ml. For GMP-h-p-tau217-Ag02 (full length), the antibody demonstrates exceptionally high sensitivity, with an EC50 of only 6.943 ng/ml. Additionally, this antibody effectively detects GMP-h-p-tau181-Ag01 (peptide), GMP-h-p-tau231-Ag01 (peptide) and GMP-h-tau-Ag01 (full length) with EC50 values of 27320 ng/ml, 3563 ng/ml and 1843 ng/ml.

3. In sandwich ELISA assays, GeneMedi's p-tau217 antibody and tau antibody pair can detect the full-length phosphorylated 217 protein but are unable to detect phosphorylated 217 peptides or non-phosphorylated proteins.

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GMP-h-p-tau217-Ab01 is used as the capture antibody. When GMP-h-Tau-Ab03 is used as the detection antibody, the EC50 for detecting GMP-h-p-tau217-Ag02 is lower than GMP-h-Tau-Ab01, indicating GMP-h-Tau-Ab03 is more suitable as a detection antibody.
However, when detecting phosphorylated 217 peptide GMP-h-p-tau217-Ag01 or non-phosphorylated protein GMP-h-tau-Ag01, the EC50 remains high regardless of whether GMP-h-Tau-Ab03 or GMP-h-Tau-Ab01 is used, suggesting no binding for detecting peptide GMP-h-p-tau217-Ag01 or non-phosphorylated protein GMP-h-tau-Ag01 under these conditions.

Fig3. Sandwich ELISA Analysis of Full-Length Phosphorylated Tau 217 Antigen with Corresponding Phosphorylated Tau 217 Antibody and Total Tau Antibody.

A.This figure illustrates the detection efficacy of two different antibody combinations in Sandwich ELISA experiments targeting the GMP-h-p-tau217-Ag02 antigen (full length). The x-axis represents the antigen concentration displayed on a logarithmic scale (μg/ml), while the y-axis shows the corrected absorbance. The results indicate that the combination of GMP-h-p-tau217-Ab01 as the coating antibody and GMP-h-Tau-Ab01 as the detection antibody yields an EC50 of 76.55 ng/ml. Conversely, using GMP-h-p-tau217-Ab01 as the coating antibody and GMP-h-Tau-Ab03 as the detection antibody results in an EC50 of 39.02 ng/ml, demonstrating higher detection sensitivity at lower concentrations.
B.This figure demonstrates the detection results of two different detection antibodies (GMP-h-tau-Ab01 and GMP-h-tau-Ab03) against the GMP-h-tau-Ag01 antigen (full length) in an ELISA assay, using GMP-h-p-tau217-Ab01 as the coating antibody. The x-axis represents antigen concentration, displayed on a logarithmic scale (μg/ml); the y-axis shows corrected absorbance. The results reveal that when using GMP-h-tau-Ab03 as the detection antibody, the EC50 value reaches 20030 ng/ml, indicating a lower sensitivity to the antigen; whereas, when using GMP-h-tau-Ab01 as the detection antibody, the EC50 value soars to 4352000 ng/ml, demonstrating poor efficacy in detecting the antigen.
C. This figure illustrates the detection performance of four different antibody combinations in an ELISA assay targeting the GMP-h-p-tau217-Ag01 antigen (peptide). The x-axis represents antigen concentration, displayed on a logarithmic scale (μg/ml), while the y-axis shows the corrected absorbance. The curves in the figure show that all antibody combinations maintain relatively consistent absorbance changes across a range of low to high concentrations, indicating these results also reveal that the sensitivity of these four antibody combinations in detecting the GMP-h-p-tau217-Ag01 (peptide) antigen is relatively low.