Baculovirus Binding Assay for Antibody Clearance Prediction

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Solution Overview

Problem

Current methods for predicting the pharmacokinetic profile of therapeutic antibodies in cynomolgus monkeys are inefficient and costly, as they rely on expensive and time-consuming in vivo studies, and there is a lack of effective tools to identify off-target binding contributions to fast clearance rates.

Innovation Solution

A method involving an ELISA assay using baculovirus particles to assess the binding of therapeutic antibodies, which calculates a BV score to predict desirable clearance rates, helping to select antibodies with reduced risk of fast clearance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If in vivo studies are used to predict pharmacokinetic profile, then prediction accuracy is improved, but cost and time consumption increase

Engineering Contradiction:
Improveprediction accuracyVSAvoidtime consumption
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing in silico predictions and in vitro binding assays before conducting in vivo studies. The method uses computational models to predict off-target binding and identifies high-risk antibodies early in the selection process, allowing researchers to prioritize which candidates warrant expensive in vivo testing. This preliminary screening reduces the number of animals needed and accelerates the overall drug discovery timeline.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent employs copying by creating in silico models that replicate in vivo pharmacokinetic behavior. The computational models simulate antibody clearance mechanisms and predict human pharmacokinetics based on non-clinical data, providing a virtual copy of the complex in vivo system. This allows multiple scenarios to be tested computationally before committing to actual animal studies.

Inventive Principle:
Principle #26Copying

2Reliability

If in vivo studies are used to predict clearance rate, then prediction reliability is improved, but cost increases

Engineering Contradiction:
Improveprediction reliabilityVSAvoidcost
Core Design Contradiction:
ReliabilityVSLoss of energy

Solution Approach 1:

The patent performs preliminary in silico predictions and in vitro binding assessments before expensive in vivo studies. By identifying antibodies with high predicted risk of fast clearance through computational models and off-target binding assays, the method filters out poor candidates early, ensuring that costly in vivo resources are allocated only to promising candidates with lower predicted risk.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent introduces in silico predictions and in vitro binding assays as intermediary steps between antibody selection and in vivo testing. These intermediate assessments provide early indicators of pharmacokinetic risk, serving as mediators that guide the selection process and reduce the number of antibodies requiring expensive in vivo validation.

Inventive Principle:
Principle #24Intermediary (Mediator)

3Measurement precision

If traditional selection methods are used, then identification of fast clearance risk is improved, but efficiency decreases

Engineering Contradiction:
Improveidentification accuracyVSAvoidefficiency
Core Design Contradiction:
Measurement precisionVSProductivity

Solution Approach 1:

The patent uses in silico models as virtual copies to predict pharmacokinetic behavior and identify fast clearance risk. The computational models replicate the complex interactions between antibodies and the human pharmacokinetic system, allowing rapid assessment of multiple candidates without wet lab experiments. This digital copying approach maintains prediction accuracy while dramatically improving throughput and efficiency.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The patent replaces traditional mechanical/wet lab-based selection methods with in silico computational predictions. Instead of relying solely on time-consuming in vitro binding assays and in vivo studies, the method uses computer-based models to predict off-target binding and clearance risk, substituting computational mechanics for traditional experimental mechanics and significantly accelerating the selection process.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for the identification of antibodies with a lower risk of fast clearance, reducing the need for costly in vivo studies and aiding in the selection of therapeutic candidates with improved pharmacokinetic properties.

Implementation Method 1

contacting the therapeutic agent with a baculovirus particle (BV) bound to a microtiter plate, measuring the level of binding of the therapeutic agent to the BV

Methodology Applied
Scientific EffectBinding: Adsorption

Data Source

PatentEP2852840B1Selection method for therapeutic agents
Publication Date: 2019.10.09 F HOFFMANN LA ROCHE & CO AG
  • EP2852840B1 patent drawingFigure 1~2
  • EP2852840B1 patent drawingFigure 3~4
  • EP2852840B1 patent drawingFigure 5A~5B

AI summary

The invention relates to methods for detecting off-target binding of therapeutic candidates comprising the step of measuring the level of binding of a therapeutic agent with a baculovirus (BV) particle. This assay can be used, inter alia, during antibody lead generation or optimization to increase the probability of obtaining a suitable drug.