ETEC CS6 Surface Antigen Enhancement by Phenol Inactivation
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Solution Overview
Problem
Existing methods fail to effectively increase the presentation of ETEC CS6 antigen on bacterial surfaces while preserving its immunological activity, limiting the efficacy of oral vaccines due to adverse effects from high bacterial loads.
Innovation Solution
A method involving phenol treatment of E. coli cells expressing CS6 antigen, which increases antigen presentation by at least 100% and concomitantly inactivates the bacteria, using specific concentrations and conditions to maintain antigen integrity and reduce bacterial numbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high numbers of bacteria are given orally to increase antigen delivery, then the amount of antigen delivered is improved, but adverse effects such as vomiting occur
Solution Approach 1:
The patent changes the parameter of antigen concentration on bacterial surfaces by treating bacteria with phenol and other agents, thereby increasing the amount of antigen presented per cell without increasing the total number of bacteria administered
Solution Approach 2:
The patent creates recombinant bacteria that express high levels of colonization factor antigens as copies on their surfaces, effectively multiplying the antigenic signal per cell without increasing bacterial load
2Quantity of substance
If phenol treatment is applied to increase antigen presentation, then antigen presentation is improved, but bacterial viability is reduced
Solution Approach 1:
The patent converts the harmful effect of phenol (which kills bacteria) into a beneficial effect by using controlled phenol treatment to increase antigen presentation while accepting that the bacteria will be inactivated, thereby creating a safe but highly immunogenic vaccine
Solution Approach 2:
The patent optimizes the concentration and exposure time of phenol treatment to achieve the desired balance between antigen presentation enhancement and bacterial inactivation, treating these as controllable parameters
3Stability of the object's composition
If formalin treatment is used to preserve bacteria for vaccine, then bacterial stability is improved, but CS6 antigen properties are destroyed
Solution Approach 1:
The patent identifies and applies alternative treatment parameters (phenol instead of formalin, specific concentrations and exposure times) that achieve bacterial stabilization without destroying the CS6 antigen, demonstrating that different parameter combinations yield different outcomes
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
The method enhances antigen presentation on bacterial surfaces, inducing strong immune responses in mice, reducing the number of cells needed for vaccination and minimizing adverse effects.
Implementation Method 1
contacting cells expressing said antigen with an aqueous solution comprising 0.6-2.2 percent phenol by weight, such that the presentation of said antigen is increased by at least 100%
Data Source
AI summary
A method for increase the presentation of ETEC CS6 antigen on a cell surface, comprising the step of contacting cells expressing said antigen with an aqueous solution comprising 0.6-2.2 percent phenol by weight, such that the presentation of said antigen is increased by at least 100%. A method for the manufacture of a killed whole cell vaccine for immunization against CS6-expressing ETEC. Cells and vaccines obtainable by the above methods.