Annexin V Blocks Pathogen Phosphatidylserine to Restore Immune Detection
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Solution Overview
Problem
Intracellular pathogens evade host immune defenses by enveloping themselves in membranes with high levels of exofacial phosphatidylserine (PS), allowing them to enter immune cells and silence the immune response, leading to unchecked infection and disease.
Innovation Solution
Administering an effective dose of annexin V, a protein that binds to PS with high affinity, to block the binding sites on the pathogen surface, thereby masking PS and enhancing the host immune response to intracellular pathogens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intracellular pathogens envelop themselves with PS+ membranes, then they can enter immune cells and silence immune responses, but this leads to unchecked infection and disease spread
Solution Approach 1:
Annexin V acts as an intermediary molecule that binds to phosphatidylserine on pathogen surfaces, blocking the pathogen's ability to interact with immune cell receptors. This mediator prevents the harmful apoptotic mimicry mechanism while allowing the immune system to recognize and eliminate the pathogen.
Solution Approach 2:
The invention converts the harmful PS+ membrane envelope mechanism into a beneficial target for therapy. By using annexin V to specifically bind PS, the therapy exploits the pathogen's own apoptotic mimicry mechanism to enable its detection and elimination by the immune system, rather than allowing silent propagation.
2Reliability
If PS exposure is used by pathogens to suppress T-cell responses, then intracellular survival is enabled, but immune control is lost
Solution Approach 1:
Annexin V serves as a blocking intermediary that prevents direct interaction between pathogen PS and T-cell receptors. By occupying the PS binding sites on pathogens, annexin V eliminates the immunosuppressive signal while maintaining immune surveillance capability.
3Reliability
If efferocytosis is used by pathogens to enter target cells, then intracellular entry is facilitated, but immune detection is evaded
Solution Approach 1:
Annexin V acts as a blocking intermediary on the pathogen surface that prevents recognition by efferocytic receptors on immune cells. This blockade stops the pathogen from hijacking the efferocytosis pathway for silent entry into target cells.
Solution Approach 2:
The annexin V treatment applies preliminary anti-action by pre-blocking the PS receptors on pathogen surfaces before the pathogens can interact with immune cells. This prevents the apoptotic mimicry mechanism from initiating the harmful efferocytosis-based entry process.
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 use of annexin V effectively blocks the immunosuppressive effects of PS on intracellular pathogens, enhancing the host immune response and reducing the spread of pathogens, particularly in chronic infections such as those caused by Listeria monocytogenes and other intracellular bacteria and protozoa.
Implementation Method 1
Annexin V is an endogenous human protein which binds to exofacial PS with a high nanomolar affinity and may be used for this purpose
Data Source
AI summary
Methods are provided for treating a subject with for an intracellular pathogen infection, by administering an agent that masks or otherwise blocks phosphatidylserine on the pathogen cell surface.