Photochemical Internalization for CD8 T-Cell Activation
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Solution Overview
Problem
Current vaccination methods primarily activate CD4 T-helper cells and B cells, but struggle to induce cytotoxic CD8 T-cell responses due to difficulties in delivering antigens to the cytosol and the MHC class-I pathway, limiting their effectiveness in combating intracellular infections and cancer.
Innovation Solution
The use of a photosensitizing agent, an antigenic molecule, and the cytokine GM-CSF, combined with light irradiation, to enhance photochemical internalization (PCI) for improved antigen delivery into the cytosol, facilitating increased antigen presentation on MHC Class I molecules and enhanced CD8+ T-cell responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vaccination methods are used, then CD4 T-helper cells and B cells are activated, but cytotoxic CD8 T-cell responses fail to be induced due to difficulty in delivering antigen to the cytosol and MHC class-I pathway
Solution Approach 1:
The patent employs photosensitizing agents as intermediaries that, when activated by light, facilitate the transfer of antigen from endosomal compartments to the cytosol. This intermediary mechanism overcomes the natural barrier preventing antigen access to the MHC class-I pathway, enabling CD8 T-cell activation without requiring direct cytosolic delivery methods
Solution Approach 2:
The invention replaces mechanical or chemical methods of forcing antigen into the cytosol with a photochemical system. Light-activated photosensitizers create reactive oxygen species that disrupt endosomal membranes, allowing antigen release into the cytosol through a chemical mechanism rather than mechanical disruption or invasive delivery systems
2Reliability
If photochemical internalization (PCI) is used to deliver antigen to the cytosol, then CD8 T-cell responses are enhanced, but the complexity of the vaccination method increases due to the need for photosensitizing agents and light irradiation
Solution Approach 1:
The patent combines multiple functions into a single vaccination step: antigen delivery, endosomal escape, and cytosolic release are all achieved simultaneously through light activation of the photosensitizer. This merging of functions reduces the need for separate delivery systems or multiple administration steps, simplifying the overall process despite the photochemical component
Solution Approach 2:
The invention utilizes changes in the physical state and reactivity of photosensitizing agents upon light exposure to trigger antigen release. By controlling light wavelength, intensity, and timing, the system achieves precise control over the vaccination process, allowing optimization of CD8 T-cell activation while managing the complexity of the photochemical 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 leads to increased production of antigen-specific T cells and improved immune responses, specifically activating CD8+ T cells, thereby enhancing vaccination efficacy.
Implementation Method 1
Photochemical internalisation (PCI) improves delivery of molecules into the cytosol... PCI is a technique which uses a photosensitising agent, in combination with an irradiation step to activate that agent, and is known to achieve release of molecules co-administered to a cell into the cell's cytosol
Data Source
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AI summary
The present invention provides a method of expressing an antigenic molecule or a part thereof on the surface of a cell using a photochemical internalisation method in which a cytokine, preferably GM-CSF, is used to enhance the method. The method may be used to stimulate an immune response and for various therapeutic or prophylactic methods. Pharmaceutical compositions or kits comprising the components for use in the method, cells produced by the method and their use in therapy and prophylaxis also form aspects of the invention.