Polypeptide Nanoparticle Vaccine Shell Design
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Solution Overview
Problem
Current drug delivery systems using protein nanoparticles aim to minimize immune response, but polypeptide particles with a water-immiscible core and shell generate a significant immune response, which can be advantageous for vaccination but needs to be harnessed effectively.
Innovation Solution
Development of vaccine compositions comprising polypeptide particles with a water-immiscible core and a cross-linked polypeptide shell, incorporating pathogenic antigen proteins or adjuvant polypeptides, to enhance immunogenicity and improve vaccine efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protein nanoparticles are used as drug delivery systems, then drug delivery to the desired site is achieved, but immune response to the protein delivery vehicle causes adverse reactions
Solution Approach 1:
Instead of using non-immunomodulatory proteins to minimize immune response (conventional approach), the patent inverts the strategy by using immunomodulatory proteins in the shell to actively generate immune response for vaccination purposes. The water-immiscible core maintains the particle's ability to deliver payload while the immunomodulatory protein shell harnesses the immune system for protective effect.
Solution Approach 2:
The patent changes the immunogenicity parameter of the protein shell by selecting specific immunomodulatory proteins (such as albumin from non-human sources, or proteins with specific amino acid sequences) that are known to elicit strong immune responses. This parameter change transforms the particle from a passive delivery vehicle to an active immunogen.
2Reliability
If polypeptide particles with water-immiscible core and shell are used to generate immune response, then vaccine efficacy is improved, but the complexity of particle production increases
Solution Approach 1:
The patent employs a nested structure where the water-immiscible core (containing drug payload or adjuvant) is nested within the polypeptide shell. This core-shell architecture allows the immunomodulatory protein shell to be formed around a pre-formed water-immiscible core, simplifying the overall production process compared to assembling separate components.
Solution Approach 2:
The patent creates a composite particle system combining water-immiscible material (core) with polypeptide material (shell). This composite structure leverages the properties of both materials: the water-immiscible core provides stability and payload containment, while the polypeptide shell provides immunogenicity. The composite nature allows for modular production where each component can be optimized independently.
3Reliability
If cross-linked polypeptide particles are used to enhance immune response, then immunogenicity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the chemical state of the polypeptide from linear to cross-linked network structure. This parameter change (forming a gel-like cross-linked shell) enhances the immunogenicity by creating a more stable and persistent particle structure that better presents antigens to the immune system. The cross-linking can be achieved through controlled chemical reactions that are robust enough for manufacturing.
Solution Approach 2:
The cross-linking is applied locally to form the shell structure rather than throughout the entire particle. The water-immiscible core remains uncross-linked to maintain its properties, while only the polypeptide shell undergoes cross-linking to provide structural integrity and immunogenicity. This localized application of cross-linking reduces manufacturing complexity compared to cross-linking the entire particle.
Data Source
AI summary
The invention describes vaccine compositions containing particles having a polypeptide shell and a water-immiscible core. The polypeptide shell may comprise one or more pathogenic antigen proteins and/or one or more adjuvant polypeptides. Administration of the composition generates an immune response to the polypeptide contained in the shell. Adjuvant may be comprised in the water-immiscible core of the particle. The particles are therefore useful in methods of vaccination.