pH-Responsive Peptide Transfection via PKC Modulation
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Solution Overview
Problem
Current non-viral gene delivery methods face challenges in achieving high transfection efficiency, particularly with stem cells and post-mitotic cells, and existing methods often result in low cell viability and scalability issues.
Innovation Solution
The method involves modulating protein kinase C (PKC) activity and/or using a pH-responsive peptide with 5-20 histidine residues to enhance transfection efficiency, combined with histone deacetylase (HDAC) modulation, which significantly increases the efficiency of molecule delivery into cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electroporation is used to overcome poor transfection efficiency, then transfection efficiency is improved, but cell viability decreases and scalability becomes problematic
Solution Approach 1:
The patent replaces the mechanical electroporation method with a chemical approach using pH-responsive peptides containing histidine residues. These peptides undergo conformational changes in response to pH gradients within endosomes, enabling cargo release through chemical mechanisms rather than mechanical electrical pulses, thereby improving cell viability while maintaining transfection efficiency
Solution Approach 2:
The patent utilizes pH parameter changes within the cell (from extracellular neutral pH to intracellular acidic endosomal pH) to trigger the protonation of histidine residues in the delivery peptide. This parameter change drives the conformational transition and cargo release, enabling efficient transfection without the need for electroporation's mechanical energy input
2Object-affected harmful factors
If conventional non-viral delivery methods are used, then safety and cost are improved, but transfection efficiency in stem cells and post-mitotic cells remains low
Solution Approach 1:
The patent employs a composite delivery system consisting of a pH-responsive peptide containing 5-20 histidine residues combined with cargo molecules (nucleic acids, proteins, or nanoparticles). This composite structure leverages the pH-responsive properties of the histidine-rich peptide to achieve efficient cellular uptake and endosomal escape, dramatically improving transfection efficiency in difficult-to-transfect cells while maintaining the safety advantages of non-viral methods
Solution Approach 2:
The patent exploits the pH parameter change that occurs as endosomes mature and acidify. The histidine residues in the delivery peptide remain unprotonated at extracellular pH, allowing cell surface binding and uptake. Upon acidification within endosomes, the histidine residues become protonated, triggering conformational changes that lead to endosomal membrane disruption and cargo release into the cytoplasm, thereby achieving high transfection efficiency without viral vectors
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 achieves a 3-10 fold increase in transfection efficiency with HDAC modulation alone, a 10-20 fold increase with PKC modulation alone, and up to 50-200 fold increase when both are used together, effectively overcoming the limitations of existing non-viral gene delivery methods.
Implementation Method 1
The histidine residues of the pH responsive peptide may be capable of being protonated in an acidic environment of an endosome.
Data Source
AI summary
The invention relates to a method of transfecting a cell with a molecule, the method comprising the steps of: adding a molecule for transfection to the cells; and modulating the activity of protein kinase C (PKC) in the cell and/or providing a pH responsive peptide comprising between about 5 and about 20 histidine residues; and related compositions and uses in therapy.