Diblock Copolymer-Assisted Viral Transduction of Eukaryotic Cells
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Solution Overview
Problem
Existing methods for genetically modifying eukaryotic cells, such as hematopoietic stem cells and hematopoietic progenitor cells, are inadequate for effectively expressing a transgene and promoting cell proliferation and survival, particularly in treating genetic diseases associated with protein deficiencies.
Innovation Solution
The use of a diblock copolymer comprising polyoxyethylene (PEO) and polyoxypropylene (PPO) subunits in conjunction with a viral vector and a substance that reduces protein kinase C (PKC) activity to enhance viral transduction and promote transgene expression, nuclear migration, and cell survival.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional viral vectors are used to genetically modify eukaryotic cells, then transgene expression is achieved, but transduction efficiency is insufficient and cell proliferation/survival is compromised
Solution Approach 1:
The diblock copolymer acts as an intermediary substance that facilitates viral transduction into eukaryotic cells. The copolymer contains a viral transduction-enhancing component that specifically improves the efficiency of viral vector delivery without directly interacting with the viral vector or cell in a way that would compromise cell health. This mediator approach resolves the contradiction by enabling higher transduction efficiency while maintaining cell proliferation capacity.
Solution Approach 2:
The invention changes the chemical parameters of the transduction environment by introducing a diblock copolymer with specific hydrophilic and hydrophobic segments. The copolymer's unique structural parameters (block lengths, composition ratios) are optimized to enhance viral transduction while maintaining biocompatibility. This parameter modification allows simultaneous improvement of transduction efficiency and cell survival outcomes.
2Manufacturing precision
If viral transduction is enhanced to improve transgene expression, then genetic modification efficiency increases, but cell toxicity and reduced cell survival occur
Solution Approach 1:
The diblock copolymer serves as a protective intermediary that enhances viral transduction while reducing direct toxic effects on cells. The copolymer's amphiphilic structure allows it to interact with both the viral vector and cell membrane, facilitating efficient transduction while the hydrophilic blocks provide steric protection that reduces cellular toxicity. This mediator function resolves the contradiction between high genetic modification efficiency and low cell toxicity.
Solution Approach 2:
The invention uses a composite diblock copolymer structure combining hydrophilic and hydrophobic segments with complementary functions. The hydrophobic blocks enhance viral membrane interaction and transduction efficiency, while the hydrophilic blocks reduce cellular toxicity and improve biocompatibility. This composite material approach allows simultaneous achievement of high genetic modification efficiency and low cell toxicity.
Data Source
AI summary
Described herein are compositions and methods for modifying eukaryotic cells, for example, to express a transgene of interest and/or to produce an expanded population of cells ex vivo. Using the compositions and methods of the disclosure, a population of eukaryotic cells, such as a population of pluripotent cells (e.g., CD34+ hematopoietic stem or progenitor cells) may be transduced to express a gene of interest by contacting the cells with a viral vector, such as a lentiviral vector, and a diblock copolymer, such as a diblock copolymer composed of a hydrophilic region and a hydrophobic region. For example, the diblock copolymer may be composed of polyoxyethylene (PEO) subunits and polyoxypropylene (PRO) subunits. Additionally, the compositions and methods described herein can be used to promote the proliferation or survival of a population of pluripotent cells (e.g., CD34+ hematopoietic stem or progenitor cells) ex vivo, for example, by contacting the cells with a diblock copolymer.