Multi-Arm Degradable PEG Derivative for Cell-Safe Half-Life Extension
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Solution Overview
Problem
Existing high-molecular-weight multi-arm polyethylene glycol derivatives cause vacuolation in cells and do not effectively degrade in the body, leading to potential safety concerns and reduced half-life of bio-related substances.
Innovation Solution
A multi-arm degradable polyethylene glycol derivative with an oligopeptide structure that is stable in blood and degrades in cells, featuring specific oligopeptides with glycine as the C-terminal amino acid and neutral hydrophobic amino acids, allowing for industrial production and enhanced stability and degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If high-molecular-weight polyethylene glycol derivatives are used to prolong blood half-life, then the half-life is extended, but vacuole formation occurs in cells
Solution Approach 1:
The polyethylene glycol derivative is segmented into a multi-arm structure with multiple arms (typically 4-8 arms) each containing a polyethylene glycol chain. This segmentation allows the molecule to maintain high molecular weight for prolonged half-life while the distributed structure reduces cellular toxicity and vacuole formation compared to linear high-molecular-weight PEG.
Solution Approach 2:
The patent introduces specific functional groups at particular locations (termini or specific positions along the arms) to control the local properties of the molecule. These functional groups can be designed to be stable in blood but degradable in cells, creating different properties in different parts of the molecule to achieve both prolonged half-life and reduced cellular toxicity.
2Duration of action of moving object
If high-molecular-weight polyethylene glycol derivatives are used to increase molecular weight and avoid glomerular filtration, then blood half-life is prolonged, but the compounds do not effectively degrade in the body
Solution Approach 1:
The patent introduces dynamic degradability to the otherwise stable polyethylene glycol structure. The multi-arm PEG derivative is designed to be stable in blood circulation but can be degraded by specific enzymes (such as esterases or proteases) in cells or under specific conditions. This dynamic property allows the molecule to maintain its protective function in blood while enabling controlled degradation when needed.
Solution Approach 2:
The patent modifies specific parameters of the polyethylene glycol structure, such as introducing specific functional groups, controlling the arm number and length, and selecting specific monomer units that confer both stability in blood and degradability in cells. These parameter changes enable the molecule to achieve the desired balance between prolonged half-life and effective degradation.
3Quantity of substance
If polyethylene glycol derivatives are used to modify bio-related substances, then solubility and half-life are improved, but the complexity of the modified structure increases
Solution Approach 1:
The multi-arm polyethylene glycol derivative serves multiple functions simultaneously: it acts as a solubility enhancer, a half-life extender, and a protective agent against cellular toxicity. The universal structure can be applied to various bio-related substances (proteins, peptides, nucleic acids) through conjugation at different positions, providing multi-functional benefits without requiring separate modifications for each function.
Solution Approach 2:
The patent creates a composite structure combining polyethylene glycol chains with specific functional groups and/or bio-related substances. This composite multi-arm PEG derivative integrates the properties of different components (PEG for solubility and half-life, functional groups for specific interactions, and the conjugated bio-related substance for therapeutic activity) to achieve the desired overall performance.
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 derivative maintains blood stability and half-life comparable to conventional polyethylene glycol derivatives while preventing vacuole formation in cells and enabling multiple bio-related substances to be introduced into one molecule, enhancing pharmacological activity.
Implementation Method 1
a hydration layer formed by an ether bond of polyethylene glycol and a hydrogen bond with water molecule
Implementation Method 2
an oligopeptide which is stable in blood in the body and degraded by enzymes in cells
Data Source
AI summary
A multi-arm, degradable polyethylene glycol derivative with a high molecular weight that does not cause vacuolation of cells is provided. A degradable polyethylene glycol derivative represented by the following formula (1):wherein n1 and n2 are each independently 45-950, W1 and W2 are each independently an oligopeptide of 2-47 residues, a1 and a2 are each independently 1-8, Q is a hydrocarbon chain having 2-12 carbon atoms and optionally containing an oxygen atom and/or a nitrogen atom, X1 and X2 are each independently a functional group capable of reacting with a bio-related substance, and L1, L2, L3, L4, L5 and L6 are each independently a divalent spacer.