Oxidative Stress Nerve Cell Model for Sporadic Neurodegeneration
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Solution Overview
Problem
Existing methods fail to accurately reproduce the pathological condition of sporadic neurodegenerative diseases in vitro, as they rely on short-time oxidative stress or disease-related gene mutations, which do not reflect the gradual nerve cell loss seen in these diseases.
Innovation Solution
A method for producing nerve cells by seeding human-derived pluripotent stem cells at a low density in a culture medium devoid of antioxidants and oxidants, applying chronic weak oxidative stress to induce nerve cell damage, allowing for the production of nerve cells with markers of oxidative stress, neurite retraction, necroptosis, and ferroptosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If short-time oxidative stress stimulus is applied using hydrogen peroxide, then nerve damage is induced quickly, but the pathological condition of neurodegenerative disease cannot be accurately reproduced
Solution Approach 1:
The patent changes the parameters of oxidative stress application from high concentration/short time to low concentration/long time. Specifically, it uses weak oxidative stress (lower concentration of oxidizing agents) applied chronically over extended periods, which transforms the nature of cell death from acute to gradual, accurately reproducing the progressive neuronal loss seen in neurodegenerative diseases.
Solution Approach 2:
The patent implements periodic or continuous application of weak oxidative stress over multiple days or weeks rather than a single acute exposure. This chronic stimulation pattern allows progressive accumulation of oxidative damage, mimicking the gradual pathological process of neurodegenerative diseases.
2Reliability
If disease-related gene mutations are used to induce nerve damage, then the model reflects genetic neurodegenerative diseases, but it cannot reproduce sporadic neurodegenerative diseases
Solution Approach 1:
The patent extracts the essential pathological mechanism (oxidative stress) from the specific genetic context. By applying oxidative stress directly to cells without requiring disease-related gene mutations, the method separates the core pathological process from genetic predisposition, enabling modeling of sporadic cases that lack specific mutations but still exhibit oxidative stress-mediated neuronal damage.
Solution Approach 2:
The oxidative stress induction method serves multiple functions: it can model both genetic and sporadic neurodegenerative diseases, works across different cell types and disease models, and reproduces the universal pathological feature of oxidative damage without requiring disease-specific genetic modifications.
3Reliability
If antioxidants are added to the culture medium, then nerve cell survival is improved, but oxidative stress-induced nerve damage cannot be reproduced
Solution Approach 1:
The patent applies oxidative stress at levels that are partial or sub-lethal initially, allowing cells to experience chronic low-level stress rather than immediate overwhelming damage. This partial action enables the induction of progressive damage over time while maintaining cell viability long enough to observe the pathological process, whereas complete protection with antioxidants would prevent any damage induction.
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 method enables the production of nerve cells that accurately model sporadic neurodegenerative diseases, facilitating drug screening and inhibitor identification for neurodegenerative diseases such as Alzheimer's and ALS.
Implementation Method 1
applying chronic weak oxidative stress to induce nerve cell damage
Data Source
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AI summary
An object of the present invention is to provide a method for producing nerve cells damaged by oxidative stress from a human-derived pluripotent stem cell; a culturing method for cells that allows nerve cells damaged by oxidative stress to be produced from a human-derived pluripotent stem cell; nerve cells damaged by oxidative stress; an evaluation method for a test substance, a screening method for a drug for prevention and/or treatment of a neurodegenerative disease, a screening method for a necroptosis inhibitor, and a screening method for a ferroptosis inhibitor, which use the nerve cells. According to the present invention, there is provided a production method of nerve cells damaged by oxidative stress, the method including a step a of seeding nerve cells obtained by differentiation from a human-derived pluripotent stem cell, at a cell density of 20.0 × 104 cells/cm2 or less by using a culture medium that substantially does not contain an antioxidant and substantially does not contain an oxidant and a step b of culturing the nerve cells by using the culture medium that substantially does not contain an antioxidant and substantially does not contain an oxidant.