Polyphenylalanine Derivative for Pluripotent Cell Removal

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Solution Overview

Problem

Current methods for removing pluripotent stem cells from cell specimens are inefficient and may contaminate transplantation materials with antibodies, raising safety concerns due to the presence of undifferentiated cells.

Innovation Solution

A polyphenylalanine derivative is used to selectively induce cell death in pluripotent stem cells, allowing for their removal from cell populations without contaminating the transplantation material.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If flow cytometry sorting using SSEA-4 antibody is used to remove pluripotent cells, then pluripotent cells can be selectively removed, but the transplantation material may be contaminated with antibodies

Engineering Contradiction:

Improveselectivity of pluripotent cell removalVSAvoidantibody contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent uses a small interfering RNA (siRNA) molecule as a temporary, non-permanent reagent to induce apoptosis in pluripotent cells. Unlike antibodies that may remain as contaminants, the siRNA acts transiently to trigger cell death pathways and is degraded naturally, eliminating contamination risks while maintaining selective removal capability

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent replaces the immunological mechanism (antibody binding and flow cytometry sorting) with a molecular biological mechanism (siRNA-mediated gene silencing and apoptosis induction). This substitution eliminates the need for physical sorting equipment and antibody reagents, achieving selective cell removal through biochemical pathways intrinsic to the target cells

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If conventional methods are used to remove pluripotent cells, then some removal efficiency is achieved, but the process is inefficient and time-consuming

Engineering Contradiction:

Improvepluripotent cell removal efficiencyVSAvoidcell processing time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent introduces siRNA that specifically targets and silences genes essential for pluripotent cell survival and self-renewal (such as OCT4, SOX2, or NANOG) before transplantation. This preliminary genetic intervention pre-programmes the pluripotent cells for apoptosis, enabling rapid and efficient removal without requiring extended processing times or multiple sorting steps

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the fundamental parameter of cell viability by introducing siRNA that alters gene expression profiles in pluripotent cells. This biochemical parameter change triggers apoptotic pathways, transforming the cell population from viable pluripotent cells to dying cells that can be easily removed, thereby dramatically improving removal efficiency and reducing processing time

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10689624B2Compound for identifying pluripotent cells

Publication Date: 2020.06.23 KYOTO UNIV

AI summary

[Problem to be Solved]To provide a compound for removing pluripotent cells from a cell population potentially containing the pluripotent cells.[Solution]A polyphenylalanine derivative is contacted with a cell population of interest.