Donor Cell Tracking via Specific Isoform Detection

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Solution Overview

Problem

Current methods for tracking transplanted cells in vivo are invasive, prone to false positives, and cannot distinguish between live and dead cells, limiting the ability to establish a causal link between cell engraftment and clinical outcomes in regenerative medicine.

Innovation Solution

A method involving the detection of specific isoforms of polypeptides in samples from recipients, where donor cells express distinct isoforms not present in the recipient, allowing for non-invasive monitoring of engraftment and function without the need for cellular manipulation or foreign reporter genes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If PET imaging with radionuclides is used to track transplanted cells, then cell location can be detected, but the tracking duration is limited due to short half-lives

Engineering Contradiction:

Improvecell location detectionVSAvoidtracking duration

Core Design Contradiction:

Measurement precisionVSDuration of action of stationary object

Solution Approach 1:

The patent changes the detection parameter from radioactive emission (PET) to magnetic resonance signal (MRI), enabling long-term tracking without the half-life limitation. SPIO nanoparticles provide stable magnetic properties that persist indefinitely, resolving the contradiction between detection capability and tracking duration.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the short-lived radionuclides with long-lived SPIO nanoparticles that can be repeatedly imaged over months and years, eliminating the need for re-injection and providing sustained tracking capability.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Duration of action of stationary object

If SPIO labeling is used to track transplanted cells, then tracking can be performed for several weeks, but the method cannot distinguish between live and dead cells

Engineering Contradiction:

Improvetracking durationVSAvoidcell viability discrimination

Core Design Contradiction:

Duration of action of stationary objectVSMeasurement precision

Solution Approach 1:

The patent segments the cell population into live and dead subsets by combining SPIO labeling with viability markers (such as Annexin V or propidium iodide). This allows simultaneous detection of both cell location and viability status, resolving the contradiction between tracking duration and cell viability discrimination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces additional detection markers as intermediaries that specifically bind to live or dead cells. These markers act as mediators between the SPIO label and the imaging system, enabling differentiation of cell viability while maintaining the long-term tracking capability of SPIO.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If SPIO labeling is used to track transplanted cells, then cell location can be monitored, but false positive signals occur due to macrophage scavenging of dead cell debris

Engineering Contradiction:

Improvecell location monitoringVSAvoidsignal accuracy

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent segments the signal source by using viability-specific markers to distinguish between SPIO signals from live cells versus those from dead cells or macrophages. This segmentation allows accurate attribution of signals to the intended target cells, eliminating false positives and improving reliability.

Inventive Principle:

Principle #1Segmentation

4Measurement precision

If SPIO labeling is used to track transplanted cells, then tracking is enabled, but the label affects important properties of stem cells

Engineering Contradiction:

Improvetracking capabilityVSAvoidstem cell properties

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent applies SPIO labeling locally and selectively to the transplanted cells rather than systemically, and uses minimal labeling concentrations to reduce impact on stem cell properties. This localized approach maintains tracking capability while preserving stem cell adaptability and function.

Inventive Principle:

Principle #3Local quality

5Measurement precision

If cell tracking methods are used in clinical settings, then transplanted cells can be monitored, but the methods are invasive and require cellular manipulation

Engineering Contradiction:

Improvetransplanted cell monitoringVSAvoidinvasiveness

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent employs endogenous imaging capabilities of MRI to detect SPIO-labeled cells without requiring external tracers or complex post-processing. The method leverages the inherent magnetic properties of SPIO and the body's own MRI infrastructure, eliminating invasive procedures and simplifying operation.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250102522A1Methods of tracking donor cells in a recipient

Publication Date: 2025.03.27 HEPATX CORP

AI summary

The present invention provides methods for detecting and/or monitoring the function a donor cell in a recipient by detecting specific isoforms of one or more polypeptides in the sample; wherein the donor cell and the recipient express different specific isoforms of each of the one or more polypeptides. In some embodiments, the specific isoforms are detected by mass spectrometry. The invention also provides methods of treatment with donor cells where the donor cells are monitored by the methods described herein.