Tendon Neotissue Bioreactor for Stem Cell Differentiation

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Solution Overview

Problem

Current methods for treating tendon and ligament injuries in equine athletes, such as tendinopathy and desmitis, face challenges including poor tissue healing capacity due to low cell numbers, limited blood supply, and inadequate migration of endogenous cells, leading to high reinjury rates and lack of a gold standard for effective healing.

Innovation Solution

A method involving the induction of tenogenic differentiation in adipose-derived stem cells (ASCs) using a bioreactor system with a porous biopolymer-based scaffold, applying tenogenic differentiation drivers like TGF-β1, and mechanical stimulations like flow shear stress and tensile strain to produce tenocyte-like cells and tendon neotissue, which can be used to treat tendon or ligament injuries.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If autologous tenocyte implantation is used to treat tendon injuries, then endogenous cells are delivered to the injury site, but the therapy is limited by few harvest sites, harvest morbidity, and is not practical in horses

Engineering Contradiction:

Improvehealing effectivenessVSAvoidpracticality of cell delivery

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent uses adipose-derived stem cells as an intermediary cell source instead of direct tenocyte implantation. These stem cells can be easily harvested from adipose tissue and then differentiated into tenocyte-like cells in vitro before implantation, thereby avoiding the limitations of direct autologous tenocyte harvest while still delivering functional tendon cells to the injury site

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent performs preliminary differentiation of stem cells into tenocyte-like cells in a bioreactor system before implantation. This preliminary action allows cells to be prepared in advance with desired tenogenic properties, making the actual surgical implantation more practical and effective

Inventive Principle:

Principle #10Preliminary action

2Quantity of substance

If exogenous adult multipotent stromal cells are administered to augment natural healing, then cell numbers at the injury site are increased, but engraftment is low and results are mixed

Engineering Contradiction:

Improvecell numbers at injury siteVSAvoidengraftment success

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent changes the differentiation state parameter of the cells by inducing tenogenic differentiation in stem cells before implantation. This parameter change transforms undifferentiated or poorly differentiated cells into committed tenocyte-like cells that are more likely to successfully engraft and function in the tendon tissue, thereby improving reliability while maintaining high cell numbers

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent enables cells to self-differentiate into the desired tenocyte phenotype through controlled culture conditions in a bioreactor system. This self-service approach allows cells to autonomously develop the necessary functional characteristics for tendon repair without requiring complex ex vivo manipulation or genetic modification

Inventive Principle:

Principle #25Self-service

3Manufacturing precision

If stem cells are differentiated into tenocyte-like cells using biochemical factors alone, then tenogenic differentiation is induced, but tissue organization and mechanical properties are insufficient

Engineering Contradiction:

Improvecell differentiation qualityVSAvoidtendon mechanical properties

Core Design Contradiction:

Manufacturing precisionVSStrength

Solution Approach 1:

The patent merges biochemical differentiation factors with mechanical stimuli in a bioreactor system. This combination approach simultaneously induces cellular differentiation and organizes the extracellular matrix with proper alignment and mechanical properties, achieving both high manufacturing precision and structural strength that neither method could achieve alone

Inventive Principle:

Principle #5Merging (Combining)

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 approach enhances tendon repair by producing tenocyte-like cells that form organized tendon neotissue, improving healing capacity and reducing reinjury rates by providing a reliable method for producing de novo tendon tissue.

Implementation Method 1

applying controlled mechanical stimulations to said cell-scaffold construct comprising: flow shear stress

Methodology Applied

Scientific EffectFlow shear stress: Shear Stress

Implementation Method 2

applying controlled mechanical stimulations to said cell-scaffold construct comprising: dynamic or static tensile strain

Methodology Applied

Scientific EffectTensile strain: Tension

Implementation Method 3

migration of endogenous tenocytes recruited by TGF-β signaling to the site of injury

Methodology Applied

Scientific EffectTGF-β signaling:

Data Source

PatentUS20240352424A1Methods of producing tendon neotissue from adult stem cells and uses thereof

Publication Date: 2024.10.24 BOARD OF SUPERVISORS OF LOUISIANA STATE UNIV & AGRI & MECHANICAL COLLEGE

AI summary

The invention relates to a method of producing a tendon neotissue from a population of adipose-derived stem cells (ASCs) subjected to mechanical and biological stimulations in a bioreactor system. The tendon neotissues are effective as implants to treat tendon or ligament injury in a subject. The invention also relates to a customized bioreactor useful for producing a tri-dimensional engineered tissue.