3D Gel-Like Substrate for Adherent Cell Expansion

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Solution Overview

Problem

Current methods for cultivating adherent cells, such as mesenchymal stromal cells, face challenges with contact inhibition, limited expansion capabilities, and the need for enzymatic treatments during passaging, which can damage cells and lead to undesired differentiation due to the use of plastic adherent monolayer cultures.

Innovation Solution

A method utilizing a three-dimensional gel-like substrate composed of blood platelet lysate that spontaneously gelatinizes at 37°C without coagulation-inducing agents, combined with a liquid medium containing a gelatinization-inhibiting substance like heparin, allowing for reliable cell expansion and minimization of contact inhibition without enzymatic treatment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If cells are cultured in plastic adherent monolayer, then cells can be easily maintained, but contact inhibition occurs and expansion is limited

Engineering Contradiction:

Improvecell expansion capabilityVSAvoidcontact inhibition

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent transitions from two-dimensional plastic adherent monolayer culture to three-dimensional gel-like substrate culture. This dimensional change allows cells to grow in multiple layers and directions, eliminating contact inhibition and enabling reliable cell expansion while maintaining cellular functions.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of operation

If enzymatic treatment is used for cell passaging, then cells can be detached from substrate, but cell damage and undesired differentiation occur

Engineering Contradiction:

Improvecell passaging capabilityVSAvoidcell damage

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent changes the physical-chemical parameters of the culture substrate by using a gel-like material with specific mechanical properties that allow non-enzymatic cell detachment. This parameter change enables cell passaging without enzymatic treatment, avoiding cell damage and maintaining cell integrity.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If fetal calf serum is used to supplement culture medium, then growth factors are provided, but xenogeneic immune reactions and pathogen transmission risks occur

Engineering Contradiction:

Improvecell growth supportVSAvoidxenogeneic immune reactions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces expensive and risky fetal calf serum with a disposable, human-derived gel-like substrate that provides necessary growth factors. This substitution eliminates xenogeneic immune reactions and pathogen transmission risks while maintaining cell growth support capabilities.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Object-affected harmful factors

If blood platelet lysate is used as culture medium supplement, then xenogeneic risks are avoided, but gelatinization occurs spontaneously at 37°C

Engineering Contradiction:

Improvexenogeneic pathogen riskVSAvoidmedium stability

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent introduces gelatinization-inhibiting substances as intermediaries that prevent spontaneous gelatinization of blood platelet lysate at 37°C. These inhibitors stabilize the medium composition, allowing the use of safe, human-derived platelet lysate without unwanted gel formation.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 enables efficient and reliable expansion of adherent cells, including mesenchymal stromal cells, with increased proliferation rates and cumulative population doublings, while avoiding xenogeneic immune reactions and bovine pathogen transmission, and allows for homogenous growth factor distribution, reducing the risk of undesired differentiation.

Implementation Method 1

Gelatinization of pure blood platelet lysate or a composition comprising blood platelet lysate, which is free of any gelatinization-inhibiting substance such as heparin, occurs spontaneously at approximately 37 °C within one hour.

Methodology Applied

Scientific EffectGelatinization: Gel

Implementation Method 2

cultivating the cells on the surface of and/or within a three-dimensional, gel-like substrate comprising 1-40 % (volume concentration) blood platelet lysate (BPL)

Methodology Applied

Scientific EffectThree-dimensional gel structure: Gel

Implementation Method 3

growth factors are evenly available in all directions

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentEP2723850B1Method for cultivating cells in platelet-lysate-containing medium

Publication Date: 2016.04.06 RWTH AACHEN UNIV

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AI summary

The invention concerns a method for cultivating adherent cells (1) using a liquid medium (3) comprising blood platelet lysate and a gelatinization-inhibiting substance, said method comprising cultivating the cells (1) on the surface of and/or within a three-dimensional, gel-like substrate (4) comprising 1-60 % blood platelet lysate but being substantially devoid of a gelatinization-inhibiting substance, wherein the liquid medium (3) is layered on the gel-like substrate (4). The invention further relates to a two-phase system and a gel for cultivating cells.