Non-biodegradable Polymeric Coatings for Stable Cell Attachment

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Solution Overview

Problem

Existing cell culture coatings are prone to degradation, leading to compromised cell adhesion and viability due to the loss of polymeric materials into the culture medium or body fluids, and they do not provide a stable surface for long-term cell attachment and differentiation.

Innovation Solution

Development of non-biodegradable polymeric coatings with pendent amine groups and latent reactive groups that covalently bind to the surface, preventing degradation and maintaining cell attachment for extended periods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If biodegradable polymeric coatings are used to promote cell attachment, then cell adhesion is enhanced initially, but the coating degrades over time leading to compromised cell attachment and viability

Engineering Contradiction:

Improvecell attachment stabilityVSAvoidcoating durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the chemical composition parameter by incorporating non-biodegradable polymeric materials (such as polyethyleneimine, polylysine, or polyornithine) combined with biodegradable polymers in specific ratios. This parameter change allows the coating to maintain structural integrity and cell attachment properties over extended periods while still providing necessary biological activity for cell proliferation and differentiation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite coating system combining non-biodegradable polymeric materials with biodegradable polymers. The non-biodegradable component provides long-term structural stability and resistance to proteolytic degradation, while the biodegradable component provides initial cell attachment cues. This composite approach resolves the contradiction by integrating materials with complementary properties.

Inventive Principle:

Principle #40Composite materials

2Reliability

If polymeric materials are used to coat surfaces for cell attachment, then cell adhesion is promoted, but the materials may be lost from the coating affecting cell viability and interactions

Engineering Contradiction:

Improvecell adhesion promotionVSAvoidpolymer material loss

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent uses an intermediary crosslinking mechanism involving glutaraldehyde or other crosslinking agents that form covalent bonds between the polymeric coating materials and the substrate surface. This intermediary crosslinking step prevents polymer material loss into the culture medium while maintaining the biological activity necessary for cell attachment and viability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces physical adsorption or weak bonding mechanisms with chemical crosslinking mechanisms. By using crosslinking agents to form covalent bonds, the coating materials are firmly anchored to the substrate, eliminating the problem of material loss that occurs with weaker bonding mechanisms.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If charged surfaces are used to promote cell attachment, then some cell types show improved adhesion, but not all charged surfaces provide sufficient attachment for long-term culturing

Engineering Contradiction:

Improvecell attachment promotionVSAvoidcell type compatibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by incorporating specific cell-adhesive proteins (such as fibronectin, collagen, or laminin) at defined locations within the polymeric coating structure. This allows different regions of the coating to provide specific attachment cues tailored to different cell types, enhancing both the reliability of attachment and the adaptability to various cell types.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates a universal coating system where the polymeric matrix serves multiple functions: providing structural stability, presenting charged surfaces for electrostatic interaction, incorporating cell-adhesive proteins, and maintaining porosity for nutrient diffusion. This multi-functional design enables the same coating to support diverse cell types for long-term culturing.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The coatings provide a stable and adherent surface for cells, allowing for long-term culture and differentiation without significant material loss, enhancing cell viability and maintaining attachment over time.

Implementation Method 1

The polymeric coatings of the present invention include a non-biodegradable polymer having pendent amine groups and one or more latent reactive groups that are used to covalently bind the polymer to the surface of an article

Methodology Applied

Scientific EffectCovalent bonding: Chemical Bonding

Data Source

PatentUS11147902B2Polymeric coatings and methods for cell attachment

Publication Date: 2021.10.19 SURMODICS COATINGS LLC

AI summary

The invention provides cell-adherent polymeric coatings for articles, the coating including a synthetic, non-biodegradable polymer having a plurality of pendent amine groups, wherein the polymer is covalently immobilized on the article via latent reactive groups. The invention also provides methods for the long-term attachment of cells using the polymeric coatings.