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Osteogenic Composite Matrix, Method for the Production Thereof and Implant and Scaffold for Tissue Engineering Provided with a Coating Formed by Said Osteogenic Composite matrix

a composite matrix and osteogenic technology, applied in the field of osteogenic composite matrix, to achieve the effect of promoting and accelerating bone accumulation and bone growth

Inactive Publication Date: 2007-10-11
NEXILIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] It is the object of the present invention to specify a biocompatible and biodegradable matrix composite which promotes and accelerates bone accumulation and bone growth in the immediate environment and on the surface of implants coated with the matrix composite, and which can be used in particular for the coating of synthetic, metallic or ceramic implants. A further aim of the invention is a coating of carrier materials (scaffolds) for tissue engineering, which assists the production of hard tissue in vitro and subsequently in vivo.
[0035] The osteogenic matrix in -combination with a three-dimensional, degradable implant, which is implanted as a bone replacement, can advantageously accelerate the integration and the reconstruction of the implant and also the new bone formation. These implants can contain, for example, particulate or three-dimensional structures consisting of calcium phosphates, but also polymeric materials, as a basic component.
[0036] For tissue engineering, the osteogenic matrix composition in combination with a scaffold can be advantageous for proliferation and differentiation of the bone-forming cells. As a scaffold, all three-dimensional, porous structures of synthetic and / or natural polymers (e.g. collagen), ceramic or metal individually or in combination are possible, biodegradable scaffolds of polymer and / or ceramic being given preference.
[0037] By means of the osteogenic matrix composite, bone-forming factors, such as, for example, growth factors which are present in vivo, are bound to the surface of the implant after implantation and their activity is increased. Advantageously, different endogenous factors which are present at the implantation site are recruited by the implant coated with the osteogenic matrix composite.
[0041] The implant or scaffold coated according to the invention with an osteogenic matrix composite is delineated by the following advantages from the solutions known from the prior art:

Problems solved by technology

Moreover, such carriers should be biocompatible and biodegradable.
Further problems can result from the fact that receptors for BMP occur in many different tissues; the function of these growth factors is thus not limited to the bone.

Method used

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  • Osteogenic Composite Matrix, Method for the Production Thereof and Implant and Scaffold for Tissue Engineering Provided with a Coating Formed by Said Osteogenic Composite matrix
  • Osteogenic Composite Matrix, Method for the Production Thereof and Implant and Scaffold for Tissue Engineering Provided with a Coating Formed by Said Osteogenic Composite matrix
  • Osteogenic Composite Matrix, Method for the Production Thereof and Implant and Scaffold for Tissue Engineering Provided with a Coating Formed by Said Osteogenic Composite matrix

Examples

Experimental program
Comparison scheme
Effect test

working example 1

Fibril Structure after Fibrillogenesis under Various Conditions

[0055] For the generation of the osteogenic matrix composite, a solution of collagen monomers in 0.01 M acetic acid is prepared by stirring for 24 hours at 4° C. The collagen fibrils are subsequently formed in the presence of the noncollagenic components by a process of self-aggregation (fibrillogenesis) in aqueous phosphate buffer solutions at neutral pH and a temperature of 37° C.

[0056] The range for the formation of the fibrils is between 0.5 and 5 mg of collagen / ml and 0.1 to 5 mg of glycosaminoglycan / ml, 1 mg / ml of collagen and 0.2 mg / ml of GAG and 30 μg / ml of proteoglycan being the preferred conditions. The preferred fibrillogenesis parameters were a 30 mmol / l phosphate buffer pH 7.0, either with 135 mmol / l of NaCl or without NaCl addition.

[0057] Glycosaminoglycans or other matrix components are added to the collagen monomers before fibrillogenesis and thereby integrated at least partially into the resulting fib...

working example 2

Incorporation of Noncollagenic Components into Collagen Fibrils

[0061] For generation of the osteogenic matrix composite, a solution of collagen monomers in 0.01 M acetic acid is prepared by stirring at 4° C. for 24 hours. The collagen fibrils are subsequently formed by a process of self-aggregation (fibrillogenesis) in aqueous phosphate buffer solutions at neutral pH in the presence of the noncollagenic components. Formation conditions: 250 μg / ml of collagen, 37° C., 30 mmol / l of phosphate buffer pH 7.4 (buffer A) or 30 mmol / l of phosphate buffer pH 7.4 containing 135 mmol / l of NaCl (buffer B) with different chondroitin sulfate and decorin concentrations.

[0062] After washing and hydrolysis of the fibrils in 500 μl of 6 M HCl at 105° C. for 6 hours, decorin and chondroitin sulfate integrated into the fibrils was determined according to the method of Pieper et al. [Pieper J S, Hafmans T, Veerkamp J H, van Kuppevelt T H. Development of tailor-made collagen-glycosaminoglycan matrices:...

working example 3

Recruitment of Growth Factors by an Implant Coated with an Osteogenic Matrix Composite

[0065] Matrices composed and produced according to the invention can accelerate and improve bone formation and accumulation without the use of recombinant growth factors by the recruitment of endogenous growth factors. In the experiment, such a binding behavior can only be demonstrated using recombinant growth factors.

[0066] A sandblasted, cylindrical sample of TiAl6V4 having a diameter of 10 mm is cleaned with ethanol, acetone and water.

[0067] A solution of 1 mg / ml of bovine collagen type I in 0.01 M acetic acid is produced by stirring overnight at 4° C. Noncollagenic ECM components (glycosaminoglycan 30 μg / ml, proteoglycans 15 μg / ml) are added to this solution. The mixtures are treated with fibrillogenesis buffer (60 mmol / l of phosphate, 270 mmol / l of NaCl, pH 7.4) on ice and incubated at 37° C. for 18 h. The resulting fibrils are centrifuged off, washed, homogenized and resuspended to give a ...

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Abstract

The invention relates to an osteogenic composite matrix consisting of collagen and non-collagen components of an extracellular matrix (ECM-components), to a method for producing said matrix, to a method for producing an implant or a scaffold for tissue engineering which is provided with a coating formed by said osteogenic composite matrix and is used for stimulating and accelerating a hard tissue formation such as, for example the implant osseointegration in bones. The inventive osteogenic composite matrix comprises a collagen and at least one non-collagen ECM component or the derivatives thereof, wherein the collagen component consists of non-crosslinked collagen fibres produced by fibrillogenesis and the non-collagen ECM component or the derivatives thereof are integrated into said collagen fibres.

Description

TECHNICAL FIELD [0001] The invention relates to an osteogenic matrix composite of collagen and noncollagenic components of the extracellular matrix (ECM components), a method for its production, a method for the production of an implant or of a scaffold for tissue engineering having a coating of an osteogenic matrix composite, and implants and scaffolds for tissue engineering having a coating of the osteogenic matrix composite for the stimulation and accelerated formation of hard tissue, such as, for example, in the field of osseointegration of implants into bone. BACKGROUND ART [0002] In the tissue, the cells are embedded in the native extracellular matrix (ECM), which is an important part of the cellular environment. The native ECM is a highly ordered, tissue-specific network which consists of collagens, glycoproteins, proteoglycans and glycosaminoglycans (GAG). The composition for various tissue and for various stages of development is very different here, such that the respectiv...

Claims

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Application Information

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IPC IPC(8): A61K9/00A61J1/00A61L27/26A61L27/36C07K14/78A61L27/48
CPCA61L27/48A61L2430/02C08L89/06A61P43/00A61L27/26A61L27/36A61L27/00
Inventor SCHARNWEBER, DIETERWORCH, HARTMUTBIERBAUM, SUSANNE
Owner NEXILIS
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