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Synthetic graft

A composition and compound technology, applied in the direction of eye implants, microorganisms, animal cells, etc., can solve the problems of uncharacterized, amnion lack of polymer structure scalability, etc.

Inactive Publication Date: 2012-05-09
THE UNIV OF READING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, amnion shows significant inter-sample and intra-sample variation in structure and chemical composition (Hopkinson, A. et al. Invest. Ophthalmol. Vis. Sci., 2006.47(10): p.4316-4322), and Not routinely characterized prior to clinical use
Most importantly, amniotic membrane as a substrate lacks the scalability of engineered polymeric constructs

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0107] Example 1: Isolation of Keratocytes Using the Initial Spheroid Formation Assay

[0108] Normal bovine eyes were obtained from a local abattoir (Chity Wholesale Abattoir, Guildford, UK) within 2 hours of death, transported to the laboratory at 4°C and used immediately. The corneoscleral button was incised using standard eye bank techniques. Briefly, corneal-scleral tissue was rinsed three times with Dulbecco's minimal essential medium (DMEM, GIBCO). After careful removal of the central cornea, excess sclera, iris, corneal endothelium, conjunctiva, and eye capsule, the remaining rim (limbal rim) is cut to approximately 25mm 2 small pieces. Limbal stromal keratocytes and epithelial cells were subsequently isolated from these sheets. For limbal stromal keratocyte isolation, limbal pieces were incubated overnight at 37°C with 0.02% collagenase (GIBCO). The remaining limbal stroma sheets were then collected and treated with 0.2% EDTA (Sigma, UK) for 5 minutes at 37°C, fol...

Embodiment 2

[0109] Example 2: Differentiation of sphere colonies

[0110] Initial spheres were formed from suspended limbal keratocytes and were transferred to glass coverslips coated with 50 μg / ml poly-L-lysine (Sigma, UK) and 10 μg / ml fibronectin (Sigma, UK) after 7 days in culture slices for microscopy studies. In order to promote the differentiation of limbal keratocytes, 1% fetal bovine serum was added to the basal medium, and the culture was continued for 7 days. The resulting differentiated keratocytes were digested in 0.25% trypsin and 0.02% EDTA (Sigma, UK) and 2.0 × 10 5 The density of cells is resuspended in basal medium.

[0111] When the limbic stroma was disaggregated into individual cells and cultured for 9 days, spheres of viable cells grew during this time. Photographs of representative spheres cultured at 5, 7, and 9 days, respectively, are in figure 1 Shown in A, 1B and 1C. Differentiated progeny from each initial sphere displayed typical fibroblast-like morphology...

Embodiment 3

[0112] Example 3: Formation of acellular collagen gels

[0113] Eagle's minimum essential Cell-free collagen gels were prepared with 4 mL of sterile rat tail type I collagen (First Link Ltd. West Midlands, UK) in medium (Gibco, Paisley, UK). The gel was cast into a rectangular model (33mm×13mm×4mm) and heated at 37°C in 0.5% CO 2 Freeze / stabilize for 30 minutes in the incubator. After solidification and incubation, the gel was compressed by a combination of compression and absorption using layers of nylon mesh and paper sheets (no additional wire mesh as used by Brown et al.). To achieve the compression of the gel, a layer of nylon mesh (50 μm mesh size) was placed on a double layer of absorbent paper, the collagen gel was placed on the nylon mesh and covered with a second nylon mesh, and a load of 50 g weight was added at room temperature Up to 5 minutes resulted in the formation of a flat collagen sheet (20-40 μm thick) protected between a double nylon mesh.

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Abstract

The present invention relates to the use of a plastically-compacted collagen gel as a substrate for the growth of corneal cells, particularly limbal corneal epithelial stem cells. Cells grown on such a substrate can be cultured to produce artificial ocular epithelia which can be used in ocular toxicity testing or for transplantation.

Description

technical field [0001] The present invention relates to plastic-compressed collagen gel (plastically-compacted collagen gel) as a method for corneal cells, especially limbal epithelial stem cells (limbal corneal epithelial stem cells, limbal corneal epithelial stem cells) Application of the growing substrate. Cells grown on such substrates can be cultured to produce artificial ocular epithelium or artificial corneal tissue, which can be used in ocular toxicity assays or for transplantation. Background technique [0002] Before commercialization, new drugs and cosmetics must be tested in eye toxicity tests such as the Draize rabbit eye irritation test in order to determine the toxicity potential of those new drugs / cosmetics. In this regard, the eye is used because it represents the most common exposure and chemical-sensitivity limit to our everyday environment. In such trials, thousands of rabbits are used each year, and the method of testing drugs and cosmetics on rabbit e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N5/079A61K35/44A61K35/12
CPCC12N5/0068C12N2502/1323A61L27/3839A61L2430/16C12N5/0621A61L27/24A61L27/52A01K2227/107C12N2533/52C12N2533/54A01K2267/03A61L27/3813A61K35/12A01K67/0271C12N2533/92A61L27/3895A61P27/02A61F2/14A61K35/44A61L27/38G01N33/5008
Inventor 切·康诺恩
Owner THE UNIV OF READING
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