Method for preparing porous scaffold for tissue engineering

Patent metadata

Field	Value
Publication number	US-9555164-B2
Application number	US-201514708996-A
Country	US
Kind code	B2
Filing date	May 11, 2015
Priority date	Oct 11, 2007
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

The present invention relates to a method for preparing a porous scaffold for tissue engineering. It is another object of the present invention to provide a porous scaffold obtainable by the method as above described, and its use for tissue engineering, cell culture and cell delivery. The method of the invention comprise the steps consisting of a) preparing an alkaline aqueous solution comprising an amount of at least one polysaccharide and one cross-linking agent b) freezing the aqueous solution of step a) c) sublimating the frozen solution of step b) characterized in that step b) is performed before the cross-linking of the polysaccharide occurs in the solution of step a).

First claim

The invention claimed is:

1. A porous scaffold obtainable by a method for preparing a porous scaffold consisting of the steps of
a) preparing an alkaline aqueous solution comprising an amount of pullulan and dextran and one cross-linking agent;
b) freezing the aqueous solution of step a);
c) sublimating the frozen solution of step b); and

wherein step b) is performed before the cross-linking of the pullulan and dextran and said cross linking occurs during the sublimation step c).

2. The porous scaffold according to claim 1 , wherein the cross-linking agent of the method for preparing said porous scaffold is selected from the group consisting of trisodium trimetaphosphate (STMP), phosphorus oxychloride (POCl3), epichlorohydrin, formaldehydes, water soluble carbodiimides, and glutaraldehydes.

3. The porous scaffold according to claim 1 , wherein the cross-linking agent of the method for preparing said porous scaffold is trisodium trimetaphosphate (STMP).

4. The porous scaffold according to claim 1 , wherein the aqueous solution of step a) of the method for preparing said porous scaffold is freeze-dried.

5. The porous scaffold according to claim 1 wherein the aqueous solution of step a) of the method for preparing said porous scaffold is freeze-dried under a pressure from 0.1 mBar to 6.5 mBar.

6. The porous scaffold according to claim 1 , wherein said scaffold is shaped.

7. The porous scaffold of claim 1 , wherein the size of the pores is comprised between 1 μm and 500 μm.

8. The porous scaffold according to claim 1 wherein the porosity is comprised between 4% and 50%.

9. The porous scaffold according to claim 1 for tissue engineering, 3D cell culture or cell delivery for therapeutic use.

10. A vascular substitute made with a scaffold of claim 1 .

11. Cartilage or bone implants made with a scaffold of claim claim 1 .

12. Method for evaluating the toxicity and/or pharmacology of a product comprising:
culturing cells on the porous scaffold according to claim 1 ;
contacting the cells with an amount of the product;
identifying an effect on the cells following the contacting with the product; and
determining the toxicity and/or pharmacology of the product based on the identified effect the product had on the cells.

13. A controlled release system of an active agent made with a scaffold as defined according to claim 1 .

Assignees

• Inserm (Institut Nat De La Sante Et De La Rech Medicale)
• Univ Paris 7—Denis Diderot

Inventors

• Le Visage Catherine
• Letourneur Didier
• Chaubet Frederic
• Autissier Aude

Classifications

• A61L27/507

  for artificial blood vessels (apparatus for applying cells on a blood vessel prosthesis A61F2/062) · CPC title

• A61L2300/21

  Acids · CPC title

• C08J9/28

  by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum · CPC title

• A61L27/3804

  characterised by specific cells or progenitors thereof, e.g. fibroblasts, connective tissue cells, kidney cells · CPC title

• C08B37/0018

  Pullulan, i.e. (alpha-1,4)(alpha-1,6)-D-glucan; Derivatives thereof · CPC title