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Method of producing retinal pigment epithelial cell sheet

a cell sheet and retinal pigment technology, applied in the field of cell sheet production, can solve the problems of poor engraftment of transplanted cells, inability to provide therapeutic effect for exudative or atrophic forms, and high risk of surgery, and achieves superior engraftment rate and function, convenient transplantation, and easy preparation and stably.

Inactive Publication Date: 2018-06-21
RIKEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention enables the easy and stable preparation of a retinal pigment epithelial cell sheet with a basement membrane on its surface. This sheet has superior engraftment rate and functionality, making it useful for transplantation purposes. Particularly, when the cells used for culture are derived from iPS cells, rejection in transplantation can be avoided by utilizing the patients' own cells as a source.

Problems solved by technology

However, the aforementioned means cannot provide therapeutic effectiveness for the exudative or atrophic form that has progressed to the advanced atrophy or lack of retinal pigment epithelium (RPE).
It has been reported that transplantation of retinal pigment epithelial cells obtained from human fetus in the form of a cell suspension shows poor engraftment of the transplanted cells.
In addition, the method utilizing a cadaveric eye has been pointed out to include an ethical problem.
However, this method places an extremely high burden on patients and an extremely high risk of surgery.
While an attempt has been made to utilize the patient's own iris pigment epithelial cells collected from the patient with age-related macular degeneration for the transplantation instead of retinal pigment epithelial cells, the upper limit of the final eyesight is low and a sufficient effect has not been obtained, and moreover, the burden and risk of utilizing the patient's own cell are high (non-patent document 2).
Thus, conventional treatment methods using cells collected from a cadaveric eye or the patient's own cells are not practical in terms of ethics, safety, effect and the like, and a retinal pigment epithelial cell truly usable for a transplantation treatment has been desired.
However, an artificial membrane is feared to be a disorder for engraftment in transplantation and functional maintenance of the body.
While an artificial membrane with a less biological response has also been developed, it is not suitable for transplantation since it problematically induces inflammation and rejection associated therewith, which are caused by the differences from the basement membrane produced by the cell itself in the composition, properties, rigidity and the like.
However, it is only for experimental model use wherein retinal pigment epithelial cells and immortalized line derived from a living organism are / is made into a sheet in a container and directly utilized, and it has not yet enabled actual recovery of a retinal pigment epithelial cell sheet provided with a basement membrane as in living organisms from a container (non-patent document 4).
Such method of detaching cells by exfoliation cannot stabilize the shape and size of the sheet, basement membrane and the like, causes much damage on the retinal pigment epithelial cells by exfoliation, and causes, in most cases, disintegration of the shape of the sheet and scattered cells due to the exfoliation, thus failing to provide a cell sheet usable for transplantation and the like (non-patent document 5).
Moreover, to increase the gel strength, a crosslinking agent needs to be added separately, which makes the method far from convenient and rapid (patent document 1).
As the situation now stands, production of a retinal pigment epithelial cell sheet, which is therapeutically effective for retinal diseases such as age-related macular degeneration and the like, and convenient and stable to prepare, has still been a problem.

Method used

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  • Method of producing retinal pigment epithelial cell sheet

Examples

Experimental program
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Effect test

production example 1

al Pigment Epithelial Cells

[0058]As the retinal pigment epithelial cells to be used for sheeting in the following Example 1, used were mature retinal pigment epithelial cells (253G1, K11PD2, 59M8, 59SV2, 59SV3, 59SV9, 46a, K21EV15, 101EV3, K11EV9, 454E2) obtained by inducing differentiation of iPS cell, and retinal pigment epithelial cells (hES, CMK6) obtained by inducing differentiation of ES cell, according to the method described in Neuroscience Letters 458 (2009) 126-131.

[0059]253G1 is a retinal pigment epithelial cell obtained by inducing differentiation of human iPS cell derived from a healthy human, and K11PD2 and 59M8 are retinal pigment epithelial cells induced to differentiate from human iPS cells derived from retinitis pigmentosa patients different from each other. The iPS cell were established by a method including introducing Oct3 / 4, Sox2, Klf4 and c-Myc genes into human skin-derived fibroblasts using retrovirus, according to the method described in Cell 131, 861-872, 2...

example 1

n Method of Retinal Pigment Epithelial Cell Sheet

[0064]A: Swine tendon-derived acid-soluble Type-I collagen Cellmatrix I-A (Nitta Gelatin, 3.0 mg / ml), B: concentrated culture medium at 5-fold concentration [DMEM / F12 (Invitrogen, 12500-062, 3 g) was dissolved in MilliQ water, and total volume (50 ml) was filter-treated], and C: buffer for reconstitution [1N NaOH (50 mM, 5 ml), NaHCO3 (260 mM, 2.2 g) and HEPES (200 mM, 4.77 g) were dissolved in MilliQ water, and total volume (100 ml) was filter-treated] were prepared. Under cooling, B (2 vol) was mixed (pale-yellow) with A (7 vol) without bubbling. Then, C (1 vol) was added and the mixture was mixed (pale-pink) to give a 0.21% collagen gel mixed solution.

[0065]The 0.21% collagen gel mixed solution (200 μl) was added into the insert of a 12 mm transwell insert (0.4 μm Pore Polyester membrane; Cornig, 3460), and the mixture was incubated at 37° C. for 30 min. Then, F10-10% FBS [F-10 (Sigma, N6908, 445 ml), FBS (50 ml), Penicilin-Strepto...

example 2

n Method of Retinal Pigment Epithelial Cell Sheet (Kind of Collagen)

[0067]In the same manner as in Example 1 except that, in the step of producing a cell sheet using 253G1 (iPS-retinal pigment epithelial cells) in Example 1, (A) swine skin-derived Type-I collagen TE (special order product: mainly containing Type-I collagen, a small quantity of Type-III collagen, Nitta Gelatin, 5 mg / ml) was used as 0.35% collagen mixed solution / well, (B) swine tendon-derived Type-I collagen T-1002 (special order product: Type-I collagen, Nitta Gelatin, 5.1 mg / ml) was used as 0.35% collagen mixed solution / well, (C) FITC-labeled collagen I (Chondrex, 1 mg / ml) was used as 0.07% collagen mixed solution / well, (D) FITC-labeled collagen I (special order, Chondrex, 3 mg / ml) was used as 0.21% collagen mixed solution / well, (E) atelocollagen (KOKEN, 3 mg / ml) was used as 0.21% collagen mixed solution / well, and (F) permeability collagen membrane for cell culture (KOKEN) was used, respectively, instead of swine te...

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Abstract

The present invention provides a method of producing a cell sheet including the following steps(1) seeding and culturing retinal pigment epithelial cells on a collagen gel to form a cell sheet composed of the retinal pigment epithelial cells, and(2) degrading the collagen gel with collagenase to detach the cell sheet composed of the retinal pigment epithelial cells, and the like.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This patent application is a continuation of copending U.S. patent application Ser. No. 14 / 001,108, filed on Aug. 22, 2013, which is the U.S. national phase of International Patent Application No. PCT / JP2012 / 054631, filed Feb. 24, 2012, which claims the benefit of Japanese Patent Application No. 2011-040130, filed on Feb. 25, 2011, which are incorporated by reference in their entireties herein.TECHNICAL FIELD[0002]The present invention relates to a production method of a cell sheet, comprising seeding retinal pigment epithelial cells on a collagen gel. The present invention also relates to a cell sheet for transplantation, comprising a cell layer formed from retinal pigment epithelial cells and a basement membrane.BACKGROUND ART[0003]At present, age-related macular degeneration (AMD) is one of the major causative diseases of legal blindness in advanced countries, and mainly seen in elderly citizens over 50 years of age. Age-related macula...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12N5/079G01N33/50A61K35/00
CPCC12N2506/02C12N2509/00C12N2506/45C12N2533/54A61K35/00G01N33/5005C12N5/0621A61P27/02A61L27/38A61F2/14C12N5/0602
Inventor TAKAHASHI, MASAYOOKAMOTO, SATOSHIKAMAO, HIROYUKI
Owner RIKEN
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