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Du Y, Yan B. Ocular immune privilege and retinal pigment epithelial cells. J Leukoc Biol 2023; 113:288-304. [PMID: 36805720 DOI: 10.1093/jleuko/qiac016] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Indexed: 02/04/2023] Open
Abstract
The ocular tissue microenvironment is immune-privileged and uses multiple immunosuppressive mechanisms to prevent the induction of inflammation. The retinal pigment epithelium plays an essential role in ocular immune privilege. In addition to serving as a blood barrier separating the fenestrated choriocapillaris from the retina, the retinal pigment epithelium is a source of immunosuppressive cytokines and membrane-bound negative regulators that modulate the activity of immune cells within the retina. This article reviews the current understanding of how retinal pigment epithelium cells mediate immune regulation, focusing on the changes under pathologic conditions.
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Affiliation(s)
- Yuxiang Du
- Institute of Precision Medicine, Jining Medical University, No. 133, Hehua Road, Taibaihu New District, Jining, Shandong 272067, People's Republic of China
| | - Bo Yan
- Institute of Precision Medicine, Jining Medical University, No. 133, Hehua Road, Taibaihu New District, Jining, Shandong 272067, People's Republic of China
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Sugita S, Hono A, Fujino S, Futatsugi Y, Yunomae Y, Shimizu N, Takahashi M. Detection of Mycoplasma Contamination in Transplanted Retinal Cells by Rapid and Sensitive Polymerase Chain Reaction Test. Int J Mol Sci 2021; 22:ijms222212555. [PMID: 34830437 PMCID: PMC8617609 DOI: 10.3390/ijms222212555] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/18/2021] [Accepted: 11/19/2021] [Indexed: 12/14/2022] Open
Abstract
Contamination of cells/tissues by infectious pathogens (e.g., fungi, viruses, or bacteria, including mycoplasma) is a major problem in cell-based transplantation. In this study, we tested a polymerase chain reaction (PCR) method to provide rapid, simple, and sensitive detection of mycoplasma contamination in laboratory cultures for clinical use. This mycoplasma PCR system covers the Mycoplasma species (spp.) listed for testing in the 17th revision of the Japanese Pharmacopoeia, and we designed it for use in transplantable retinal cells. Here, we analyzed mycoplasma contamination in induced pluripotent stem cell (iPS cell)-derived transplantable retinal pigment epithelium (RPE) cells. In the spike tests to RPE cells with nine species of class Mollicutes bacteria, including seven Mycoplasma spp. and one of each Acholeplasma spp. and Ureaplasma spp., contamination at the concentration of 100 and 10 CFU/mL were detected with 100% probability in all cases, while 1 CFU/mL had a detection rate of 0–75%. DNA prepared from bacteria species other than class Mollicutes species was not detectable, indicating the specificity of this PCR. While iPS cells and iPS-RPE cells established in our laboratory were all negative by this PCR, some of the commercially available cell lines were positive. Cells for transplantation should never have infection, as once pathogens are implanted into the eyes, they can cause severe intraocular inflammation. Thus, it is imperative to monitor for infections in the transplants, although generally, mycoplasma infection is difficult to detect.
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Affiliation(s)
- Sunao Sugita
- RIKEN Center for Biosystems Dynamics Research, Laboratory for Retinal Regeneration, 2-2-3 Minatojima-minamimachi, Kobe 650-0047, Japan; (A.H.); (S.F.); (Y.F.); (M.T.)
- Vision Care Inc., Kobe 650-0047, Japan
- Correspondence: or ; Tel.: +81-78-306-3305; Fax: +81-78-306-3303
| | - Ayumi Hono
- RIKEN Center for Biosystems Dynamics Research, Laboratory for Retinal Regeneration, 2-2-3 Minatojima-minamimachi, Kobe 650-0047, Japan; (A.H.); (S.F.); (Y.F.); (M.T.)
| | - Shoko Fujino
- RIKEN Center for Biosystems Dynamics Research, Laboratory for Retinal Regeneration, 2-2-3 Minatojima-minamimachi, Kobe 650-0047, Japan; (A.H.); (S.F.); (Y.F.); (M.T.)
| | - Yoko Futatsugi
- RIKEN Center for Biosystems Dynamics Research, Laboratory for Retinal Regeneration, 2-2-3 Minatojima-minamimachi, Kobe 650-0047, Japan; (A.H.); (S.F.); (Y.F.); (M.T.)
| | - Yuta Yunomae
- Center for Stem Cell and Regenerative Medicine, Tokyo Medical and Dental University, Tokyo 113-8510, Japan; (Y.Y.); (N.S.)
- Nissui Pharmaceutical Co., Ltd., Tokyo 110-8736, Japan
| | - Norio Shimizu
- Center for Stem Cell and Regenerative Medicine, Tokyo Medical and Dental University, Tokyo 113-8510, Japan; (Y.Y.); (N.S.)
| | - Masayo Takahashi
- RIKEN Center for Biosystems Dynamics Research, Laboratory for Retinal Regeneration, 2-2-3 Minatojima-minamimachi, Kobe 650-0047, Japan; (A.H.); (S.F.); (Y.F.); (M.T.)
- Vision Care Inc., Kobe 650-0047, Japan
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Sugita S, Mandai M, Kamao H, Takahashi M. Immunological aspects of RPE cell transplantation. Prog Retin Eye Res 2021; 84:100950. [PMID: 33482342 DOI: 10.1016/j.preteyeres.2021.100950] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 01/04/2021] [Accepted: 01/11/2021] [Indexed: 01/12/2023]
Abstract
Retinal pigment epithelial (RPE) cells have several functions, including support of the neural retina and choroid in the eye and immunosuppression. Cultured human RPE cells directly suppress inflammatory immune cells. For instance, they directly suppress the activation of T cells in vitro. In contrast, transplanted allogeneic human RPE cells are rejected by bystander immune cells such as T cells in vivo. Recently, human embryonic stem cell-derived RPE cells have been used in several clinical trials, and human induced pluripotent stem cell (iPSC)-RPE cells have also been tested in our clinical study in patients with retinal degeneration. Major safety concerns after stem cell-based transplantation surgery include hyper-proliferation, tumorigenicity, or ectopic tissue formation, but these events have currently not been seen in any of these patients. However, if RPE cells are allogeneic, there are concerns about immune rejection issues that have been raised in previous clinical trials. We therefore performed a preclinical study of allogeneic iPSC-RPE cell transplantation in animal rejection models. We then conducted autogenic or allogeneic iPSC-RPE cell transplantation in clinical studies of patients with age-related macular degeneration. In this review, we focus on immunological studies of RPE cells, including iPSC-derived cells. iPSC-RPE cells have unique inflammatory (immunosuppressive and immunogenic) characteristics like primary cultured RPE cells. The purpose of this review is to summarize the current findings obtained from preclinical (basic research) and clinical studies in iPSC-RPE cell transplantation, especially the immunological aspects.
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Affiliation(s)
- Sunao Sugita
- Laboratory for Retinal Regeneration, Laboratory for Retinal Regeneration, RIKEN Center for Biosystems Dynamics Research Kobe, Japan; Department of Ophthalmology, Kobe City Eye Hospital, Kobe, Japan.
| | - Michiko Mandai
- Laboratory for Retinal Regeneration, Laboratory for Retinal Regeneration, RIKEN Center for Biosystems Dynamics Research Kobe, Japan; Department of Ophthalmology, Kobe City Eye Hospital, Kobe, Japan
| | - Hiroyuki Kamao
- Department of Ophthalmology, Kawasaki Medical School, Okayama, Japan
| | - Masayo Takahashi
- Laboratory for Retinal Regeneration, Laboratory for Retinal Regeneration, RIKEN Center for Biosystems Dynamics Research Kobe, Japan; Department of Ophthalmology, Kobe City Eye Hospital, Kobe, Japan
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A Strategy for Personalized Treatment of iPS-Retinal Immune Rejections Assessed in Cynomolgus Monkey Models. Int J Mol Sci 2020; 21:ijms21093077. [PMID: 32349277 PMCID: PMC7247695 DOI: 10.3390/ijms21093077] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 04/25/2020] [Accepted: 04/26/2020] [Indexed: 11/17/2022] Open
Abstract
Recently, we successfully transplanted an autograft, or major histocompatibility complex (MHC)-matched allografts, from induced-pluripotent-stem-cell-derived retinal pigment epithelial (iPSC-RPE) cells in patients with age-related macular degeneration. However, there was an issue regarding immune rejection after transplantation. In this study, we established a preoperational in vitro "drug-lymphocytes-grafts immune reaction (Drug-LGIR)" test to determine the medication for immune rejection using host immunocompetent cells (lymphocytes) and transplant cells (target iPSC-RPE cells) together with different medications. The adequacy of the test was assessed by in vivo transplantation in monkey models together with medication based on in vitro data. In the results of Drug-LGIR tests, some drugs exhibited significant suppression of RPE cell-related allogeneic reactions, while other drugs did not, and the efficacy of each drug differed among the recipient monkeys. Based on the results of Drug-LGIR, we applied cyclosporine A or local steroid (triamcinolone) therapy to two monkeys, and successfully suppressed RPE-related immune rejections with RPE grafts, which survived without any signs of rejection under drug administration. We propose that our new preoperational in vitro Drug-LGIR test, which specifies the most efficacious medication for each recipient, is useful for controlling immune attacks with personalized treatment for each patient after retinal transplantation.
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Shariatzadeh M, Chandra A, Wilson SL, McCall MJ, Morizur L, Lesueur L, Chose O, Gepp MM, Schulz A, Neubauer JC, Zimmermann H, Abranches E, Man J, O’Shea O, Stacey G, Hewitt Z, Williams DJ. Distributed automated manufacturing of pluripotent stem cell products. THE INTERNATIONAL JOURNAL, ADVANCED MANUFACTURING TECHNOLOGY 2020; 106:1085-1103. [PMID: 31983799 PMCID: PMC6954896 DOI: 10.1007/s00170-019-04516-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 09/27/2019] [Indexed: 05/04/2023]
Abstract
Establishing how to effectively manufacture cell therapies is an industry-level problem. Decentralised manufacturing is of increasing importance, and its challenges are recognised by healthcare regulators with deviations and comparability issues receiving specific attention from them. This paper is the first to report the deviations and other risks encountered when implementing the expansion of human pluripotent stem cells (hPSCs) in an automated three international site-decentralised manufacturing setting. An experimental demonstrator project expanded a human embryonal carcinoma cell line (2102Ep) at three development sites in France, Germany and the UK using the CompacT SelecT (Sartorius Stedim, Royston, UK) automated cell culture platform. Anticipated variations between sites spanned material input, features of the process itself and production system details including different quality management systems and personnel. Where possible, these were pre-addressed by implementing strategies including standardisation, cell bank mycoplasma testing and specific engineering and process improvements. However, despite such measures, unexpected deviations occurred between sites including software incompatibility and machine/process errors together with uncharacteristic contaminations. Many only became apparent during process proving or during the process run. Further, parameters including growth rate and viability discrepancies could only be determined post-run, preventing 'live' corrective measures. The work confirms the critical nature of approaches usually taken in Good Manufacturing Practice (GMP) manufacturing settings and especially emphasises the requirement for monitoring steps to be included within the production system. Real-time process monitoring coupled with carefully structured quality systems is essential for multiple site working including clarity of decision-making roles. Additionally, an over-reliance upon post-process visual microscopic comparisons has major limitations; it is difficult for non-experts to detect deleterious culture changes and such detection is slow.
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Affiliation(s)
- Maryam Shariatzadeh
- Centre for Biological Engineering, Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU UK
| | - Amit Chandra
- Centre for Biological Engineering, Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU UK
- Present Address: Yposkesi, 26, rue Henri Auguste-Desbruères, 91100 Corbeil-Essonnes, France
| | - Samantha L Wilson
- Centre for Biological Engineering, Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU UK
| | - Mark J McCall
- Centre for Biological Engineering, Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU UK
| | - Lise Morizur
- CECS/I-STEM, 28, rue Henri Auguste-Desbruères, 91100 Corbeil-Essonnes, France
| | - Léa Lesueur
- CECS/I-STEM, 28, rue Henri Auguste-Desbruères, 91100 Corbeil-Essonnes, France
| | - Olivier Chose
- CECS/I-STEM, 28, rue Henri Auguste-Desbruères, 91100 Corbeil-Essonnes, France
| | - Michael M. Gepp
- Fraunhofer Institute for Biomedical Engineering (IBMT), Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany
- Fraunhofer Project Center for Stem Cell Process Engineering, Neunerplatz 2, 97082 Würzburg, Germany
| | - André Schulz
- Fraunhofer Institute for Biomedical Engineering (IBMT), Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany
- Present Address: Knappschaft Eye Clinic Sulzbach, An der Klinik 10, 66280 Sulzbach, Germany
| | - Julia C. Neubauer
- Fraunhofer Institute for Biomedical Engineering (IBMT), Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany
- Fraunhofer Project Center for Stem Cell Process Engineering, Neunerplatz 2, 97082 Würzburg, Germany
| | - Heiko Zimmermann
- Fraunhofer Institute for Biomedical Engineering (IBMT), Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany
- Fraunhofer Project Center for Stem Cell Process Engineering, Neunerplatz 2, 97082 Würzburg, Germany
- Saarland University, 66123 Saarbruecken, Germany
- Universidad Católica del Norte, Coquimbo, Chile
| | - Elsa Abranches
- NISBC, Blanche Lane, South Mimms, Potters Bar, EN6 3QG UK
| | - Jennifer Man
- NISBC, Blanche Lane, South Mimms, Potters Bar, EN6 3QG UK
- Present Address: Oxfordshire, UK
| | - Orla O’Shea
- NISBC, Blanche Lane, South Mimms, Potters Bar, EN6 3QG UK
| | - Glyn Stacey
- NISBC, Blanche Lane, South Mimms, Potters Bar, EN6 3QG UK
- Present Address: Adaptimmune, 60 Jubilee Avenue, Milton Park, Abingdon, Oxfordshire OX14 4RX UK
| | - Zoe Hewitt
- Centre for Stem Cell Biology (CSCB), University of Sheffield, Western Bank, Sheffield, S10 2TN UK
| | - David J Williams
- Centre for Biological Engineering, Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU UK
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