These results strongly support that the hiPSCs derived from T-cells can be used as a model of neurological disease by using our differentiation protocol.
Tokyo, Japan (PRWEB UK) 15 March 2016
Neurological disease research, such as on Parkinson’s disease, relies on animal models and immortalized neural cell lines because the central nervous system of patients is not accessible for invasive examination. Cultured neural stem cells could provide an alternative that is closer to the biology of the patient in question. However, due to the epigenetic memories of iPSCs, efficient preparation of neural stem cells requires human induced pluripotent stem cells (iPSCs) usually derived from skin fibroblasts harvested from patient skin biopsies, which can lead to bleeding, scarring and infection. Now researchers from a collaboration of universities and institutions in Japan have demonstrated the potential efficacy of a less invasive alternative.
“T cells can be obtained non-invasively, are easily stored and efficiently reprogrammed, and might therefore be an ideal source of patient-specific iPSCs,” explain Juntendo University’s Wado Akamatsu and Keio University’s Hideyuki Okano, and colleagues in their latest report. However the snag is that the source of stem cells seems to affect what cells they are likely to differentiate into. T cells are a type of lymphocyte or white blood cell and the researchers obtained very few neural cells from T cell-derived iPSCs cultured in standard embryoid bodies compared with the usual fibroblast-derived iPSCs.
To encourage differentiation into neural cells, the researchers tried converting the iPSCs directly into neural stem cells as neurospheres – culture systems of free-floating neural cells - instead of embryoid bodies that contain cells of other germ layers. By using this protocol, T cell-derived iPSCs efficiently differentiated into neural cells as well as fibroblast-derived iPSCs. Neurospheres generated from T cell-derived iPSCs were differentiated into neurons and various neuronal subtypes in similar quantities to those from fibroblast-derived iPSCs.
Furthermore, the researchers confirmed that iPSCs derived from the T cells of patients suffering from juvenile Parkinson’s disease (PARK2) exhibited impaired mitochondrial phenotypes that the team had previously reported using the fibroblast-derived iPSCs derived from this patient.
“These results strongly support that the hiPSCs derived from T-cells can be used as a model of neurological disease by using our differentiation protocol,” state Wado Akamatsu and Hideyuki Okano and colleagues in their latest report.
Induced pluripotent stem cells
Induced pluripotent stem cells (iPS cells or iPSCs) are pluripotent stem cells that can be induced from somatic cells by cellular reprogramming. The original set of reprogramming factors (so-called as Yamanaka factors) are the genes Oct4 (Pou5f1), Sox2, cMyc, and Klf4. So far, it has been reported that each of these factors can be functionally substituted by other transcription factors, miRNAs, small molecules, or proteins.
These are three-dimensional aggregates of embryonic pluripotent stem cells. They contain the cells from all three germ layers and are readily scalable because they form in suspension making them useful for culturing large yields of cells. In contrast, the neurosphere culture used by Okano, Akamatsu and collaborators are similar structures but comprising neural cells.
In Parkinson’s disease (PD), mutation of a specific gene is the cause of PD (familial PD [FPD]) in approximately 10% of PD patients, whereas the other 90% of patients are called sporadic PD. Particularly, understanding the causes of sporadic PD may require statistical approaches that require large numbers of cell lines, further raising the demand for less invasive approaches to gathering neural cell models.
Takuya Matsumoto,1,2,13 Koki Fujimori,1,13 Tomoko Andoh-Noda,1,3 Takayuki Ando,1 Naoko Kuzumaki,1,4Manabu Toyoshima,5 Hirobumi Tada,6 Kent Imaizumi,1 Mitsuru Ishikawa,1 Ryo Yamaguchi,1,7 Miho Isoda,1,7Zhi Zhou,1 Shigeto Sato,8 Tetsuro Kobayashi,9 Manami Ohtaka,10 Ken Nishimura,10,11 Hiroshi Kurosawa,3Takeo Yoshikawa,5 Takuya Takahashi,6 Mahito Nakanishi,10 Manabu Ohyama,9,14 Nobutaka Hattori,8Wado Akamatsu,1,12,* and Hideyuki Okano1,* Functional Neurons Generated from T Cell-Derived Induced Pluripotent
Stem Cells for Neurological Disease Modeling, Stem Cell Reports, vol. 6, pp.422–435, March 2016.
Department of Physiology, Keio University School of Medicine, Shinjuku-ku, Tokyo 160-8582, Japan
Institute for Innovation, Ajinomoto Co., Inc., Kawasaki-ku, Kanagawa 210-8681, Japan
Division of Medicine and Engineering Science, University of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Kofu, Yamanashi 400-8511, Japan
Department of Pharmacology, Hoshi University, Pharmacy and Pharmaceutical Sciences, Shinagawa-ku, Tokyo 142-8501, Japan
Laboratory for Molecular Psychiatry, RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan
Department of Physiology, Yokohama City University Graduate School of Medicine, Kanazawa-ku, Kanagawa 236-0027, Japan
Regenerative & Cellular Medicine Office, Sumitomo Dainippon Pharma Co., Ltd, Chuo-ku, Kobe 650-0047, Japan
Department of Neurology, Juntendo University School of Medicine, Bunkyo-ku, Tokyo 113-8431, Japan
Department of Dermatology, Keio University, School of Medicine, Shinjuku-ku, Tokyo 160-8582, Japan
Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
Laboratory of Gene Regulation, University of Tsukuba, Faculty of Medicine, Tsukuba, Ibaraki 305-8575, Japan
Center for Genomic and Regenerative Medicine, Juntendo University, School of Medicine, Bunkyo-ku, Tokyo 113-8431, Japan
Present address: Department of Dermatology, Kyorin University School of Medicine, Mitaka, Tokyo 181-8681, Japan
About Juntendo University
The mission of Juntendo University is to strive for advances in society through education, research, and healthcare, guided by the motto “Jin – I exist as you exist” and the principle of “Fudan Zenshin - Continuously Moving Forward”. The spirit of “Jin”, which is the ideal of all those who gather at Juntendo University, entails being kind and considerate of others. The principle of “Fudan Zenshin” conveys the belief of the founders that education and research activities will only flourish in an environment of free competition. Our academic environment enables us to educate outstanding students to become healthcare professionals patients can believe in, scientists capable of innovative discoveries and inventions, and global citizens ready to serve society.
Juntendo was originally founded in 1838 as a Dutch School of Medicine at a time when Western medical education was not yet embedded as a normal part of Japanese society. With the creation of Juntendo, the founders hoped to create a place where people could come together with the shared goal of helping society through the powers of medical education and practices. Their aspirations led to the establishment of Juntendo Hospital, the first private hospital in Japan. Through the years the institution’s experience and perspective as an institution of higher education and a place of clinical practice has enabled Juntendo University to play an integral role in the shaping of Japanese medical education and practices. Along the way the focus of the institution has also expanded, now consisting of four undergraduate programs and three graduate programs, the university specializes in the fields of health and sports science and nursing health care and sciences, as well as medicine. Today, Juntendo University continues to pursue innovative approaches to international level education and research with the goal of applying the results to society.
About Keio University
Keio University is not merely a place for academic pursuit. Its mission is to be a constant source of honorable character and a paragon of intellect and morals for the entire nation and for each member to apply this spirit to elucidate the essence of family, society, and nation. They will not only articulate this essence in words, but also demonstrate it in their actions, and by so doing make Keio a leader of society.
About Keio University School of Medicine
Formally founded in 1917, Keio University School of Medicine is regarded as one of Japan’s top medical schools. Its long-standing reputation for excellence stems from its unique history and its leading role in promoting the practice of advanced Western medicine in Japan. The school’s leadership in this area is evidenced by the fact that it has produced two presidents of the Japan Medical Association and one of the two Japanese who have been presidents of the World Medical Association. The School of Medicine has established a formidable reputation in the international medical community, not only for its hospital — the largest university hospital in Japan — but also for its promotion of excellence in medical research through the prestigious annual Keio Medical Science Prize.
As it approaches its centenary, the school will build on its past achievements to play a leading role in addressing such global problems as rapidly ageing populations. The construction of a new state-of-the-art hospital building will be key to promoting ‘Keio Medicine’, an important feature of which is the unique interdisciplinary team approach to patient-oriented medical care currently being realized at Keio.