scholarly journals A Survey of the Molecular Basis for the Generation of Functional Dopaminergic Neurons from Pluripotent Stem Cells: Insights from Regenerative Biology and Regenerative Medicine

10.5772/55442 ◽  
2013 ◽  
Author(s):  
Kaneyasu Nishimura ◽  
Yoshihisa Kitamura ◽  
Kiyokazu Agata ◽  
Jun Takahashi
Keyword(s):  
Stem Cells ◽  
Regenerative Medicine ◽  
Pluripotent Stem Cells ◽  
Dopaminergic Neurons ◽  
Molecular Basis

scholarly journals Induction of functional hypothalamus and pituitary tissues from pluripotent stem cells for regenerative medicine

2020 ◽  
Author(s):  
Mayuko Kano ◽  
Hidetaka Suga ◽  
Hiroshi Arima
Keyword(s):  
Stem Cells ◽  
Regenerative Medicine ◽  
Pluripotent Stem Cells ◽  
Hormone Replacement ◽  
Three Dimensional ◽  
Embryonic Stem ◽  
Hormone Deficiency ◽  
Adrenal Crisis ◽  
Mouse Escs

Abstract The hypothalamus and pituitary have been identified to play essential roles in maintaining homeostasis. Various diseases can disrupt the functions of these systems, which can often result in serious lifelong symptoms. The current treatment for hypopituitarism involves hormone replacement therapy. However, exogenous drug administration cannot mimic the physiological changes that are a result of hormone requirements. Therefore, patients are at a high risk of severe hormone deficiency, including adrenal crisis. Pluripotent stem cells (PSCs) self-proliferate and differentiate into all types of cells. The generation of endocrine tissues from PSCs has been considered as another new treatment for hypopituitarism. Our colleagues established a three-dimensional culture method for embryonic stem cells (ESCs). In this culture, the ESC-derived aggregates exhibit self-organization and spontaneous formation of highly ordered patterning. Recent results have shown that strict removal of exogenous patterning factors during early differentiation efficiently induces rostral hypothalamic progenitors from mouse ESCs. These hypothalamic progenitors generate vasopressinergic neurons, which release neuropeptides upon exogenous stimulation. Subsequently, we reported adenohypophysis tissue self-formation in three-dimensional cultures of mouse ESCs. The ESCs were found to differentiate into both non-neural oral ectoderm and hypothalamic neuroectoderm in adjacent layers. Interactions between the two tissues appear to be critically important for in vitro induction of a Rathke's pouch-like developing embryo. Various endocrine cells were differentiated from non-neural ectoderm. The induced corticotrophs efficiently secreted adrenocorticotropic hormone when engrafted in vivo, which rescued hypopituitary hosts. For future regenerative medicine, generation of hypothalamic and pituitary tissues from human PSCs is necessary. We and other groups succeeded in establishing a differentiation method with the use of human PSCs. Researchers could use these methods for models of human diseases to elucidate disease pathology or screen potential therapeutics.

scholarly journals Advances in Pluripotent Stem Cells: History, Mechanisms, Technologies, and Applications

2019 ◽  
Vol 16 (1) ◽  
pp. 3-32 ◽  
Author(s):  
Gele Liu ◽  
Brian T. David ◽  
Matthew Trawczynski ◽  
Richard G. Fessler
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Regenerative Medicine ◽  
Pluripotent Stem Cells ◽  
Cell Biology ◽  
Ethical Issues ◽  
Three Dimensional ◽  
Future Research ◽  
Cell Technology

AbstractOver the past 20 years, and particularly in the last decade, significant developmental milestones have driven basic, translational, and clinical advances in the field of stem cell and regenerative medicine. In this article, we provide a systemic overview of the major recent discoveries in this exciting and rapidly developing field. We begin by discussing experimental advances in the generation and differentiation of pluripotent stem cells (PSCs), next moving to the maintenance of stem cells in different culture types, and finishing with a discussion of three-dimensional (3D) cell technology and future stem cell applications. Specifically, we highlight the following crucial domains: 1) sources of pluripotent cells; 2) next-generation in vivo direct reprogramming technology; 3) cell types derived from PSCs and the influence of genetic memory; 4) induction of pluripotency with genomic modifications; 5) construction of vectors with reprogramming factor combinations; 6) enhancing pluripotency with small molecules and genetic signaling pathways; 7) induction of cell reprogramming by RNA signaling; 8) induction and enhancement of pluripotency with chemicals; 9) maintenance of pluripotency and genomic stability in induced pluripotent stem cells (iPSCs); 10) feeder-free and xenon-free culture environments; 11) biomaterial applications in stem cell biology; 12) three-dimensional (3D) cell technology; 13) 3D bioprinting; 14) downstream stem cell applications; and 15) current ethical issues in stem cell and regenerative medicine. This review, encompassing the fundamental concepts of regenerative medicine, is intended to provide a comprehensive portrait of important progress in stem cell research and development. Innovative technologies and real-world applications are emphasized for readers interested in the exciting, promising, and challenging field of stem cells and those seeking guidance in planning future research direction.

scholarly journals Ethics of research on stem cells and regenerative medicine: ethical guidelines in the Islamic Republic of Iran

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Leila Afshar ◽  
Hamid-Reza Aghayan ◽  
Jila Sadighi ◽  
Babak Arjmand ◽  
Seyed-Mahmoud Hashemi ◽  
...  
Keyword(s):  
Stem Cells ◽  
Regenerative Medicine ◽  
Pluripotent Stem Cells ◽  
Somatic Cells ◽  
Embryonic Stem ◽  
National Committee ◽  
Ethical Guideline ◽  
Ethical Guidelines ◽  
Ethical Considerations ◽  
Ethics Of Research

Abstract Background Regenerative medicine plays a major role in biomedicine, and given the ever-expanding boundaries of this knowledge, numerous ethical considerations have been raised. Main text Rapid advancement of regenerative medicine science and technology in Iran, emerged the Iranian National Committee for Ethics in Biomedical Research to develop a comprehensive national ethical guideline. Therefore, the present ethical guideline which comprises eleven chapters was developed in 2019 and approved in early 2020. The titles of these chapters were selected based on the ethical considerations of various aspects of the field of regenerative medicine: (1) ethical principles of research on stem cells and regenerative medicine; (2) ethical considerations for research on stem cells (embryonic stem cells, epiblast stem cells, tissue-specific stem cells, stem cells derived from transdifferentiation, induced pluripotent stem cells [iPSCs], germline pluripotent stem cells, germline stem cells, and somatic cell nuclear transfer [SCNT] stem cells); (3) ethical considerations for research on somatic cells in regenerative medicine (adult somatic cells, fetal tissue somatic cells, and somatic cells derived from pregnancy products [other than fetus]); (4) ethical considerations for research on gametes in regenerative medicine; (5) ethical considerations for research related to genetic manipulation (human and animal) in regenerative medicine; (6) ethical considerations for research on tissue engineering in regenerative medicine; (7) ethical considerations for pre-clinical studies in regenerative medicine; (8) ethical considerations for clinical trials in regenerative medicine; (9) ethical considerations for stem cells and regenerative medicine bio-banks; (10) ethical considerations for privacy and confidentiality; and (11) ethical considerations for obtaining informed consent. Conclusion This article discusses the process of developing the present ethical guidelines and its practical points. We hope that it can play an important worldwide role in advancing ethics of research on stem cells and regenerative medicine.

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