Stem cell therapy has been taken as a highly promising area of future medicine due to its potential for providing new therapeutic modalities for debilitating, incurable diseases. In addition, stem cell therapy holds promise for its great industrial value due to the rapid growth of the market size. Recently, various types of stem cells such as induced pluripotent stem cells are being developed based on the conceptual revolution with regard to cell fate decisions. However, so far, most stem cell therapies have been performed using tissue-specific adult stem cells. Nevertheless, except for a few cases of stem cells such as hematopoietic stem cells that can regenerate hematopoietic tissue, a large proportion of stem cells, especially mesenchymal stromal cells, primarily work through paracrine functioning. The short life span of the injected stem cells and their paracrine mode of action pose a limitation to the maximum therapeutic efficacy that can be achieved from the current stem cell therapy model, warranting further research and development to enhance their efficacy. Despite the fact that stem cell therapies largely remain in the research stage, the public has expectations of rapid results and even fanaticism, leading to unauthorized stem cell practices and medical tourism. Moreover, the temptation to expedite the industrialization of stem cell therapeutics by simplifying the authorization process could increase the risk of endangering the rights of patients. Thus, stem cell therapy can become a 'hope' when society can overcome the stem cell 'hype'.
Adult Stem Cells ; Hematopoietic Stem Cells ; Human Rights ; Humans ; Induced Pluripotent Stem Cells ; Medical Tourism ; Mesenchymal Stromal Cells ; Stem Cells

The present study was aimed to investigate the expression relationship of Hippo signaling molecules and ovarian germline stem cell (OGSC) markers in the development schedule of OGSCs during ovarian aging in women and mice. The ovaries of 2-month-old mature (normal control) and 12-month-old (physiological ovarian aging) KM mice were sampled, and the ovarian cortex samples of young (postpuberty to 35 years old), middle age (36-50 years old) and menopausal period (51-60 years old) women were obtained with consent. The mice model of pathological ovarian aging was established by intraperitoneal injection of cyclophosphamide/busulfan (CY/BUS). HE staining was used to detect the changes of follicles at different stages, and the localization and expression changes of Hippo signaling molecules and OGSCs related factors (MVH/OCT4) were detected by immunohistochemistry and immunofluorescence staining. Western blot was used to detect the protein expression levels of the major molecules in the Hippo signaling pathway and OGSCs related factors. The results showed that there were not any normal follicles, but a few atresia follicles in the ovaries from physiological and pathological ovarian aging mice. Compared with the normal control mice, both the physiological and pathological ovarian aging mice showed decreased protein expression levels of the main Hippo signaling molecules (pYAP1) and MVH/OCT4; Whereas only the pathological ovarian aging mice showed increased ratio of pYAP1/YAP1. In comparison with the young women, the middle age and menopausal women showed looser structure of ovarian surface epithelium (OSE) and less ovarian cortical cells. The protein expression level of LATS2 in the OSE was the highest in young women, MST1 expression was the lowest in the menopausal period women, and the expression levels of YAP1 and pYAP1 were the highest in middle age women. Compared with the young women, the middle age and menopausal period women exhibited significantly decreased ratio of OSE pYAP1/YAP1, whereas there was no significant difference between them. The expression level of MVH protein in OSE from the young women was significantly higher than those of the middle age and menopausal period women. These results indicate that there is an expression relationship between the main molecules of Hippo signaling pathway and OGSCs related factors, which suggests that Hippo signaling pathway may regulate the expression levels of OGSCs related factors, thus participating in the process of physiological and pathological degeneration of ovarian.
Adaptor Proteins, Signal Transducing ; metabolism ; Adult ; Aging ; Animals ; Epithelium ; Female ; Humans ; Mice ; Middle Aged ; Octamer Transcription Factor-3 ; metabolism ; Oogonial Stem Cells ; metabolism ; Ovarian Follicle ; Ovary ; Phosphoproteins ; metabolism ; Protein-Serine-Threonine Kinases ; metabolism ; Signal Transduction ; Tumor Suppressor Proteins ; metabolism

Stem cells are undifferentiated cells capable of generating, sustaining, and replacing terminally differentiated cells and tissues. They can be isolated from embryonic as well as almost all adult tissues including skin, but are also generated through genetic reprogramming of differentiated cells. Preclinical and clinical research has recently tremendously improved stem cell therapy, being a promising treatment option for various diseases in which current medical therapies fail to cure, prevent progression or relieve symptoms. With the main goal of regeneration or sustained genetic correction of damaged tissue, advanced tissue-engineering techniques are especially applicable for many dermatological diseases including wound healing, genodermatoses (like the severe blistering disorder epidermolysis bullosa) and chronic (auto-)inflammatory diseases. This review summarizes general aspects as well as current and future perspectives of stem cell therapy in dermatology.
Adult ; Blister ; Dermatology* ; Epidermolysis Bullosa ; Humans ; Induced Pluripotent Stem Cells ; Regeneration ; Skin ; Stem Cells* ; Wound Healing

Osteoarthritis is a musculoskeletal disease representative of an aging society. As medical conditions are usually complicated in an aging population, osteoarthritis becomes more frequently encountered in the physician's office. There is a growing need, therefore, for physicians to pay attention to this common orthopedic condition. Cartilage degeneration, arthritic pain, and joint dysfunction are major manifestations of osteoarthritis, and degenerated cartilage is difficult to repair with conventional treatment modalities. Scientists and physicians have developed various therapeutic strategies, including the use of stem cells. Here, we discuss previous and current progress in cartilage regenerative therapy against osteoarthritis.
Adult Stem Cells ; Aging ; Cartilage ; Chondrogenesis ; Induced Pluripotent Stem Cells ; Joints ; Musculoskeletal Diseases ; Orthopedics ; Osteoarthritis ; Physicians' Offices ; Stem Cells

Stem cells are attracting attention as a key element in future medicine, satisfying the desire to live a healthier life with the possibility that they can regenerate tissue damaged or degenerated by disease or aging. Stem cells are defined as undifferentiated cells that have the ability to replicate and differentiate themselves into various tissues cells. Stem cells, commonly encountered in clinical or preclinical stages, are largely classified into embryonic, adult, and induced pluripotent stem cells. Recently, stem cell transplantation has been frequently applied to the treatment of pain as an alternative or promising approach for the treatment of severe osteoarthritis, neuropathic pain, and intractable musculoskeletal pain which do not respond to conventional medicine. The main idea of applying stem cells to neuropathic pain is based on the ability of stem cells to release neurotrophic factors, along with providing a cellular source for replacing the injured neural cells, making them ideal candidates for modulating and possibly reversing intractable neuropathic pain. Even though various differentiation capacities of stem cells are reported, there is not enough knowledge and technique to control the differentiation into desired tissues in vivo. Even though the use of stem cells is still in the very early stages of clinical use and raises complicated ethical problems, the future of stem cells therapies is very bright with the help of accumulating evidence and technology.
Adult ; Adult Stem Cells ; Aging ; Cell Differentiation ; Embryonic Stem Cells ; Humans ; Induced Pluripotent Stem Cells ; Musculoskeletal Pain ; Nerve Growth Factors ; Neuralgia ; Osteoarthritis ; Stem Cell Transplantation ; Stem Cells

We are now in the middle of stem cell war. Each country is trying to invest a large amount of funds into stem cell research. This is due to a potentiality of stem cells. Stem cells are capable of proliferating in an undifferentiated manner and are able to differentiate into a desired cell lineage under certain conditions. These abilities make stem cells an appealing source for cell replacement therapies (regenerative medicine), the study of developmental biology and drug/toxin screening. In addition to embryonic and adult stem cells, induced pluripotent stem (iPS) cells has been recently generated through reprogramming from adult tissue cells such as fibroblasts. This technique has opened up new avenues to generate patient- and disease-specific pluripotent stem cells. Human iPS cells may be useful for gaining valuable insight into the pathophysiology of disease, as well as for discovering for new prognostic biomarkers and drug screening. Moreover, the iPS cell technology may play a major role in immune-matched clinical application in the future. In this chapter, we introduce general characteristics of various stem cells, clinical application of stem cells and future perspectives.
Adult ; Adult Stem Cells ; Biomarkers ; Cell Lineage ; Developmental Biology ; Drug Evaluation, Preclinical ; Embryonic Stem Cells ; Fibroblasts ; Financial Management ; Humans ; Induced Pluripotent Stem Cells ; Mass Screening ; Pluripotent Stem Cells ; Regenerative Medicine ; Stem Cell Research ; Stem Cells

Stem cell research is a innovative technology that focuses on using undifferentiated cells able to self-renew through the asymmetrical or symmetrical divisions. Three types of stem cells have been studied in laboratory including embryonic stem cell, adult stem cells and induced pluripotent stem cells. Embryonic stem cells are pluripotent stem cells derived from the inner cell mass and it can give rise to any fetal or adult cell type. Adult stem cells are multipotent, have the ability to differentiate into a limited number of specialized cell types, and have been obtained from the bone marrow, umbilical cord blood, placenta and adipose tissue. Stem cell therapy is the most promising therapy for several degenerative and devastating diseases including digestive tract disease such as liver failure, inflammatory bowel disease, Celiac sprue, and pancreatitis. Further understanding of biological properties of stem cells will lead to safe and successful stem cell therapies.
Adult Stem Cells/cytology/metabolism/transplantation ; Embryonic Stem Cells/cytology/metabolism/transplantation ; Humans ; Induced Pluripotent Stem Cells/cytology/metabolism/transplantation ; Stem Cells/*cytology/metabolism

Extraordinary advances in stem cell research have initiated an era of hope for strategies to treat intractable human diseases. Personalized regenerative treatment using stem cells is expected to accelerate continuous investment and research efforts throughout the world. Despite of their constraints, adult stem cells and embryonic stem cells have been used for cell transplantation for several intractable diseases. Besides adult and embryonic stem cells, the recent studies of induced pluripotent stem cells widened the possibility of patient-specific cell therapy, drug discovery, and disease modeling. This review focuses on the developments and potential applications of the stem cells for the treatment of peripheral neuropathy.
Adult ; Adult Stem Cells ; Cell Transplantation ; Drug Discovery ; Embryonic Stem Cells ; Humans ; Induced Pluripotent Stem Cells ; Investments ; Median Neuropathy ; Neural Stem Cells ; Peripheral Nervous System Diseases ; Stem Cell Research ; Stem Cells ; Tissue Therapy ; Transplants

Acute myocardial infarction and subsequent heart failure are leading causes of death worldwide. Stem cell-based therapies have improved cardiac function in recent clinical trials, but cardiomyocyte regeneration has not been demonstrated in human hearts. Angiogenesis and restoration of cardiac perfusion have been successfully performed using bone marrow derived stem cells and other adult stem cells. Resident cardiac stem cells are known to differentiate into multiple heart cell types, including cardiomyocytes. Furthermore, induced pluripotent stem cells are a focus of research due to the great potential for customized stem cell therapy.
Adult Stem Cells ; Bone Marrow ; Cause of Death ; Cell Differentiation ; Heart ; Heart Failure ; Humans ; Induced Pluripotent Stem Cells ; Myocardial Infarction ; Myocytes, Cardiac ; Perfusion ; Regeneration ; Stem Cells

Neurodegenerative diseases are the hereditary and sporadic conditions which are characterized by progressive neuronal degeneration. Neurodegenerative diseases are emerging as the leading cause of death, disabilities, and a socioeconomic burden due to an increase in life expectancy. There are many neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, Huntington's disease, and multiple sclerosis, but we have no effective treatments or cures to halt the progression of any of these diseases. Stem cell-based therapy has become the alternative option to treat neurodegenerative diseases. There are several types of stem cells utilized; embryonic stem cells, induced pluripotent stem cells, and adult stem cell (mesenchymal stem cells and neural progenitor cells). In this review, we summarize recent advances in the treatments and the limitations of various stem cell technologies. Especially, we focus on clinical trials of stem cell therapies for major neurodegenerative diseases.
Adult Stem Cells ; Alzheimer Disease ; Amyotrophic Lateral Sclerosis ; Cause of Death ; Cell Transplantation ; Embryonic Stem Cells ; Huntington Disease ; Induced Pluripotent Stem Cells ; Life Expectancy ; Multiple Sclerosis ; Neurodegenerative Diseases* ; Neurons ; Parkinson Disease ; Stem Cells*