ABSTRACT
Recently,the promising features of lung stem cells,including ability to differentiate into di-verse cell lineages and their regenerative properties,have aroused researchers′ attention,which offers intriguing perspectives on cell-based therapies for end stage lung disease. Associated with various stem cell phenotypes, lung stem cell has been proved to differentiate into cell lineages, such as endothelial, epithelial cell and secret cells,which reconstitute the injured lung then lead to lung regeneration. In the present paper,a comprehensive re-view of stem cell-based clinical trials conducted worldwide that scrutinizes biological properties of lung stem cells and highlights lung stem cell therapeutic effects is elaborated. To date,there is no regulatory approved cell treatment for end stage lung disease,but research and clinical studies offer the hope for successful cell therapy in the next decades.
ABSTRACT
Recently,the promising features of lung stem cells,including ability to differentiate into di-verse cell lineages and their regenerative properties,have aroused researchers′ attention,which offers intriguing perspectives on cell-based therapies for end stage lung disease. Associated with various stem cell phenotypes, lung stem cell has been proved to differentiate into cell lineages, such as endothelial, epithelial cell and secret cells,which reconstitute the injured lung then lead to lung regeneration. In the present paper,a comprehensive re-view of stem cell-based clinical trials conducted worldwide that scrutinizes biological properties of lung stem cells and highlights lung stem cell therapeutic effects is elaborated. To date,there is no regulatory approved cell treatment for end stage lung disease,but research and clinical studies offer the hope for successful cell therapy in the next decades.
ABSTRACT
Objective To study the impact of aging on the capability of lung stem cell steady-state maintaining and bronchial epithelial cells regeneration and differentiation during the repair of lung epithelial cells after naphthalene induced bronchial epithelialium injury.Methods The proportion of lung stem cells in mice after naphthalene treatment was analyzed by immunohistochemistry and FACS.The repair efficiency of lung epithelial cell in young and old mice was examined by immunohistochemistry staining and FACS.Results The data suggested that aging didn ’ t change the proportion of lung stem cells ( including the distal lung epithelial stem cells/progenitor cells and lung mesenchymal stem cells/progenitor cells) under normal physiological conditions.After naphthalene injury, more serious injury and decreased repairing capacity was observed in old group.Lung progenitor cells /total lung cells decreased during the repair process of lung bronchial epithelialium ( clara cell) injury.The ratio of regenerated cell to lung progenitor and stem cells were also significantly decreased in old group.Conclusion The regenerated capability of lung stem cells after lung bronchial epithelialium injury decreased with aging.This might be the reason of more incidence of lung injury and worse therapeutic results in the elder in clinic.
ABSTRACT
There is a great progress in research related to the lung stem cell which is one kind of somatic stem cells in recent years.This article reviewed systematically the lung stem cell biological characteristics,the surface markers,migration,homing,and the clinical application in the treatment of acute respiratory distress syndrome.