Scientists have for the first time transformed human stem cells into functional lung and airway cells.
The advance, by Columbia University Medical Center (CUMC) researchers, has significant potential for modelling lung disease, screening drugs, studying human lung development, and, ultimately, generating lung tissue for transplantation.
"Researchers have had relative success in turning human stem cells into heart cells, pancreatic beta cells, intestinal cells, liver cells, and nerve cells, raising all sorts of possibilities for regenerative medicine," said study leader.
"Now, we are finally able to make lung and airway cells. This is important because lung transplants have a particularly poor prognosis," said Snoeck, professor of medicine (in microbiology & immunology) and affiliated with the Columbia Center for Translational Immunology and the Columbia Stem Cell
"Although any clinical application is still many years away, we can begin thinking about making autologous lung transplants - that is, transplants that use a patient's own skin cells to generate functional lung tissue," Snoeck said.
The research builds on Snoeck's 2011 discovery of a set of chemical factors that can turn human embryonic stem (ES) cells or human induced pluripotent stem (iPS) cells into anterior foregut endoderm - precursors of lung and airway cells.
In the current study, Snoeck and his colleagues found new factors that can complete the transformation of human ES or PS cells into functional lung epithelial cells (cells that cover the lung surface).
The resultant cells were found to express markers of at least six types of lung and airway epithelial cells, particularly markers of type 2 alveolar epithelial cells.
Type 2 cells are important because they produce surfactant, a substance critical to maintain the lung alveoli, where gas exchange takes place; they also participate in
repair of the lung after injury and damage.
The findings have implications for the study of a number of lung diseases, including idiopathic pulmonary fibrosis (IPF), in which type 2 alveolar epithelial cells are thought to play a central role.
"No one knows what causes the disease, and there's no way to treat it," said Snoeck.
"Using this technology, researchers will finally be able to create laboratory models of IPF, study the disease at the molecular level, and screen drugs for possible treatments or cures," Snoeck said.
The study was published in the journal Nature Biotechnology.