A research team led by scientists from The Jackson Laboratory said they have gained a better understanding of the inner workings of the still-emerging concept of lung regeneration. Reporting on the role of certain lung stem cells in regenerating lungs damaged by disease, the scientists added that their study (“p63+Krt5+ distal airway stem cells are essential for lung regeneration”), published in Nature, points to potential therapeutic strategies that harness these lung stem cells.
“The idea that the lung can regenerate has been slow to take hold in the biomedical research community,” said Frank McKeon, Ph.D., from The Jackson Laboratory, “in part because of the steady decline that is seen in patients with severe lung diseases like chronic obstructive pulmonary disease (known as COPD) and pulmonary fibrosis.”
Nevertheless, he noted, there are examples in humans that point to the existence of a robust system for lung regeneration. “Some survivors of acute respiratory distress syndrome, or ARDS, for example, are able to recover near-normal lung function following significant destruction of lung tissue,” he pointed out.
Mice appear to share this capacity. Mice infected with the H1N1 influenza virus show progressive inflammation in the lung followed by outright loss of important lung cell types. Yet over several weeks, the lungs recover, revealing no signs of the previous lung injury.
Using this mouse model system, Dr. McKeon and his colleagues had previously identified a type of adult lung stem cell known as p63+/Krt5+ in the distal airways. When grown in culture, these lung stem cells formed alveolar-like structures, similar to the alveoli found within the lung. Following infection with H1N1, these same cells migrated to sites of inflammation in the lung and assembled into pod-like structures that resemble alveoli, both visually and molecularly.
In the new paper, the research team reports that the p63+/Krt5+ lung stem cells proliferate upon damage to the lung caused by H1N1 infection. Following such damage, the cells go on to contribute to developing alveoli near sites of lung inflammation.
“We show that pre-existing, intrinsically committed DASCp63/Krt5 [distal airway stem cells expressing Trp63 (p63) and keratin 5, undergo a proliferative expansion in response to influenza-induced lung damage, and assemble into nascent alveoli at sites of interstitial lung inflammation,” wrote the investigators.
To test whether these cells are required for lung regeneration, the researchers developed a novel system that leverages genetic tools to selectively remove these cells from the mouse lung. Mice lacking the p63+/Krt5+ lung stem cells cannot recover normally from H1N1 infection, and exhibit scarring of the lung and impaired oxygen exchange, demonstrating their key role in regenerating lung tissue.
The scientists also showed that when individual lung stem cells are isolated and subsequently transplanted into a damaged lung, they readily contribute to the formation of new alveoli, underscoring their capacity for regeneration.
In the U.S. about 200,000 people have ARDS, a disease with a death rate of 40%, and there are 12 million patients with COPD. The researchers said they hope that their research could lead to new ways to help them.