Newly Identified Stem Cell can Regenerate Lung Tissue After Acute Injury

by Megha Ramaviswanathan on  March 1, 2018 at 11:37 AM Research News
RSS Email Print This Page Comment bookmark
Font : A-A+

Lung stem cell that has been newly found can repair the organ's gas exchange compartment, according to a new study by scientists at Perelman School of Medicine at the University of Pennsylvania. The progenitor cells that have been isolated and characterized from mouse and human lungs are found to be essential in repairing lung tissue damaged by severe influenza and other respiratory ailments.
Newly Identified Stem Cell can Regenerate Lung Tissue After Acute Injury
Newly Identified Stem Cell can Regenerate Lung Tissue After Acute Injury

The research, led by Edward E. Morrisey, PhD, a professor of Cell and Developmental Biology, is published in the journal Nature. Morrisey is also director of the Penn Center for Pulmonary Biology and scientific director of the Institute for Regenerative Medicine.

The development of the lung, or pulmonary system, is an evolutionary adaption to life on land. Lungs are essential in most large animals for a terrestrial existence. Their complex structure, which is dictated in part by their integration with the cardiovascular system, makes them an interesting yet difficult organ to study from a regeneration medicine perspective. In addition, lung disease is one of the leading causes of death in the world, surpassed only by cardiovascular disease and cancer.

"One of the most important places to better understand lung regeneration is in the alveoli, the tiny niches within the lung where oxygen is taken up by the blood and carbon dioxide is exhaled," Morrisey said. "To better understand these delicate structures, we have been mapping the different types of cells within the alveoli. Understanding cell-cell interactions should help us discover new players and molecular pathways to target for future therapies."

The study examined the epithelial cells that line the surfaces of lung gas-exchange alveoli for stem cell behavior that could restore normal respiratory function after severe injury caused by an influenza infection or in such diseases as chronic obstructive pulmonary disease (COPD). While some organs, such as the intestine, turn over the entire epithelial lining every five days through the activity of a resident stem-cell lineage, organs such as the lung exhibit very slow turnover and contain stem cells that are activated only upon injury to regenerate the damaged tissue.

The team identified an alveolar epithelial progenitor (AEP) lineage which is embedded in a larger population of cells called alveolar type 2 cells, or AT2s. These cells generate pulmonary surfactant (a wetting agent), which keeps the lungs from collapsing upon every breath taken. "AEPs are a stable lineage in the lung and turn over very slowly, but expand rapidly after injury to regenerate the lining of the alveoli and restore gas exchange," said co-first author Will Zacharias, MD, PhD, a postdoctoral fellow in Morrisey's lab. David B. Frank, MD, PhD, a pediatric cardiologist at Children's Hospital of Philadelphia, is the other co-first author.

AEPs exhibit their own distinct suite of genes and contain a unique epigenetic signature. The Morrisey lab used the genomic information gained from mouse AEPs to identify a conserved cell surface protein called TM4SF1 that can be used to isolate AEPs from the human lung. Using this ability to isolate mouse and human AEPs, the team then generated David B. Frank three-dimensional lung organoids. "From our organoid culture system, we were able to show that AEPs are an evolutionarily conserved alveolar progenitor that represents a new target for human lung regeneration strategies," Morrisey said.

The team has access to more than 300 lungs through the lung transplant program headed by Edward Cantu, MD, an associate professor of Surgery. For their next study, the team aims to investigate influenza-damaged lung tissue as well as other lung disease models to determine where and when AEPs increase in response to acute lung injury or more chronic disease states.

Given the severity of the current influenza season, these studies provide new insight into how the human lung regenerates and identifies novel genetic and epigenetic pathways important for lung regeneration. The team is now exploring which of these molecular pathways may promote AEP function in the mouse and human lung, including understanding whether drugs designed to activate Fgf signaling, one of the key pathways conserved in mouse and human AEPs, may promote lung regeneration.

"We are very excited at this novel finding," said James P. Kiley, PhD, director of the Division of Lung Diseases at the National Heart, Lung, and Blood Institute, which supported the study. "Basic studies are fundamental stepping stones to advance our understanding of lung regeneration. Furthermore, the NHLBI support of investigators from basic to translational science helps promote collaborations that bring the field closer to regenerative strategies for both acute and chronic lung diseases."



Source: Eurekalert

Post a Comment

Comments should be on the topic and should not be abusive. The editorial team reserves the right to review and moderate the comments posted on the site.
Notify me when reply is posted
I agree to the terms and conditions

I was diagnosed with pulmonary fibrosis 2015. I was put on high doses of prednisone in 2016. In December 2017 I was hospitalized for 14 days with pneumonia. I was on oxygen 24/7 and the bottom lobes of my lungs are destroyed! I lost hope because my doctor said he have no idea how long I have to live but Glory be to Almighty for leading to Best Health Herbal Centre. I purchased pulmonary fibrosis herbal remedy from Best Health Herbal Centre, the herbal remedy slowed the progression within 5 weeks of usage, 80-85% success rate! This gives me great hope it will reverse my pulmonary fibrosis totally

Advertisement

More News on:

Athletes Foot Stem Cells - Cord Blood Stem Cells - Fundamentals Parkinsons Disease Surgical Treatment Genetics and Stem Cells Pneumoconiosis Silicosis Bone Marrow Transplantation Tissue Engineering and Regenerative Medicine Stem Cells 

News A - Z

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

News Search

Medindia Newsletters

Subscribe to our Free Newsletters!

Terms & Conditions and Privacy Policy.

Find a Doctor

Stay Connected

  • Available on the Android Market
  • Available on the App Store

News Category

News Archive