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How to Make a Lung: Cell-Regeneration Molecules Essential Signals for Early Lung Development, Penn Study Finds
August 18, 2009PHILADELPHIA - A tissue-repair-and-regeneration pathway in the human body, including wound healing, is essential for the early lung to develop properly. Genetically engineered mice fail to develop lungs when two molecules in this pathway, Wnt2 and Wnt2b, are knocked out. The findings are described this week in Developmental Cell.
"We wanted to know the answer to a seemingly simple question: What is required to generate the lung in mammals?" asked senior author Edward Morrisey, PhD, Associate Professor of Medicine and Cell and Developmental Biology at the University of Pennsylvania School of Medicine.
"Wnt molecules are important for lung growth and we think that some of the molecules in the Wnt pathway are needed to specify lung progenitor cells and if not enough cells are 'told' to make a lung, an animal develops a faulty, smaller organ or even no lung," says Morrisey, who is also the Scientific Director of the Penn Institute for Regenerative Medicine.
Several molecular signals are important for proper lung development but not much is known about the early signals that turn on the genes needed to specify the lung at the right place and time in the embryo. Clinically, understanding how a lung develops is important in treating or preventing a host of lung and pulmonary diseases in children. "Premature babies in particular often develop respiratory problems which can lead to health issues not only during infancy but also later in life" says Morrisey.
He also points out that pulmonary and cardiac development is intricately connected: "One thing that is coming out of these studies is that the lung and heart form together which is an important point to remember as pathways affecting one organ system can affect the other." In fact, one of the Wnt knockout mice the team developed also has profound cardiovascular defects, he notes.
In the developing embryo, the lung, pancreas, liver, thyroid, and stomach all come from the foregut region, which starts out looking like a long tube. "These organs bud from this undifferentiated tube and go on to develop into specific tissue types," explains Morrisey. "The lung is one of the last to bud off the foregut during development."
The team focused on the Wnt pathway to see where and when Wnt molecules were expressed along the foregut tube, even before the lung starts to become a recognizable organ. "The lung is a relative late arriver," says Morrisey. "The liver, pancreas, and other organs begin developing days earlier." They found that the Wnt proteins Wnt2 and Wnt2b are expressed in the cells surrounding the foregut, right where the lung will eventually form. When they are knocked out, the animals completely lacked lungs.
Morrisey surmised that Wnt2 and Wnt2b were required to specify the early progenitors for the lung in the foregut. "We found that the Nkx2.1 gene, which is expressed in both lung and thyroid progenitor cells in the foregut, were absent only in the region where the lung was supposed to form and not in the thyroid progenitor cells."
They confirmed this fine tuning of lung development by knocking out an additional gene in the Wnt pathway called beta-catenin in the early foregut, and these mice also did not develop lungs, but all the other foregut-associated organs developed properly. "This says that these two Wnt molecules are essential for specifying the lung but not other foregut-derived organs" explains Morrisey.
The Morrisey lab also showed that activation of the Wnt pathway resulted in formation of lung progenitors in both the esophagus and stomach where they are normally excluded. "The ability of Wnt to program esophagus and stomach endoderm to a lung fate points to the critical role this pathway plays in lung development and suggests the possible use of Wnt in generating lung epithelium from non-lung sources."
First author Ashley Goss is a graduate student in the Morrisey lab and co-author Terry P. Yamaguchi, National Cancer Institute, made one of the knockout mice. This work was funded by the National Heart, Lung, and Blood Institute, the American Heart Association and the National Cancer Institute.
Penn Medicine
Several molecular signals are important for proper lung development but not much is known about the early signals that turn on the genes needed to specify the lung at the right place and time in the embryo. Clinically, understanding how a lung develops is important in treating or preventing a host of lung and pulmonary diseases in children. "Premature babies in particular often develop respiratory problems which can lead to health issues not only during infancy but also later in life" says Morrisey.
He also points out that pulmonary and cardiac development is intricately connected: "One thing that is coming out of these studies is that the lung and heart form together which is an important point to remember as pathways affecting one organ system can affect the other." In fact, one of the Wnt knockout mice the team developed also has profound cardiovascular defects, he notes.
In the developing embryo, the lung, pancreas, liver, thyroid, and stomach all come from the foregut region, which starts out looking like a long tube. "These organs bud from this undifferentiated tube and go on to develop into specific tissue types," explains Morrisey. "The lung is one of the last to bud off the foregut during development."
The team focused on the Wnt pathway to see where and when Wnt molecules were expressed along the foregut tube, even before the lung starts to become a recognizable organ. "The lung is a relative late arriver," says Morrisey. "The liver, pancreas, and other organs begin developing days earlier." They found that the Wnt proteins Wnt2 and Wnt2b are expressed in the cells surrounding the foregut, right where the lung will eventually form. When they are knocked out, the animals completely lacked lungs.
Morrisey surmised that Wnt2 and Wnt2b were required to specify the early progenitors for the lung in the foregut. "We found that the Nkx2.1 gene, which is expressed in both lung and thyroid progenitor cells in the foregut, were absent only in the region where the lung was supposed to form and not in the thyroid progenitor cells."
They confirmed this fine tuning of lung development by knocking out an additional gene in the Wnt pathway called beta-catenin in the early foregut, and these mice also did not develop lungs, but all the other foregut-associated organs developed properly. "This says that these two Wnt molecules are essential for specifying the lung but not other foregut-derived organs" explains Morrisey.
The Morrisey lab also showed that activation of the Wnt pathway resulted in formation of lung progenitors in both the esophagus and stomach where they are normally excluded. "The ability of Wnt to program esophagus and stomach endoderm to a lung fate points to the critical role this pathway plays in lung development and suggests the possible use of Wnt in generating lung epithelium from non-lung sources."
First author Ashley Goss is a graduate student in the Morrisey lab and co-author Terry P. Yamaguchi, National Cancer Institute, made one of the knockout mice. This work was funded by the National Heart, Lung, and Blood Institute, the American Heart Association and the National Cancer Institute.
Penn Medicine
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Changes in gene may stunt lung development in children
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Gene variants may determine lung function and susceptibility to maternal smoking
A tiny variation within a single gene can determine not only how quickly and well lungs grow and function in children and adolescents, but how susceptible those children will be to exposure to second-hand tobacco smoke, even in utero, according to researchers from the University of Southern California.
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Smoking during pregnancy a 'double-edged sword' in SIDS
Premature infants whose mothers smoked during pregnancy may be at even higher risk for sudden infant death syndrome (SIDS) than preemies whose mothers did not smoke, according to new research out of the University of Calgary.
Research with squirrels provides clues on hormone's role in human learning
Tests on the influence that a stress-related hormone has on learning in ground squirrels could have an impact on understanding how it influences human learning, according to a University of Chicago researcher.
Caffeine use to regulate breathing of very preterm babies, long-term benefits
Very premature babies who were given caffeine to regulate their breathing have a significantly lower incidence of disabilities at the age of two years, according to an international study led by researchers at McMaster University.
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