A 3-D bioengineered model of lung tissue built by University of Michigan researchers is poking holes in decades worth of flat, Petri dish observations into how the deadly disease pulmonary fibrosis progresses.
The causes of pulmonary fibrosis are not fully understood, but the condition is marked by scar tissue that forms inside the lungs. That scar tissue stiffens the walls of the lungs’ air sacs, called alveoli, or, at advanced stages, it can completely fill the alveolar spaces. Both scenarios make breathing difficult and decrease the amount of oxygen entering the bloodstream. Often the condition is irreversible, eventually causing lung failure and death.
Some clinicians are concerned that critically ill COVID-19 patients may develop a form of pulmonary fibrosis after a long stay in the ICU.
Researchers are searching for better treatments. While they’ve managed to find some drugs that relieve symptoms or slow the progression in practice, they can’t always replicate those results in today’s 2-D lab models. So they don’t understand how or why those drugs are working, and they can’t always predict which compounds will make a difference. The new research from U-M takes a step in that direction, and it starkly demonstrates how prior approaches have been ineffective.
The team showed that in some 2-D models, drugs that are already known to be effective in treatment do not produce test results that show efficacy. Their 3-D tissue engineered model of fibrotic lung tissue, however, shows that those drugs work.
Before their tests on drugs, they first performed studies to understand how tissue stiffness drives the appearance of myofibroblasts—cells that correlate with the progression of scarring.
“Even in cells from the same patient, we saw different outcomes,” said Daniel Matera, a Ph.D. candidate and team member. “When we introduced stiffness into the 2-D testing environment, it activated myofibroblasts, essentially creating scar tissue. When we introduced that same kind of stiffness into our 3-D testing environment, it prevented or slowed the activation of myofibroblasts, stopping or slowing the creation of scar tissue.”
With the majority of pulmonary fibrosis research utilizing 2-D testing, he added, many believe the high lung stiffness in patients is what should be targeted by treatments. U-M’s research indicates that targeting stiffness alone may not hinder disease progression in patients, even if it works in a petri dish.
The group’s findings are available in Science Advances.
To find effective treatments, researchers first screen libraries of pharmaceutical compounds. Today, they typically do that on cells cultured on flat plastic or hydrogel surfaces, but these settings often do a poor job of recreating what happens in the human body.
Brendon Baker, an assistant professor in the U-M Department of Biomedical Engineering, and his team took a tissue engineering approach. They reconstructed 3-D lung interstitium, or connective tissue, the home of fibroblasts and location where fibrosis begins. Their goal was to understand how mechanical cues from lung tissue affect fibroblast behavior and disease progression.
“Recreating the 3-D fibrous structure of the lung interstitium allowed us to confirm effective drugs that wouldn’t be identified as hits in traditional screening settings,” Baker said.
At the center of the pulmonary fibrosis mystery is the fibroblast, a cell found in the lung interstitium that is crucial to healing but paradoxically, can also drive disease progression. When activated, after an injury or when disease is present, they become myofibroblasts. Regulated properly, they play an important role in wound healing, but when misregulated, they can drive chronic disease. In the case of pulmonary fibrosis, they cause the stiffening of lung tissue that hampers breathing.
“Our lung tissue model looks and behaves similarly to what we have observed when imaging real lung tissue,” Baker said. “Patient cells within our model can actively stiffen, degrade or remodel their own environment just like they do in disease.”
The paper is titled “Microengineered 3-D pulmonary interstitial mimetics highlight a critical role for matrix degradation in myofibroblast differentiation.”