Researchers at National Jewish Health have discovered a signaling pathway that is crucial to the devastating effects of acute lung injury (ALI). The data, obtained from cells, animals and ALI patients, suggest several potential therapeutic targets. Experimental blockade of one of the targets significantly reduced flooding of the lungs that is the hallmark of ALI.
"Acute lung injury is a devastating disease, with 40 percent mortality and no beneficial therapies," said first author James Finigan, MD, Assistant Professor of Medicine at National Jewish Health. "Our study identifies several promising targets for therapy, including HER2, which is already targeted by existing breast-cancer medications."
About 200,000 people in the United States suffer acute lung injury (ALI) every year. It is caused by either direct injury to the lungs or as a result of other conditions, often pneumonia or systemic infection. In ALI, large amounts of protein-rich fluid flow from the capillaries into the lungs, leading to flooding of the airspaces and reduced ability to deliver oxygen to the blood. Severe ALI is often referred to as acute respiratory distress syndrome or ARDS. Currently there is no approved therapy for the disease. Care of ALI patients is supportive only, in which doctors try to maintain blood-oxygen levels. Approximately 40 percent of patients with ALI, or 90,000 people per year in the US, die.
Dr. Finigan and his colleagues had previously shown that HER2, a receptor involved in cell development and growth, participates in recovery of mice from chemically-induced lung injury. They hypothesized that it may also play a role in the earlier inflammatory phase of lung injury, which resembles ALI in mice. The researchers also knew that the inflammatory molecule interleukin-1â is a central player in ALI and the permeability of capillaries.
In a series of experiments in cell culture and animal models they connected interleukin-1â to HER2, which triggers a cascade of signals within epithelial cells. Those signals cause blood vessel walls to become permeable and allow the flood of fluid into the lung airspaces. When researchers blocked production of NRG-1, one of the molecules in the signaling pathway, they reduced flow of molecules through a cellular barrier by 52 percent.
The researches then examined lung fluid from ALI patients, and found heightened levels of NRG-1, adding clinical evidence to their data supporting an important role for this pathway. They published their findings January 19 in the online version of the Journal of Biological Chemistry
Two existing medications, herceptin and tykerb, already target a malfunctioning HER2 in some cases of breast-cancer. Several medications targeting ADAM17 are also in development.
"Our work suggests several very promising avenues of research that may finally bring help to ALI patients," said senior author Jeffrey Kern, MD, Professor of Medicine at National Jewish Health.
William Allstetter | EurekAlert!
New risk factors for anxiety disorders
24.02.2017 | Julius-Maximilians-Universität Würzburg
Stingless bees have their nests protected by soldiers
24.02.2017 | Johannes Gutenberg-Universität Mainz
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
24.02.2017 | Life Sciences
24.02.2017 | Life Sciences
24.02.2017 | Trade Fair News