Scientists at the University of Pittsburgh School of Medicine have discovered a new biological pathway of innate immunity that ramps up inflammation and then identified agents that can block it, leading to increased survival and improved lung function in animal models of pneumonia. They reported their findings today in Nature Immunology.
Pneumonia and other infections sometimes provoke an inflammatory response from the body that is more detrimental than the disease-causing bacteria, said senior author Rama Mallampalli, M.D, professor and vice chair for research, Department of Medicine, and director of the Acute Lung Injury Center of Excellence at Pitt.
"In our ongoing studies of pneumonia, we found infecting bacteria activate a previously unknown protein called Fbxo3 to form a complex that degrades another protein called Fbxl2, which is needed to suppress the inflammatory response," said Dr. Mallampalli, who is also chief of the pulmonary division of the VA Pittsburgh Healthcare System. "The result is an exaggerated inflammatory response that can lead to further damage of the lung tissue, multi-organ failure and shock."
The research team, led by Bill B. Chen, Ph.D., associate professor, Division of Pulmonary, Allergy and Critical Care Medicine, conducted experiments in which mice that lacked the ability to make Fbxo3 were infected with a strain of Pseudomonas bacteria, and found that they had better lung mechanics and longer survival than mice that still made the protein.
Research team members Bryan J. McVerry, M.D., and Yingze Zhang, Ph.D., both of the Acute Lung Injury Center of Excellence, found that blood samples from 16 people who had sepsis, a condition of systemic inflammation, revealed higher levels of Fbxo3 and other inflammatory proteins and lower levels of Fbxl2 than samples from seven patients who did not have sepsis or lung infection.
Based on the structure of Fbxo3, the researchers developed a family of small molecules with the aim of inhibiting its activity. Administration of one of them, called BC-1215, led to reduced inflammatory markers and improved lung mechanics in mouse models of pneumonia and sepsis.
"The key is to find ways to help the body temper its inflammatory response so that it's able to kill the infectious agent without causing injury to healthy tissue," Dr. Mallampalli said.
"The F-box protein Fbxo3, and other related proteins, represent ideal targets for treatment of acute lung injury, because it controls the innate immune response, is upstream of important inflammatory signaling pathways, and is more selective than traditional drugs that regulate protein turnover," noted Mark T. Gladwin, M.D., chief of the Division of Pulmonary, Allergy and Critical Care Medicine, Pitt School of Medicine.
The team is beginning to study the effects of BC-125 on other conditions of systemic inflammation, such as colitis and arthritis.
Co-authors of the paper include Tiffany A. Coon, Jennifer R. Glasser, Jing Zhao, Ph.D., Yutong Zhao, M.D, Ph.D., Chunbin Zou, Ph.D, Bryon Ellis, and Frank C. Sciurba, M.D., all of the Acute Lung Injury Center of Excellence, University of Pittsburgh.
The study was funded by the U.S. Department of Veterans Affairs; National Institutes of Health grants HL096376, HL097376, HL098174, HL116472, HL01916, and P50HL084948; and the American Heart Association.
About the University of Pittsburgh School of Medicine
As one of the nation's leading academic centers for biomedical research, the University of Pittsburgh School of Medicine integrates advanced technology with basic science across a broad range of disciplines in a continuous quest to harness the power of new knowledge and improve the human condition. Driven mainly by the School of Medicine and its affiliates, Pitt has ranked among the top 10 recipients of funding from the National Institutes of Health since 1998. In rankings recently released by the National Science Foundation, Pitt ranked fifth among all American universities in total federal science and engineering research and development support.
Likewise, the School of Medicine is equally committed to advancing the quality and strength of its medical and graduate education programs, for which it is recognized as an innovative leader, and to training highly skilled, compassionate clinicians and creative scientists well-equipped to engage in world-class research. The School of Medicine is the academic partner of UPMC, which has collaborated with the University to raise the standard of medical excellence in Pittsburgh and to position health care as a driving force behind the region's economy. For more information about the School of Medicine, see http://www.medschool.pitt.edu.
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