International Team Identifies Potential Therapeutic Target for Sepsis

It’s well documented that Sepsis presents a major problem for healthcare systems. It is also clear, after many years trying to solve this riddle, that the problem must be attacked from many angles to get lasting results. To this end GE Healthcare and Roche are working to develop digital tools that provide clinically relevant insights extracted from the integration and analysis of in-vivo and in-vitro data, delivered at the point of care. As we develop these tools, we also follow with great interest the efforts of clinicians and scientists worldwide in advancing the knowledge and uncovering the underlying factors of sepsis.

International team identifies potential therapeutic target for sepsis

Illustration of sepsis: The presence of numerous bacteria in the blood causes the body to respond in organ dysfunction. Credit: UT Southwestern Medical Center

An international collaboration led by scientists at UT Southwestern Medical Center has identified a potential new therapeutic target for sepsis, a life-threatening disease that can quickly spread through the body damaging organs.

UT Southwestern researchers and collaborators in China, France, and Sweden, as well as New York and Pennsylvania in the U.S., made a key discovery regarding cellular processes that block pathways in immune cells that lead to sepsis. At a fundamental level, sepsis is an out-of-control inflammatory response that damages organs and critical cellular functions leading to tissue damage.

"If not recognized early and managed promptly, sepsis can lead to septic shock, multiple organ failure, and even death," said study author Dr. Rui Kang, Associate Professor of Surgery at UT Southwestern who studies sepsis. "Our study provides novel insight into immune regulation related to sepsis and represents a proof of concept that immunometabolism constitutes a potential therapeutic target in sepsis."

Immunometabolism is the interaction of the body's natural or innate immune response—how cells detect and react to threats—and metabolism—how cells convert food to energy and building blocks the body needs to function. Immunometabolism is an emerging field of study combining the two traditionally independent disciplines.

Sepsis occurs when an initial infection spreads through the bloodstream to other parts of the body. Early detection and treatment of sepsis is critical, but it can be difficult to detect and to stop before damage to organs and tissue occurs. Treatments can involve antibiotics, fluids, oxygen, dialysis to ensure blood flow to affected organs, and surgery to remove damaged tissue.

"The challenges in diagnosing and treating sepsis are why it is so important to find new therapeutic targets that could potentially shut down the inflammatory response," Dr. Kang noted.

In this study in mice, researchers targeted Lipopolysaccharide (LPS), a molecule that is part of the outer membrane of gram-negative bacteria, one of the leading pathogens responsible for sepsis and septic shock. Researchers uncovered a pathway involving LPS that could suppress the sepsis response once activated, providing a potentially valuable therapeutic target. The study demonstrates that a neurotransmitter (L-adrenaline) can act on a receptor (ADRA2B) to suppress activation of the pathway (Cytosolic LPS-caspase-11) and the subsequent lethal inflammation.

Other UT Southwestern authors are Dr. Herbert Zeh, Chairman of Surgery who holds the Hall and Mary Lucile Shannon Distinguished Chair in Surgery, and Dr. Daolin Tang, Associate Professor of Surgery.

The research appears in Science Advances.

More information: Ruochan Chen et al. cAMP metabolism controls caspase-11 inflammasome activation and pyroptosis in sepsis, Science Advances (2019). DOI: 10.1126/sciadv.aav5562 Provided by UT Southwestern Medical Center

Citation: International team identifies potential therapeutic target for sepsis (2019, May 31) retrieved 31 May 2019 from

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