Journal
AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE
Volume 189, Issue 7, Pages 779-786Publisher
AMER THORACIC SOC
DOI: 10.1164/rccm.201311-2033OC
Keywords
transforming growth factor beta-induced protein; sepsis; endothelial dysfunction; permeability; cecal ligation and puncture
Categories
Funding
- National Research Foundation of Korea
- Korean government MEST [2010-0029206, 20120007645]
- MSIP (National Research Foundation of Korea) [2012R1A4A1028835]
- Korean Health Technology R&D Project, Ministry of Health & Welfare, Republic of Korea [A111305]
- Converging Research Center Program through the Ministry of Education, Science and Technology [2010K001054]
- Korea Health Promotion Institute [A111305] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-50304, 2012R1A4A1028835, 2010-0022296, 2010-0029206] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Rationale: Sepsis is a systemic inflammatory condition resulting from bacterial infections; it has a high mortality rate and limited therapeutic options. Despite extensive research into the mechanisms driving bacterial sepsis, the target molecules controlling vascular leakage are still largely unknown. Transforming growth factor beta-induced protein (TGFBIp) is an extracellular matrix protein expressed in several cell types, which is known to interact with integrins. Objectives: The aim of this study was to determine the roles of TGFBIp in vascular proinflammatory responses, and the mechanisms of action driving these responses. Methods: Circulating levels of TGFBIp were measured in patients admitted to the hospital with sepsis, severe sepsis, and septic shock and in cecal ligation and puncture (CLP)-induced septic mice. Effects of TGFBIp knockout on CLP-induced septic mortality and effects of TGFBIp on multiple vascular proinflammatory responses were determined. Measurements and Main Results: Circulating levels of TGFBIp were significantly elevated compared with healthy controls, and were strongly correlated with disease severity. High blood TGFBIp levels were also observed in CLP-induced septic mice. The absence of the TGFBIp gene in mice attenuated CLP-induced sepsis. TGFBIp enhanced vascular proinflammatory responses including vascular permeability, adhesion and migration of leukocytes, and disruption of adherence junctions through interacting with integrin alpha v beta 5. Conclusions: Collectively, our findings demonstrate that the TGFBIp-alpha v beta 5 axis can elicit severe inflammatory responses, suggesting it to be a potential target for development of diagnostics and therapeutics for sepsis.
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