High Levels of Soluble Triggering Receptor Expressed on Myeloid Cells–Like Transcript (TLT)-1 Are Associated With Acute Respiratory Distress Syndrome

Author:

Morales-Ortíz Jessica1,Rondina Matthew T.234,Brown Samuel M.56,Grissom Colin56,Washington A. Valance1

Affiliation:

1. Department of Biology, University of Puerto Rico-Rio Piedras, San Juan, Puerto Rico

2. Laboratory of Anatomy and Cell Biology, Molecular Medicine Program and Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT, USA

3. Department of Medicine and the Molecular Medicine Program, the University of Utah Health Sciences Center, Salt Lake City, UT, USA

4. George E. Wahlen VAMC GRECC, Salt Lake City, UT, USA

5. Pulmonary and Critical Care Medicine, Intermountain Medical Center, Murray, UT, USA

6. Pulmonary and Critical Care Medicine, University of Utah, Salt Lake City, UT, USA

Abstract

We have previously demonstrated that elevated levels of soluble triggering receptor expressed on myeloid cells–like transcript 1 (sTLT-1) modulate sepsis-induced inflammation and positively correlate with disseminated intravascular coagulation (DIC). Here, we evaluate the clinical implications of plasma sTLT-1 in acute respiratory distress syndrome (ARDS), which is common in sepsis patients. Soluble TLT-1 levels in the plasma of ARDS patients (n = 20) were determined by slot blot analysis and were compared with clinical parameters to identify significant associations. For comparisons to ARDS, we also measured sTLT-1 levels in matched healthy controls (n = 20). Of the 20 plasma samples evaluated from patients with ARDS, 60% were diagnosed with sepsis and 40% were diagnosed with septic shock. The white blood cells (WBCs) of patients with ARDS were found to be significantly elevated over healthy controls with a mean of 13 k/µL over 6.2 k/µL, respectively. The mean plasma levels of sTLT-1 were 148.4 pg/mL ± 16.52 in the patient cohort and 92.45 pg/mL ± 17.12 in the control group ( P = .02). No statistically significant correlations were found between plasma levels of sTLT-1 and WBCs, sepsis, septic shock or acute physiologic, and chronic health evaluation II scores. A statistically significant inverse correlation (r2 = .25, P < .05) was found between plasma sTLT-1 and peripheral platelet counts in patients with ARDS. Increased levels of sTLT-1 in ARDS patients suggest that TLT-1 may mediate the pathobiology of ARDS. Moreover, our data are the first to demonstrate a specific platelet marker in the development of ARDS due to sepsis.

Funder

National Institute of General Medical Sciences

Publisher

SAGE Publications

Subject

Hematology,General Medicine

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