A membrane TNF-alpha/TNFR ratio correlates to MODS score and mortality

Area of Science:

• Immunology
• Critical Care Medicine
• Pathophysiology

Background:

• Conflicting reports exist on serum tumor necrosis factor-alpha (TNF-alpha) levels and trauma patient outcomes.
• Previous studies lacked objective illness severity scores, serial measurements, and analysis of membrane-associated vs. secreted TNF-alpha and soluble TNF receptors.

Purpose of the Study:

• To investigate the relationship between monocyte TNF-alpha production (membrane-associated and secreted) and TNF receptor shedding with the development of multiple organ dysfunction syndrome (MODS) in trauma patients.
• To address limitations in previous studies by using a quantitative MODS score and analyzing both membrane and secreted TNF-alpha and receptor shedding.

Main Methods:

• Quantified illness severity using the MODS score throughout ICU stay.
• Assessed monocyte production of secreted TNF-alpha (sTNF) and membrane-associated TNF-alpha (mTNF), and shed p75 TNF-alpha receptor (TNFR) levels in stimulated and unstimulated monocytes from patients and controls.
• Correlated these monocyte parameters with the MODS score.

Main Results:

• No correlation was found between sTNF and MODS score.
• Increased mTNF and decreased TNFR shedding showed a non-specific correlation with increased MODS.
• An elevated mTNF/TNFR ratio in stimulated monocytes demonstrated high specificity for predicting organ failure (p = .0002).

Conclusions:

• Dual deregulation in monocyte TNF-alpha production, characterized by increased mTNF and decreased TNFR shedding, strongly correlates with MODS development.
• This dual deregulation serves as a specific indicator for predicting organ failure in trauma patients.