Meconium aspiration syndrome induces complement-associated systemic inflammatory response in newborn piglets

Area of Science:

• Neonatal Medicine
• Immunology
• Respiratory Physiology

Background:

• Meconium aspiration syndrome (MAS) pathophysiology is complex.
• Previous research indicated meconium potently activates complement.
• The current study investigates the systemic inflammatory response linked to complement activation in experimental MAS.

Purpose of the Study:

• To determine if complement activation in experimental MAS is associated with systemic inflammation.
• To assess granulocyte activation, and cytokine and chemokine release in response to meconium aspiration.
• To correlate complement activation markers with physiological parameters and inflammatory markers.

Main Methods:

• MAS was induced in newborn piglets by meconium instillation.
• Control piglets received saline.
• Hemodynamic and lung dynamic data were collected.
• Plasma terminal complement complex (TCC), IL-6, and IL-8 were measured.
• Granulocyte CD18, CD11b expression, and oxidative burst were analyzed via flow cytometry.

Main Results:

• Plasma TCC levels significantly increased in MAS piglets compared to controls.
• TCC concentrations correlated with oxygenation and ventilation indices and inversely with lung compliance.
• IL-6 and IL-8 levels were elevated in MAS piglets.
• Granulocyte oxidative burst decreased significantly in MAS piglets.
• TCC correlated with IL-6, IL-8, and inversely with oxidative burst.

Conclusions:

• Experimental MAS is associated with a systemic inflammatory response.
• Complement activation plays a significant role in this inflammatory response.
• This inflammatory reaction may contribute to the pathogenesis of MAS.