Red-blood-cell manufacturing methods and storage solutions differentially induce pulmonary cell activation

Area of Science:

• Transfusion Medicine
• Pulmonary Medicine
• Cellular Biology

Background:

• Red blood cell (RBC) transfusion is linked to lung injury, potentially worsened by mechanical ventilation.
• Global variations in blood product manufacturing may affect immunomodulatory properties and induce pulmonary cell activation.

Purpose of the Study:

• To investigate how different RBC manufacturing methods influence pulmonary cell activation in an in vitro mechanical ventilation model.

Main Methods:

• Pulmonary type II cells were exposed to supernatants from RBCs processed via whole blood filtration (WBF), red cell filtration (RCF), apheresis-derived (AD), or whole blood-derived (WBD) methods.
• Lung cells were subjected to mechanical stretching (25% stretch for 24 hours) to simulate ventilation effects.

Main Results:

• Fresh AD and WBF products, but not old ones, WBD, or RCF products, induced pro-inflammatory cytokine and chemokine production.
• These effects correlated with increased platelet-derived vesicles and thrombin generation.
• Mechanical stretching exacerbated cell injury, an effect amplified by AD products; RCF products showed the least injury.

Conclusions:

• RBC manufacturing methods significantly impact pulmonary cell activation, potentially via product-generated vesicles.
• The chosen RBC manufacturing method is a critical factor in understanding transfusion-associated lung injury.