Mesenteric lymph duct ligation prevents shock-induced RBC deformability and shape changes

Area of Science:

• Physiology
• Trauma Research
• Hematology

Background:

• The mechanisms behind red blood cell (RBC) deformability and shape changes following trauma and hemorrhagic shock (T/HS) are not fully understood.
• It is hypothesized that gut injury contributes to RBC damage, mediated by factors transported via intestinal lymph.

Purpose of the Study:

• To investigate the role of gut-derived factors in T/HS-induced RBC injury.
• To determine if interrupting intestinal lymph flow prevents RBC damage after T/HS.

Main Methods:

• RBC deformability was assessed using a laser-assisted ektacytometer, measuring the elongation index.
• RBC shape was examined via scanning electron microscopy.
• Experiments were conducted on rats subjected to T/HS, with and without mesenteric lymph duct ligation.

Main Results:

• In rats undergoing T/HS without lymph duct ligation, the RBC elongation index significantly decreased post-shock, indicating reduced deformability.
• Rats with ligated lymph ducts showed no significant decrease in RBC deformability after T/HS.
• Electron microscopy revealed a higher percentage of abnormally shaped RBCs in T/HS rats compared to those with ligated lymph ducts.

Conclusions:

• Ligating the mesenteric lymph duct effectively prevented T/HS-induced damage to RBCs.
• This suggests that gut-derived factors transported through intestinal lymph play a critical role in T/HS-related RBC injury.
• Preserving RBC deformability may be crucial in mitigating T/HS-induced microcirculatory dysfunction and organ damage.