Methysergide attenuates systemic burn edema in rats.

Area of Science:

• Biomedical research
• Trauma and injury research
• Pharmacology

Background:

• Severe thermal injuries (>20% TBSA) induce systemic shock and edema.
• Burn shock is mediated by cytokines.
• Methysergide (Met), a serotonin receptor antagonist, reduces edema in endotoxemia.

Purpose of the Study:

• To evaluate the systemic effects of methysergide (Met) after thermal injury.
• To determine Met's impact on burn shock-induced edema and leukocyte activation.

Main Methods:

• Rats underwent thermal injury (30% TBSA) or sham burn.
• Plasma from burned rats was transferred to healthy recipients.
• Recipients received burn plasma, sham burn plasma, or burn plasma plus Met.
• Microscopy assessed capillary leakage, edema (FITC-albumin), and leukocyte adherence.

Main Results:

• Burn plasma transfer caused significant systemic capillary leakage and edema.
• Methysergide administration reduced edema and FITC-albumin extravasation to baseline levels.
• Leukocyte adherence increased in all groups, with no significant difference in Met-treated groups.

Conclusions:

• Burn plasma transfer induces leukocyte activation and plasma extravasation in healthy individuals.
• Methysergide administration mitigates these effects, suggesting a role in managing burn shock.
• Further research with specific antagonists is needed to differentiate systemic and local Met effects.