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Prostacyclin and thromboxane A2 in septic shock: species differences
Circulatory Shock
|January 1, 1986
Summary
This study compared prostacyclin (PGI) and thromboxane B2 (TxB) levels in sepsis across rats, pigs, dogs, and humans. Porcine PGI changes most closely mirrored human responses during septic shock.
Area of Science:
- Biomedical research
- Sepsis pathophysiology
- Prostanoid signaling
Background:
- Prostacyclin (PGI) and thromboxane A2 (TxA2) are implicated in septic shock.
- Understanding human prostanoid responses in sepsis and experimental models is limited.
Purpose of the Study:
- To compare plasma levels of prostaglandin 6-keto-F1 alpha (PGI) and thromboxane B2 (TxB) in septic shock across Sprague-Dawley rats, domestic pigs, mongrel dogs, and humans.
Main Methods:
- Sepsis and septic shock were induced in rats, pigs, and dogs using specific bacterial inoculations or infusions.
- Plasma PGI and TxB levels were measured using radioimmunoassay in control, septic, and septic shock states.
- Human data included normal controls, severe sepsis, and septic shock patients.
Main Results:
- Dogs and pigs exhibited significantly higher baseline TxB levels than rats and humans.
- Dogs showed significantly higher PGI levels than all other species.
- TxB increased in murine sepsis; PGI increased in sepsis and septic shock.
- Porcine sepsis and septic shock showed increased TxB.
- In humans, both PGI and TxB increased in severe sepsis, with PGI remaining elevated in septic shock.
Conclusions:
- TxB/PGI ratio changes were similar across all studied species.
- Prostaglandin changes in porcine sepsis models closely paralleled clinical observations in humans.