Abstract
To compare cytokine release and coagulation disturbances induced by administration of high versus low doses of endotoxin (lipopolysaccharide [LPS]), we used two endotoxin test systems similar in mortality but different in the degree of endotoxemia. One group of rats (n = 11) randomly received endotoxin (15.0 mg/kg of body weight intraperitoneally [i.p.]) and 1 ml of Ringer's solution (nonsensitized animals). The second group (n = 11) received 1 ml of D-galactosamine (500 mg/kg i.p.) and endotoxin (100 micrograms/kg i.p.) simultaneously (sensitized animals). Endotoxin levels in the plasma of nonsensitized rats were 1,000-fold higher than those in the plasma of sensitized rats (69.33 x 10(3) +/- 22.42 x 10(3) versus 75.8 +/- 27.08 ng of LPS per ml), leading to a mortality of 91% in nonsensitized rats versus 82% in the sensitized-rat model within 48 h postendotoxemia. Serum transaminase activity increased up to 100-fold in sensitized rats as a sign of hepatocyte damage. Despite the large difference in LPS levels in plasma, the time courses of the plasma tumor necrosis factor (TNF) increase were similar in the two groups, with a peak at 2 h (54 +/- 12 ng/ml in nonsensitized rats versus 43 +/- 12 ng/ml in sensitized rats), and also similar to that of a group of nonsensitized rats (n = 5) that received a low dose of LPS (100 micrograms/kg) only (52 +/- 21 ng/ml), while D-galactosamine alone did not induce TNF release. Despite similar TNF levels, a more pronounced coagulation disorder was observed at 4 h in nonsensitized rats (with the high LPS dose) as measured by platelet counts, plasma fibrinogen levels, and activated partial thromboplastin time prolongation (191 x 10(3) +/- 107 x 10(3) cells per microliter, 40 +/- 24 mg/dl, and 53 +/- 15 s, respectively) than in rats with the low LPS dose either sensitized (495 x 10(3) +/- 153 x 10(3), 95 +/- 49, and 38 +/- 16, respectively) or nonsensitized (439 x 10(3) +/- 62 x 10(3), 170 +/- 18, and 35 +/- 11, respectively).(ABSTRACT TRUNCATED AT 400 WORDS)
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Selected References
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