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. 1987 Aug;206(2):162–167. doi: 10.1097/00000658-198708000-00008

Pulmonary leukosequestration induced by hind limb ischemia.

H Anner, R P Kaufman Jr, L Kobzik, C R Valeri, D Shepro, H B Hechtman
PMCID: PMC1493098  PMID: 3606241

Abstract

Lower torso ischemia leads to acute respiratory failure, an event associated with the accumulation of inflammatory cells in the lungs. This study tests whether ischemia-induced eicosanoid synthesis leads to polymorphonuclear leukocyte (PMN) accumulation in the lungs. Anesthetized rats (N = 51) were randomized into five groups: nonischemic sham rats (N = 10); the remaining four groups were rats made ischemic for 4 hours with bilateral thigh tourniquets treated just before tourniquet release with saline vehicle (N = 17): the thromboxane (Tx) synthase inhibitor OKY-046 (Ono Pharmaceutica, Osaka, Japan) 2 mg/kg intravenously every 2 hours (N = 8); the lipoxygenase inhibitor diethylcarbamazine (DEC) (Sigma, St. Louis, MO) 0.2 mg/kg/min intravenously (N = 8); the platelet-activating factor receptor antagonist SRI (Sandoz Inc., East Hanover, NJ) 63-072 3 mg/kg intravenously every 30 minutes (N = 8). Four hours after ischemia, plasma TxB2 levels in the ischemic placebo-treated group was 3570 +/- 695 pg/mL, compared with 495 +/- 73 pg/mL in sham rats (p less than 0.001). Lung microscopy showed foci of proteinaceous exudate in alveoli and 121 +/- 10 PMN/20 high power fields (HPF) compared with 59 +/- 9 PMN/20 HPF in the sham group (p less than 0.001). One day after ischemia PMN accumulations remained elevated at 119 PMN/20 HPF. Pretreatment with OKY-046 led to reduced TxB2 levels of 149 +/- 17 pg/mL, normal lung histology, and 83 +/- 13 PMN/20 HPF, a value similar to that of the sham group and lower than that of the placebo-treated group (p less than 0.05). Treatment with DEC yielded TxB2 levels of 1419 +/- 492 pg/mL, which was lower than that of the placebo group (p less than 0.05) but higher than that of the sham group (p less than 0.05). Microscopy showed normal lungs with 79 +/- 7 PMN/20 HPF lower than the placebo group (p less than 0.05). SRI 63-072 did not inhibit Tx synthesis or leukosequestration in the lungs. Platelet counts decreased in all groups relative to sham animals (p less than 0.05). The results indicate that Tx synthesis induced by ischemia moderates PMN accumulations in the lungs. Inhibition of lipoxygenase is believed to prevent PMN accumulations both by limiting leukotriene-induced Tx synthesis as well as by limiting production of chemoattractants.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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