TY - JOUR
T1 - Mast cells and leukotrienes mediate neutrophil sequestration and lung edema after remote ischemia in rodents
AU - Goldman, Gideon
AU - Welbourn, Richard
AU - Klausner, Joseph M.
AU - Kobzik, Lester
AU - Valeri, C. R.
AU - Shepro, David
AU - Hechtman, Herbert B.
PY - 1992/9
Y1 - 1992/9
N2 - Reperfusion of ischemic hindlimbs leads to leukotriene B4 (LTB4) and polymorphonuclear neutrophil (PMN)-dependent lung injury. Pulmonary mast cells are capable of synthesizing LTB4 and are potential mediators of this inflammatory response. This study tests their role in PMN sequestration and pulmonary edema after hindlimb ischemia. Anesthetized, mast cell-sufficient mice (n = 8) or their congeneic mast cell-deficient strain (n = 8) were subjected to 3 hours of hindlimb ischemia. After another 3 hours of reperfusion, plasma LTB4 levels rose to 651 pg/ml, higher than sham ischemic control (n = 8) values of 202 pg/ml (p < 0.05). At this time there was sequestration of neutrophils in the pulmonary microcirculation (54 PMN/10 high-power fields [HPF]) and an increase in lung wet/dry weight ratio ( W D) of 4.4. Both these values were higher (p < 0.05) than those in sham ischemic animals that showed sequestration of 18 PMN/10 HPF and a lung W D of 3.1. In contrast, mast cell-deficient mice showed an attenuation of ischemia- and reperfusion-induced rise in plasma LTB4 (507 pg/ml), fewer sequestered neutrophils (34 PMNs/10 HPF), and a reduction in lung W D to 3.9 (all p < 0.05). To test the role of lung LTB4 in determining PMN sequestration, rats (n = 78) were subjected to 3 hours of hindlimb ischemia. After 3 hours of reperfusion, plasma and bronchoalveolar lavage (BAL) LTB4 concentrations rose to 956 and 211 pg/ml, respectively-higher than sham values of 460 and 121 pg/ml (both p < 0.05). After 4 hours, plasma LTB4 levels had returned to baseline, whereas BAL LTB4 had increased further to 658 pg/ml, indicating lung origin. Treatment of other rats by localized lung lavage of the lipoxygenase inhibitor diethylcarbamazine (80 mg/kg in 0.1 ml twice) prevented the ischemia- and reperfusion-induced rise in BAL LTB4 (267 pg/ml) and limited local neutrophil sequestration (from 51 PMN/10 HPF after saline aspiration to 36 PMN/10 HPF) and lung W D (from 4.5 to 4.1) (all p < 0.05). The data indicate that after hindlimb ischemia pulmonary mast cells and localized LTB4 synthesis mediate, in part, the lung inflammatory response.
AB - Reperfusion of ischemic hindlimbs leads to leukotriene B4 (LTB4) and polymorphonuclear neutrophil (PMN)-dependent lung injury. Pulmonary mast cells are capable of synthesizing LTB4 and are potential mediators of this inflammatory response. This study tests their role in PMN sequestration and pulmonary edema after hindlimb ischemia. Anesthetized, mast cell-sufficient mice (n = 8) or their congeneic mast cell-deficient strain (n = 8) were subjected to 3 hours of hindlimb ischemia. After another 3 hours of reperfusion, plasma LTB4 levels rose to 651 pg/ml, higher than sham ischemic control (n = 8) values of 202 pg/ml (p < 0.05). At this time there was sequestration of neutrophils in the pulmonary microcirculation (54 PMN/10 high-power fields [HPF]) and an increase in lung wet/dry weight ratio ( W D) of 4.4. Both these values were higher (p < 0.05) than those in sham ischemic animals that showed sequestration of 18 PMN/10 HPF and a lung W D of 3.1. In contrast, mast cell-deficient mice showed an attenuation of ischemia- and reperfusion-induced rise in plasma LTB4 (507 pg/ml), fewer sequestered neutrophils (34 PMNs/10 HPF), and a reduction in lung W D to 3.9 (all p < 0.05). To test the role of lung LTB4 in determining PMN sequestration, rats (n = 78) were subjected to 3 hours of hindlimb ischemia. After 3 hours of reperfusion, plasma and bronchoalveolar lavage (BAL) LTB4 concentrations rose to 956 and 211 pg/ml, respectively-higher than sham values of 460 and 121 pg/ml (both p < 0.05). After 4 hours, plasma LTB4 levels had returned to baseline, whereas BAL LTB4 had increased further to 658 pg/ml, indicating lung origin. Treatment of other rats by localized lung lavage of the lipoxygenase inhibitor diethylcarbamazine (80 mg/kg in 0.1 ml twice) prevented the ischemia- and reperfusion-induced rise in BAL LTB4 (267 pg/ml) and limited local neutrophil sequestration (from 51 PMN/10 HPF after saline aspiration to 36 PMN/10 HPF) and lung W D (from 4.5 to 4.1) (all p < 0.05). The data indicate that after hindlimb ischemia pulmonary mast cells and localized LTB4 synthesis mediate, in part, the lung inflammatory response.
UR - http://www.scopus.com/inward/record.url?scp=0026661791&partnerID=8YFLogxK
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:0026661791
SN - 0039-6060
VL - 112
SP - 578
EP - 586
JO - Surgery
JF - Surgery
IS - 3
ER -
