title: The detection of 5-lipoxygenase and cyclo-oxygenase products in sputum of patients with chronic bronchitis and bronchiectasis.
abstract: Leukotrienes (LTs) and prostanoids (Ps) were detected in sputum of patients with chronic bronchitis and/or bronchiectasis (CB/B) using selective superfusion bioassay and radioimmunoassay (RIA) techniques. Analysis of sputum extracts showed a 4-fold increase in the level of LTB4 compared to the cysteinyl-containing LTs (LTC4/LTD4). The measurement of cyclo-oxygenase products (COPs) indicated relatively greater amounts of the vasodilator prostaglandin E2 (PGE2) and prostacyclin (PGI2) compared to the vasoconstrictor prostaglandin F2 alpha (PGF2 alpha) and thromboxane A2 (TxA2) agents (70:30% of total COPs respectively). The presence of eicosanoids (LTs and Ps) in sputum of patients with CB/B suggest that these biologically active substances may act as mediators of bronchoconstriction and inflammation in these diseases.
mesh_terms: D000328:Adult; D000368:Aged; D000818:Animals; D001094:Arachidonate 5-Lipoxygenase / Q000378:metabolism*; D001091:Arachidonate Lipoxygenases / Q000378:metabolism*; D001987:Bronchiectasis / Q000201:enzymology*; D001991:Bronchitis / Q000201:enzymology*; D005260:Female; D006168:Guinea Pigs; D006801:Humans; D066298:In Vitro Techniques; D007975:Leukotriene B4 / Q000032:analysis* / Q000494:pharmacology; D008168:Lung / Q000187:drug effects; D008297:Male; D008875:Middle Aged; D009130:Muscle, Smooth / Q000187:drug effects; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism*; D011453:Prostaglandins / Q000032:analysis*; D011863:Radioimmunoassay; D013189:SRS-A / Q000032:analysis* / Q000494:pharmacology; D013183:Sputum / Q000032:analysis*
chemical_list: D011453:Prostaglandins; D013189:SRS-A; D007975:Leukotriene B4; D001091:Arachidonate Lipoxygenases; D001094:Arachidonate 5-Lipoxygenase; D011451:Prostaglandin-Endoperoxide Synthases