title: Enhancement of pulmonary drug absorption in the rat by bromphenol blue and related dyes.
abstract: 1. Pulmonary absorption studies in the rat showed that intratracheally administered 5-10 mM bromphenol blue, bromcresol green and bromthymol blue markedly increased the absorption rate of 0.1 mM phenol red. 2. Similarly, 1-10 mM bromphenol blue increased the absorption rate of 0.1 mP p-,minohippuric acid, tetraethylammonium and mannitol by 2- to 18-fold in a concentration-dependnet manner. 3. Mannitol absorption was enhanced more by bromthymol blue, sulphobromophthalein, bromcresol purple, thymol blue and bromcresol green than by bromphenol blue or m-cresol purple. Chlorphenol red and phenol red had no effect on mannitol absorption. 4. The results indicated that certain sulphonic acid dyes increase the permeability of the respiratory tract epithelium, perhaps by increasing its porosity.
mesh_terms: D000618:Aminohippuric Acids / Q000378:metabolism*; D000818:Animals; D001692:Biological Transport / Q000187:drug effects; D001961:Bromcresol Green / Q000494:pharmacology; D001978:Bromphenol Blue / Q000494:pharmacology*; D001979:Bromthymol Blue / Q000494:pharmacology; D004396:Coloring Agents / Q000494:pharmacology*; D007700:Kinetics; D008168:Lung / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008353:Mannitol / Q000378:metabolism*; D010635:Phenolphthaleins / Q000378:metabolism*; D010636:Phenols / Q000494:pharmacology*; D010637:Phenolsulfonphthalein / Q000378:metabolism*; D051381:Rats; D013757:Tetraethylammonium Compounds / Q000378:metabolism*; D010130:p-Aminohippuric Acid / Q000378:metabolism*
chemical_list: D000618:Aminohippuric Acids; D004396:Coloring Agents; D010635:Phenolphthaleins; D010636:Phenols; D013757:Tetraethylammonium Compounds; D001978:Bromphenol Blue; D008353:Mannitol; D001961:Bromcresol Green; D010637:Phenolsulfonphthalein; D001979:Bromthymol Blue; D010130:p-Aminohippuric Acid