title: Effect of fudosteine, a cysteine derivative, on blood flow of tracheal microvasculature increased by airway inflammation.
abstract: We examined the effect of fudosteine, a cysteine derivative, on blood flow of tracheal microvasculature increased by airway inflammation. Airway inflammation was elicited by sulfur dioxide (SO(2)) exposure for 2 weeks in rabbits. Each drug (500 mg/kg, p.o.) or 0.5% carboxymethylcellulose-Na (control group) was daily administered just before SO(2) exposure. After final SO(2) exposure was finished, blood flow of tracheal microvasculature was measured by blood perfusion monitor. Fudosteine or S-carboxymethylcysteine (S-CMC) significantly suppressed blood flow of tracheal microvasculature increased by SO(2) exposure. However, no effect of fudosteine was observed on the pharmacological microvascular response in trachea of SO(2)-exposed rabbits. On the other hand, fudosteine or S-CMC scavenged superoxide anion generated from rat neutrophils, and enzymatically generated from xanthine oxidase-acetaldehyde reaction. The results suggest that suppressive action in increased tracheal blood flow of fudosteine is due to anti-inflammatory activity, at least in part, via scavenging of superoxide anion.
authors.affiliation: Central Research Laboratories, SS Pharmaceutical Co., Ltd., 1143 Nanpeidai, Narita 286-8511, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Takahashi
authors.forename: H
authors.initials: H
authors.lastname: Kai
authors.forename: M
authors.initials: M
authors.lastname: Otsuka
authors.forename: H
authors.initials: H
authors.lastname: Mizuno
authors.forename: T
authors.initials: T
authors.lastname: Koda
authors.forename: T
authors.initials: T
authors.lastname: Miyata