Modulation of airway responsiveness by anionic and cationic polyelectrolyte substances.
To elucidate the effects of anionic and cationic polyelectrolyte substance on bronchoconstriction, we examined the serial changes in respiratory resistance (Rrs) in ovalbumin-sensitized guinea pigs after antigen exposure with or without pre-inhalation of low-molecular-weight heparin, poly-L-glutamic acid, poly-L-lysine and dextran, and with or without oral intake of dalteparin. Both immediate and late responses after antigen exposure were significantly decreased after pretreatment with inhaled low-molecular-weight heparin and poly-L-glutamic acid compared with saline alone. The late response was significantly decreased after pretreatment with oral dalteparin. Both low-molecular-weight heparin and poly-L-glutamic acid significantly decreased the airway response to methacholine in sensitized guinea pigs. In sensitized guinea pigs, the airway response to methacholine was significantly increased after pretreatment with inhaled poly-L-lysine. Pretreatment with inhaled low-molecular-weight heparin before poly-L-lysine exposure significantly suppressed the airway hyperresponsiveness after inhaled poly-L-lysine. These findings indicated that the "cationic-anionic interaction" plays an important role in airway responsiveness.
Yahata
Tomoyuki
T
Division of Cardiovascular and Respiratory Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan.
Nishimura
Yoshihiro
Y
Maeda
Hitoshi
H
Yokoyama
Mitsuhiro
M
D000403:Airway Resistance / Q000187:drug effects; D000818:Animals; D001249:Asthma / Q000209:etiology; D016084:Bronchoconstriction / Q000187:drug effects*; D005260:Female; D006168:Guinea Pigs; D006495:Heparin, Low-Molecular-Weight / Q000494:pharmacology; D008297:Male; D016210:Methacholine Chloride / Q000494:pharmacology; D010047:Ovalbumin / Q000276:immunology; D011099:Polyglutamic Acid / Q000494:pharmacology*; D011107:Polylysine / Q000494:pharmacology*
D006495:Heparin, Low-Molecular-Weight; D016210:Methacholine Chloride; D011107:Polylysine; D011099:Polyglutamic Acid; D010047:Ovalbumin