Effects of NZ-107 on bronchoconstriction in guinea pigs.
The effect of 4-bromo-5-(3-ethoxy-4-methoxybenzylamino)-3(2H)-pyridazinone (NZ-107) on bronchoconstriction in guinea pigs was studied (1). The antigen-induced bronchoconstriction was studied in guinea pigs which had been passively sensitized by intravenous injection of antiserum containing anti-benzylpenicilloyl bovine-gamma-globulin IgE antibody. The sensitized guinea pigs were divided into two groups; one group was pretreated with metyrapone (11 beta-hydroxylase inhibitor in glucocorticoid metabolism) and the other with saline. The antigen-induced bronchoconstriction in the metyrapone-treated animals was more severe than that in the saline-treated animals. The asthmatic respiratory changes, in terms of prolongation of the ratio between expiration and inspiration, was also dramatically increased. NZ-107 at doses of 25 and 50 mg/kg significantly inhibited antigen-induced bronchoconstriction in both the saline-and metyrapone-treated animals. NZ-107 showed a tendency to inhibit accelerated severe asthmatic respiration more strongly in metyrapone-treated animals than in those treated with saline. Salbutamol inhibited antigen-induced bronchoconstriction in saline-treated animals, but its efficacy decreased in metyrapone-treated animals. Unlike salbutamol, prednisolone and hydrocortisone showed the reverse effect, inhibiting bronchoconstriction in metyrapone-but not in saline-treated animals. Sodium cromoglycate inhibited antigen-induced bronchoconstriction in both saline- and metyrapone-treated animals (2). When a subthreshold dose of platelet-activating factor was injected into guinea pigs, airway responsiveness against histamine was clearly increased. NZ-107 at a dose of 0.2 mg/kg i.v. inhibited PAF-induced airway hyperreactivity.(ABSTRACT TRUNCATED AT 250 WORDS)
Suda
H
H
Department of Pharmacology, Gifu Pharmaceutical University, Japan.
Nagai
H
H
Iwama
T
T
Koda
A
A
D000420:Albuterol / Q000494:pharmacology; D000818:Animals; D001249:Asthma / Q000139:chemically induced / Q000188:drug therapy; D016084:Bronchoconstriction / Q000187:drug effects*; D004205:Cromolyn Sodium / Q000494:pharmacology; D004195:Disease Models, Animal; D006168:Guinea Pigs; D006632:Histamine / Q000494:pharmacology; D006854:Hydrocortisone / Q000494:pharmacology; D008297:Male; D008797:Metyrapone / Q000494:pharmacology; D010972:Platelet Activating Factor; D011239:Prednisolone / Q000494:pharmacology; D011724:Pyridazines / Q000494:pharmacology*; D012119:Respiration / Q000187:drug effects; D013997:Time Factors
D010972:Platelet Activating Factor; D011724:Pyridazines; C062698:NZ 107; D006632:Histamine; D011239:Prednisolone; D004205:Cromolyn Sodium; D000420:Albuterol; D006854:Hydrocortisone; D008797:Metyrapone