Effect of MDL 105,212, a nonpeptide NK-1/NK-2 receptor antagonist in an allergic guinea pig model.
MDL 105,212 has been identified as a potent, nonpeptide NK-1 and NK-2 receptor antagonist that inhibits effects of substance P and neurokinin A in vitro and in vivo (Kudlacz et al., 1996). In the present study, the compound inhibited capsaicin-induced respiratory effects after p.o. administration (5-50 mg/kg) to conscious guinea pigs; nearly complete inhibition of dyspnea and cough was observed 1 hr after 50 mg/kg p.o., and efficacy persisted for approximately 11 hr. MDL 105,212 reduced pulmonary insufflation pressure and microvascular leakage in ovalbumin-sensitized animals in response to antigen-challenge relative to vehicle-treated animals. Attenuation of early-phase allergic responses may result from MDL 105,212 inhibition of antigen-induced histamine release from sensitized guinea pig lung observed in vitro. Airway hyperresponsiveness to methacholine occurred 24 hr after antigen-challenge in ovalbuminsensitized guinea pigs; this effect was inhibited by pretreatment with MDL 105,212 (50 mg/kg p.o.) 1 hr before ovalbumin exposure without affecting increased bronchoalveolar lavage eosinophil numbers. These data suggest that sensory neuropeptides play a role in some aspects of allergic airway responses and that tachykinin receptor antagonists may be useful in treatment of atopic respiratory diseases.
Kudlacz
E M
EM
Hoechst Marion Roussel, Cincinnati, Ohio 45215, USA.
Knippenberg
R W
RW
Logan
D E
DE
Burkholder
T P
TP
D000818:Animals; D016084:Bronchoconstriction / Q000187:drug effects; D002211:Capsaicin / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D006168:Guinea Pigs; D006636:Histamine Release / Q000187:drug effects; D006967:Hypersensitivity / Q000188:drug therapy*; D008297:Male; D064729:Neurokinin-1 Receptor Antagonists; D010047:Ovalbumin / Q000276:immunology; D010880:Piperidines / Q000494:pharmacology*; D011759:Pyrrolidines / Q000494:pharmacology*; D018041:Receptors, Neurokinin-2 / Q000037:antagonists & inhibitors*; D012119:Respiration / Q000187:drug effects
C099415:MDL 105212A; D064729:Neurokinin-1 Receptor Antagonists; D010880:Piperidines; D011759:Pyrrolidines; D018041:Receptors, Neurokinin-2; D010047:Ovalbumin; D002211:Capsaicin