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Effect of pranlukast, an oral leukotriene receptor antagonist, on leukotriene D4 (LTD4) challenge in normal volunteers.
Thorax. 1997 Jun; 52(6):519-22.T

Abstract

BACKGROUND

There is increasing evidence to show that leukotrienes are important mediators in asthma. Leukotriene receptor antagonists protect against antigen and exercise challenges in patients with chronic asthma. A study was undertaken to investigate the activity of the leukotriene receptor antagonist pranlukast (SB 205312, ONO-1078) in blocking bronchoconstriction induced by leukotriene D4 (LTD4) inhalation. The selectivity of pranlukast was evaluated using histamine challenge.

METHODS

Pranlukast, 450 mg twice daily, was given to eight healthy non-smoking men for five days in a randomised, double blind, placebo controlled, crossover study. The specific airways conductance (sGaw) was measured before and after bronchial provocation with inhaled LTD4 at 3.5 hours after the first dose and at 3.5 and 9.5 hours after the last dose of pranlukast on the morning of day 5. The concentration of LTD4 required to produce a fall in sGaw of 35% (PC35) was calculated. Subjects also underwent a histamine challenge 3.5 hours after a single dose of pranlukast, 450 mg, or placebo.

RESULTS

A single dose of pranlukast produced a 10.6 fold increase in PC35sGaw (95% confidence interval (CI) 4.4 to 25.5; p < 0.001) for LTD4 at 3.5 hours after dosing compared with placebo. Three and a half hours after the morning dose of pranlukast on day 5 the PC35sGaw for LTD4 was increased 25.9 fold (95% CI 10.8 to 62.2; p < 0.001) and was still increased sevenfold (95% CI 2.9 to 16.7; p < 0.001) relative to placebo 9.5 hours after administration of the morning dose. No significant differences were noted for the PC35sGaw to histamine for pranlukast compared with placebo.

CONCLUSIONS

This study shows that pranlukast is a potent and selective LTD4 receptor antagonist in humans which blocks LTD4 challenge after initial and repeated administration when given twice daily for five days.

Authors+Show Affiliations

Department of Respiratory Medicine, London Chest Hospital, UK.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9227717

Citation

O'Shaughnessy, T C., et al. "Effect of Pranlukast, an Oral Leukotriene Receptor Antagonist, On Leukotriene D4 (LTD4) Challenge in Normal Volunteers." Thorax, vol. 52, no. 6, 1997, pp. 519-22.
O'Shaughnessy TC, Georgiou P, Howland K, et al. Effect of pranlukast, an oral leukotriene receptor antagonist, on leukotriene D4 (LTD4) challenge in normal volunteers. Thorax. 1997;52(6):519-22.
O'Shaughnessy, T. C., Georgiou, P., Howland, K., Dennis, M., Compton, C. H., & Barnes, N. C. (1997). Effect of pranlukast, an oral leukotriene receptor antagonist, on leukotriene D4 (LTD4) challenge in normal volunteers. Thorax, 52(6), 519-22.
O'Shaughnessy TC, et al. Effect of Pranlukast, an Oral Leukotriene Receptor Antagonist, On Leukotriene D4 (LTD4) Challenge in Normal Volunteers. Thorax. 1997;52(6):519-22. PubMed PMID: 9227717.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of pranlukast, an oral leukotriene receptor antagonist, on leukotriene D4 (LTD4) challenge in normal volunteers. AU - O'Shaughnessy,T C, AU - Georgiou,P, AU - Howland,K, AU - Dennis,M, AU - Compton,C H, AU - Barnes,N C, PY - 1997/6/1/pubmed PY - 1997/6/1/medline PY - 1997/6/1/entrez SP - 519 EP - 22 JF - Thorax JO - Thorax VL - 52 IS - 6 N2 - BACKGROUND: There is increasing evidence to show that leukotrienes are important mediators in asthma. Leukotriene receptor antagonists protect against antigen and exercise challenges in patients with chronic asthma. A study was undertaken to investigate the activity of the leukotriene receptor antagonist pranlukast (SB 205312, ONO-1078) in blocking bronchoconstriction induced by leukotriene D4 (LTD4) inhalation. The selectivity of pranlukast was evaluated using histamine challenge. METHODS: Pranlukast, 450 mg twice daily, was given to eight healthy non-smoking men for five days in a randomised, double blind, placebo controlled, crossover study. The specific airways conductance (sGaw) was measured before and after bronchial provocation with inhaled LTD4 at 3.5 hours after the first dose and at 3.5 and 9.5 hours after the last dose of pranlukast on the morning of day 5. The concentration of LTD4 required to produce a fall in sGaw of 35% (PC35) was calculated. Subjects also underwent a histamine challenge 3.5 hours after a single dose of pranlukast, 450 mg, or placebo. RESULTS: A single dose of pranlukast produced a 10.6 fold increase in PC35sGaw (95% confidence interval (CI) 4.4 to 25.5; p < 0.001) for LTD4 at 3.5 hours after dosing compared with placebo. Three and a half hours after the morning dose of pranlukast on day 5 the PC35sGaw for LTD4 was increased 25.9 fold (95% CI 10.8 to 62.2; p < 0.001) and was still increased sevenfold (95% CI 2.9 to 16.7; p < 0.001) relative to placebo 9.5 hours after administration of the morning dose. No significant differences were noted for the PC35sGaw to histamine for pranlukast compared with placebo. CONCLUSIONS: This study shows that pranlukast is a potent and selective LTD4 receptor antagonist in humans which blocks LTD4 challenge after initial and repeated administration when given twice daily for five days. SN - 0040-6376 UR - https://www.unboundmedicine.com/medline/citation/9227717/Effect_of_pranlukast_an_oral_leukotriene_receptor_antagonist_on_leukotriene_D4__LTD4__challenge_in_normal_volunteers_ L2 - https://thorax.bmj.com/lookup/pmidlookup?view=long&amp;pmid=9227717 DB - PRIME DP - Unbound Medicine ER -