This study is the first administration of GSK1440115 to humans. GSK1440115 is a urotensin II receptor antagonist which is being developed for the treatment of asthma. This will be a two-part study to evaluate the safety, tolerability, and pharmacokinetics of single (Part A) and repeat (Part B) oral doses of GSK1440115 in healthy adult male and female (of non-child bearing potential) subjects. This study will be a randomized, single-blind, placebo-controlled, dose escalation design. Part A will evaluate a single dose of GSK1440115. Part B will evaluate repeat daily doses for 7 days.