GSK2190915 is currently in development for the treatment of asthma. This study aims to assess the safety and tolerability of single doses of GSK2190915 in healthy Japanese subjects. The study will also look at the pharmacokinetics (PK) and pharmacodynamics (PD) of single doses of GSK2190915 and aims to characterise the PK/PD relationship in healthy Japanese subjects. Twelve healthy Japanese subjects will take part in this single escalating dose study and subjects will receive one of five possible treatments, 10 mg, 50 mg, 150 mg, 450 mg GSK2190915 or placebo in each treatment period. Blood samples (for safety, pharmacokinetics and pharmacodynamics), urine samples (for safety and pharmacodynamics) and ECGs, blood pressure readings, physical examinations and a review of adverse events will take place at a number of timepoints pre and post each dose. A minimum 7 day washout between treatment periods will be required. Regardless if a subject completes or prematurely withdraws from the study, a follow up visit will be completed 7-10 days following last dose.