A Study to Investigate the Safety and Tolerability of Single and Repeat Doses of PC786

A Randomised, Single-blind, Placebo-controlled, Dose-escalation Study to Assess the Safety and Tolerability of Single and Repeat, Inhaled Doses of PC786 in Healthy Subjects Combined With a Randomised, Single-blind, Placebo-controlled, Parallel Group to Assess the Safety and Tolerability of a Single Dose of Inhaled PC786 in Subjects With Mild Asthma