Study to Investigate Safety, Tolerability and Pharmacokinetics of AZD2423 Multiple Doses in Healthy Volunteers

Three-part study investigating the safety and tolerability of AZD2423 multiple doses in 98 healthy volunteers: Part 1 80 young and elderly subjects in a parallel, double blind, randomised study. Part 2 - 6 subjects in an open, non-randomised study. Part 3 - 12 subjects in a three-way cross over, open label, partially randomised study. Part 1 has 2 Arms, AZD2423 or Placebo, Multiple dosing during 10-14 days . Part 2 has 1 Arm AZD2423 Multiple dosing and Part 3 has 3 Arms AZD2423 single dosing or AZD2423 single dosing with food or AZD2423 single dosing, Fasting Condition