The purpose of this study is to assess safety, tolerability, pharmacokinetics and pharmacodynamic effects (24-hours plasma cortisol area under curve, plasma cortisol pre and post ACTH stimulation, dehydroepiandrosterone sulphate (DHEAS), osteocalcin and 24 hours urine cortisol) of AZD5423 following administration of single and multiple ascending doses in healthy male Japanese subjects.