A Study of a Single Ascending Dose Study of DS-7011a in Healthy Subjects

This study will assess the safety, PK, and PD properties of single ascending intravenous (IV) and subcutaneous (SC) doses of DS-7011a in healthy participants. This study will be conducted in 3 stages: * Stage 1 - single ascending IV dose cohorts of DS-7011a (ie, up to 6 dose levels will be assessed starting at 0.1 mg/kg); * Stage 2 - single ascending SC cohorts of DS-7011a (ie, up to 3 dose levels centered around the estimated therapeutic dose confirmed in Stage 1 will be assessed); and * Stage 3 - a single IV cohort of DS-7011a in healthy participants of Japanese ethnicity (ie, 1 dose level at the estimated therapeutic dose as confirmed in Stage 1 will be assessed).