To assess safety, tolerability and pharmacodynamics of intravenous MEDI8111 after single ascending doses.

Inclusion Criteria

• -Provision of signed and dated, written informed consent prior to any study specific procedures, Healthy male subjects aged 18-40 years with suitable veins for cannulation or repeated venepuncture, Have a body mass index (BMI) between 18 and 30 kg/m2 inclusive and weight at least 50 kg an no more than 100 kg inclusive, Male subjects should be willing to avoid fathering a child by either true abstinence or the use of two effective means of contraception from the day of dosing until 3 months after dosing with the IP. They should also be willing to use barrier methods from the day of dosing until 3 months after dosing.