This study is designed to determine the safety, pharmacokinetics and pharmacodynamics of a single intravenous dose of TS23 in healthy adults.

This is a first-in-human, Phase 1 study of the safety, pharmacokinetics and pharmacodynamics of TS23 in healthy male volunteers.TS23 is a monoclonal antibody that inactivates alpha 2-antiplasmin. Four dose cohorts of six subjects will be studied in a single ascending dose trial at one clinical center.

Inclusion Criteria:

• Able to provide written informed consent
• Healthy males age 18 years to 60 years of age
• Body mass index ≥ 20 and ≤ 33 kg/m squared

Exclusion Criteria:

• Known allergies or hypersensitivities to blood products or derivatives or therapeutic proteins or product excipients or components of CHO cells
• Current alcohol or drug abuse or history of alcohol or drug abuse
• Participation in any trial with an investigational drug within 90 days prior to dosing
• Blood donation of more than 500 mL of blood within 90 days prior to dosing
• Any history of a bleeding or thrombotic disorder
• Any history of significant cardiac, pulmonary, renal, hepatic, neurologic, or immunologic disorder
• Over-the-counter medications, dietary supplements and herbal products (except a daily vitamin) within 14 days of drug administration or during the study
• No prescription medication for at least 14 days or 5-half-lives, whichever is longer, prior to study drug administration.
• Use of anticoagulants, fibrinolytic agents or non-steroidal anti-inflammatory medicines (except aspirin doses of 82 mg per day or less) for 2 weeks prior to and during the study
• Known hereditary fructosemia (due to sorbitol in the formulation)
• Any previous or current monoclonal antibody therapy
• History of trauma or surgery within the past 60 days or planned surgery within 30 days
• Abnormal baseline laboratory values or any laboratory values deemed clinically significant by the Investigator
• Recent history of head trauma in last 30 days prior to receiving TS23
• Unwillingness or inability to avoid contact sports or other activities with more than a small risk of head or facial trauma within 30 days of receiving TS23
• History of or risk of falls (e.g., due to dementia, frailty, etc.)
• Sexually active subjects must agree to use a reliable method of birth control (abstinence, condoms, vasectomy) and to not donate sperm for 3 months after receiving TS23