Pharmacokinetics - Pharmacodynamic Study of HT-2157 in Healthy Subjects and in Patients With Major Depressive Disorder

This is a two part study. The objective of Part 1 is to evaluate the safety, tolerability, and pharmacokinetics of HT-2157 administered for 7-days in healthy normal volunteers Part 2 is a randomized, double-blind, placebo-controlled, multiple ascending-dose evaluation of the safety, tolerability, pharmacokinetics of HT-2157 administered for 21-days in patients with major depressive disorder. The primary objective of Part 2 is to assess the CNS penetration of HT-2157 in cerebrospinal fluid. In addition, the potential activity of HT-2157 in this patient population may be assessed using exploratory biologic and pharmacodynamic markers of potential efficacy