Pharmacologic and Clinical Testing of a D1 Agonist for Cognitive Enhancement in Neuropsychiatric Disorders

New York State Psychiatric Institute

Status and phase

Completed

Early Phase 1

Conditions

Schizophrenia

Schizoaffective Disorder

Treatments

Drug: Placebo

Drug: DAR-100A

Study type

Interventional

Funder types

Other

Identifiers

NCT01519557

U01MH076544-03 (U.S. NIH Grant/Contract)

#6329

Details and patient eligibility

About

The investigators propose to recruit individuals with schizophrenia who are symptomatically stable and already taking medications to participate in this study. The investigators will recruit 90 individuals with schizophrenia and randomize them to low and high doses of DAR-0100A, as well as to placebo. The investigators will have them stay in the hospital for several weeks and receive up to 10 doses of DAR-0100A. The investigators will also test their cognition before and after receiving DAR-0100A to see if DAR-0100A is helpful and perform MRI scans before and after taking the medication to see which areas of the brain are activated when DAR-0100A is administered. These tests will be very important because they will help the investigators determine whether the D1 receptor is a good treatment target for schizophrenia and whether more research and resources should be devoted to finding medications that target this system.

Patients with schizophrenia will be free of other medical, psychiatric and neurological disorders including alcohol and substance dependence, and will be able to understand the nature of the study and to provide informed consent.

Full description

Schizophrenia (SCZ) manifests as positive symptoms, negative symptoms and cognitive disturbances. To date, all of the available medications to treat schizophrenia bind primarily to the dopamine-2 (D2) receptor in the brain, and are only effective at treating the positive symptoms of schizophrenia. This is unfortunate given that negative and cognitive symptoms account for most of the disability in schizophrenia.

Emerging research over the past several decades has suggested a potential role for the dopamine-1 (D1) receptor in schizophrenia, as well as a role for D1 receptor stimulation in improving cognitive deficits. DAR-0100A is a new medication that binds selectively to the D1 receptor. It has been found to be safe when given to individuals with schizophrenia, and preliminary data suggests that it may be able to help with cognitive deficits.

The investigators propose to recruit individuals with schizophrenia who are symptomatically stable and already taking medications to participate in this study. The investigators will recruit 90 individuals with schizophrenia and randomize them to low and high doses of DAR-0100A, as well as to placebo. Patients will stay in the hospital for several weeks and receive up to 10 doses of DAR-0100A. The investigators will also test their cognition before and after receiving DAR-0100A to see if DAR-0100A is helpful and perform MRI scans before and after taking the medication to see which areas of the brain are activated when DAR-0100A is administered. These tests will be very important because they will help the investigators determine whether the D1 receptor is a good treatment target for schizophrenia and whether more research and resources should be devoted to finding medications that target this system.

Enrollment

68 patients

Sex

All

Ages

18 to 55 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Males or females between 18 and 55 years old
Fulfill Diagnostic and Statistical Manual, version 4 (DSM-IV) criteria schizophrenic illness, schizophreniform or schizoaffective disorder
A negative urine toxicology
Capacity to understand the study and to give written informed consent
Must be on a stable dose of risperidone, aripiprazole, lurasidone, iloperidone, paliperidone, or haloperidol for at least 4 weeks if oral adn 2 cycles if depot. Absence of any antipsychotic medications other than risperidone, aripiprazole, or haloperidol for at least 4 weeks if oral or 2 cycles if depot prior to the study. Mood stabilizers, benzodiazepines and antidepressants are allowed as long as the drugs have not been changed for 4 weeks.
Psychiatrically stable

Exclusion criteria

Pregnancy or lactation, lack of effective birth control during the 15 days before the initial day of the study and for the duration of the drug trial
Presence or positive history of severe medical or neurological illness, or any cardiovascular or liver disease
Any current use of amphetamines, opiates, cocaine, sedative-hypnotics, cannabis, or other psychoactive drugs (other than nicotine)
Metal implants or paramagnetic objects contained within the body which may interfere with MRI scan
A history of substance dependence (other than nicotine or cannabis) or substance abuse within the previous 6 months (other than nicotine)
Any current use of anticholinergic or anticoagulant medications. Any current use of any medications that can affect cognition or clotting other than occasional nonsteroidal antiinflammatory drug (NSAID)
Impaired intellectual functioning
Orthostatic hypotension
BP systolic BP <90 or > 140 or diastolic BP < 60 or > 90
Antipsychotic polypharmacy within the previous four weeks.