HealthyPhase 1NCT07625345
Evaluation of [11C]ZTP-1 to Image PDE4B
A Phase 1 study testing 11C-ZTP-1 in people with Healthy, run by National Institute of Mental Health (NIMH) at 1 site in United States.
Trial summary
Background: PDE4B is a protein in cells that helps turn off certain chemical signals after they ve done their job. It controls inflammation, immune responses, and some brain signaling. Measuring PDE4B levels in the body can help doctors manage a disease or know if a treatment is working. Read more about this study
- Who is it for?
- Ages 18 to 101 yearsHealthy volunteers can take part
- Conditions the study is for
- Healthy
- What is being tested?
- 11C-ZTP-1
- Type of treatment
- Injection or infusion
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 40 participants
- Where
- 1 siteUnited States
- Study dates
- 1 Jul 2026to 3 Oct 2030
- Phase
- Phase 1
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 101 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- To be eligible to participate in this study, an individual must meet the following criteria:
- Aged 18 years or older.
- Must have undergone a screening assessment under protocol 01M-0254, "The Evaluation of Patients with Mood and Anxiety Disorders and Healthy Participants or protocol 17M0181 Recruitment and Characterization of Healthy Research Volunteers for NIMH Intramural Studies."
- Be healthy based on medical history, physical examination, and laboratory testing.
- Able to provide informed consent.
- Willingness to complete all study procedures including MRI tests.
- Have had their radial artery pulse checked for the presence of adequate ulnar collateral flow and the absence of any metal or foreign objects in both wrists.
- Agree to adhere to the lifestyle considerations
Who cannot join
- An individual who meets any of the following criteria will be excluded from participation in this study:
- Clinically significant abnormalities on EKG or laboratory testing. This includes CBC and acute care panel (Na, K, Cl, CO2, creatinine, glucose, urea nitrogen).
- History of neurologic illness or injury with the potential to affect study data interpretation.
- History of seizures, other than in childhood and related to fever.
- Recent exposure to radiation (i.e., PET from other research) that, when combined with this study, would be above the allowable limits.
- Inability to lie flat on camera bed for at least two hours, including claustrophobia and weight greater than the maximum for the scanner (500 lbs).
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- HIV infection.
- Pregnancy or breastfeeding.
- Must not have substance use disorder or alcohol use disorder.
- Unable to travel to the NIH.
- Unable to have an MRI scan (e.g., because of pacemakers or other implanted electrical devices, brain stimulators, dental implants, aneurysm clips (metal clips on the wall of a large artery), metallic prostheses (including metal pins and rods, heart valves, and cochlear implants), permanent eyeliner, implanted delivery pumps, shrapnel fragments, or metal fragments in the eye.
- Known hypersensitivity to phosphodiesterase-4 (PDE-4) inhibitors (e.g. apremilast, roflumilast, nerandomilast, crisborole).
- Taking CYP3A4 inhibitors (e.g. grapefruit juice, clarithromycin, erythromycin, ritonavir); CYP3A4 inducers (e.g. phenobarbital St. John's Wort, rifampicin) or oral contraceptives containing gestodene and ethinyl estradiol.
- Inclusion of children is not appropriate, because this protocol has more than minimal risk from radiation exposure without the possibility of direct benefit.
- Pregnant women will be excluded because this protocol involves exposure to ionizing radiation. Lactating women will be excluded because radioisotopes may be excreted in milk. We will perform a pregnancy test at screening and prior to all procedures to ensure participants are not pregnant. The test must be negative in order to continue on the study. In addition to completing a negative urine pregnancy test, on the day of PET scanning prior to PET scan procedures, participants of childbearing potential will undergo a clinical pregnancy screening interview with a licensed independent practitioner to confirm lack of pregnancy.
- Persons with HIV infection are excluded because HIV infection itself may change cAMP signaling.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
United States1 site, 1 recruiting
- Recruiting
National Institutes of Health Clinical Center
Bethesda, Maryland, 20892
NIH Clinical Center Office of Patient Recruitment (OPR), 800-411-1222 ext. TTY dial 711, ccopr@nih.gov
About this study
Background:
PDE4B is a protein in cells that helps turn off certain chemical signals after they ve done their job. It controls inflammation, immune responses, and some brain signaling. Measuring PDE4B levels in the body can help doctors manage a disease or know if a treatment is working. Researchers want to find out if a new tracer (a radioactive substance injected during imaging scans) can help them measure PDE4B in people more effectively.
Read more
Objective:
To test a new tracer ([11C]ZTP-1) during imaging scans of the brain and body in healthy people.
Eligibility:
Healthy people aged 18 and older. They must have been screened under protocols 01M-0254 or 17M0181.
Design:
Participants will have either 1 or 2 clinic visits.
During their first visit, all participants will have a positron emission tomography (PET)/computed tomography (CT) scan. Prior to the scan, they will have blood and urine tests and a test of their heart function. The study tracer will be given through a tube attached to a needle inserted into a vein in the arm. They will lie on a padded bed that fits inside a doughnut-shaped machine; the machine uses x-rays to create images of the inside of the body.
Some participants will have a PET/CT scan of their whole body. They will need only 1 visit. The visit will last up to about 8 hours.
Some participants will have a PET/CT scan of only their brain. They will also have a magnetic resonance imaging (MRI) scan of the brain. They may need to return for a second visit for the MRI scan.
Participants will receive a follow-up call to check on their well-being after their PET/CT scans.
Read the detailed description
Study Description:
This study is intended to provide information on the novel [11C]ZTP-1 radioligand and its ability to localize and measure PDE4B in the brain and body of healthy volunteers.
Objectives:
Primary Objective: To study the brain uptake of [11C]ZTP-1 and perform kinetic modeling of [11C]ZTP-1 in healthy volunteers.
Secondary Objective: To study brain retest variability and reliability, biodistribution, and dosimetry of [11C]ZTP-1 in healthy volunteers.
Endpoint:
Primary Endpoint: PDE4B density measured as distribution volume (VT), derived from kinetic modeling of [11C]ZTP-1 in the brain.
Secondary Endpoint: PDE4B density measured as distribution volume (VT) , evaluated in terms of test retest variability (absolute variability) and reliability (intraclass correlation coefficient [ICC]). Whole-body biodistribution and radiation burden, measured as Effective Dose (ED).)
- Conditions
- Healthy
- Being tested
- 11C-ZTP-1
- Keywords
- PET Imaging, 11C-ZTP-1
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
11C-ZTP-1Drug
Injected IV followed by PET scanning
| Study group | Role | What they receive |
|---|---|---|
| One-arm | Other | All subjects will receive the same tests. Receives: Drug: 11C-ZTP-1 |
What is being measured
The primary outcome is the main question the study is designed to answer.
Total Volume of Distribution
Quantification of 11C-ZPT-1
Measured: 120 minutes
Secondary outcomes (1)
Dosimetry, ICC, aTRV, and biodistribution.
Quantification of 11C-ZPT-1
Measured: 120 minutes
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted4 Jun 2026
- Study start1 Jul 2026
- Primary completion19 Mar 2029 (estimated)
- Study completion3 Oct 2030 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for HealthyStudies of the same condition, open and under way.
- More trials run by National Institute of Mental Health (NIMH)The sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 1
- Primary purpose
- Diagnosis
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 40 participants (estimated)
Sponsor and investigators
- Lead sponsor
- National Institute of Mental Health (NIMH)
- Sponsor type
- US National Institutes of Health
- Responsible party
- Sponsor
- Investigators
- Robert B Innis, M.D., Principal investigator, National Institute of Mental Health (NIMH)
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07625345
- Sponsor's protocol ID
- 10002536
- Other IDs
- 002536-M
- Status last verified
- 29 Sep 2026
- First submitted
- 3 Jun 2026
- Last updated
- 1 Oct 2026
- Results posted
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- Yes: The results will be submitted to ClinicalTrials.gov
Study at a glance
From the registry record, last updated by the sponsor on 1 Oct 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Evaluation of [11C]ZTP-1 to Image PDE4B
- ClinicalTrials.gov ID
- NCT07625345
- Acronym / sponsor ID
- 10002536
- Conditions
- Healthy
- Keywords
- PET Imaging, 11C-ZTP-1
- Phase
- Phase 1
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 40 participants (estimated)
- Lead sponsor
- National Institute of Mental Health (NIMH)US National Institutes of Health
- Study start
- 1 Jul 2026 (actual)
- Primary completion
- 19 Mar 2029 (estimated)
- Study completion
- 3 Oct 2030 (estimated)
- First posted
- 4 Jun 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Background:
PDE4B is a protein in cells that helps turn off certain chemical signals after they ve done their job. It controls inflammation, immune responses, and some brain signaling. Measuring PDE4B levels in the body can help doctors manage a disease or know if a treatment is working. Researchers want to find out if a new tracer (a radioactive substance injected during imaging scans) can help them measure PDE4B in people more effectively.
Objective:
To test a new tracer ([11C]ZTP-1) during imaging scans of the brain and body in healthy people.
Eligibility:
Healthy people aged 18 and older. They must have been screened under protocols 01M-0254 or 17M0181.
Design:
Participants will have either 1 or 2 clinic visits.
During their first visit, all participants will have a positron emission tomography (PET)/computed tomography (CT) scan. Prior to the scan, they will have blood and urine tests and a test of their heart function. The study tracer will be given through a tube attached to a needle inserted into a vein in the arm. They will lie on a padded bed that fits inside a doughnut-shaped machine; the machine uses x-rays to create images of the inside of the body.
Some participants will have a PET/CT scan of their whole body. They will need only 1 visit. The visit will last up to about 8 hours.
Some participants will have a PET/CT scan of only their brain. They will also have a magnetic resonance imaging (MRI) scan of the brain. They may need to return for a second visit for the MRI scan.
Participants will receive a follow-up call to check on their well-being after their PET/CT scans.
Detailed description
Study Description:
This study is intended to provide information on the novel [11C]ZTP-1 radioligand and its ability to localize and measure PDE4B in the brain and body of healthy volunteers.
Objectives:
Primary Objective: To study the brain uptake of [11C]ZTP-1 and perform kinetic modeling of [11C]ZTP-1 in healthy volunteers.
Secondary Objective: To study brain retest variability and reliability, biodistribution, and dosimetry of [11C]ZTP-1 in healthy volunteers.
Endpoint:
Primary Endpoint: PDE4B density measured as distribution volume (VT), derived from kinetic modeling of [11C]ZTP-1 in the brain.
Secondary Endpoint: PDE4B density measured as distribution volume (VT) , evaluated in terms of test retest variability (absolute variability) and reliability (intraclass correlation coefficient [ICC]). Whole-body biodistribution and radiation burden, measured as Effective Dose (ED).)
Study design
- Primary purpose
- Diagnosis
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| One-arm | Other | Drug: 11C-ZTP-1All subjects will receive the same tests. |
Who may qualify
- Ages
- 18 to 101 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (8 listed)
- To be eligible to participate in this study, an individual must meet the following criteria:
- Aged 18 years or older.
- Must have undergone a screening assessment under protocol 01M-0254, "The Evaluation of Patients with Mood and Anxiety Disorders and Healthy Participants or protocol 17M0181 Recruitment and Characterization of Healthy Research Volunteers for NIMH Intramural Studies."
- Be healthy based on medical history, physical examination, and laboratory testing.
- Able to provide informed consent.
Key exclusion criteria (16 listed)
- An individual who meets any of the following criteria will be excluded from participation in this study:
- Clinically significant abnormalities on EKG or laboratory testing. This includes CBC and acute care panel (Na, K, Cl, CO2, creatinine, glucose, urea nitrogen).
- History of neurologic illness or injury with the potential to affect study data interpretation.
- History of seizures, other than in childhood and related to fever.
- Recent exposure to radiation (i.e., PET from other research) that, when combined with this study, would be above the allowable limits.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| 11C-ZTP-1Injected IV followed by PET scanning | Drug | One-arm |
Primary outcome
Total Volume of Distribution
Time frame: 120 minutes
Quantification of 11C-ZPT-1
1 secondary outcome
Dosimetry, ICC, aTRV, and biodistribution.
Time frame: 120 minutes
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 1 Oct 2026.
- NIH Clinical Center Detailed Web PageLink provided by the sponsor.
- Individual participant dataSharing planned: Yes. The results will be submitted to ClinicalTrials.gov
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Robert B Innis, M.D. principal investigator
National Institute of Mental Health (NIMH)
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 1 study testing 11C-ZTP-1 in people with Healthy, run by National Institute of Mental Health (NIMH) at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 8 inclusion and 16 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 1 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Tara N Turon, C.R.N.P. ((301) 827-6599, tara.turon@nih.gov), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Total Volume of Distribution (time frame: 120 minutes). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 1 Oct 2026.