Evaluation of Substance P Neurotransmission in Panic Disorder by PET Imaging of NK1 Receptors With [18F]SPA-RQ

NCT ID: NCT00088738

Last Updated: 2017-07-02

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE1
• Total Enrollment: 84 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2004-07-27
• Study Completion Date: 2008-09-10

Brief Summary

This study is designed to observe the effects of a panic attack in patients with panic disorders and to demonstrate the involvement of Substance P in panic disorder, and thereby, further our understanding of its role in this illness. We will measure levels of Substance P in the brain by obtaining pictures of the brain using PET and MRI....

Detailed Description

The involvement of Substance P (SP) in depression and anxiety has been credibly demonstrated in a recent clinical trial. Although the precise physiological activation mechanism of the SP system is not yet known, the likelihood of exaggerated SP pathway activity in the pathogenesis of anxiety is supported in numerous animal studies that illustrate the anxiogenic, and anxiolytic effects of SP and SP antagonists (SPAs), respectively. Studies have further shown that SP release occurs in response to noxious, or aversive stimulation. SP stimulates NK1 receptors that then undergo endocytosis (i.e., internalization) resulting in a decrease in number of NK1 receptors on the cell surface. NK1 receptor quantification before, and after an aversive event, provides a dynamic measurement of SP neurotransmission.

In this protocol, we will use a new PET ligand that has demonstrated ability to serve as an NK1 receptor antagonist, [18F]SPA-RQ ( [18F]-labeled Substance P Antagonist Receptor Quantifier). Using this tracer, we will: 1.) quantify NK1 binding parameters and determine the reliability and reproducibility of these measures in 10 healthy controls, 2.) we will look for regional differences in NK1 receptor binding in 10 patients with panic disorder (PD) versus 10 normal controls, and 3.) We will perform a single-blind, placebo-controlled study to evaluate NK1 receptor binding in PD patients and controls following either saline or doxapram infusion, which is a respiratory stimulant, in 20 patients with panic disorder (PD) versus 20 normal controls. Doxapram acts on both peripheral and medullary chemoreceptors to increase the rate and depth of breathing. It appears to be a potent and specific panicogenic agent, triggering panic attacks. The majority of PD patients, but not controls, are expected to experience a panic attack (aversive event) following the doxapram infusion. Comparison of pre-panic and post-panic NK1 receptor binding in PD patients will provide an estimate of SP release. The goal of the present study is to demonstrate the involvement of SP in panic disorder, and thereby, further our understanding of its role in the psychopathology of this illness.

Conditions

Panic Disorder; Healthy

Study Design

• Primary Study Purpose: TREATMENT

Interventions

[18F] SPA-RQ

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

• Healthy Adults ages 18-50

• Ages 18-50
• Male or Female
• Informed consent given
• Subjects who regularly consume caffeinated beverages.

For Patients:

• Ages 18-65.
• DSM IV criteria for Panic Disorder
• Informed consent given.
• Subjects who regularly consume caffeinated beverages.

For Controls:

• Ages 18-65.
• Informed consent given.
• Subjects who regularly consume caffeinated beverages.

For Patients:

• Ages 18-65.
• DSM IV criteria for Panic Disorder
• Informed consent given.
• Subjects who regularly consume caffeinated beverages.

For Controls:

• Ages 18-65.
• Informed consent given.
• Subjects who regularly consume caffeinated beverages.

Exclusion Criteria

• History of psychiatric disease, substance dependence or traumatic brain injury, severe systemic disease, poor vision or hearing
• History of substance abuse within 6 months
• Abnormal laboratory tests, including HIV test
• Any prior participation in other research protocols involving radiation exposure within the past year
• Prior participation in other research protocols within the past year such that a radiation exposure together with the present study would exceed the annual limits. Limits: A total effective dose 2.5 rem in a year and 2.5 rad per year to the lens of the eyes, gonads and blood-forming organs; and 7.5 rad annually for all other organs.
• Pregnancy and Breast Feeding.
• Positive HIV test

• DSM-IV Axis I diagnostic criteria such as history of, or current Dx ADHD, mood/anxiety disorder, alcohol or psychoactive substance abuse/dependence
• Psychotropic medication or other drugs that may cross the blood brain barrier
• Traumatic brain injury, severe systemic disease
• Abnormal MRI other than minor atrophy
• Abnormal laboratory tests, including HIV test
• Claustrophobia
• Pregnancy or breast feeding
• Prior participation in other research protocols within the past year such that a radiation exposure together with the present study would exceed the annual limits. Limits: A total effective dose or 5.0 rem in a year
• Any condition that increases risk for MRI (e.g., pacemaker, metallic foreign body in the eye, etc.)
• Single radial and ulnar arterial circulation
• Individuals who recently donated blood
• Unable to lay on one's back for PET/MRI scans
• Novocaine allergy
• Positive HIV test

For Patients and Controls:

• Current diagnosis of substance abuse or dependence
• History of substance dependence
• Psychotropic medication in last 3 weeks (8 weeks for fluoxetine/Prozac) except for benzodiazepene during PET or MRI scans
• Abnormal MRI other than minor atrophy
• Abnormal laboratory tests, including HIV test
• Pulmonary disease (e.g. COPD, asthma)
• Claustrophobia
• History of hypertension, coronary artery disease and subjects who are taking sympathomimetic medications
• Pregnancy or breastfeeding
• Prior participation in other research protocols within the past year such that a radiation exposure together with the present study would exceed the annual limits. Limits: A total effective dose or 5.0 rem in a year
• Unable to lay on one's back for PET/MRI scans
• Any condition that increases risk for MRI (e.g., pacemaker, metallic foreign body in the eye, etc.)

For Patients and Controls:

• Current diagnosis of substance abuse or dependence
• History of substance dependence
• Psychotropic medication in last 3 weeks (8 weeks for fluoxetine/Prozac) except for benzodiazepene during PET or MRI scans
• Abnormal MRI other than minor atrophy
• Abnormal laboratory tests, including HIV test
• Pulmonary disease (e.g. COPD)
• Claustrophobia
• History of hypertension, coronary artery disease and subjects who are taking sympathomimetic medications
• Pregnancy or breastfeeding
• Prior participation in other research protocols within the past year such that a radiation exposure together with the present study would exceed the annual limits. Limits: A total effective dose or 5.0 rem in a year
• Unable to lay on one's back for PET/MRI scans
• Any condition that increases risk for MRI (e.g., pacemaker, metallic foreign body in the eye, etc.)

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

National Institute of Mental Health (NIMH)

NIH

Sponsor Role: lead

Locations

National Institutes of Health Clinical Center, 9000 Rockville Pike

Bethesda, Maryland, United States

Countries

United States

References

Kramer MS, Cutler N, Feighner J, Shrivastava R, Carman J, Sramek JJ, Reines SA, Liu G, Snavely D, Wyatt-Knowles E, Hale JJ, Mills SG, MacCoss M, Swain CJ, Harrison T, Hill RG, Hefti F, Scolnick EM, Cascieri MA, Chicchi GG, Sadowski S, Williams AR, Hewson L, Smith D, Carlson EJ, Hargreaves RJ, Rupniak NM. Distinct mechanism for antidepressant activity by blockade of central substance P receptors. Science. 1998 Sep 11;281(5383):1640-5. doi: 10.1126/science.281.5383.1640.

Reference Type: BACKGROUND

PMID: 9733503 (View on PubMed)

Stockmeier CA, Shi X, Konick L, Overholser JC, Jurjus G, Meltzer HY, Friedman L, Blier P, Rajkowska G. Neurokinin-1 receptors are decreased in major depressive disorder. Neuroreport. 2002 Jul 2;13(9):1223-7. doi: 10.1097/00001756-200207020-00031.

Reference Type: BACKGROUND

PMID: 12151774 (View on PubMed)

Deguchi K, Antalffy BA, Twohill LJ, Chakraborty S, Glaze DG, Armstrong DD. Substance P immunoreactivity in Rett syndrome. Pediatr Neurol. 2000 Apr;22(4):259-66. doi: 10.1016/s0887-8994(00)00120-x.

Reference Type: BACKGROUND

PMID: 10788742 (View on PubMed)

Other Identifiers

04-M-0189

Identifier Type: -

Identifier Source: secondary_id

040189

Identifier Type: -

Identifier Source: org_study_id