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Studies Recruiting Only Men

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Featured Studies

Featured studies include only those currently recruiting participants. Studies with the most recent start date appear first.

ATN 151 Work-to-Prevent: Employment as HIV Prevention

Study Type: Interventional
Start Date: March 20, 2018
Location: Chicago, Illinois
Eligibility: Males, Ages 16–24, Accepts Healthy Volunteers

The investigators aim to pilot-test a novel social and structural-level HIV intervention for YMSM and YTW of color ages16-24.

Youth mHealth Adherence Intervention for HIV+ YMSM

Study Type: Interventional
Start Date: May 22, 2017
Location: Philadelphia, Pennsylvania
Eligibility: Males, Ages 14–24, Accepts Healthy Volunteers

This study will help determine feasibility, acceptability, and preliminary efficacy of an app for HIV medication adherence over a 3-month period. Participation is 3 months consisting of two study visits: An initial study visit and a 3 month follow up visit with both visits lasting about 60-90 minutes. The participant must use the study application (app) at least once daily, and at study visits, must complete surveys.

Autism Oxytocin Brain Project

Study Type: Interventional
Start Date: May 10, 2017
Location: Atlanta, Georgia
Eligibility: Males, Ages 18–45, Accepts Healthy Volunteers

The main goal of the study is to look at the effects of intranasal oxytocin on the brain in Autism Spectrum Disorder (ASD). Oxytocin is a hormone that exists naturally in the body and the brain. It affects a wide range of social behaviors and emotions. Investigators also seek to study how the effects of oxytocin treatment can be affected by genetic, immune and environmental factors.

Stigma and Online Counseling to Increase HIV/STI Testing

Study Type: Interventional
Start Date: December 31, 2016
Location: Atlanta, Georgia
Eligibility: Males, Ages 18 and Older, Does Not Accept Healthy Volunteers

The alarmingly high rates of HIV/STI (sexually transmitted infections) observed among Black men who have sex with men (BMSM) necessitate a new model for engaging BMSM. New approaches include addressing stigma related concerns and structural barriers in order to increase HIV/STI testing uptake. This research includes a 2 x 2 factorial design to test an intervention that is aimed at increasing HIV/STI testing uptake among BMSM; this design includes testing HIV/STI stigma focused counseling, and online HIV/STI test counseling with at-home, self-administered HIV and STI test kits.

Safer Sex Program for Young African-American Men

Study Type: Interventional
Start Date: September 30, 2012
Location: Jackson, Mississippi
Eligibility: Males, Ages 15–29, Accepts Healthy Volunteers

To evaluate the efficacy of the adapted program a randomized controlled trial enrolling 620 eligible African American men who have sex with men (MSM) will be conducted. Men in the treatment condition will be compared to men receiving the control condition comprised of standard of care counseling from the clinic plus a free bag of condoms and water-based lubricants. This two-arm trial will test four hypotheses:

Aim: To test the efficacy of a brief, clinic-based and theory-guided, intervention designed to reduce STD incidence and risk of HIV acquisition/transmission among young African American men (15-29 years old) having sex with men and presenting for STD testing.

H1. Men randomized to receive the intervention will have a lower incidence rate of laboratory-confirmed STDs at each of three follow-up assessments compared to those receiving the control condition.

H2. Men randomized to receive the intervention will report significantly fewer acts of unprotected penetrative sex (penile-vaginal or penile-anal) between follow-up assessments compared to those receiving the control condition.

H3. Men randomized to receive the intervention will report having significantly fewer unprotected penetrative sex partners (for penile-vaginal or penile-anal sex) between follow-up assessments compared to those receiving the control condition.

H4. Men randomized to receive the intervention will report having significantly fewer negative experiences with condom use between follow-up assessments compared to those receiving the control condition.

H5. Men randomized to receive the intervention will demonstrate significantly greater improvement in condom application skills, throughout the 12-month study, compared to those receiving the control condition.

Imaging Cannabinoid Receptors Using Positron Emission Tomography (PET) Scanning

Study Type: Observational
Start Date: July 31, 2010
Location: New Haven, Connecticut
Eligibility: Males, Ages 18–55, Accepts Healthy Volunteers

The aim of the present study is to assess the availability of cannabinoid receptors (CB1R) in the human brain. CB1R are present in everyone's brain, regardless of whether or not someone has used cannabis. The investigators will image brain cannabinoid receptors using Positron Emission Tomography (PET) imaging and the radioligand OMAR, in healthy individuals and several conditions including 1) cannabis use disorders, 2) psychotic disorders, 3) prodrome of psychotic illness and 4) individuals with a family history of alcoholism, using the PET imaging agent or radiotracer, [11C]OMAR. This will allow us to characterize the number and distribution of CB1R in these conditions. It is likely that the list of conditions will be expanded after the collection of pilot data and as new data on cannabinoids receptor function and psychiatric disorders becomes available.

Those in the cannabis us disorder arm of the study will have a PET scan on at least three occasions: once while smoking as usual, once after 48-hours of abstinence from cannabis, and a final time after 4 weeks of abstinence. Additional scans may be conducted within the 4 weeks and the last scan may be conducted well beyond 4 weeks. Similarly, while most schizophrenia patients may get scanned just once, a subgroup of patients may get scanned more than once. For example to tease out the effects of medications, unmedicated patients may get scanned while unmedicated and again after treatment with antipsychotic medications. Similarly prodromes may get scanned while in the prodromal stage off medications, on medications and after conversion to schizophrenia.

Protein Synthesis in the Brain of Patients With Fragile X Syndrome

Study Type: Observational
Start Date: August 8, 2006
Location: Bethesda, Maryland
Eligibility: Males, Ages 18–24, Accepts Healthy Volunteers

Biosynthesis of proteins is essential for growth and continued maintenance of the entire neuron including axons, dendrites, and synaptic terminals, and it is clearly one of the important biochemical processes underlying adaptive changes in the nervous system. Studies in experimental animals with the quantitative autoradiographic L [1 (14)C]leucine method have demonstrated a number of the physiological and pathological conditions in which changes in regional rates of cerebral protein synthesis (rCPS) occur.

We have recently developed the first fully quantitative method for determining rCPS with positron emission tomography (PET). The PET method was adapted from the autoradiographic L [1 (14)C]leucine method; it uses L [1 (11)C]leucine as the PET tracer, dynamic scanning, and a kinetic modeling approach for quantification. This method was validated in nonhuman primates by comparison of PET measurements with those based on established biochemical and autoradiographic techniques.

The objective of the present study is to examine the degree to which changes in rCPS in human subjects can be quantified with the L [1 (11)C]leucine PET method. We propose three studies to be carried out sequentially. In Part I we will establish the L-[1-(11)C]leucine PET method in human subjects. In Part II we will measure rCPS in normal control subjects in two states: awake and under deep sedation/general anesthesia with propofol. A difference in rCPS between these two states may indicate that we can detect activity-dependent protein synthesis with the PET method. In Part III we will study subjects with fragile X syndrome. This patient group was chosen since the affected gene in fragile X syndrome codes for a protein that is thought to be a negative regulator of message translation. Thus an effect on protein synthesis may be very close to the underlying genetic abnormality in fragile X syndrome. Regionally selective increases in rCPS have been found in studies in a mouse model of this disease.

The present study will establish the sensitivity of the L [1 (11)C]leucine PET method to detect changes in rCPS in human subjects. A quantitative and sensitive method to measure rCPS with PET will augment the tools available for investigating the brain and its regional adaptive responses. Ultimately the method may have widespread applications, not only for the study of normal development and plasticity but also in clinical medicine, e.g., in the investigation of disorders of brain development, recovery from brain injury, and neurodegenerative diseases.

SPECIFIC AIMS

1. Establish the L-[1-(11)C]leucine PET method for measurement of rCPS in human subjects. Evaluate the optimal scan time and the variability of the measurement in an individual.

2. Determine the effect of deep sedation with propofol on rCPS in normal human subjects. We will use the [1-(11)C]leucine PET method to evaluate lambda, i.e., the fraction of the precursor pool for protein synthesis that is derived from arterial plasma, and rCPS in the same subjects under awake and deep sedation conditions.

I) Hypothesis 1a. Deep sedation with propofol has effects on rCPS.

II) Hypothesis 1b. Deep sedation with propofol has effects on values of lambda.

3. Assess the sensitivity of the [1-(11)C]leucine PET method to detect differences in rCPS in subjects with fragile X syndrome.

I) Hypothesis 3a. There are regionally selective changes in rCPS in subjects with fragile X syndrome compared with age-matched healthy controls. Regions affected include hippocampus, thalamus, hypothalamus, amygdala, and frontal and parietal cortex.

II) Hypothesis 3b. In centrum semiovale, cerebellum, striatum and occipital and temporal cortex rCPS are unchanged in subjects with fragile X syndrome compared with age-matched healthy controls.

III) Hypothesis 3c. Values of lambda in the brain as a whole and in the regions examined are unchanged in subjects with fragile X syndrome compared with age-matched healthy controls.

IV) Hypothesis 3d. The average rate of protein synthesis in the brain as a whole is unchanged in subjects with fragile X syndrome compared with age-matched healthy controls.