Description Module
The Description Module contains narrative descriptions of the clinical trial, including a brief summary and detailed description. These descriptions provide important information about the study's purpose, methodology, and key details in language accessible to both researchers and the general public.
Description Module path is as follows:
Study -> Protocol Section -> Description Module
Description Module
Ignite Creation Date:
2025-12-25 @ 1:12 AM
Ignite Modification Date:
2025-12-25 @ 1:12 AM
NCT ID:
NCT00459693
Brief Summary:
The purpose of this protocol is to measure a receptor in the brain using positron emission tomography (PET) that is involved in inflammation.
Detailed Description:
The peripheral benzodiazepine receptor (PBR) is distinct from central benzodiazepine receptors associated with GABAa receptors. Although PBR was initially identified in peripheral organs such as kidneys, endocrine glands and lungs, later studies identified PBR in the central nervous system. In normal conditions, PBR is expressed in low levels in some neurons and glial cells. PBR can be a clinically useful marker to detect neuroinflammation, because activated microglial cells in inflammatory areas express much greater levels of PBR than in microglial cells in resting conditions.
PBR has been imaged with positron emission tomography (PET) using \[11C\]1-(2-chlorophenyl-N-methylpropyl)-3-isoquinoline carboxamide (PK11195). However, this classical ligand provides low levels of specific signal. Recently we developed a new ligand, N-acetyl-N-(2-methoxybenzyl)-2-phenoxy-5-pyridinamine \[11C\]PBR28, which showed much greater specific signal than \[11C\]PK11195 in non-human primates. ln the present protocol we plan to perform a kinetic brain imaging study with \[11C\]PBR28 in HlV-seronegative controls, HIV-seropositive, non-impaired patients, and HlV-seropositive patients with minor cognitive motor disorder(MCMD). Each subject will recieve a brain-dedicated PET scan with 20 mCi\[(11)C\]PBR28.
Study:
NCT00459693
Study Brief:
Protocol Section:
NCT00459693