Kinetic modeling of [18 F]VAT, a novel radioligand for positron emission tomography imaging vesicular acetylcholine transporter in non-human primate brain.

Abstract

Molecular imaging of vesicular acetylcholine transporter (VAChT) in the brain provides an important cholinergic biomarker for the pathophysiology and treatment of dementias including Alzheimer's disease. In this study, kinetics modeling methods were applied and compared for quantifying regional brain uptake of the VAChT-specific positron emission tomography radiotracer, ((-)-(1-(-8-(2-fluoroethoxy)-3-hydroxy-1,2,3,4-tetrahydronaphthalen-2-yl)piperidin-4-yl)(4-fluorophenyl)-methanone) ([18 F]VAT) in macaques. Total volume distribution (VT ) estimates were compared for one-tissue compartment model (1TCM), two-tissue compartment model (2TCM), Logan graphic analysis (LoganAIF) and multiple linear analysis (MA1) with arterial blood input function using data from three macaques. Using the cerebellum-hemispheres as the reference region with data from seven macaques, three additional models were compared: reference tissue model (RTM), simplified RTM (SRTM), and Logan graphic analysis (LoganREF). Model selection criterion indicated that a) 2TCM and SRTM were the most appropriate kinetics models for [18 F]VAT; and b) SRTM was strongly correlated with 2TCM (Pearson's coefficients r > 0.93, p < 0.05). Test-retest studies demonstrated that [18 F]VAT has good reproducibility and reliability (TRV < 10%, ICC > 0.72). These studies demonstrate [18 F]VAT is a promising VAChT positron emission tomography tracer for quantitative assessment of VAChT levels in the brain of living subjects.

• Authors: Hongjun Jin, Xuyi Yue, Hui Liu, Junbin Han, Hubert Flores, Yi Su, Stanley M Parsons, Joel S Perlmutter, Zhude Tu
• Journal: Journal of neurochemistry (J Neurochem) Vol. 144 Issue 6 Pg. 791-804 (03 2018) ISSN: 1471-4159 [Electronic] England
• PMID: 29315563 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)
• Copyright: © 2018 International Society for Neurochemistry.

Chemical References

• Fluorine Radioisotopes
• Radiopharmaceuticals
• Vesicular Acetylcholine Transport Proteins
• Fluorine-18

Topics

• Animals
• Brain (diagnostic imaging, metabolism)
• Fluorine Radioisotopes (pharmacokinetics)
• Kinetics
• Macaca fascicularis
• Male
• Models, Neurological
• Positron-Emission Tomography (methods)
• Radiopharmaceuticals (pharmacokinetics)
• Reproducibility of Results
• Vesicular Acetylcholine Transport Proteins (metabolism)