Journal Article First demonstration of in vivo mapping for regional brain monoacylglycerol lipase using PET with [11C]SAR127303

Yamasaki, Tomoteru  ,  Mori, Wakana  ,  Zhang, Yiding  ,  Hatori, Akiko  ,  Fujinaga, Masayuki  ,  Wakizaka, Hidekatsu  ,  Kurihara, Yusuke  ,  Lu, Wang  ,  Nengaki, Nobuki  ,  Ohya, Tomoyuki  ,  Liang, Huan  ,  Ming-Rong, Zhang

176pp.313 - 320 , 2018-05 , Elsevier
Monoacylglycerol lipase (MAGL) is a main regulator of the endocannabinoid system within the central nervous system (CNS). Recently, [11C]SAR127303 was developed as a promising radioligand for MAGL imaging. In this study, we aimed to quantify regional MAGL concentrations in the rat brain using positron emission tomography (PET) with [11C]SAR127303. An irreversible two-tissue compartment model (2-TCMi, k4 = 0) analysis was conducted to estimate quantitative parameters (k3, Ki2-TCMi, and λk3). These parameters were successfully obtained with high identifiability (<10 %COV) for the following regions ranked in order from highest to lowest: cingulate cortex > striatum > hippocampus > thalamus > cerebellum > hypothalamus ≈ pons. In vitro autoradiographs using [11C]SAR127303 showed a heterogeneous distribution of radioactivity, as seen in the PET images. The Ki2-TCMi and λk3 values correlated relatively highly with in vitro binding (r > 0.4, P < 0.005). The Ki2-TCMi values showed high correlation and low underestimation (<10%) compared with the slope of a Patlak plot analysis with linear regression (KiPatlak). In conclusion, we successfully estimated regional net uptake value of [11C]SAR127303 reflecting MAGL concentrations in rat brain regions for the first time.

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