Abstract
Background
Excessive alcohol consumption is a global health burden and requires a better understanding of its neurobiology. A lower density of brain microtubules is found in alcohol-related human brain disease postmortem and in rodent models of chronic alcohol consumption. Here, we report in vivo imaging studies of microtubules in brain using our recently reported Positron Emission Tomography (PET) tracer, [11C]MPC-6827, in chronic alcohol-consuming adult male C57BL/6 J mice and control mice.
Methods
In vivo PET imaging studies of [11C]MPC-6827 (3.7 ± 0.8 MBq) were performed in two groups of adult male mice: (1) water-consuming control mice (n = 4) and (2) mice that consumed 20% alcohol (w/v) for 4 months using the intermittent 2-bottle choice procedure that has been shown to lead to signs of alcohol dependence. Dynamic 63 min PET images were acquired using a microPET Inveon system (Siemens, Germany). PET images were reconstructed using the 3D-OSEM algorithm and analyzed using VivoQuant version 4 (Invicro, MA). Tracer uptake in ROIs that included whole brain, prefrontal cortex (PFC), liver and heart was measured and plotted as %ID/g over time (0–63 min) to generate time-activity curves (TACs).
Results
In general, a trend for lower binding of [11C]MPC-6827 in the whole brain and PFC of mice in the chronic alcohol group was found compared with control group. No group difference in radiotracer binding was found in the peripheral organs such as liver and heart.
Conclusions
This pilot study indicates a trend of loss of microtubule binding in whole brain and prefrontal cortex of chronic alcohol administered mice brain compared to control mice, but no loss in heart or liver. These results indicate the potential of [11C]MPC-6827 as a PET ligand for further in vivo imaging investigations of AUD in human.
Abbreviations
- Aβ:
-
Amyloid beta
- AD:
-
Alzheimer’s disease
- ALS:
-
Amyotrophic lateral sclerosis
- AUD:
-
Alcohol use disorder
- BBB:
-
Blood brain barrier
- IA:
-
Intermittent access
- ID/g:
-
Injected dose/gram
- MBq:
-
Mega becquerel
- MT:
-
Microtubule
- PET:
-
Positron emission tomography
- PFC:
-
Prefrontal cortex
- PTM:
-
Post-translational modifications
- TAC:
-
Time-activity curves
- SEM:
-
Standard error of the mean
- SUV:
-
Standardized uptake values
- W/v:
-
Weight per volume
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Funding
This work was Funded by NCATS UL1TR001873 (Reilly) Irving Institute/CTSA Translational Therapeutics Accelerator.
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JSDK conceived the idea. JSDK, MCS, and AM designed the experiments. JSDK, MCS, AM, PC, JP, and JC performed the experiments. JSDK, AM, and MCS performed all analyses. JSDK, AM, MCS, and AM analyzed and interpret the data. JSDK drafted the manuscript. The manuscript was written through contributions of all authors and all authors have given approval to the final version of the manuscript.
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Dileep Kumar, J.S., Molotkov, A., Salling, M.C. et al. In vivo evaluation of a microtubule PET ligand, [11C]MPC-6827, in mice following chronic alcohol consumption. Pharmacol. Rep 74, 241–247 (2022). https://doi.org/10.1007/s43440-021-00311-6
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DOI: https://doi.org/10.1007/s43440-021-00311-6