Abstract
Purpose
To evaluate the function of multidrug and toxin extrusion proteins (MATEs) using 11C-labeled metformin ([11C]metformin) by positron emission tomography (PET).
Methods
PET was performed by intravenous bolus injection of [11C]metformin. Pyrimethamine at 0.5 and 5 mg/kg was intravenously administered to mice 30 min prior to the scan. Integration plot analysis was conducted for calculating liver (CLuptake,liver), kidney (CLuptake,kidney) tissue uptake, intrinsic biliary (CLint,bile) and urinary (CLint,urine) excretion clearances of [11C]metformin.
Results
Visualization by PET showed that pyrimethamine increased concentrations of [11C]metformin in the liver and kidneys, and decreased the concentrations in the urinary bladder without changing the blood profiles. Pyrimethamine had no effect on the CLuptake,liver and CLuptake,kidney, which were similar to the blood-flow rate. CLint,bile with regard to the liver concentration was unable to be determined, but administration of 0.5 and 5 mg/kg of pyrimethamine increased the liver-to-blood ratio to 1.6 and 2.3-fold, respectively, indicating that pyrimethamine inhibited the efflux of [11C]metformin from the liver. CLint,urine with regard to the corticomedullary region concentrations was decreased 37 and 68% of the control by administration of 0.5 and 5 mg/kg of pyrimethamine, respectively (P < 0.05).
Conclusions
Tissue concentration based investigations using [11C]metformin by PET enables the functional analysis of MATEs in the liver and kidneys.
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Abbreviations
- AUC:
-
The area under the concentration-time curve
- CLint,bile or urine :
-
The intrinsic bile or urinary excretion clearances
- CLrenal :
-
The renal clearance
- CLtot :
-
The total body clearance
- CLuptake,organ :
-
The uptake clearance in the liver or kidney
- MATEs:
-
Human multidrug and toxin extrusion proteins
- mMates:
-
Mouse multidrug and toxin extrusion proteins
- OCTs:
-
Human organic cation transporters
- mOcts:
-
Mouse organic cation transporters
- PET:
-
Positron emission tomography
- ROIs:
-
Regions of interest
- VE :
-
Extravascular space volume
- VOIs:
-
Volumetric regions of interest
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Acknowledgments
We thank Mr. Masahiro Kurahashi of Sumitomo Heavy Industry Accelerator Service Ltd. for operation of the cyclotron. This study was partly carried out as the Research Project for the “Establishment of Evolutional Drug Development with the Use of Microdose Clinical Trial” sponsored by the New Energy and Industrial Technology Development Organization. Part of this work was also supported by JSPS KAKENHI Grant number 24229002.
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The authors report no conflicts of interest.
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Supplemental Fig. 1
Time-radioactivity curves in the right ventricle obtained from PET imaging data analysis and the radioactivity in blood sample determined by gamma-counter. Open symbols represent control mice (n = 3; circles) and mice treated with 0.5 and 5 mg/kg of pyrimethamine (n = 4; triangles, n = 3; squares) from PET imaging data analysis. Closed symbols represent control mice (n = 3; circles) and mice treated with 0.5 and 5 mg/kg of pyrimethamine (n = 3; triangles, n = 3; squares) from blood sample determined by gamma-counter. (TIFF 68 kb)
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Shingaki, T., Hume, W.E., Takashima, T. et al. Quantitative Evaluation of mMate1 Function Based on Minimally Invasive Measurement of Tissue Concentration Using PET with [11C]Metformin in Mouse. Pharm Res 32, 2538–2547 (2015). https://doi.org/10.1007/s11095-015-1642-1
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DOI: https://doi.org/10.1007/s11095-015-1642-1