Imaging Multidrug Resistance P-glycoprotein Transport Function Using MicroPET with Technetium-94m-Sestamibi
The best characterized mechanism of multidrug resistance (MDR) in cancer involves the MDR1 efflux transporter P-glycoprotein (Pgp). The positron-emitting radiotracer hexakis (2-methoxyisobutylisonitrile)- 94m Tc ( 94m Tc-MIBI) was synthesized and validated in cell transport studies as a substrate fo...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2005-01-01
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| Series: | Molecular Imaging |
| Online Access: | https://doi.org/10.1162/15353500200504166 |
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| Summary: | The best characterized mechanism of multidrug resistance (MDR) in cancer involves the MDR1 efflux transporter P-glycoprotein (Pgp). The positron-emitting radiotracer hexakis (2-methoxyisobutylisonitrile)- 94m Tc ( 94m Tc-MIBI) was synthesized and validated in cell transport studies as a substrate for MDR1 Pgp. In vivo small-scale PET imaging and biodistribution studies of mdr1a/1b (−/−) gene deleted and wild-type mice demonstrated the use of 94m Tc-MIBI to detect Pgp function. The reversal effect of a Pgp modulator was shown in tissue distribution studies of KB 3–1 (Pgp-) and KB 8–5 (Pgp+) tumor-bearing nude mice. The current 94m Tc-MIBI experiments parallel previous studies employing 99m Tc-MIBI, showing essentially identical performance of the two technetium radiotracers and providing biological validation of 94m Tc-MIBI for PET imaging of multidrug resistance. |
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| ISSN: | 1536-0121 |