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Lughezzani G, Casale P, Evangelista L. Re: Giuseppe Basile, Giuseppe Fallara, Paolo Verri, et al. The Role of 99mTc-Sestamibi Single-photon Emission Computed Tomography/Computed Tomography in the Diagnostic Pathway for Renal Masses: A Systematic Review and Meta-analysis. Eur Urol. 2024;85:63-71. Eur Urol 2024; 85:e76. [PMID: 38092612 DOI: 10.1016/j.eururo.2023.11.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 11/09/2023] [Indexed: 03/09/2024]
Affiliation(s)
- Giovanni Lughezzani
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy; Department of Urology, IRCCS Humanitas Research Hospital, Rozzano, Italy.
| | - Paolo Casale
- Department of Urology, IRCCS Humanitas Research Hospital, Rozzano, Italy
| | - Laura Evangelista
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy; Department of Nuclear Medicine, IRCCS Humanitas Research Hospital, Rozzano, Italy
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Hernández-Lozano I, Leterrier S, Mairinger S, Stanek J, Zacher AS, Breyer L, Hacker M, Zeitlinger M, Pahnke J, Tournier N, Wanek T, Langer O. Performance and Sensitivity of [ 99mTc]Tc-sestamibi Compared with Positron Emission Tomography Radiotracers to Measure P-glycoprotein Function in the Kidneys and Liver. Mol Pharm 2024; 21:932-943. [PMID: 38225758 PMCID: PMC10848257 DOI: 10.1021/acs.molpharmaceut.3c01036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 01/04/2024] [Accepted: 01/05/2024] [Indexed: 01/17/2024]
Abstract
P-glycoprotein (P-gp, encoded in humans by the ABCB1 gene and in rodents by the Abcb1a/b genes) is a membrane transporter that can restrict the intestinal absorption and tissue distribution of many drugs and may also contribute to renal and hepatobiliary drug excretion. The aim of this study was to compare the performance and sensitivity of currently available radiolabeled P-gp substrates for positron emission tomography (PET) with the single-photon emission computed tomography (SPECT) radiotracer [99mTc]Tc-sestamibi for measuring the P-gp function in the kidneys and liver. Wild-type, heterozygous (Abcb1a/b(+/-)), and homozygous (Abcb1a/b(-/-)) Abcb1a/b knockout mice were used as models of different P-gp abundance in excretory organs. Animals underwent either dynamic PET scans after intravenous injection of [11C]N-desmethyl-loperamide, (R)-[11C]verapamil, or [11C]metoclopramide or consecutive static SPECT scans after intravenous injection of [99mTc]Tc-sestamibi. P-gp in the kidneys and liver of the mouse models was analyzed with immunofluorescence labeling and Western blotting. In the kidneys, Abcb1a/b() mice had intermediate P-gp abundance compared with wild-type and Abcb1a/b(-/-) mice. Among the four tested radiotracers, renal clearance of radioactivity (CLurine,kidney) was significantly reduced (-83%) in Abcb1a/b(-/-) mice only for [99mTc]Tc-sestamibi. Biliary clearance of radioactivity (CLbile,liver) was significantly reduced in Abcb1a/b(-/-) mice for [11C]N-desmethyl-loperamide (-47%), [11C]metoclopramide (-25%), and [99mTc]Tc-sestamibi (-79%). However, in Abcb1a/b(+/-) mice, CLbile,liver was significantly reduced (-47%) only for [99mTc]Tc-sestamibi. Among the tested radiotracers, [99mTc]Tc-sestamibi performed best in measuring the P-gp function in the kidneys and liver. Owing to its widespread clinical availability, [99mTc]Tc-sestamibi represents a promising probe substrate to assess systemic P-gp-mediated drug-drug interactions and to measure renal and hepatic P-gp function under different (patho-)physiological conditions.
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Affiliation(s)
| | - Sarah Leterrier
- Laboratoire
d’Imagerie Biomédicale Multimodale (BIOMAPS), Université Paris-Saclay, CEA, CNRS, Inserm,
Service Hospitalier Frédéric Joliot, 91401 Orsay, France
| | - Severin Mairinger
- Department
of Clinical Pharmacology, Medical University
of Vienna, 1090 Vienna, Austria
- Department
of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna, Austria
| | - Johann Stanek
- Department
of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna, Austria
| | - Anna S. Zacher
- Department
of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna, Austria
| | - Lara Breyer
- Department
of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna, Austria
| | - Marcus Hacker
- Department
of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna, Austria
| | - Markus Zeitlinger
- Department
of Clinical Pharmacology, Medical University
of Vienna, 1090 Vienna, Austria
| | - Jens Pahnke
- Department
of Pathology, Section of Neuropathology, Translational Neurodegeneration
Research and Neuropathology Lab, University
of Oslo (UiO) and Oslo University Hospital (OUS), 0372 Oslo, Norway
- Lübeck
Institute of Experimental Dermatology (LIED), Pahnke Lab, University of Lübeck and University Medical
Center Schleswig-Holstein, 23538 Lübeck, Germany
- Department
of Pharmacology, Faculty of Medicine, University
of Latvia, 1004 Ri̅ga, Latvia
- Department
of Neurobiology, The Georg S. Wise Faculty of Life Sciences, Tel Aviv University, 6997801 Tel Aviv, Israel
| | - Nicolas Tournier
- Laboratoire
d’Imagerie Biomédicale Multimodale (BIOMAPS), Université Paris-Saclay, CEA, CNRS, Inserm,
Service Hospitalier Frédéric Joliot, 91401 Orsay, France
| | - Thomas Wanek
- Department
of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna, Austria
| | - Oliver Langer
- Department
of Clinical Pharmacology, Medical University
of Vienna, 1090 Vienna, Austria
- Department
of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, 1090 Vienna, Austria
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Jain D. Molecular imaging of tumor-specific markers and their expression in other organs. J Nucl Cardiol 2021; 28:822-824. [PMID: 33000401 DOI: 10.1007/s12350-020-02310-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 06/02/2020] [Indexed: 11/25/2022]
Affiliation(s)
- Diwakar Jain
- Cardio-Oncology Service, Nuclear Cardiovascular Imaging Laboratory, Department of Cardiology, Westchester Medical Center, New York Medical College, 100 Woods Road, Valhalla, NY, 10595, USA.
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Ghadi M, Hosseinimehr SJ, Amiri FT, Mardanshahi A, Noaparast Z. Itraconazole synergistically increases therapeutic effect of paclitaxel and 99mTc-MIBI accumulation, as a probe of P-gp activity, in HT-29 tumor-bearing nude mice. Eur J Pharmacol 2021; 895:173892. [PMID: 33497608 DOI: 10.1016/j.ejphar.2021.173892] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 01/08/2021] [Accepted: 01/13/2021] [Indexed: 12/17/2022]
Abstract
P-glycoprotein (P-gp), is an important efflux pump involved in chemotherapy resistance in human colon cancer. We investigated the efficacy of itraconazole as a P-gp inhibitor and its therapeutic synergistic relationship to paclitaxel through 99mTc-MIBI accumulation in HT-29 tumor-bearing nude mice. Histopathological screening along with in vitro experiments was done for further assessment. Itraconazole successfully inhibited P-gp mediated 99mTc-MIBI efflux, increasing its in vitro accumulation in itraconazole-receiving dishes. Notably, the co-administration of itraconazole with paclitaxel significantly enhanced the in vitro cytotoxicity effect of paclitaxel in itraconazole + paclitaxel wells containing HT-29 cells. Compared to the control, tumor volume in mice treated with itraconazole, paclitaxel and itraconazole +paclitaxel showed growth suppression approximately by 36.21, 60.02, and 73.3% respectively. And compared to paclitaxel group, the nude mice co-treated with paclitaxel and itraconazole showed suppression of tumor growth by about 33.31 % at the end of the treatment period. Also the biodistribution result showed that the co-administration of itraconazole with paclitaxel raised the mean tumor radioactivity accumulation compared to control and paclitaxel group. When given paclitaxel alone, the ID% of hepatic and cardiac tissue was reduced while co-administration of itraconazole with paclitaxel increased 99mTc-MIBI accumulation in these organs. Furthermore, the histopathological findings confirmed the biodistribution results. These results demonstrate that although monotherapy with itraconazole or paclitaxel has anti-tumor activity against HT-29 human colorectal cancer, a synergistic anti-tumor activity can be achieved when itraconazole is co-administered with paclitaxel. Also, 99mTc-MIBI is an effective radiotracer for monitoring response to treatment in MDR tumors.
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Affiliation(s)
- Mahdi Ghadi
- Department of Radiopharmacy, Faculty of Pharmacy, Pharmaceutical Sciences Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Seyed Jalal Hosseinimehr
- Department of Radiopharmacy, Faculty of Pharmacy, Pharmaceutical Sciences Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Fereshteh Talebpour Amiri
- Department of Anatomy, Faculty of Medicine, Molecular and Cell Biology Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Alireza Mardanshahi
- Department of Radiology, Faculty of Medicine, Cardiovascular Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Zohreh Noaparast
- Department of Radiopharmacy, Faculty of Pharmacy, Pharmaceutical Sciences Research Center, Mazandaran University of Medical Sciences, Sari, Iran.
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Sood A, Singh D, Dutta U, Mittal BR, Parmar M, Kaur G, Kaur K. Effect of ursodeoxycholic acid in facilitating early hepatic clearance of radiotracer among patients undergoing 99mTc-sestamibi myocardial perfusion scintigraphy: A randomized double blind placebo controlled parallel trial. J Nucl Cardiol 2020; 27:2337-2348. [PMID: 30697661 DOI: 10.1007/s12350-019-01597-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 12/27/2018] [Indexed: 10/27/2022]
Abstract
BACKGROUND Infra-cardiac tracer activity due to persistent hepatic activity interferes in inferior and infero-septal wall assessment during 99mTc-MIBI SPECT/CT myocardial perfusion scintigraphy (MPS) in evaluation of patients with coronary artery disease. It affects image interpretation with increased study duration. Ursodeoxycholic acid (UDCA) is known to enhance hepatic excretion of bilirubin and bile salts, though its role in enhancing the hepatic tracer clearance in facilitating cardiac imaging is not known. METHODS This prospective, randomized double-blind, placebo controlled clinical trial of 120 patients, referred for adenosine stress or viability MPS studies were randomized 1:1 to receive either UDCA or placebo. Outcome was quantitative & qualitative improvement in imaging for better interpretation and to reduce the waiting time for scan. RESULTS 118 participants (59 ± 11.9 years; 84 men) underwent adenosine stress MPS or viability MPS. Sixty participants had UDCA while 58 had placebo intervention. The study showed significant decrease in liver counts with improved myocardial to liver ratio at 30 and 60 minutes in adenosine stress MPS group, and marginally significant alteration in liver counts at 60 minutes in viability MPS group receiving UDCA, resulting in better images. CONCLUSION UDCA intervention in MPS provides early and better image due to faster hepatic tracer clearance.
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Affiliation(s)
- Ashwani Sood
- Post Graduate Institute of Medical Education and Research (PGIMER), Nuclear Medicine, Chandigarh, India
| | - Deepa Singh
- Post Graduate Institute of Medical Education and Research (PGIMER), Nuclear Medicine, Chandigarh, India
| | - Usha Dutta
- Post Graduate Institute of Medical Education and Research (PGIMER), Gastroenterology, Chandigarh, India
| | - Bhagwant Rai Mittal
- Post Graduate Institute of Medical Education and Research (PGIMER), Nuclear Medicine, Chandigarh, India.
| | - Madan Parmar
- Post Graduate Institute of Medical Education and Research (PGIMER), Nuclear Medicine, Chandigarh, India
| | - Gurvinder Kaur
- Post Graduate Institute of Medical Education and Research (PGIMER), Nuclear Medicine, Chandigarh, India
| | - Komalpreet Kaur
- Post Graduate Institute of Medical Education and Research (PGIMER), Nuclear Medicine, Chandigarh, India
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Mohammadinia S, Abedi SM, Noaparast Z. St. John’s Wort accelerates the liver clearance of technetium-99-sestamibi in rats. Nucl Med Commun 2018; 39:839-844. [DOI: 10.1097/mnm.0000000000000880] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Phenytoin Could Potentially Increase Hepatic Clearance of 99mTc-Sestamibi in Myocardial Perfusion Imaging. Clin Nucl Med 2018; 43:e341-e342. [PMID: 30080190 DOI: 10.1097/rlu.0000000000002199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Myocardial perfusion imaging (MPI) is one of the most commonly used nuclear medicine imaging modalities for coronary artery disease evaluation and risk stratification. The authors present incidental image findings in a patient who underwent MPI twice because of development of seizures just before the first SPECT-MPI acquisition. The projection images for first MPI done without medication (phenytoin) showed the retention of hepatic tracer activity. After a few days from restarting of phenytoin, the repeat MPI showed complete hepatic clearance of tracer. This case highlights the possible pharmacokinetic interaction between phenytoin intake and Tc-sestamibi, resulting in faster hepatic clearance of the radiotracer.
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Territo PR, Maluccio M, Riley AA, McCarthy BP, Fletcher J, Tann M, Saxena R, Skill NJ. Evaluation of 11C-acetate and 18F-FDG PET/CT in mouse multidrug resistance gene-2 deficient mouse model of hepatocellular carcinoma. BMC Med Imaging 2015; 15:15. [PMID: 25981587 PMCID: PMC4493966 DOI: 10.1186/s12880-015-0058-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2014] [Accepted: 05/08/2015] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Hepatocellular carcinoma (HCC) remains a global health problem with unique diagnostic and therapeutic challenges, including difficulties in identifying the highest risk patients. Previous work from our lab has established the murine multidrug resistance-2 mouse (MDR2) model of HCC as a reasonable preclinical model that parallels the changes seen in human inflammatory associated HCC. The purpose of this study is to evaluate modalities of PET/CT in MDR2(-/-) mice in order to facilitate therapeutic translational studies from bench to bedside. METHODS 18F-FDG and 11C-acetate PET/CT was performed on 12 m MDR2(-/-) mice (n = 3/tracer) with HCC and 12 m MDR2(-/+) control mice (n = 3/tracer) without HCC. To compare PET/CT to biological markers of HCC and cellular function, serum alpha-fetoprotein (AFP), lysophosphatidic acid (LPA), cAMP and hepatic tumor necrosis factor α (TNFα) were quantified in 3-12 m MDR2(-/-) (n = 10) mice using commercially available ELISA analysis. To translate results in mice to patients 11C-acetate PET/CT was also performed in 8 patents suspected of HCC recurrence following treatment and currently on the liver transplant wait list. RESULTS Hepatic18F-FDG metabolism was not significantly increased in MDR2(-/-) mice. In contrast, hepatic 11C-acetate metabolism was significantly elevated in MDR2(-/-) mice when compared to MDR2(-/+) controls. Serum AFP and LPA levels increased in MDR2(-/-) mice contemporaneous with the emergence of HCC. This was accompanied by a significant decrease in serum cAMP levels and an increase in hepatic TNFα. In patients suspected of HCC recurrence there were 5 true positives, 2 true negatives and 1 suspected false 11C-acetate negative. CONCLUSIONS Hepatic 11C-acetate PET/CT tracks well with HCC in MDR2(-/-) mice and patients with underlying liver disease. Consequently 11C-acetate PET/CT is well suited to study (1) HCC emergence/progression in patients and (2) reduce animal numbers required to study new chemotherapeutics in murine models of HCC.
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Affiliation(s)
- Paul R Territo
- Department of Surgery, Radiology and Imaging Sciences, Indianapolis, IN, 46202, USA.
| | - Mary Maluccio
- Department of Surgery, Indiana University School of Medicine, C519 Walthur Cancer Research Building (R3), 980 W Walnut Street, Indianapolis, IN, 46077, USA.
| | - Amanda A Riley
- Department of Surgery, Radiology and Imaging Sciences, Indianapolis, IN, 46202, USA.
| | - Brian P McCarthy
- Department of Surgery, Radiology and Imaging Sciences, Indianapolis, IN, 46202, USA.
| | - James Fletcher
- Department of Surgery, Radiology and Imaging Sciences, Indianapolis, IN, 46202, USA.
| | - Mark Tann
- Department of Surgery, Radiology and Imaging Sciences, Indianapolis, IN, 46202, USA.
| | - Romil Saxena
- Department of Surgery, Radiology and Imaging Sciences, Indianapolis, IN, 46202, USA.
| | - Nicholas J Skill
- Department of Surgery, Indiana University School of Medicine, C519 Walthur Cancer Research Building (R3), 980 W Walnut Street, Indianapolis, IN, 46077, USA.
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Abstract
Primary intrinsic and/or acquired multidrug resistance (MDR) is the main obstacle to successful cancer treatment. Functional molecular imaging of MDR in cancer using single photon or positron emitters may be helpful to identify multidrug-resistant tumours and predict not only those patients who are resistant to treatment, with a clinically unfavourable prognosis, but also those who are susceptible to the development of drug toxicity or even certain tumours . Variations in the mdr1 gene product may directly affect the therapeutic effectiveness, and single nucleotide polymorphisms for the mdr1 gene may be associated with altered oral bioavailability of MDR1 substrates, drug resistance, and a susceptibility to some human diseases. The challenge of translating the concept of MDR modulation in vivo involves a complex cellular interplay between both malignant and normal cells. Integration and correlation of functional single photon emission tomography or positron emission tomography imaging findings with mdr1 genotype and clinical data may contribute to efficient management by selecting cancer patients with the appropriate molecular phenotype for maximal individual therapeutic benefit, as well as those who are non-responders. This review describes a role for functional imaging of classical mechanisms of MDR with an emphasis on readily available [99mTc]MIBI scintigraphy. MIBI scintigraphy has been shown to be a non-invasive cost-effective in vivo assay of ATP-binding cassette transporters associated with MDR in cancer, including P-glycoprotein, multidrug-resistant protein 1 and breast cancer resistant protein. New imaging agents for molecular targets such as vascular endothelial growth factor and HER2 receptors, may potentially be combined with MDR imaging substrates to more accurately predict the therapeutic response to anticancer drugs, guiding individualised treatment while minimising the economic health costs of ineffective therapy in an era of personalised medicine.
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Affiliation(s)
- S Dizdarevic
- Department of Nuclear Medicine, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK.
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Bhargava KK, Joseph B, Ananthanarayanan M, Balasubramaniyan N, Tronco GG, Palestro CJ, Gupta S. Adenosine triphosphate-binding cassette subfamily C member 2 is the major transporter of the hepatobiliary imaging agent (99m)Tc-mebrofenin. J Nucl Med 2009; 50:1140-6. [PMID: 19525466 DOI: 10.2967/jnumed.109.062448] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
UNLABELLED The organic anion (99m)Tc-N-[2-[(3-bromo-2,4,6-trimethylphenyl)-amino]-2-oxoethyl]-N-(carboxymethyl)-glycine ((99m)Tc-mebrofenin) and its analogs are widely used for hepatobiliary imaging. Identification of the mechanisms directing bile canalicular transport of these agents will provide insights into the basis of their hepatic handling for assessing perturbations. METHODS We performed studies in animals, including healthy Fischer 344 rats or rats treated with carbon tetrachloride or intrasplenic cell transplantation and healthy Wistar rats or HsdAMC:TR-Abcc2 mutant rats in Wistar background. Onset of hepatic inflammation was verified by analysis of carbon uptake in Kupffer cells. Hepatic clearance of (99m)Tc-mebrofenin was studied with dynamic imaging, and fractional retention of peak hepatic mebrofenin activity after 60 min was determined. Changes in the expression of bile canalicular transporters were analyzed by real-time polymerase chain reaction and Western blots. RESULTS Carbon tetrachloride and cell transplantation produced hepatic inflammation with activation of Kupffer cells, resulting in a rapid decline in the expression of the bile canalicular transporters Abcb4, Abcb11, and Abcc2. Among these transporters, decreased expression of Abcc2 was most prominent, and this decline persisted for 4 wk. Next, we examined (99m)Tc-mebrofenin excretion in HsdAMC:TR-Abcc2 mutant rats (in which Abcc2 expression is naturally inactivated), compared with their healthy counterparts. In healthy HsdRccHan:WIST rats, only 23% +/- 3% of the peak (99m)Tc-mebrofenin activity was retained after 60 min. By contrast, in HsdAMC:TR-Abcc2 mutant rats, 73% +/- 5% of the peak (99m)Tc-mebrofenin activity was retained (P < 0.001). Moreover, the administration of cyclosporin A markedly inhibited (99m)Tc-mebrofenin excretion in healthy rats, with no further effect on already impaired (99m)Tc-mebrofenin excretion in HsdAMC:TR-Abcc2 mutant rats. Hepatic excretion of (99m)Tc-mebrofenin was largely dependent on Abcc2. This molecular basis of (99m)Tc-mebrofenin excretion will advance studies of pathophysiologic mechanisms in hepatic Abcc2 pathways.
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Affiliation(s)
- Kuldeep K Bhargava
- Division of Nuclear Medicine and Molecular Imaging, North Shore-Long Island Health System, New Hyde Park, New York, USA
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Blanckaert P, Burvenich I, Staelens S, De Bruyne S, Moerman L, Wyffels L, De Vos F. Effect of cyclosporin A administration on the biodistribution and multipinhole μSPECT imaging of [123I]R91150 in rodent brain. Eur J Nucl Med Mol Imaging 2008; 36:446-53. [DOI: 10.1007/s00259-008-0968-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2008] [Accepted: 09/21/2008] [Indexed: 11/28/2022]
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Systemic and local release of inflammatory cytokines regulates hepatobiliary excretion of 99mTc-mebrofenin. Nucl Med Commun 2008; 29:336-44. [PMID: 18317297 DOI: 10.1097/mnm.0b013e3282f81460] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES Imaging agents capable of providing cell compartment-specific information will facilitate studies of pathophysiological mechanisms, natural history of diseases, and therapeutic development. To demonstrate the effects of liver injury on the disposal of the organic anion mebrofenin, we performed animal studies. METHODS Acute liver injury was induced in Fischer 344 rats with 0.25-1 ml/kg single doses of carbon tetrachloride followed by studies of animals over 4 weeks. The liver injury was analyzed by blood tests and histological grading. Additional rats were treated with lipopolysaccharide, interleukin-6 or tumor necrosis factor-alpha to activate inflammatory events. Hepatic clearance of Tc-mebrofenin was studied with dynamic imaging and fractional retention after 60 min of peak hepatic mebrofenin activity was determined. RESULTS In healthy rats, only 24+/-2% of peak mebrofenin activity was retained in the liver after 60 min. By contrast, 24 h after carbon tetrachloride, virtually all mebrofenin activity was retained in the liver (P<0.001). Three weeks were required for mebrofenin excretion to become normal after carbon tetrachloride administration. In this situation, we found that Kupffer cell activity was increased. In addition, the abnormality in mebrofenin excretion was reproduced by lipopolysaccharide, which activates Kupffer cells. Moreover, mebrofenin excretion was highly sensitive to interleukin-6 and/or tumor necrosis factor-alpha, which help mediate the Kupffer cell response. CONCLUSION Hepatobiliary excretion of mebrofenin was affected rapidly and over an extended period by inflammatory cytokines released after liver injury. The remarkable sensitivity of mebrofenin excretion to cytokines suggests that Tc-mebrofenin imaging will be helpful for assessing cytokine-mediated liver inflammation.
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Wauthier E, Schmelzer E, Turner W, Zhang L, LeCluyse E, Ruiz J, Turner R, Furth M, Kubota H, Lozoya O, Barbier C, McClelland R, Yao H, Moss N, Bruce A, Ludlow J, Reid L. Hepatic Stem Cells and Hepatoblasts: Identification, Isolation, and Ex Vivo Maintenance. Methods Cell Biol 2008; 86:137-225. [DOI: 10.1016/s0091-679x(08)00008-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Barai S, Bandopadhayaya GP, Pant GS, Haloi AK, Malhotra A, Dhanpathi H. Thallium-201 versus Tc99m-glucoheptonate SPECT for evaluation of recurrent brain tumours: a within-subject comparison with pathological correlation. J Clin Neurosci 2006; 12:27-31. [PMID: 16568553 DOI: 10.1016/j.jocn.2004.01.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Thallium-201 (Tl-201) is the most commonly used tracer for functional imaging of recurrent brain tumours. However, the physical properties of Tl-201 are not particularly suitable for this application, thus, a technetium-99 (Tc99m) labelled alternative with more favourable physical properties has been sought. The aim of this study was to compare the ability of Tl-201 and Tc99m-glucoheptonate single photon emission computed tomography (SPECT) to detect viable recurrent tumour and differentiate post-radiation gliosis. METHOD Brain SPECT with Tl-201 and Tc99m-glucoheptonate was performed in 20 patients with malignant brain tumour in whom recurrent disease was suspected. Tracer uptake in the mass was defined as high, moderate or low and was correlated with histological verification of the lesion in all cases. RESULTS Recurrent tumour was demonstrated in 17 patients by both Tl-201 and Tc99m-glucoheptonate SPECT and confirmed by surgical resection in all 17 patients. Three patients had no tracer uptake on either Tl-210 or Tc99m-glucoheptonate SPECT and surgical resection revealed only fibrotic tissue with areas of necrosis. Tc99m-glucoheptonate images were found to correlate more closely with the surgical findings with regard to the location of tumour margin, extent of tumour invasion and intratumoural necrosis. CONCLUSION Tc99m-glucoheptonate brain SPECT is an accurate agent for SPECT imaging of recurrent brain tumours and may provide more information about the location of the tumour margin and its extent and intratumoural necrosis than Tl-201. Tc99m-glucoheptonate may be a viable replacement for Tl-201.
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Affiliation(s)
- S Barai
- Department of Nuclear Medicine, All India Institute of Medical Sciences, New Delhi.
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Gould KL, Taegtmeyer H. Myocardial Ischemia, Fluorodeoxyglucose, and Severity of Coronary Artery Stenosis: The Complexities of Metabolic Remodeling in Hibernating Myocardium. Circulation 2004; 109:e167-70; author reply e167-70. [PMID: 15051653 DOI: 10.1161/01.cir.0000123021.19837.40] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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