Expression of functional folate receptors by human parathyroid cells
| Autor: | Francois Villinger, Jyotirmay Sharma, Raghuveer Halkar, Praveen K. Amancha, Kereen Gordon, Susan Muller, Philip S. Low, Roger Schibli, Cristina Müller, Malgorzata Lipowska, Vernon M. Camp, Susan A. Safley, Christopher P. Leamon, Collin J. Weber |
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| Rok vydání: | 2013 |
| Předmět: |
medicine.medical_specialty
Thyroid Gland Gene Expression CHO Cells Biology Jurkat cells KB Cells Cell Line HeLa Parathyroid Glands Jurkat Cells Cricetulus Folic Acid Internal medicine Gene expression medicine Animals Humans Folate Receptor 1 Folate Receptor 2 RNA Messenger RNA Neoplasm Thyroid Neoplasms Receptor Radionuclide Imaging A549 cell Thyroid Organotechnetium Compounds biology.organism_classification Molecular biology medicine.anatomical_structure Endocrinology Parathyroid Neoplasms Cell culture Immunohistochemistry Surgery Radiopharmaceuticals HeLa Cells |
| Zdroj: | Surgery. 154(6) |
| ISSN: | 1532-7361 |
| Popis: | Background Human pituitary adenomas express folate receptors (FR); therefore, we hypothesized that parathyroid (PT) tumors also might express FR, whereas normal human thyroids might not. The purpose of our study was to characterize the functionality of FRs on human PT tumors, with the goal of developing an imaging tool that would concentrate in PT more than in the thyroid. Methods Human PTs and thyroids were evaluated for FR expression by immunohistochemistry. Expression of genes for FRα and FRβ was measured with the Illumina Human HT-12 Expression Bead Chips and verified by quantitative reverse-transcription polymerase chain reaction. Folate incorporation by PT cells versus normal thyroid cells was determined by incubation with 99m Technetium ( 99m Tc)(CO) 3 -folate and 99m Tc-Etarfolatide, and uptake was determined by gamma counting. Specific targeting of FRs was demonstrated by blocking with cold folate. A549 cells and Jurkat cells served as FR-negative controls, and KB cells and HeLa cells were FR-positive controls. Results On immunohistochemistry and Western blotting, human PT cells expressed FRs, whereas human thyroid cells did not. The FRα gene was expressed in all PTs analyzed, and the FRβ gene was expressed by most. Uptake of 99m Tc(CO) 3 -folate was increased in PT cells versus thyroid cells. There was dose-dependent uptake of 99m Tc-etarfolatide, and uptake was inhibited by preincubation with cold folate, confirming FR-mediated binding. Conclusion This is the first report of the expression and functionality of FRs on human PT cells. These findings suggest that 99m Tc-folate holds potential for localization of PT tumors preoperatively and their treatment. |
| Databáze: | OpenAIRE |
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