- 行业: Government; Health care
- Number of terms: 6957
- Number of blossaries: 0
- Company Profile:
The National Cancer Institute (NCI) is part of the National Institutes of Health (NIH), which is one of 11 agencies that compose the Department of Health and Human Services (HHS). The NCI, established under the National Cancer Institute Act of 1937, is the Federal Government's principal agency for ...
A radiopharmaceutical consisting of ethylenedicysteine-deoxyglucose (EC-DG) labeled with the metastable radioisotope technetium Tc-99 (99mTc). Upon administration, technetium Tc 99m ethylenedicysteine-deoxyglucose accumulates in cells with increased metabolic activity such as proliferating tumor cells; tumor tissue may then be imaged using gamma scintigraphy.
Industry:Pharmaceutical
A radiopharmaceutical consisting of the sodium salt of fluorine F 18 fluoride with radioisotopic and bone mineralizing activities. Fluoride binds to calcium ions in hydroxyapatite crystals in bone. The uptake and incorporation of positron-emitting fluorine F 18 fluoride into bone can be imaged using positron emission tomography (PET) or single-photon emission computed tomography (SPECT), allowing visualization of malignant bone lesions in which regional blood flow and bone turnover are increased.
Industry:Pharmaceutical
A radiopharmaceutical containing an analogue of tryptophan, alpha-methyltryptophan (AMT), labeled with carbon 11 (11C), used to measure serotonin synthesis in the human brain using positron emission tomography (PET). Upon administration and once it crosses the blood-brain barrier and into the cytoplasm of serotonergic neurons, carbon C 11 alpha-methyltryptophan acts as a substrate for the enzyme tryptophan hydroxylase and undergoes conversion to carbon C 11 alpha-methyl-5-hydroxytryptophan, also known as C 11 alpha-methyl-serotonin (AMS). C 11 AMS accumulates in serotonergic nerve terminals in proportion to the synthesis rate of serotonin because C 11 AMS cannot be broken down by the enzyme monoamine oxidase, and thus the synthesis rate of serotonin can be imaged using PET. C 11 AMT is not incorporated into proteins, nor are metabolites released into the blood pool, making C 11 AMT an excellent tracer for serotonin synthesis in vivo.
Industry:Pharmaceutical
A radiopharmaceutical containing N-desmethyl loperamide (dLop) labeled with carbon 11 (11C), used to measure the activity of efflux transporter P-glycoprotein (P-gp) in positron emission tomography (PET). Upon administration, carbon C 11 N-desmethyl-loperamide acts as a substrate for the efflux transporter P-gp. Upon uptake by P-gp at the blood-brain barrier (BBB) and subsequent PET imaging, this radioligand may allow for prediction of P-gp function and expression in brain tumor patients. As P-gp activity may influence response to therapy, measuring P-gp activity may be beneficial when choosing chemotherapy. P-gp, encoded by the MDR-1 gene and a member of the ATP-binding cassette (ABC) superfamily of transmembrane transporters, is overexpressed by some MDR tumors and may contribute to multidrug resistance to chemotherapy.
Industry:Pharmaceutical
A radiopharmaceutical containing the dopamine D2/D3 receptor agonist iodobenzamide (IBZM) labeled with the radionuclide iodine I 123 with dopamine receptor-binding and radioisotopic activities. Upon administration, iodine I 123 iodobenzamide binds to dopamine D2/D3 receptors; subsequently, tissues expressing these receptors can be visualized using single photon emission computed tomography (SPECT). Dopamine receptors are a class of metabotropic G protein-coupled receptors found in the central nervous system (CNS) and neuroendocrine tumors such as pheochromocytoma and paraganglioma.
Industry:Pharmaceutical
A radiopharmaceutical containing the serotonin transporter (SERT) ligand ADAM (2-((2-((dimethylamino)methyl)phenyl)thio)-5-iodophenylamine) labeled with the radioisotope iodine I 123, with SERT-binding and radioisotope activities. Upon administration, iodine I 123 ADAM selectively binds to SERT-expressing cells; subsequently, SERT-expressing tissues may be visualized using single photon emission computed tomography (SPECT). SERT is a monamine transporter protein found in the membranes of neurons and platelets; in neurons it transports the neurotransmitter serotonin from synaptic spaces into presynaptic neurons, terminating serotonin's function.
Industry:Pharmaceutical
A radiopharmaceutical core of chelating agent DTPA (diethylenetriaminepentaacetic acid) complexed with the gamma-emitting radionuclide technetium Tc 99m with radioimaging application. Tc-99m-DTPA has been utilized as a radiotracer, when conjugated to tissue specific molecules, in a wide variety of nuclear imaging studies, including brain, lung, and renal function studies.
Industry:Pharmaceutical
A radio-sensitizing pyrimidine nucleoside with potential antineoplastic activity. Cytochlor is metabolized first to a phosphate derivative, CldCMP, by the enzyme deoxycytidine kinase and then to the active uracyl derivative, CldUMP, by the enzyme dCMP deaminase; deoxycytidine kinase and dCMP deaminase have been found in abnormally high concentrations in most cancers. CldUMP, the active metabolite, incorporates into DNA and, upon exposure to radiation, induces the formation of uracil radicals and double-strand DNA breaks.
Industry:Pharmaceutical
A radiotracer consisting of choline labeled with the positron-emitting isotope carbon C 11 with potential imaging use. Upon administration, C-11 choline incorporates into tumor cells through an active, carrier-mediated transport mechanism for choline and then is phosphorylated intracellularly by choline kinase, an enzyme frequently upregulated in human tumors, yielding phosphoryl C-11 choline. In turn, phosphoryl C-11 choline is integrated into phospholipids in the cell membrane as part of phosphatidylcholine. As the proliferation of cancer cells is much higher than normal cells, tumor cells exhibit an increased rate of C-11 choline uptake and incorporation, allowing tunor imaging with positron emission tomography (PET).
Industry:Pharmaceutical
A radiotracer consisting of methylcholine labeled with the positron-emitting radioisotope fluorine F 18 (18F-FMCH) with potential imaging use. Upon administration, 18F-fluoromethylcholine incorporates into tumor cells through an active, carrier-mediated transport mechanism for choline and then is phosphorylated intracellularly by choline kinase, an enzyme frequently upregulated in human tumors, yielding phosphoryl 18F-fluoromethylcholine. In turn, phosphoryl 18F-fluoromethylcholine is integrated into phospholipids in the cell membrane as part of phosphatidylcholine. As the proliferation of cancer cells is much higher than normal cells, tumor cells exhibit an increased rate of 18F-FMCH uptake and incorporation, allowing tumor imaging with positron emission tomography (PET).
Industry:Pharmaceutical
