Repositioning Candidate Details
| Candidate ID: | R1233 |
| Source ID: | DB09139 |
| Source Type: | approved |
| Compound Type: | small molecule |
| Compound Name: | Technetium Tc-99m oxidronate |
| Synonyms: | 99mtc-HDP; Oxidronic acid 99mtc-complex; Technetium (99mTc) oxidronate; Technetium 99mtc oxidronate; Technetium Tc 99m oxidronate |
| Molecular Formula: | CH6O7P2Tc |
| SMILES: | [99Tc].OC(P(O)(O)=O)P(O)(O)=O |
| Structure: |
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| DrugBank Description: | Technetium Tc-99m oxidronate, also known as 99mTc-methylene diphosphonate, is a radiopharmaceutical agent. A radiopharmaceutical is defined as a medicinal formulation containing radioisotopes that are used in major clinical areas for diagnosis and/or therapy. The radiopharmaceuticals based on technetium-99m are widely used for diagnostic purposes because 99mTc has a versatile chemistry which allows it to produce an extense variety of complexes with specific characteristics. These complexes are formed by the binding of 99mTc to metal atoms of an organic molecule. The group oxidronate falls into the category of diphosphonates whose structure allows them to bind to calcium. Thus, technetium Tc-99m oxidronate is a powerful detection tool for abnormal osteogenesis by skeletal scintigraphy. It was developed by Mallinkrodt nuclear and FDA approved on February 18, 1981. |
| CAS Number: | 72945-61-0 |
| Molecular Weight: | 290.906 |
| DrugBank Indication: | Technetium Tc-99m oxidronate is indicated in adult and pediatric patients to be used in skeletal imaging for diagnosis of areas that can present altered osteogenesis. When administered intravenously, it is able to generate a clear image of the bones which allows the physician to diagnose any bone problem. It is important to point out that this drug has to be manipulated only under the service of a nuclear specialist. The approved indications for a bone scan are 1) visualization of tumor metastasis in bone, 2) osteomyelitis, 3) fracture, 4) stress fracture, 5) avascular necrosis, 6) osteoporosis and 7) prosthetic joint evaluation. From all the major indications, the detection of a metastatic disease is the most common because it presents a 95% of sensitivity and lesion detection can be done 6 months earlier than with X-ray studies. |
| DrugBank Pharmacology: | The technetium is generated in a molibdene generator. Technetium Tc-99m presents a reduction of gamma emission after 6 hours and it is considered a quasi-stable molecule. The visualization of bone lesions is possible since there is an altered uptake in areas of abnormal osteogenesis. The principal photon used for detection is the gamma-2 with an energy of 140.5 keV. Its use for bone examination should be performed 2 hours after initial injection with a recommended activity on the range of 370-740 MBq. |
| DrugBank MoA: | The exact mechanism for bone uptake of technetium Tc-99m oxidronate is unknown. The most accepted mechanism is the localization of 99m-Tc on the surface of hydroxyapatite crystals of bone by chemisorption. Chemisorption is explained as a type of adsorption that involves a chemical reaction between the surface and the adsorbate in which new strong interactions form electronic bonds at the adsorbent surface. The presented chemisorption are regulated by the blood flow and blood concentration because it restrains the delivery of the agent in the uptake sites. |
| Targets: | -- |
| Inclusion Criteria: | Indication associated |
| Strategy ID | Strategy | Synonyms | Related Targets | Related Drugs |
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| Diseases ID | DO ID | Disease Name | Definition | Class | |
|---|---|---|---|---|---|
| I11 | 5295 | Intestinal disease | A gastrointestinal system disease that is located_in the intestine. http://en.wikipedia.org/wiki/Human_gastrointestinal_tract | disease of anatomical entity/gastrointestinal system disease | Details |
| I15 | 1290 | Bone disease | A connective tissue disease that affects the structure or development of bone or causes an impairment of normal bone function. http://en.wikipedia.org/wiki/Bone_disease | disease of anatomical entity/ musculoskeletal system disease/connective tissue disease | Details |