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Comparative evaluation of three diphosphonates: in vitro adsorption (C- 14 labeled) and in vivo osteogenic uptake (Tc-99m complexed). 1980

M D Francis, and D L Ferguson, and A J Tofe, and J A Bevan, and S E Michaels

We have investigated the in vitro adsorption of three C-14-labeled diphosphonates on calcium phosphate. The three are 1-hydroxy[1-14C]ethylidene diphosphonate (C-14 HEDP), [14C]methylenediphosphonate (C-14 MDP), and hydroxy[14C]methylenediphosphonate (C-14 HMDP). All three adsorbed significantly more, per mole of calcium, on amorphous calcium phosphate than on crystalline hydroxyapatite. Among the three diphosphonates, C-14 HMDP adsorbed--on both amorphous and crystalline calcium phosphate--to a greater degree than did the other two bone-seeking agents. Moreover, when HMDP was complexed with Sn(II) and Tc-99m, it produced a significantly higher uptake of Tc-99m, per mg of calcium, in an isolated in vivo site of osteogenesis. The mechanisms of adsorption are discussed relative to the hydroxyl group on the diphosphonate, to the solubility of the calcium salts to the diphosphonates, and to the form of the calcium phosphate. These studies form a working rationale for the clinically observed high contrast obtained with Tc-99m HMDP between normal bone and soft tissue, and between normal and abnormal bone.

UI MeSH Term Description Entries
D010012 Osteogenesis The process of bone formation. Histogenesis of bone including ossification. Bone Formation,Ossification, Physiologic,Endochondral Ossification,Ossification,Ossification, Physiological,Osteoclastogenesis,Physiologic Ossification,Endochondral Ossifications,Ossification, Endochondral,Ossifications,Ossifications, Endochondral,Osteoclastogeneses,Physiological Ossification
D011877 Radionuclide Imaging The production of an image obtained by cameras that detect the radioactive emissions of an injected radionuclide as it has distributed differentially throughout tissues in the body. The image obtained from a moving detector is called a scan, while the image obtained from a stationary camera device is called a scintiphotograph. Gamma Camera Imaging,Radioisotope Scanning,Scanning, Radioisotope,Scintigraphy,Scintiphotography,Imaging, Gamma Camera,Imaging, Radionuclide
D001842 Bone and Bones A specialized CONNECTIVE TISSUE that is the main constituent of the SKELETON. The principal cellular component of bone is comprised of OSTEOBLASTS; OSTEOCYTES; and OSTEOCLASTS, while FIBRILLAR COLLAGENS and hydroxyapatite crystals form the BONE MATRIX. Bone Tissue,Bone and Bone,Bone,Bones,Bones and Bone,Bones and Bone Tissue,Bony Apophyses,Bony Apophysis,Condyle,Apophyses, Bony,Apophysis, Bony,Bone Tissues,Condyles,Tissue, Bone,Tissues, Bone
D002130 Calcium Phosphates Calcium salts of phosphoric acid. These compounds are frequently used as calcium supplements. Phosphates, Calcium
D002621 Chemistry A basic science concerned with the composition, structure, and properties of matter; and the reactions that occur between substances and the associated energy exchange.
D004164 Diphosphonates Organic compounds which contain P-C-P bonds, where P stands for phosphonates or phosphonic acids. These compounds affect calcium metabolism. They inhibit ectopic calcification and slow down bone resorption and bone turnover. Technetium complexes of diphosphonates have been used successfully as bone scanning agents. Bisphosphonate,Bisphosphonates
D006882 Hydroxyapatites A group of compounds with the general formula M10(PO4)6(OH)2, where M is barium, strontium, or calcium. The compounds are the principal mineral in phosphorite deposits, biological tissue, human bones, and teeth. They are also used as an anticaking agent and polymer catalysts. (Grant & Hackh's Chemical Dictionary, 5th ed) Hydroxyapatite Derivatives,Derivatives, Hydroxyapatite
D000327 Adsorption The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces as well. ABSORPTION into the substance may follow but not necessarily. Adsorptions
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012968 Etidronic Acid A diphosphonate which affects calcium metabolism. It inhibits ectopic calcification and slows down bone resorption and bone turnover. EHDP,Ethanehydroxydiphosphonate,Etidronate,Etidronate Disodium,Sodium Etidronate,(1-hydroxyethylene)diphosphonic acid,(1-hydroxyethylene)diphosphonic acid, Tetrapotassium Salt,1,1-hydroxyethylenediphosphonate,1-Hydroxyethane-1,1-Diphosphonate,1-Hydroxyethylidene-1,1-Bisphosphonate,Dicalcium EHDP,Dicalcium Etidronate,Didronel,Disodium 1-Hydroxyethylene Diphosphonate,Disodium Etidronate,Ethanehydroxyphosphate,Etidronate, Tetrapotassium Salt,HEDP,HEDSPA,Hydroxyethanediphosphonate,Hydroxyethylidene Diphosphonic Acid,Phosphonic acid, (1-hydroxyethylidene)bis-, disodium salt,Xidifon,Xidiphon,Xydiphone,1 Hydroxyethane 1,1 Diphosphonate,1 Hydroxyethylidene 1,1 Bisphosphonate,1,1 hydroxyethylenediphosphonate,1-Hydroxyethylene Diphosphonate, Disodium,Diphosphonate, Disodium 1-Hydroxyethylene,Diphosphonic Acid, Hydroxyethylidene,Disodium 1 Hydroxyethylene Diphosphonate,EHDP, Dicalcium,Etidronate, Dicalcium,Etidronate, Disodium,Etidronate, Sodium,Salt Etidronate, Tetrapotassium,Tetrapotassium Salt Etidronate

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