1970
DOI: 10.1007/bf02196199
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The influence of pyrophosphate, condensed phosphates, phosphonates and other phosphate compounds on the dissolution of hydroxyapatitein vitro and on bone resorption induced by parathyroid hormone in tissue culture and in thyroparathyroidectomised rats

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Cited by 327 publications
(137 citation statements)
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“…They are chemically stable analogues of pyrophosphate, in which the central oxygen atom is replaced by carbon to form a P-C-P moiety; variations in the R1 and R2 side chains off the central carbon produce the individual bisphosphonates [104,106]. Like pyrophosphate, BPs bind strongly to bone mineral and inhibit the formation and propagation of hydroxyapatite crystals [107].…”
Section: Pyrophosphate and Bisphosphonatesmentioning
confidence: 99%
See 1 more Smart Citation
“…They are chemically stable analogues of pyrophosphate, in which the central oxygen atom is replaced by carbon to form a P-C-P moiety; variations in the R1 and R2 side chains off the central carbon produce the individual bisphosphonates [104,106]. Like pyrophosphate, BPs bind strongly to bone mineral and inhibit the formation and propagation of hydroxyapatite crystals [107].…”
Section: Pyrophosphate and Bisphosphonatesmentioning
confidence: 99%
“…Such events are very rare and their pathogenesis remains unclear. Claims that the similarities between pyrophosphate and BPs might explain these phenomena [110] are speculative and without scientific foundation, since pyrophosphate and polyphosphates do not inhibit bone resorption [106,111].…”
Section: Pyrophosphate and Bisphosphonatesmentioning
confidence: 99%
“…Both MV populations accumulate CPPD crystals in the presence of millimolar concentrations of ATP, whereas the HVF produces BCP crystals in the absence of ATP. In normal cartilage, ePPi prevents ePi binding to calcium in the ECM (10,11). Because AP displays a K m value for ePPi in the same range as that of E-NPPs for ATP (Table 2), higher AP activity could reduce the ePPi:ePi ratio and favor BCP crystal formation.…”
Section: Dysregulated Eppi/epi Production In Pathologymentioning
confidence: 99%
“…These vesicles have the unique ability to elaborate BCP and CPPD crystals from extracellular inorganic phosphate (ePi) and extracellular inorganic pyrophosphate (ePPi), respectively. The balance between ePi and ePPi must be tightly regulated, since ePPi prevents BCP crystal formation (10,11), while excess ePPi leads to CPPD crystal deposition (12,13).…”
Section: Introductionmentioning
confidence: 99%
“…O pirofosfato e os polifosfatos são incapazes de inibir a calcificação ectópica in vivo, quando administrados oralmente, devido à hidrólise do pirofosfato no trato gastrintestinal. Os BFs são análogos não-hidrolisáveis de pirofosfato, porque contêm ligações estáveis P-C-P no lugar de ligações lábeis P-O-P. Constituem-se, portanto, em compostos com as propriedades antidesmineralizantes do pirofosfato, mas resistentes à hidrólise 12 .A capacidade dos BFs em se ligar ao osso, prevenindo o crescimento e a dissolução de cristais, é maior quando R 1 = OH (etidronato) ao invés de Cl (clodronato) 12,15,16 . Embora a estrutura da cadeia lateral de R 2 seja a maior determinante de potência anti-reabsorção, ambos os grupos fosfonatos também são necessários para a atividade dos fármacos.…”
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