Inhibition of hydroxyapatite crystal growth by bone proteoglycans and proteoglycan components

Biochemical and Biophysical Research Communications
Sarah G ReesGraham Embery

Abstract

The small leucine-rich proteoglycans (SLRPs) interact with hydroxyapatite (HAP) and have been demonstrated to be important modulators of mineralisation. In the present study we have examined the effect of bone SLRPs, purified bone glycosaminoglycan (GAG) chains and core proteins as well as commercial chondroitin 4-sulphate, chondroitin 6-sulphate and desulphated chondroitin on HAP crystal growth. Seeded HAP growth experiments revealed that addition of bone GAG chains resulted in almost complete inhibition of crystal growth (93%), with addition of core proteins and intact PGs resulting in 55 and 37% inhibition, respectively. In contrast, commercial chondroitin 4-sulphate was significantly less inhibitory compared with the bone SLRPs and components, yielding only a 6% reduction in HAP-induced crystal growth at the same concentration. Significantly, chondroitin 6-sulphate was found to be noninhibitory, whilst desulphated chondroitin was inhibitory to seeded HAP growth. The data indicate that direct adsorption of SLRPs to growth sites and their ability to bind calcium are significant determinants in the inhibitory process. In addition, PG/GAG chemistry and the conformation of the macromolecules in solution have also been shown to b...Continue Reading

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