Monday, January 15, 2007

Platelet Rich Plasma Inhibits Demineralized Bone Matrix

In the study outlined below, it is clear that PRP inhibits bone matrix formation. this is consistent with previous reports. Perhaps, PRP is not useful in enchondral ossification but may be helpful in membranous ossification. Further research is needed.

APEX PRP.com

J Bone Joint Surg Am. 2007 Jan;89(1):139-47. Links
Platelet-rich plasma inhibits demineralized bone matrix-induced bone formation in nude mice.Ranly DM, Lohmann CH, Andreacchio D, Boyan BD, Schwartz Z.

It is unclear whether platelet-rich plasma is a clinically effective adjunct to osteoinductive agents such as demineralized bone matrix. It contains platelet-derived growth factor (PDGF), which decreases osteoinduction by human demineralized bone matrix in nude-mouse muscle, suggesting that platelet-rich plasma may also have a negative impact. This study tested the hypothesis that platelet-rich plasma reduces demineralized bone matrix-induced bone formation and that this effect varies with donor-dependent differences in platelet-rich plasma and demineralized bone matrix. Compared with platelet-poor plasma, platelet-rich plasma preparations exhibited a fourfold increase in the platelet count, a fifteenfold increase in the amount of transforming growth factor-beta, a sixfold increase in the amount of PDGF-BB, a fivefold increase in the amount of PDGF-AA, and a twofold increase in the amount of PDGF-AB. Platelet-rich plasma decreased the osteoinductivity of demineralized bone matrix implanted in immunocom-promised mice, and the activities of both demineralized bone matrix and platelet-rich plasma were donor-dependent. CLINICAL RELEVANCE: Platelet-rich plasma may not be an appropriate adjunct to demineralized bone matrix in some clinical applications.

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