Cytokines and cell signalling in the periodontium

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Abstract
A large number of potential regulatory mechanisms have been described which may be involved in the control of cell function in the periodontium. In this review, soluble effector molecules which may regulate normal cell turnover and which may control the maintenance of the periodontal space are considered. There is evidence for the involvement of growth factors including EGF, PDGF, FGFs, IGF I & II and TGF-beta in these processes. The role of bone morphogenetic proteins (BMPs) in periodontal turnover is of considerable interest as they appear to be able to regulate all stages of this process from specifying cell commitment to regulating differentiated cell function. Empirical evidence suggests the importance of mechanical stimulation in controlling the maintenance of the periodontal ligament space. The wide range of effects of mechanical stimulation are briefly reviewed and the central role of prostaglandins is considered. Recent evidence suggests the involvement of nitric oxide (NO) in the regulation of mineralised tissue function, and the potential role of NO in maintenance of the ligament space is considered. Further studies are required which address the interactions between all of these mechanisms in order to determine the key factors which may control periodontal cell function. For the future an understanding of these interactions has the potential to lead to important clinical developments in periodontal and orthodontic therapy.

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