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Journal of Cell Science, Vol 103, Issue 1 267-271, Copyright © 1992 by Company of Biologists
JOURNAL ARTICLES |
J Clover, RA Dodds and M Gowen
Bone Research Unit, Bath Institute for Rheumatic Diseases, UK.
The extracellular matrix may be considered as an insoluble local mediator which plays an important role in regulating cell function. Communication between the cell and its matrix occurs via the integrins, a family of transmembrane proteins composed of non-covalently linked alpha and beta subunits. The aim of this study was to establish which integrins are present on human bone cells in situ and in culture, using cryostat sections of undecalcified human bone, osteoclastoma tissue and cultured human osteoblasts. Integrin subunit expression was identified indirectly using alkaline phosphatase anti-alkaline phosphatase conjugates and FITC-labelled secondary antibodies. Subunits expressed by cultured human osteoblast-like cells were then quantified by FACS analysis. Staining patterns observed in situ show that osteoblasts and osteoclasts possess different integrin subunits. Osteoblasts primarily express alpha 1, alpha 3 and beta 1 and weakly express alpha 2. Osteoclasts express alpha 2, alpha V, beta 1 and beta 3. Subunits alpha 4, alpha 5, alpha 6, alpha L, alpha M and beta 2 were not expressed by either of these cell types. Expression of beta 1 by all cells of the osteoblastic lineage was constitutive, but alpha 1 and alpha 3 subunits were expressed by osteoblasts actively synthesizing bone and some of the osteoblast lining cells. All integrin subunits identified on osteoblasts in situ were maintained on culture but there was an increased expression of alpha 2 and alpha V subunits were weakly positive. Expression of alpha 2, alpha 3, alpha V and beta 1 subunits was independent of cell density but expression of alpha 1 was much greater in confluent cultures.(ABSTRACT TRUNCATED AT 250 WORDS)
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