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• W2051257455 abstract "Different functions have been proposed for osteocytes over time, but it is now generally accepted that their most important task lies in the sensing of strain caused by mechanical loading on bone. The fact that mechanical strain can be sensed as deformation of the extracellular matrix or as fluid shear stress along the cell, in the space between cell membrane and extracellular matrix, requires that osteocytes have close (specialized) contact with the bone matrix. We studied to which extracellular matrix proteins isolated chicken osteocytes adhere and whether this adhesion is mediated by specific cell adhesion receptors called integrins. The adhesive properties of the osteocytes were compared with that of osteoblasts. Osteocytes (and osteoblasts) adhere to the same substrates (i.e., collagen types I and II, collagen fibers, osteopontin, osteonectin, fibronectin, fibrinogen, thrombospondin, and laminin). Cell spreading varied between substrates, from all cells rounded on thrombospondin to all cells fully spread out on osteopontin, osteonectin, vitronectin, fibronectin, fibrinogen, and laminin. The percentage of osteocytes adhered was equivalent to that of osteoblasts adhered on all substrates except osteopontin and vitronectin, where osteocytes adhered less. The adhesion of osteocytes and osteoblasts to osteopontin, osteonectin, vitronectin, and fibrinogen was strongly inhibited, and to fibronectin and laminin moderately, by an RGD peptide. No RGD inhibition was found on collagen. An antibody against chicken integrin alpha v beta 3, the monoclonal antibody (MAb) 23C6, did not interfere with the adhesion of osteocytes and osteoblasts to matrix proteins, whereas an MAb against chicken integrin subunit beta 1 (CSAT) strongly inhibited adhesion to all substrates. Labeling with osteocyte-specific MAbs (OB7.3, OB37.4, and OB37.11) also did not hinder the adhesion of osteocytes to collagen type I, vitronectin, and osteopontin. Adhesion sites on osteocytes were small compared with the large adhesion plaques of osteoblasts, as demonstrated by interference reflection microscopy and immunocytochemically by staining for vinculin. Osteocyte adhesion is analogous to osteoblast adhesion with regard to the range of extracellular matrix proteins to which they adhere. The adhesion is mediated by the integrin subunit beta 1, but other integrins or nonintegrin adhesion receptors are also involved. Osteocytes make contact with the extracellular matrix via small attachment points which colocalize with vinculin. This connection between the bone matrix and the cytoskeleton may be important for osteocytic sensing of mechanical strain, as it supplies a transduction route of extracellular (mechanical) signals into intracellular messages." @default.
• W2051257455 created "2016-06-24" @default.
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• W2051257455 date "1996-04-01" @default.
• W2051257455 modified "2023-10-09" @default.
• W2051257455 title "Adhesive properties of isolated chick osteocytes in vitro" @default.
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• W2051257455 doi "https://doi.org/10.1016/8756-3282(96)00010-5" @default.
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